From a5b28962fdae523841b1e69e8d839557cfcd7810 Mon Sep 17 00:00:00 2001
Message-Id: <a5b28962fdae523841b1e69e8d839557cfcd7810.1608282196.git.mechanik20051988@gmail.com>
In-Reply-To: <cover.1608282196.git.mechanik20051988@gmail.com>
References: <cover.1608282196.git.mechanik20051988@gmail.com>
From: Aleksandr Lyapunov <alyapunov@tarantool.org>
Date: Tue, 10 Nov 2020 09:18:50 +0300
Subject: [PATCH 1/3] small: implement new size class evaluation
To: Vladislav Shpilevoy<v.shpilevoy@tarantool.org>
Cc: tarantool-patches@dev.tarantool.org

small_alloc uses a collection of mempools of different sizes.
If small_alloc stores all mempools in an array then it have to determine
an offset in that array where the most suitable mempool is.
Let's name the offset as 'size class' and the size that the corresponding
mempool allocates as 'class size'.
Historically the class sizes grow incrementally up to some point and then
(at some size class) grow exponentially with user-provided factor.
Apart from incremental part the exponential part is not very obvious.
Binary search and floating-point logarithm could be used for size class
determination but both approaches seem to be too slow.

This patch implements faster size class evaluation based on integral
operations.

Part of #5216
---
 CMakeLists.txt                     |    4 +
 LICENSE                            |    2 +-
 small/small_class.c                |   57 +
 small/small_class.h                |  220 +
 test/CMakeLists.txt                |    9 +
 test/small_class.c                 |  168 +
 test/small_class.result            | 9114 ++++++++++++++++++++++++++++
 test/small_class_branchless.result | 9114 ++++++++++++++++++++++++++++
 8 files changed, 18687 insertions(+), 1 deletion(-)
 create mode 100644 small/small_class.c
 create mode 100644 small/small_class.h
 create mode 100644 test/small_class.c
 create mode 100644 test/small_class.result
 create mode 100644 test/small_class_branchless.result

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4c575eb..d797128 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,6 +53,7 @@ set(lib_headers
     small/rlist.h
     small/slab_arena.h
     small/slab_cache.h
+    small/small_class.h
     small/small.h
     small/lsregion.h
     small/static.h)
@@ -63,6 +64,7 @@ set(lib_sources
     small/region.c
     small/mempool.c
     small/slab_arena.c
+    small/small_class.c
     small/small.c
     small/matras.c
     small/ibuf.c
@@ -71,6 +73,7 @@ set(lib_sources
     small/static.c)
 
 add_library(${PROJECT_NAME} STATIC ${lib_sources})
+target_link_libraries(${PROJECT_NAME} m)
 
 enable_testing()
 add_subdirectory(test)
@@ -87,6 +90,7 @@ if (NOT ENABLE_VALGRIND)
 endif()
 
 add_library(${PROJECT_NAME}_shared SHARED ${lib_sources})
+target_link_libraries(${PROJECT_NAME}_shared m)
 set_target_properties(${PROJECT_NAME}_shared PROPERTIES VERSION 1.0 SOVERSION 1)
 set_target_properties(${PROJECT_NAME}_shared PROPERTIES OUTPUT_NAME ${PROJECT_NAME})
 
diff --git a/LICENSE b/LICENSE
index d797c05..734ba6c 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright 2010-2016 Tarantool AUTHORS: please see AUTHORS file.
+Copyright 2010-2020 Tarantool AUTHORS: please see AUTHORS file.
 
 Redistribution and use in source and binary forms, with or
 without modification, are permitted provided that the following
diff --git a/small/small_class.c b/small/small_class.c
new file mode 100644
index 0000000..8f36d90
--- /dev/null
+++ b/small/small_class.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2010-2020, Tarantool AUTHORS, please see AUTHORS file.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above
+ *    copyright notice, this list of conditions and the
+ *    following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "small_class.h"
+#include <assert.h>
+#include <math.h>
+
+void
+small_class_create(struct small_class *sc, unsigned granularity,
+		   float desired_factor, unsigned min_alloc)
+{
+	assert(granularity > 0); /* size cannot be multiple of zero. */
+	assert((granularity & (granularity - 1)) == 0); /* must power of 2. */
+	assert(desired_factor > 1.f);
+	assert(desired_factor <= 2.f);
+	assert(min_alloc > 0); /* Cannot allocate zero. */
+
+	sc->granularity = granularity;
+	sc->rnd_bits = __builtin_ctz(granularity);
+	float log2 = logf(2);
+	sc->eff_bits = (unsigned)(logf(log2 / logf(desired_factor)) / log2 + .5);
+	sc->eff_size = 1u << sc->eff_bits;
+	sc->eff_mask = sc->eff_size - 1u;
+	sc->size_shift = min_alloc - granularity;
+	sc->size_shift_plus_1 = sc->size_shift + 1;
+
+	sc->requested_factor = desired_factor;
+	sc->actual_factor = powf(2, 1.f / powf(2, sc->eff_bits));
+}
diff --git a/small/small_class.h b/small/small_class.h
new file mode 100644
index 0000000..5d9ad5b
--- /dev/null
+++ b/small/small_class.h
@@ -0,0 +1,220 @@
+#ifndef TARANTOOL_SMALL_SMALL_CLASS_H_INCLUDED
+#define TARANTOOL_SMALL_SMALL_CLASS_H_INCLUDED
+/*
+ * Copyright 2010-2020, Tarantool AUTHORS, please see AUTHORS file.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above
+ *    copyright notice, this list of conditions and the
+ *    following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <limits.h> /* CHAR_BIT */
+
+/* {{{ Explanation */
+/*
+ * small_alloc uses a collection of mempools of different sizes.
+ * If small_alloc stores all mempools in an array then it have to determine
+ * an offset in that array where the most suitable mempool is.
+ * Let's name the offset as 'size class' and the size that the corresponding
+ * mempool allocates as 'class size'.
+ * Historically the class sizes grow incrementally up to some point and then
+ * (at some size class) grow exponentially with user-provided factor.
+ * Apart from incremental part the exponential part is not very obvious.
+ * Binary search and floating-point logarithm could be used for size class
+ * determination but both approaches seem to be too slow.
+ *
+ * This module is designed for faster size class determination.
+ * The idea is to use integral binary logarithm (bit search) and improve it
+ * in some way in order to increase precision - allow other logarithm bases
+ * along with 2.
+ * Binary integral logarithm is just a position of the most significant bit of
+ * a value. Let's look closer to binary representation of an allocation size
+ * and size class that is calculated as binary logarithm:
+ *       size      |  size class
+ *    00001????..  |      x
+ *    0001?????..  |    x + 1
+ *    001??????..  |    x + 2
+ * Let's take into account n lower bits just after the most significant
+ * in the value and divide size class into 2^n subclasses. For example if n = 2:
+ *       size      |  size class
+ *    0000100??..  |      x
+ *    0000101??..  |    x + 1
+ *    0000110??..  |    x + 2
+ *    0000111??..  |    x + 3
+ *    000100???..  |    x + 4  <- here the size doubles, in 4 = 2^n steps.
+ *    000101???..  |    x + 5
+ * That gives us some kind of approximation of a logarithm with a base equal
+ * to pow(2, 1 / pow(2, n)). That means that for given factor 'f' of exponent
+ * we can choose such a number of bits 'n' that gives us an approximation of
+ * an exponent that is close to 'f'.
+ *
+ * Of course if the most significant bit of a value is less than 'n' we can't
+ * use the formula above. But it's not a problem since we can (and even would
+ * like to!) use an incremental size class evaluation of those sizes.
+ *     size      |  size class
+ *    0000001    |      1  <- incremental growth.
+ *    0000010    |      2
+ *    0000011    |      3
+ *    0000100    |      4  <- here the exponential approximation starts.
+ *    0000101    |      5
+ *    0000110    |      6
+ *    0000111    |      7
+ *    000100?    |      8
+ *    000101?    |      9
+ *
+ * There's some implementation details. Size class is zero based, and the size
+ * must be rounded up to the closest class size. Even more, we want to round
+ * up size to some granularity, we doesn't want to have incremental pools of
+ * sizes 1, 2, 3.., we want them to be 8, 16, 24.... All that is achieved by
+ * subtracting size by one and omitting several lower bits of the size.
+ */
+/* }}} */
+
+#if defined(__cplusplus)
+extern "C" {
+#endif /* defined(__cplusplus) */
+
+struct small_class {
+	/** Every class size must be a multiple of this. */
+	unsigned granularity;
+	/** log2(granularity), ignore those number of the lowest bit of size. */
+	unsigned rnd_bits;
+	/**
+	 * A number of bits (after the most significant bit) that are used in
+	 * size class evaluation ('n' in the Explanation above).
+	 */
+	unsigned eff_bits;
+	/** 1u << eff_bits. */
+	unsigned eff_size;
+	/** eff_size - 1u. */
+	unsigned eff_mask;
+	/**
+	 * By default the lowest possible allocation size (aka class size of
+	 * class 0) is granularity. If a user wants different min_alloc, we
+	 * simply shift sizes; min_alloc = granularity + size_shift.
+	 */
+	unsigned size_shift;
+	/** Actually we need 'size_shift + 1', so store it. */
+	unsigned size_shift_plus_1;
+	/** Exponential factor that was requested upon small_class creation. */
+	float requested_factor;
+	/**
+	 * Exponential factor, approximation of which we managed to provide.
+	 * It is calculated from requested_factor, it's guaranteed that
+	 * it must be in range [requested_factor/k, requested_factor*k],
+	 * where k = pow(requested_factor, 0.5).
+	 */
+	float actual_factor;
+};
+
+/**
+ * Create an instance of small_class evaluator. All args must meet the
+ * requirements, undefined behaviour otherwise (at least assert).
+ * @param sc - instance to create.
+ * @param granularity - any class size will be a multiple ot this value.
+ *  Must be a power of 2 (and thus greater than zero).
+ * @param desired_factor - desired factor of growth of class size.
+ *  Must be in (1, 2] range. Actual factor can be different.
+ * @param min_alloc - the lowest class size, must be greater than zero.
+ *  The good choice is the same value as granularity.
+ */
+void
+small_class_create(struct small_class *sc, unsigned granularity,
+		   float desired_factor, unsigned min_alloc);
+
+/**
+ * Find position of the most significant bit in a value.
+ * If the value is zero the behaviour is undefined.
+ */
+static inline unsigned
+small_class_fls(unsigned value)
+{
+	/*
+	 * Usually clz is implemented as bsr XOR 0x1f.
+	 * If we add another XOR the compiler will squash 'em and leave just bsr.
+	 */
+	unsigned clz = __builtin_clz(value);
+	return (sizeof(value) * CHAR_BIT - 1) ^ clz;
+}
+
+static inline unsigned
+class_by_size(struct small_class *sc, unsigned size)
+{
+	/*
+	 * Usually we have to decrement size in order to:
+	 * 1)make zero base class.
+	 * 2)round up to class size.
+	 * Also here is a good place to shift size if a user wants the lowest
+	 * class size to be different from granularity.
+	 */
+	unsigned checked_size = size - sc->size_shift_plus_1;
+	/* Check overflow. */
+	size = checked_size > size ? 0 : checked_size;
+	/* Omit never significant bits. */
+	size >>= sc->rnd_bits;
+#ifndef SMALL_CLASS_BRANCHLESS
+	if (size < sc->eff_size)
+		return size; /* Linear approximation, faster part. */
+	/* Get log2 base part of result. Effective bits are omitted. */
+	unsigned log2 = small_class_fls(size >> sc->eff_bits);
+#else
+	/* Evaluation without branching */
+	/*
+	 * Get log2 base part of result. Effective bits are omitted.
+	 * Also note that 1u is ORed to make log2 == 0 for smaller sizes.
+	 */
+	unsigned log2 = small_class_fls((size >> sc->eff_bits) | 1u);
+#endif
+	/* Effective bits (and leading 1?) in size, represent small steps. */
+	unsigned linear_part = size >> log2;
+	/* Log2 part, multiplied correspondingly, represent big steps. */
+	unsigned log2_part = log2 << sc->eff_bits;
+	/* Combine the result. */
+	return linear_part + log2_part;
+}
+
+static inline unsigned
+size_by_class(struct small_class *sc, unsigned cls)
+{
+	++cls;
+	/* Effective bits (without leading 1) in size */
+	unsigned linear_part = cls & sc->eff_mask;
+	/* Log2 base part of the size, maybe with leading 1 of the size. */
+	unsigned log2 = cls >> sc->eff_bits;
+	if (log2 != 0) {
+		/* Remove leading 1 from log2 part and add to linear part. */
+		log2--;
+		linear_part |= sc->eff_size;
+	}
+	/* Reassemble size and add never significant bits. */
+	return sc->size_shift + (linear_part << log2 << sc->rnd_bits);
+}
+
+#if defined(__cplusplus)
+} /* extern "C" { */
+#endif /* defined(__cplusplus) */
+
+#endif /* #ifndef TARANTOOL_SMALL_SMALL_CLASS_H_INCLUDED */
\ No newline at end of file
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8317c65..5ee0821 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -31,6 +31,13 @@ set_source_files_properties(rb_rand.cc PROPERTIES
 add_executable(mempool.test mempool.c)
 target_link_libraries(mempool.test small)
 
+add_executable(small_class.test small_class.c unit.c)
+target_link_libraries(small_class.test small)
+
+add_executable(small_class_branchless.test small_class.c unit.c)
+target_link_libraries(small_class_branchless.test small)
+target_compile_definitions(small_class_branchless.test PUBLIC SMALL_CLASS_BRANCHLESS)
+
 add_executable(small_alloc.test small_alloc.c)
 target_link_libraries(small_alloc.test small)
 
@@ -64,6 +71,8 @@ add_test(region ${CMAKE_CURRENT_BUILD_DIR}/region.test)
 add_test(ibuf ${CMAKE_CURRENT_BUILD_DIR}/ibuf.test)
 add_test(obuf ${CMAKE_CURRENT_BUILD_DIR}/obuf.test)
 add_test(mempool ${CMAKE_CURRENT_BUILD_DIR}/mempool.test)
+add_test(small_class ${CMAKE_CURRENT_BUILD_DIR}/small_class.test)
+add_test(small_class_branchless ${CMAKE_CURRENT_BUILD_DIR}/small_class_branchless.test)
 add_test(small_alloc ${CMAKE_CURRENT_BUILD_DIR}/small_alloc.test)
 add_test(lf_lifo ${CMAKE_CURRENT_BUILD_DIR}/lf_lifo.test)
 add_test(slab_cache ${CMAKE_CURRENT_BUILD_DIR}/slab_cache.test)
diff --git a/test/small_class.c b/test/small_class.c
new file mode 100644
index 0000000..0285819
--- /dev/null
+++ b/test/small_class.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright 2010-2020, Tarantool AUTHORS, please see AUTHORS file.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above
+ *    copyright notice, this list of conditions and the
+ *    following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include "small/small_class.h"
+#include "unit.h"
+#include <math.h>
+
+static void
+test_visual(void)
+{
+	header();
+	plan(0);
+
+	struct small_class sc;
+	small_class_create(&sc, 2, 1.2, 12);
+	printf("desired factor %f, actual factor %f\n",
+	       sc.requested_factor, sc.actual_factor);
+
+	printf("  sz   cls cls_sz real_factor\n");
+	for (unsigned i = 0; i <= 100; i++) {
+		unsigned cls = class_by_size(&sc, i);
+		unsigned cls_sz = size_by_class(&sc, cls);
+		unsigned cls_sz_next = size_by_class(&sc, cls + 1);
+		double real_factor = 1. * cls_sz_next / cls_sz;
+		printf("%3u   %3u   %3u    %lf\n", i, cls, cls_sz, real_factor);
+	}
+
+	check_plan();
+	footer();
+}
+
+static void
+check_expectation()
+{
+	header();
+
+	const unsigned test_sizes = 1024;
+	const unsigned test_classes = 1024;
+	/* we expect 4 effective bits with factor = 1.05 */
+	float factor = 1.05;
+	const unsigned eff_size = 16;
+	unsigned test_class_size[test_classes + eff_size];
+
+	plan(4 * (1 + 2 * (test_sizes + 1)));
+
+	for (int variant = 0; variant < 4; variant++) {
+		unsigned granularity = (variant & 1) != 0 ? 1 : 4;
+		unsigned min_alloc = granularity + ((variant & 2) != 0 ? 0 : 10);
+
+		{
+			unsigned class_size = min_alloc - granularity;
+			/* incremental growth */
+			for (unsigned i = 0; i < eff_size; i++) {
+				class_size += granularity;
+				test_class_size[i] = class_size;
+			}
+			/* exponential growth */
+			unsigned growth = granularity;
+			for (unsigned i = eff_size; i < test_classes; i += eff_size) {
+				for (unsigned j = 0; j < eff_size; j++) {
+					class_size += growth;
+					test_class_size[i + j] = class_size;
+				}
+				growth *= 2;
+			}
+		}
+
+		struct small_class sc;
+		small_class_create(&sc, granularity, factor, min_alloc);
+		is(sc.eff_size, eff_size, "unexpected eff_size");
+
+		for (unsigned s = 0; s <= test_sizes; s++) {
+			unsigned expect_class = 0;
+			while (expect_class < test_classes && s > test_class_size[expect_class])
+				expect_class++;
+			unsigned expect_class_size = test_class_size[expect_class];
+			unsigned got_class = class_by_size(&sc, s);
+			unsigned got_class_size = size_by_class(&sc, got_class);
+
+			is(got_class, expect_class, "unexpected size class");
+			is(got_class_size, expect_class_size, "unexpected class size");
+		}
+	}
+
+	check_plan();
+	footer();
+}
+
+static void
+check_factor()
+{
+	header();
+
+	plan(2 * 99 * 4);
+
+	for (unsigned granularity = 1; granularity <= 4; granularity *= 4) {
+		for(float factor = 1.01; factor < 1.995; factor += 0.01) {
+			struct small_class sc;
+			small_class_create(&sc, granularity, factor, granularity);
+			float k = powf(factor, 0.5f);
+			ok(sc.actual_factor >= factor / k, "wrong actual factor (1)");
+			ok(sc.actual_factor <= factor * k, "wrong actual factor (1)");
+
+			float min_deviation = 1.f;
+			float max_deviation = 1.f;
+			/* Skip incremental growth. */
+			for (unsigned i = sc.eff_size; i < sc.eff_size*3; i++) {
+				unsigned cl_sz1 = size_by_class(&sc, i);
+				unsigned cl_sz2 = size_by_class(&sc, i + 1);
+				float real_growth = 1.f * cl_sz2 / cl_sz1;
+				float deviation = sc.actual_factor / real_growth;
+				if (deviation < min_deviation)
+					min_deviation = deviation;
+				if (deviation > max_deviation)
+					max_deviation = deviation;
+			}
+			float ln2 = logf(2);
+			ok(min_deviation > ln2, "wrong approximation (1)");
+			ok(max_deviation < 2 * ln2, "wrong approximation (2)");
+		}
+	}
+
+	check_plan();
+	footer();
+}
+
+
+int
+main(void)
+{
+	header();
+	plan(3);
+
+	test_visual();
+	check_expectation();
+	check_factor();
+
+	int rc = check_plan();
+	footer();
+	return rc;
+}
diff --git a/test/small_class.result b/test/small_class.result
new file mode 100644
index 0000000..e9d44a7
--- /dev/null
+++ b/test/small_class.result
@@ -0,0 +1,9114 @@
+	*** main ***
+1..3
+	*** test_visual ***
+    1..0
+desired factor 1.200000, actual factor 1.189207
+  sz   cls cls_sz real_factor
+  0     0    12    1.166667
+  1     0    12    1.166667
+  2     0    12    1.166667
+  3     0    12    1.166667
+  4     0    12    1.166667
+  5     0    12    1.166667
+  6     0    12    1.166667
+  7     0    12    1.166667
+  8     0    12    1.166667
+  9     0    12    1.166667
+ 10     0    12    1.166667
+ 11     0    12    1.166667
+ 12     0    12    1.166667
+ 13     1    14    1.142857
+ 14     1    14    1.142857
+ 15     2    16    1.125000
+ 16     2    16    1.125000
+ 17     3    18    1.111111
+ 18     3    18    1.111111
+ 19     4    20    1.100000
+ 20     4    20    1.100000
+ 21     5    22    1.090909
+ 22     5    22    1.090909
+ 23     6    24    1.083333
+ 24     6    24    1.083333
+ 25     7    26    1.153846
+ 26     7    26    1.153846
+ 27     8    30    1.133333
+ 28     8    30    1.133333
+ 29     8    30    1.133333
+ 30     8    30    1.133333
+ 31     9    34    1.117647
+ 32     9    34    1.117647
+ 33     9    34    1.117647
+ 34     9    34    1.117647
+ 35    10    38    1.105263
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+ 38    10    38    1.105263
+ 39    11    42    1.190476
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+ 43    12    50    1.160000
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+ 51    13    58    1.137931
+ 52    13    58    1.137931
+ 53    13    58    1.137931
+ 54    13    58    1.137931
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+ 59    14    66    1.121212
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+ 84    16    90    1.177778
+ 85    16    90    1.177778
+ 86    16    90    1.177778
+ 87    16    90    1.177778
+ 88    16    90    1.177778
+ 89    16    90    1.177778
+ 90    16    90    1.177778
+ 91    17   106    1.150943
+ 92    17   106    1.150943
+ 93    17   106    1.150943
+ 94    17   106    1.150943
+ 95    17   106    1.150943
+ 96    17   106    1.150943
+ 97    17   106    1.150943
+ 98    17   106    1.150943
+ 99    17   106    1.150943
+100    17   106    1.150943
+ok 1 - subtests
+	*** test_visual: done ***
+	*** check_expectation ***
+    1..8204
+    ok 1 - unexpected eff_size
+    ok 2 - unexpected size class
+    ok 3 - unexpected class size
+    ok 4 - unexpected size class
+    ok 5 - unexpected class size
+    ok 6 - unexpected size class
+    ok 7 - unexpected class size
+    ok 8 - unexpected size class
+    ok 9 - unexpected class size
+    ok 10 - unexpected size class
+    ok 11 - unexpected class size
+    ok 12 - unexpected size class
+    ok 13 - unexpected class size
+    ok 14 - unexpected size class
+    ok 15 - unexpected class size
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+    ok 17 - unexpected class size
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+    ok 19 - unexpected class size
+    ok 20 - unexpected size class
+    ok 21 - unexpected class size
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+    ok 25 - unexpected class size
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+    ok 29 - unexpected class size
+    ok 30 - unexpected size class
+    ok 31 - unexpected class size
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+    ok 8149 - unexpected size class
+    ok 8150 - unexpected class size
+    ok 8151 - unexpected size class
+    ok 8152 - unexpected class size
+    ok 8153 - unexpected size class
+    ok 8154 - unexpected class size
+    ok 8155 - unexpected size class
+    ok 8156 - unexpected class size
+    ok 8157 - unexpected size class
+    ok 8158 - unexpected class size
+    ok 8159 - unexpected size class
+    ok 8160 - unexpected class size
+    ok 8161 - unexpected size class
+    ok 8162 - unexpected class size
+    ok 8163 - unexpected size class
+    ok 8164 - unexpected class size
+    ok 8165 - unexpected size class
+    ok 8166 - unexpected class size
+    ok 8167 - unexpected size class
+    ok 8168 - unexpected class size
+    ok 8169 - unexpected size class
+    ok 8170 - unexpected class size
+    ok 8171 - unexpected size class
+    ok 8172 - unexpected class size
+    ok 8173 - unexpected size class
+    ok 8174 - unexpected class size
+    ok 8175 - unexpected size class
+    ok 8176 - unexpected class size
+    ok 8177 - unexpected size class
+    ok 8178 - unexpected class size
+    ok 8179 - unexpected size class
+    ok 8180 - unexpected class size
+    ok 8181 - unexpected size class
+    ok 8182 - unexpected class size
+    ok 8183 - unexpected size class
+    ok 8184 - unexpected class size
+    ok 8185 - unexpected size class
+    ok 8186 - unexpected class size
+    ok 8187 - unexpected size class
+    ok 8188 - unexpected class size
+    ok 8189 - unexpected size class
+    ok 8190 - unexpected class size
+    ok 8191 - unexpected size class
+    ok 8192 - unexpected class size
+    ok 8193 - unexpected size class
+    ok 8194 - unexpected class size
+    ok 8195 - unexpected size class
+    ok 8196 - unexpected class size
+    ok 8197 - unexpected size class
+    ok 8198 - unexpected class size
+    ok 8199 - unexpected size class
+    ok 8200 - unexpected class size
+    ok 8201 - unexpected size class
+    ok 8202 - unexpected class size
+    ok 8203 - unexpected size class
+    ok 8204 - unexpected class size
+ok 2 - subtests
+	*** check_expectation: done ***
+	*** check_factor ***
+    1..792
+    ok 1 - wrong actual factor (1)
+    ok 2 - wrong actual factor (1)
+    ok 3 - wrong approximation (1)
+    ok 4 - wrong approximation (2)
+    ok 5 - wrong actual factor (1)
+    ok 6 - wrong actual factor (1)
+    ok 7 - wrong approximation (1)
+    ok 8 - wrong approximation (2)
+    ok 9 - wrong actual factor (1)
+    ok 10 - wrong actual factor (1)
+    ok 11 - wrong approximation (1)
+    ok 12 - wrong approximation (2)
+    ok 13 - wrong actual factor (1)
+    ok 14 - wrong actual factor (1)
+    ok 15 - wrong approximation (1)
+    ok 16 - wrong approximation (2)
+    ok 17 - wrong actual factor (1)
+    ok 18 - wrong actual factor (1)
+    ok 19 - wrong approximation (1)
+    ok 20 - wrong approximation (2)
+    ok 21 - wrong actual factor (1)
+    ok 22 - wrong actual factor (1)
+    ok 23 - wrong approximation (1)
+    ok 24 - wrong approximation (2)
+    ok 25 - wrong actual factor (1)
+    ok 26 - wrong actual factor (1)
+    ok 27 - wrong approximation (1)
+    ok 28 - wrong approximation (2)
+    ok 29 - wrong actual factor (1)
+    ok 30 - wrong actual factor (1)
+    ok 31 - wrong approximation (1)
+    ok 32 - wrong approximation (2)
+    ok 33 - wrong actual factor (1)
+    ok 34 - wrong actual factor (1)
+    ok 35 - wrong approximation (1)
+    ok 36 - wrong approximation (2)
+    ok 37 - wrong actual factor (1)
+    ok 38 - wrong actual factor (1)
+    ok 39 - wrong approximation (1)
+    ok 40 - wrong approximation (2)
+    ok 41 - wrong actual factor (1)
+    ok 42 - wrong actual factor (1)
+    ok 43 - wrong approximation (1)
+    ok 44 - wrong approximation (2)
+    ok 45 - wrong actual factor (1)
+    ok 46 - wrong actual factor (1)
+    ok 47 - wrong approximation (1)
+    ok 48 - wrong approximation (2)
+    ok 49 - wrong actual factor (1)
+    ok 50 - wrong actual factor (1)
+    ok 51 - wrong approximation (1)
+    ok 52 - wrong approximation (2)
+    ok 53 - wrong actual factor (1)
+    ok 54 - wrong actual factor (1)
+    ok 55 - wrong approximation (1)
+    ok 56 - wrong approximation (2)
+    ok 57 - wrong actual factor (1)
+    ok 58 - wrong actual factor (1)
+    ok 59 - wrong approximation (1)
+    ok 60 - wrong approximation (2)
+    ok 61 - wrong actual factor (1)
+    ok 62 - wrong actual factor (1)
+    ok 63 - wrong approximation (1)
+    ok 64 - wrong approximation (2)
+    ok 65 - wrong actual factor (1)
+    ok 66 - wrong actual factor (1)
+    ok 67 - wrong approximation (1)
+    ok 68 - wrong approximation (2)
+    ok 69 - wrong actual factor (1)
+    ok 70 - wrong actual factor (1)
+    ok 71 - wrong approximation (1)
+    ok 72 - wrong approximation (2)
+    ok 73 - wrong actual factor (1)
+    ok 74 - wrong actual factor (1)
+    ok 75 - wrong approximation (1)
+    ok 76 - wrong approximation (2)
+    ok 77 - wrong actual factor (1)
+    ok 78 - wrong actual factor (1)
+    ok 79 - wrong approximation (1)
+    ok 80 - wrong approximation (2)
+    ok 81 - wrong actual factor (1)
+    ok 82 - wrong actual factor (1)
+    ok 83 - wrong approximation (1)
+    ok 84 - wrong approximation (2)
+    ok 85 - wrong actual factor (1)
+    ok 86 - wrong actual factor (1)
+    ok 87 - wrong approximation (1)
+    ok 88 - wrong approximation (2)
+    ok 89 - wrong actual factor (1)
+    ok 90 - wrong actual factor (1)
+    ok 91 - wrong approximation (1)
+    ok 92 - wrong approximation (2)
+    ok 93 - wrong actual factor (1)
+    ok 94 - wrong actual factor (1)
+    ok 95 - wrong approximation (1)
+    ok 96 - wrong approximation (2)
+    ok 97 - wrong actual factor (1)
+    ok 98 - wrong actual factor (1)
+    ok 99 - wrong approximation (1)
+    ok 100 - wrong approximation (2)
+    ok 101 - wrong actual factor (1)
+    ok 102 - wrong actual factor (1)
+    ok 103 - wrong approximation (1)
+    ok 104 - wrong approximation (2)
+    ok 105 - wrong actual factor (1)
+    ok 106 - wrong actual factor (1)
+    ok 107 - wrong approximation (1)
+    ok 108 - wrong approximation (2)
+    ok 109 - wrong actual factor (1)
+    ok 110 - wrong actual factor (1)
+    ok 111 - wrong approximation (1)
+    ok 112 - wrong approximation (2)
+    ok 113 - wrong actual factor (1)
+    ok 114 - wrong actual factor (1)
+    ok 115 - wrong approximation (1)
+    ok 116 - wrong approximation (2)
+    ok 117 - wrong actual factor (1)
+    ok 118 - wrong actual factor (1)
+    ok 119 - wrong approximation (1)
+    ok 120 - wrong approximation (2)
+    ok 121 - wrong actual factor (1)
+    ok 122 - wrong actual factor (1)
+    ok 123 - wrong approximation (1)
+    ok 124 - wrong approximation (2)
+    ok 125 - wrong actual factor (1)
+    ok 126 - wrong actual factor (1)
+    ok 127 - wrong approximation (1)
+    ok 128 - wrong approximation (2)
+    ok 129 - wrong actual factor (1)
+    ok 130 - wrong actual factor (1)
+    ok 131 - wrong approximation (1)
+    ok 132 - wrong approximation (2)
+    ok 133 - wrong actual factor (1)
+    ok 134 - wrong actual factor (1)
+    ok 135 - wrong approximation (1)
+    ok 136 - wrong approximation (2)
+    ok 137 - wrong actual factor (1)
+    ok 138 - wrong actual factor (1)
+    ok 139 - wrong approximation (1)
+    ok 140 - wrong approximation (2)
+    ok 141 - wrong actual factor (1)
+    ok 142 - wrong actual factor (1)
+    ok 143 - wrong approximation (1)
+    ok 144 - wrong approximation (2)
+    ok 145 - wrong actual factor (1)
+    ok 146 - wrong actual factor (1)
+    ok 147 - wrong approximation (1)
+    ok 148 - wrong approximation (2)
+    ok 149 - wrong actual factor (1)
+    ok 150 - wrong actual factor (1)
+    ok 151 - wrong approximation (1)
+    ok 152 - wrong approximation (2)
+    ok 153 - wrong actual factor (1)
+    ok 154 - wrong actual factor (1)
+    ok 155 - wrong approximation (1)
+    ok 156 - wrong approximation (2)
+    ok 157 - wrong actual factor (1)
+    ok 158 - wrong actual factor (1)
+    ok 159 - wrong approximation (1)
+    ok 160 - wrong approximation (2)
+    ok 161 - wrong actual factor (1)
+    ok 162 - wrong actual factor (1)
+    ok 163 - wrong approximation (1)
+    ok 164 - wrong approximation (2)
+    ok 165 - wrong actual factor (1)
+    ok 166 - wrong actual factor (1)
+    ok 167 - wrong approximation (1)
+    ok 168 - wrong approximation (2)
+    ok 169 - wrong actual factor (1)
+    ok 170 - wrong actual factor (1)
+    ok 171 - wrong approximation (1)
+    ok 172 - wrong approximation (2)
+    ok 173 - wrong actual factor (1)
+    ok 174 - wrong actual factor (1)
+    ok 175 - wrong approximation (1)
+    ok 176 - wrong approximation (2)
+    ok 177 - wrong actual factor (1)
+    ok 178 - wrong actual factor (1)
+    ok 179 - wrong approximation (1)
+    ok 180 - wrong approximation (2)
+    ok 181 - wrong actual factor (1)
+    ok 182 - wrong actual factor (1)
+    ok 183 - wrong approximation (1)
+    ok 184 - wrong approximation (2)
+    ok 185 - wrong actual factor (1)
+    ok 186 - wrong actual factor (1)
+    ok 187 - wrong approximation (1)
+    ok 188 - wrong approximation (2)
+    ok 189 - wrong actual factor (1)
+    ok 190 - wrong actual factor (1)
+    ok 191 - wrong approximation (1)
+    ok 192 - wrong approximation (2)
+    ok 193 - wrong actual factor (1)
+    ok 194 - wrong actual factor (1)
+    ok 195 - wrong approximation (1)
+    ok 196 - wrong approximation (2)
+    ok 197 - wrong actual factor (1)
+    ok 198 - wrong actual factor (1)
+    ok 199 - wrong approximation (1)
+    ok 200 - wrong approximation (2)
+    ok 201 - wrong actual factor (1)
+    ok 202 - wrong actual factor (1)
+    ok 203 - wrong approximation (1)
+    ok 204 - wrong approximation (2)
+    ok 205 - wrong actual factor (1)
+    ok 206 - wrong actual factor (1)
+    ok 207 - wrong approximation (1)
+    ok 208 - wrong approximation (2)
+    ok 209 - wrong actual factor (1)
+    ok 210 - wrong actual factor (1)
+    ok 211 - wrong approximation (1)
+    ok 212 - wrong approximation (2)
+    ok 213 - wrong actual factor (1)
+    ok 214 - wrong actual factor (1)
+    ok 215 - wrong approximation (1)
+    ok 216 - wrong approximation (2)
+    ok 217 - wrong actual factor (1)
+    ok 218 - wrong actual factor (1)
+    ok 219 - wrong approximation (1)
+    ok 220 - wrong approximation (2)
+    ok 221 - wrong actual factor (1)
+    ok 222 - wrong actual factor (1)
+    ok 223 - wrong approximation (1)
+    ok 224 - wrong approximation (2)
+    ok 225 - wrong actual factor (1)
+    ok 226 - wrong actual factor (1)
+    ok 227 - wrong approximation (1)
+    ok 228 - wrong approximation (2)
+    ok 229 - wrong actual factor (1)
+    ok 230 - wrong actual factor (1)
+    ok 231 - wrong approximation (1)
+    ok 232 - wrong approximation (2)
+    ok 233 - wrong actual factor (1)
+    ok 234 - wrong actual factor (1)
+    ok 235 - wrong approximation (1)
+    ok 236 - wrong approximation (2)
+    ok 237 - wrong actual factor (1)
+    ok 238 - wrong actual factor (1)
+    ok 239 - wrong approximation (1)
+    ok 240 - wrong approximation (2)
+    ok 241 - wrong actual factor (1)
+    ok 242 - wrong actual factor (1)
+    ok 243 - wrong approximation (1)
+    ok 244 - wrong approximation (2)
+    ok 245 - wrong actual factor (1)
+    ok 246 - wrong actual factor (1)
+    ok 247 - wrong approximation (1)
+    ok 248 - wrong approximation (2)
+    ok 249 - wrong actual factor (1)
+    ok 250 - wrong actual factor (1)
+    ok 251 - wrong approximation (1)
+    ok 252 - wrong approximation (2)
+    ok 253 - wrong actual factor (1)
+    ok 254 - wrong actual factor (1)
+    ok 255 - wrong approximation (1)
+    ok 256 - wrong approximation (2)
+    ok 257 - wrong actual factor (1)
+    ok 258 - wrong actual factor (1)
+    ok 259 - wrong approximation (1)
+    ok 260 - wrong approximation (2)
+    ok 261 - wrong actual factor (1)
+    ok 262 - wrong actual factor (1)
+    ok 263 - wrong approximation (1)
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+    ok 265 - wrong actual factor (1)
+    ok 266 - wrong actual factor (1)
+    ok 267 - wrong approximation (1)
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+    ok 269 - wrong actual factor (1)
+    ok 270 - wrong actual factor (1)
+    ok 271 - wrong approximation (1)
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+    ok 273 - wrong actual factor (1)
+    ok 274 - wrong actual factor (1)
+    ok 275 - wrong approximation (1)
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+    ok 279 - wrong approximation (1)
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+    ok 281 - wrong actual factor (1)
+    ok 282 - wrong actual factor (1)
+    ok 283 - wrong approximation (1)
+    ok 284 - wrong approximation (2)
+    ok 285 - wrong actual factor (1)
+    ok 286 - wrong actual factor (1)
+    ok 287 - wrong approximation (1)
+    ok 288 - wrong approximation (2)
+    ok 289 - wrong actual factor (1)
+    ok 290 - wrong actual factor (1)
+    ok 291 - wrong approximation (1)
+    ok 292 - wrong approximation (2)
+    ok 293 - wrong actual factor (1)
+    ok 294 - wrong actual factor (1)
+    ok 295 - wrong approximation (1)
+    ok 296 - wrong approximation (2)
+    ok 297 - wrong actual factor (1)
+    ok 298 - wrong actual factor (1)
+    ok 299 - wrong approximation (1)
+    ok 300 - wrong approximation (2)
+    ok 301 - wrong actual factor (1)
+    ok 302 - wrong actual factor (1)
+    ok 303 - wrong approximation (1)
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+    ok 315 - wrong approximation (1)
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+    ok 317 - wrong actual factor (1)
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+    ok 321 - wrong actual factor (1)
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+    ok 323 - wrong approximation (1)
+    ok 324 - wrong approximation (2)
+    ok 325 - wrong actual factor (1)
+    ok 326 - wrong actual factor (1)
+    ok 327 - wrong approximation (1)
+    ok 328 - wrong approximation (2)
+    ok 329 - wrong actual factor (1)
+    ok 330 - wrong actual factor (1)
+    ok 331 - wrong approximation (1)
+    ok 332 - wrong approximation (2)
+    ok 333 - wrong actual factor (1)
+    ok 334 - wrong actual factor (1)
+    ok 335 - wrong approximation (1)
+    ok 336 - wrong approximation (2)
+    ok 337 - wrong actual factor (1)
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+    ok 343 - wrong approximation (1)
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+    ok 345 - wrong actual factor (1)
+    ok 346 - wrong actual factor (1)
+    ok 347 - wrong approximation (1)
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+    ok 349 - wrong actual factor (1)
+    ok 350 - wrong actual factor (1)
+    ok 351 - wrong approximation (1)
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+    ok 353 - wrong actual factor (1)
+    ok 354 - wrong actual factor (1)
+    ok 355 - wrong approximation (1)
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+    ok 357 - wrong actual factor (1)
+    ok 358 - wrong actual factor (1)
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+    ok 413 - wrong actual factor (1)
+    ok 414 - wrong actual factor (1)
+    ok 415 - wrong approximation (1)
+    ok 416 - wrong approximation (2)
+    ok 417 - wrong actual factor (1)
+    ok 418 - wrong actual factor (1)
+    ok 419 - wrong approximation (1)
+    ok 420 - wrong approximation (2)
+    ok 421 - wrong actual factor (1)
+    ok 422 - wrong actual factor (1)
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+    ok 424 - wrong approximation (2)
+    ok 425 - wrong actual factor (1)
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+    ok 505 - wrong actual factor (1)
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+    ok 593 - wrong actual factor (1)
+    ok 594 - wrong actual factor (1)
+    ok 595 - wrong approximation (1)
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+    ok 597 - wrong actual factor (1)
+    ok 598 - wrong actual factor (1)
+    ok 599 - wrong approximation (1)
+    ok 600 - wrong approximation (2)
+    ok 601 - wrong actual factor (1)
+    ok 602 - wrong actual factor (1)
+    ok 603 - wrong approximation (1)
+    ok 604 - wrong approximation (2)
+    ok 605 - wrong actual factor (1)
+    ok 606 - wrong actual factor (1)
+    ok 607 - wrong approximation (1)
+    ok 608 - wrong approximation (2)
+    ok 609 - wrong actual factor (1)
+    ok 610 - wrong actual factor (1)
+    ok 611 - wrong approximation (1)
+    ok 612 - wrong approximation (2)
+    ok 613 - wrong actual factor (1)
+    ok 614 - wrong actual factor (1)
+    ok 615 - wrong approximation (1)
+    ok 616 - wrong approximation (2)
+    ok 617 - wrong actual factor (1)
+    ok 618 - wrong actual factor (1)
+    ok 619 - wrong approximation (1)
+    ok 620 - wrong approximation (2)
+    ok 621 - wrong actual factor (1)
+    ok 622 - wrong actual factor (1)
+    ok 623 - wrong approximation (1)
+    ok 624 - wrong approximation (2)
+    ok 625 - wrong actual factor (1)
+    ok 626 - wrong actual factor (1)
+    ok 627 - wrong approximation (1)
+    ok 628 - wrong approximation (2)
+    ok 629 - wrong actual factor (1)
+    ok 630 - wrong actual factor (1)
+    ok 631 - wrong approximation (1)
+    ok 632 - wrong approximation (2)
+    ok 633 - wrong actual factor (1)
+    ok 634 - wrong actual factor (1)
+    ok 635 - wrong approximation (1)
+    ok 636 - wrong approximation (2)
+    ok 637 - wrong actual factor (1)
+    ok 638 - wrong actual factor (1)
+    ok 639 - wrong approximation (1)
+    ok 640 - wrong approximation (2)
+    ok 641 - wrong actual factor (1)
+    ok 642 - wrong actual factor (1)
+    ok 643 - wrong approximation (1)
+    ok 644 - wrong approximation (2)
+    ok 645 - wrong actual factor (1)
+    ok 646 - wrong actual factor (1)
+    ok 647 - wrong approximation (1)
+    ok 648 - wrong approximation (2)
+    ok 649 - wrong actual factor (1)
+    ok 650 - wrong actual factor (1)
+    ok 651 - wrong approximation (1)
+    ok 652 - wrong approximation (2)
+    ok 653 - wrong actual factor (1)
+    ok 654 - wrong actual factor (1)
+    ok 655 - wrong approximation (1)
+    ok 656 - wrong approximation (2)
+    ok 657 - wrong actual factor (1)
+    ok 658 - wrong actual factor (1)
+    ok 659 - wrong approximation (1)
+    ok 660 - wrong approximation (2)
+    ok 661 - wrong actual factor (1)
+    ok 662 - wrong actual factor (1)
+    ok 663 - wrong approximation (1)
+    ok 664 - wrong approximation (2)
+    ok 665 - wrong actual factor (1)
+    ok 666 - wrong actual factor (1)
+    ok 667 - wrong approximation (1)
+    ok 668 - wrong approximation (2)
+    ok 669 - wrong actual factor (1)
+    ok 670 - wrong actual factor (1)
+    ok 671 - wrong approximation (1)
+    ok 672 - wrong approximation (2)
+    ok 673 - wrong actual factor (1)
+    ok 674 - wrong actual factor (1)
+    ok 675 - wrong approximation (1)
+    ok 676 - wrong approximation (2)
+    ok 677 - wrong actual factor (1)
+    ok 678 - wrong actual factor (1)
+    ok 679 - wrong approximation (1)
+    ok 680 - wrong approximation (2)
+    ok 681 - wrong actual factor (1)
+    ok 682 - wrong actual factor (1)
+    ok 683 - wrong approximation (1)
+    ok 684 - wrong approximation (2)
+    ok 685 - wrong actual factor (1)
+    ok 686 - wrong actual factor (1)
+    ok 687 - wrong approximation (1)
+    ok 688 - wrong approximation (2)
+    ok 689 - wrong actual factor (1)
+    ok 690 - wrong actual factor (1)
+    ok 691 - wrong approximation (1)
+    ok 692 - wrong approximation (2)
+    ok 693 - wrong actual factor (1)
+    ok 694 - wrong actual factor (1)
+    ok 695 - wrong approximation (1)
+    ok 696 - wrong approximation (2)
+    ok 697 - wrong actual factor (1)
+    ok 698 - wrong actual factor (1)
+    ok 699 - wrong approximation (1)
+    ok 700 - wrong approximation (2)
+    ok 701 - wrong actual factor (1)
+    ok 702 - wrong actual factor (1)
+    ok 703 - wrong approximation (1)
+    ok 704 - wrong approximation (2)
+    ok 705 - wrong actual factor (1)
+    ok 706 - wrong actual factor (1)
+    ok 707 - wrong approximation (1)
+    ok 708 - wrong approximation (2)
+    ok 709 - wrong actual factor (1)
+    ok 710 - wrong actual factor (1)
+    ok 711 - wrong approximation (1)
+    ok 712 - wrong approximation (2)
+    ok 713 - wrong actual factor (1)
+    ok 714 - wrong actual factor (1)
+    ok 715 - wrong approximation (1)
+    ok 716 - wrong approximation (2)
+    ok 717 - wrong actual factor (1)
+    ok 718 - wrong actual factor (1)
+    ok 719 - wrong approximation (1)
+    ok 720 - wrong approximation (2)
+    ok 721 - wrong actual factor (1)
+    ok 722 - wrong actual factor (1)
+    ok 723 - wrong approximation (1)
+    ok 724 - wrong approximation (2)
+    ok 725 - wrong actual factor (1)
+    ok 726 - wrong actual factor (1)
+    ok 727 - wrong approximation (1)
+    ok 728 - wrong approximation (2)
+    ok 729 - wrong actual factor (1)
+    ok 730 - wrong actual factor (1)
+    ok 731 - wrong approximation (1)
+    ok 732 - wrong approximation (2)
+    ok 733 - wrong actual factor (1)
+    ok 734 - wrong actual factor (1)
+    ok 735 - wrong approximation (1)
+    ok 736 - wrong approximation (2)
+    ok 737 - wrong actual factor (1)
+    ok 738 - wrong actual factor (1)
+    ok 739 - wrong approximation (1)
+    ok 740 - wrong approximation (2)
+    ok 741 - wrong actual factor (1)
+    ok 742 - wrong actual factor (1)
+    ok 743 - wrong approximation (1)
+    ok 744 - wrong approximation (2)
+    ok 745 - wrong actual factor (1)
+    ok 746 - wrong actual factor (1)
+    ok 747 - wrong approximation (1)
+    ok 748 - wrong approximation (2)
+    ok 749 - wrong actual factor (1)
+    ok 750 - wrong actual factor (1)
+    ok 751 - wrong approximation (1)
+    ok 752 - wrong approximation (2)
+    ok 753 - wrong actual factor (1)
+    ok 754 - wrong actual factor (1)
+    ok 755 - wrong approximation (1)
+    ok 756 - wrong approximation (2)
+    ok 757 - wrong actual factor (1)
+    ok 758 - wrong actual factor (1)
+    ok 759 - wrong approximation (1)
+    ok 760 - wrong approximation (2)
+    ok 761 - wrong actual factor (1)
+    ok 762 - wrong actual factor (1)
+    ok 763 - wrong approximation (1)
+    ok 764 - wrong approximation (2)
+    ok 765 - wrong actual factor (1)
+    ok 766 - wrong actual factor (1)
+    ok 767 - wrong approximation (1)
+    ok 768 - wrong approximation (2)
+    ok 769 - wrong actual factor (1)
+    ok 770 - wrong actual factor (1)
+    ok 771 - wrong approximation (1)
+    ok 772 - wrong approximation (2)
+    ok 773 - wrong actual factor (1)
+    ok 774 - wrong actual factor (1)
+    ok 775 - wrong approximation (1)
+    ok 776 - wrong approximation (2)
+    ok 777 - wrong actual factor (1)
+    ok 778 - wrong actual factor (1)
+    ok 779 - wrong approximation (1)
+    ok 780 - wrong approximation (2)
+    ok 781 - wrong actual factor (1)
+    ok 782 - wrong actual factor (1)
+    ok 783 - wrong approximation (1)
+    ok 784 - wrong approximation (2)
+    ok 785 - wrong actual factor (1)
+    ok 786 - wrong actual factor (1)
+    ok 787 - wrong approximation (1)
+    ok 788 - wrong approximation (2)
+    ok 789 - wrong actual factor (1)
+    ok 790 - wrong actual factor (1)
+    ok 791 - wrong approximation (1)
+    ok 792 - wrong approximation (2)
+ok 3 - subtests
+	*** check_factor: done ***
+	*** main: done ***
diff --git a/test/small_class_branchless.result b/test/small_class_branchless.result
new file mode 100644
index 0000000..e9d44a7
--- /dev/null
+++ b/test/small_class_branchless.result
@@ -0,0 +1,9114 @@
+	*** main ***
+1..3
+	*** test_visual ***
+    1..0
+desired factor 1.200000, actual factor 1.189207
+  sz   cls cls_sz real_factor
+  0     0    12    1.166667
+  1     0    12    1.166667
+  2     0    12    1.166667
+  3     0    12    1.166667
+  4     0    12    1.166667
+  5     0    12    1.166667
+  6     0    12    1.166667
+  7     0    12    1.166667
+  8     0    12    1.166667
+  9     0    12    1.166667
+ 10     0    12    1.166667
+ 11     0    12    1.166667
+ 12     0    12    1.166667
+ 13     1    14    1.142857
+ 14     1    14    1.142857
+ 15     2    16    1.125000
+ 16     2    16    1.125000
+ 17     3    18    1.111111
+ 18     3    18    1.111111
+ 19     4    20    1.100000
+ 20     4    20    1.100000
+ 21     5    22    1.090909
+ 22     5    22    1.090909
+ 23     6    24    1.083333
+ 24     6    24    1.083333
+ 25     7    26    1.153846
+ 26     7    26    1.153846
+ 27     8    30    1.133333
+ 28     8    30    1.133333
+ 29     8    30    1.133333
+ 30     8    30    1.133333
+ 31     9    34    1.117647
+ 32     9    34    1.117647
+ 33     9    34    1.117647
+ 34     9    34    1.117647
+ 35    10    38    1.105263
+ 36    10    38    1.105263
+ 37    10    38    1.105263
+ 38    10    38    1.105263
+ 39    11    42    1.190476
+ 40    11    42    1.190476
+ 41    11    42    1.190476
+ 42    11    42    1.190476
+ 43    12    50    1.160000
+ 44    12    50    1.160000
+ 45    12    50    1.160000
+ 46    12    50    1.160000
+ 47    12    50    1.160000
+ 48    12    50    1.160000
+ 49    12    50    1.160000
+ 50    12    50    1.160000
+ 51    13    58    1.137931
+ 52    13    58    1.137931
+ 53    13    58    1.137931
+ 54    13    58    1.137931
+ 55    13    58    1.137931
+ 56    13    58    1.137931
+ 57    13    58    1.137931
+ 58    13    58    1.137931
+ 59    14    66    1.121212
+ 60    14    66    1.121212
+ 61    14    66    1.121212
+ 62    14    66    1.121212
+ 63    14    66    1.121212
+ 64    14    66    1.121212
+ 65    14    66    1.121212
+ 66    14    66    1.121212
+ 67    15    74    1.216216
+ 68    15    74    1.216216
+ 69    15    74    1.216216
+ 70    15    74    1.216216
+ 71    15    74    1.216216
+ 72    15    74    1.216216
+ 73    15    74    1.216216
+ 74    15    74    1.216216
+ 75    16    90    1.177778
+ 76    16    90    1.177778
+ 77    16    90    1.177778
+ 78    16    90    1.177778
+ 79    16    90    1.177778
+ 80    16    90    1.177778
+ 81    16    90    1.177778
+ 82    16    90    1.177778
+ 83    16    90    1.177778
+ 84    16    90    1.177778
+ 85    16    90    1.177778
+ 86    16    90    1.177778
+ 87    16    90    1.177778
+ 88    16    90    1.177778
+ 89    16    90    1.177778
+ 90    16    90    1.177778
+ 91    17   106    1.150943
+ 92    17   106    1.150943
+ 93    17   106    1.150943
+ 94    17   106    1.150943
+ 95    17   106    1.150943
+ 96    17   106    1.150943
+ 97    17   106    1.150943
+ 98    17   106    1.150943
+ 99    17   106    1.150943
+100    17   106    1.150943
+ok 1 - subtests
+	*** test_visual: done ***
+	*** check_expectation ***
+    1..8204
+    ok 1 - unexpected eff_size
+    ok 2 - unexpected size class
+    ok 3 - unexpected class size
+    ok 4 - unexpected size class
+    ok 5 - unexpected class size
+    ok 6 - unexpected size class
+    ok 7 - unexpected class size
+    ok 8 - unexpected size class
+    ok 9 - unexpected class size
+    ok 10 - unexpected size class
+    ok 11 - unexpected class size
+    ok 12 - unexpected size class
+    ok 13 - unexpected class size
+    ok 14 - unexpected size class
+    ok 15 - unexpected class size
+    ok 16 - unexpected size class
+    ok 17 - unexpected class size
+    ok 18 - unexpected size class
+    ok 19 - unexpected class size
+    ok 20 - unexpected size class
+    ok 21 - unexpected class size
+    ok 22 - unexpected size class
+    ok 23 - unexpected class size
+    ok 24 - unexpected size class
+    ok 25 - unexpected class size
+    ok 26 - unexpected size class
+    ok 27 - unexpected class size
+    ok 28 - unexpected size class
+    ok 29 - unexpected class size
+    ok 30 - unexpected size class
+    ok 31 - unexpected class size
+    ok 32 - unexpected size class
+    ok 33 - unexpected class size
+    ok 34 - unexpected size class
+    ok 35 - unexpected class size
+    ok 36 - unexpected size class
+    ok 37 - unexpected class size
+    ok 38 - unexpected size class
+    ok 39 - unexpected class size
+    ok 40 - unexpected size class
+    ok 41 - unexpected class size
+    ok 42 - unexpected size class
+    ok 43 - unexpected class size
+    ok 44 - unexpected size class
+    ok 45 - unexpected class size
+    ok 46 - unexpected size class
+    ok 47 - unexpected class size
+    ok 48 - unexpected size class
+    ok 49 - unexpected class size
+    ok 50 - unexpected size class
+    ok 51 - unexpected class size
+    ok 52 - unexpected size class
+    ok 53 - unexpected class size
+    ok 54 - unexpected size class
+    ok 55 - unexpected class size
+    ok 56 - unexpected size class
+    ok 57 - unexpected class size
+    ok 58 - unexpected size class
+    ok 59 - unexpected class size
+    ok 60 - unexpected size class
+    ok 61 - unexpected class size
+    ok 62 - unexpected size class
+    ok 63 - unexpected class size
+    ok 64 - unexpected size class
+    ok 65 - unexpected class size
+    ok 66 - unexpected size class
+    ok 67 - unexpected class size
+    ok 68 - unexpected size class
+    ok 69 - unexpected class size
+    ok 70 - unexpected size class
+    ok 71 - unexpected class size
+    ok 72 - unexpected size class
+    ok 73 - unexpected class size
+    ok 74 - unexpected size class
+    ok 75 - unexpected class size
+    ok 76 - unexpected size class
+    ok 77 - unexpected class size
+    ok 78 - unexpected size class
+    ok 79 - unexpected class size
+    ok 80 - unexpected size class
+    ok 81 - unexpected class size
+    ok 82 - unexpected size class
+    ok 83 - unexpected class size
+    ok 84 - unexpected size class
+    ok 85 - unexpected class size
+    ok 86 - unexpected size class
+    ok 87 - unexpected class size
+    ok 88 - unexpected size class
+    ok 89 - unexpected class size
+    ok 90 - unexpected size class
+    ok 91 - unexpected class size
+    ok 92 - unexpected size class
+    ok 93 - unexpected class size
+    ok 94 - unexpected size class
+    ok 95 - unexpected class size
+    ok 96 - unexpected size class
+    ok 97 - unexpected class size
+    ok 98 - unexpected size class
+    ok 99 - unexpected class size
+    ok 100 - unexpected size class
+    ok 101 - unexpected class size
+    ok 102 - unexpected size class
+    ok 103 - unexpected class size
+    ok 104 - unexpected size class
+    ok 105 - unexpected class size
+    ok 106 - unexpected size class
+    ok 107 - unexpected class size
+    ok 108 - unexpected size class
+    ok 109 - unexpected class size
+    ok 110 - unexpected size class
+    ok 111 - unexpected class size
+    ok 112 - unexpected size class
+    ok 113 - unexpected class size
+    ok 114 - unexpected size class
+    ok 115 - unexpected class size
+    ok 116 - unexpected size class
+    ok 117 - unexpected class size
+    ok 118 - unexpected size class
+    ok 119 - unexpected class size
+    ok 120 - unexpected size class
+    ok 121 - unexpected class size
+    ok 122 - unexpected size class
+    ok 123 - unexpected class size
+    ok 124 - unexpected size class
+    ok 125 - unexpected class size
+    ok 126 - unexpected size class
+    ok 127 - unexpected class size
+    ok 128 - unexpected size class
+    ok 129 - unexpected class size
+    ok 130 - unexpected size class
+    ok 131 - unexpected class size
+    ok 132 - unexpected size class
+    ok 133 - unexpected class size
+    ok 134 - unexpected size class
+    ok 135 - unexpected class size
+    ok 136 - unexpected size class
+    ok 137 - unexpected class size
+    ok 138 - unexpected size class
+    ok 139 - unexpected class size
+    ok 140 - unexpected size class
+    ok 141 - unexpected class size
+    ok 142 - unexpected size class
+    ok 143 - unexpected class size
+    ok 144 - unexpected size class
+    ok 145 - unexpected class size
+    ok 146 - unexpected size class
+    ok 147 - unexpected class size
+    ok 148 - unexpected size class
+    ok 149 - unexpected class size
+    ok 150 - unexpected size class
+    ok 151 - unexpected class size
+    ok 152 - unexpected size class
+    ok 153 - unexpected class size
+    ok 154 - unexpected size class
+    ok 155 - unexpected class size
+    ok 156 - unexpected size class
+    ok 157 - unexpected class size
+    ok 158 - unexpected size class
+    ok 159 - unexpected class size
+    ok 160 - unexpected size class
+    ok 161 - unexpected class size
+    ok 162 - unexpected size class
+    ok 163 - unexpected class size
+    ok 164 - unexpected size class
+    ok 165 - unexpected class size
+    ok 166 - unexpected size class
+    ok 167 - unexpected class size
+    ok 168 - unexpected size class
+    ok 169 - unexpected class size
+    ok 170 - unexpected size class
+    ok 171 - unexpected class size
+    ok 172 - unexpected size class
+    ok 173 - unexpected class size
+    ok 174 - unexpected size class
+    ok 175 - unexpected class size
+    ok 176 - unexpected size class
+    ok 177 - unexpected class size
+    ok 178 - unexpected size class
+    ok 179 - unexpected class size
+    ok 180 - unexpected size class
+    ok 181 - unexpected class size
+    ok 182 - unexpected size class
+    ok 183 - unexpected class size
+    ok 184 - unexpected size class
+    ok 185 - unexpected class size
+    ok 186 - unexpected size class
+    ok 187 - unexpected class size
+    ok 188 - unexpected size class
+    ok 189 - unexpected class size
+    ok 190 - unexpected size class
+    ok 191 - unexpected class size
+    ok 192 - unexpected size class
+    ok 193 - unexpected class size
+    ok 194 - unexpected size class
+    ok 195 - unexpected class size
+    ok 196 - unexpected size class
+    ok 197 - unexpected class size
+    ok 198 - unexpected size class
+    ok 199 - unexpected class size
+    ok 200 - unexpected size class
+    ok 201 - unexpected class size
+    ok 202 - unexpected size class
+    ok 203 - unexpected class size
+    ok 204 - unexpected size class
+    ok 205 - unexpected class size
+    ok 206 - unexpected size class
+    ok 207 - unexpected class size
+    ok 208 - unexpected size class
+    ok 209 - unexpected class size
+    ok 210 - unexpected size class
+    ok 211 - unexpected class size
+    ok 212 - unexpected size class
+    ok 213 - unexpected class size
+    ok 214 - unexpected size class
+    ok 215 - unexpected class size
+    ok 216 - unexpected size class
+    ok 217 - unexpected class size
+    ok 218 - unexpected size class
+    ok 219 - unexpected class size
+    ok 220 - unexpected size class
+    ok 221 - unexpected class size
+    ok 222 - unexpected size class
+    ok 223 - unexpected class size
+    ok 224 - unexpected size class
+    ok 225 - unexpected class size
+    ok 226 - unexpected size class
+    ok 227 - unexpected class size
+    ok 228 - unexpected size class
+    ok 229 - unexpected class size
+    ok 230 - unexpected size class
+    ok 231 - unexpected class size
+    ok 232 - unexpected size class
+    ok 233 - unexpected class size
+    ok 234 - unexpected size class
+    ok 235 - unexpected class size
+    ok 236 - unexpected size class
+    ok 237 - unexpected class size
+    ok 238 - unexpected size class
+    ok 239 - unexpected class size
+    ok 240 - unexpected size class
+    ok 241 - unexpected class size
+    ok 242 - unexpected size class
+    ok 243 - unexpected class size
+    ok 244 - unexpected size class
+    ok 245 - unexpected class size
+    ok 246 - unexpected size class
+    ok 247 - unexpected class size
+    ok 248 - unexpected size class
+    ok 249 - unexpected class size
+    ok 250 - unexpected size class
+    ok 251 - unexpected class size
+    ok 252 - unexpected size class
+    ok 253 - unexpected class size
+    ok 254 - unexpected size class
+    ok 255 - unexpected class size
+    ok 256 - unexpected size class
+    ok 257 - unexpected class size
+    ok 258 - unexpected size class
+    ok 259 - unexpected class size
+    ok 260 - unexpected size class
+    ok 261 - unexpected class size
+    ok 262 - unexpected size class
+    ok 263 - unexpected class size
+    ok 264 - unexpected size class
+    ok 265 - unexpected class size
+    ok 266 - unexpected size class
+    ok 267 - unexpected class size
+    ok 268 - unexpected size class
+    ok 269 - unexpected class size
+    ok 270 - unexpected size class
+    ok 271 - unexpected class size
+    ok 272 - unexpected size class
+    ok 273 - unexpected class size
+    ok 274 - unexpected size class
+    ok 275 - unexpected class size
+    ok 276 - unexpected size class
+    ok 277 - unexpected class size
+    ok 278 - unexpected size class
+    ok 279 - unexpected class size
+    ok 280 - unexpected size class
+    ok 281 - unexpected class size
+    ok 282 - unexpected size class
+    ok 283 - unexpected class size
+    ok 284 - unexpected size class
+    ok 285 - unexpected class size
+    ok 286 - unexpected size class
+    ok 287 - unexpected class size
+    ok 288 - unexpected size class
+    ok 289 - unexpected class size
+    ok 290 - unexpected size class
+    ok 291 - unexpected class size
+    ok 292 - unexpected size class
+    ok 293 - unexpected class size
+    ok 294 - unexpected size class
+    ok 295 - unexpected class size
+    ok 296 - unexpected size class
+    ok 297 - unexpected class size
+    ok 298 - unexpected size class
+    ok 299 - unexpected class size
+    ok 300 - unexpected size class
+    ok 301 - unexpected class size
+    ok 302 - unexpected size class
+    ok 303 - unexpected class size
+    ok 304 - unexpected size class
+    ok 305 - unexpected class size
+    ok 306 - unexpected size class
+    ok 307 - unexpected class size
+    ok 308 - unexpected size class
+    ok 309 - unexpected class size
+    ok 310 - unexpected size class
+    ok 311 - unexpected class size
+    ok 312 - unexpected size class
+    ok 313 - unexpected class size
+    ok 314 - unexpected size class
+    ok 315 - unexpected class size
+    ok 316 - unexpected size class
+    ok 317 - unexpected class size
+    ok 318 - unexpected size class
+    ok 319 - unexpected class size
+    ok 320 - unexpected size class
+    ok 321 - unexpected class size
+    ok 322 - unexpected size class
+    ok 323 - unexpected class size
+    ok 324 - unexpected size class
+    ok 325 - unexpected class size
+    ok 326 - unexpected size class
+    ok 327 - unexpected class size
+    ok 328 - unexpected size class
+    ok 329 - unexpected class size
+    ok 330 - unexpected size class
+    ok 331 - unexpected class size
+    ok 332 - unexpected size class
+    ok 333 - unexpected class size
+    ok 334 - unexpected size class
+    ok 335 - unexpected class size
+    ok 336 - unexpected size class
+    ok 337 - unexpected class size
+    ok 338 - unexpected size class
+    ok 339 - unexpected class size
+    ok 340 - unexpected size class
+    ok 341 - unexpected class size
+    ok 342 - unexpected size class
+    ok 343 - unexpected class size
+    ok 344 - unexpected size class
+    ok 345 - unexpected class size
+    ok 346 - unexpected size class
+    ok 347 - unexpected class size
+    ok 348 - unexpected size class
+    ok 349 - unexpected class size
+    ok 350 - unexpected size class
+    ok 351 - unexpected class size
+    ok 352 - unexpected size class
+    ok 353 - unexpected class size
+    ok 354 - unexpected size class
+    ok 355 - unexpected class size
+    ok 356 - unexpected size class
+    ok 357 - unexpected class size
+    ok 358 - unexpected size class
+    ok 359 - unexpected class size
+    ok 360 - unexpected size class
+    ok 361 - unexpected class size
+    ok 362 - unexpected size class
+    ok 363 - unexpected class size
+    ok 364 - unexpected size class
+    ok 365 - unexpected class size
+    ok 366 - unexpected size class
+    ok 367 - unexpected class size
+    ok 368 - unexpected size class
+    ok 369 - unexpected class size
+    ok 370 - unexpected size class
+    ok 371 - unexpected class size
+    ok 372 - unexpected size class
+    ok 373 - unexpected class size
+    ok 374 - unexpected size class
+    ok 375 - unexpected class size
+    ok 376 - unexpected size class
+    ok 377 - unexpected class size
+    ok 378 - unexpected size class
+    ok 379 - unexpected class size
+    ok 380 - unexpected size class
+    ok 381 - unexpected class size
+    ok 382 - unexpected size class
+    ok 383 - unexpected class size
+    ok 384 - unexpected size class
+    ok 385 - unexpected class size
+    ok 386 - unexpected size class
+    ok 387 - unexpected class size
+    ok 388 - unexpected size class
+    ok 389 - unexpected class size
+    ok 390 - unexpected size class
+    ok 391 - unexpected class size
+    ok 392 - unexpected size class
+    ok 393 - unexpected class size
+    ok 394 - unexpected size class
+    ok 395 - unexpected class size
+    ok 396 - unexpected size class
+    ok 397 - unexpected class size
+    ok 398 - unexpected size class
+    ok 399 - unexpected class size
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+    ok 7860 - unexpected class size
+    ok 7861 - unexpected size class
+    ok 7862 - unexpected class size
+    ok 7863 - unexpected size class
+    ok 7864 - unexpected class size
+    ok 7865 - unexpected size class
+    ok 7866 - unexpected class size
+    ok 7867 - unexpected size class
+    ok 7868 - unexpected class size
+    ok 7869 - unexpected size class
+    ok 7870 - unexpected class size
+    ok 7871 - unexpected size class
+    ok 7872 - unexpected class size
+    ok 7873 - unexpected size class
+    ok 7874 - unexpected class size
+    ok 7875 - unexpected size class
+    ok 7876 - unexpected class size
+    ok 7877 - unexpected size class
+    ok 7878 - unexpected class size
+    ok 7879 - unexpected size class
+    ok 7880 - unexpected class size
+    ok 7881 - unexpected size class
+    ok 7882 - unexpected class size
+    ok 7883 - unexpected size class
+    ok 7884 - unexpected class size
+    ok 7885 - unexpected size class
+    ok 7886 - unexpected class size
+    ok 7887 - unexpected size class
+    ok 7888 - unexpected class size
+    ok 7889 - unexpected size class
+    ok 7890 - unexpected class size
+    ok 7891 - unexpected size class
+    ok 7892 - unexpected class size
+    ok 7893 - unexpected size class
+    ok 7894 - unexpected class size
+    ok 7895 - unexpected size class
+    ok 7896 - unexpected class size
+    ok 7897 - unexpected size class
+    ok 7898 - unexpected class size
+    ok 7899 - unexpected size class
+    ok 7900 - unexpected class size
+    ok 7901 - unexpected size class
+    ok 7902 - unexpected class size
+    ok 7903 - unexpected size class
+    ok 7904 - unexpected class size
+    ok 7905 - unexpected size class
+    ok 7906 - unexpected class size
+    ok 7907 - unexpected size class
+    ok 7908 - unexpected class size
+    ok 7909 - unexpected size class
+    ok 7910 - unexpected class size
+    ok 7911 - unexpected size class
+    ok 7912 - unexpected class size
+    ok 7913 - unexpected size class
+    ok 7914 - unexpected class size
+    ok 7915 - unexpected size class
+    ok 7916 - unexpected class size
+    ok 7917 - unexpected size class
+    ok 7918 - unexpected class size
+    ok 7919 - unexpected size class
+    ok 7920 - unexpected class size
+    ok 7921 - unexpected size class
+    ok 7922 - unexpected class size
+    ok 7923 - unexpected size class
+    ok 7924 - unexpected class size
+    ok 7925 - unexpected size class
+    ok 7926 - unexpected class size
+    ok 7927 - unexpected size class
+    ok 7928 - unexpected class size
+    ok 7929 - unexpected size class
+    ok 7930 - unexpected class size
+    ok 7931 - unexpected size class
+    ok 7932 - unexpected class size
+    ok 7933 - unexpected size class
+    ok 7934 - unexpected class size
+    ok 7935 - unexpected size class
+    ok 7936 - unexpected class size
+    ok 7937 - unexpected size class
+    ok 7938 - unexpected class size
+    ok 7939 - unexpected size class
+    ok 7940 - unexpected class size
+    ok 7941 - unexpected size class
+    ok 7942 - unexpected class size
+    ok 7943 - unexpected size class
+    ok 7944 - unexpected class size
+    ok 7945 - unexpected size class
+    ok 7946 - unexpected class size
+    ok 7947 - unexpected size class
+    ok 7948 - unexpected class size
+    ok 7949 - unexpected size class
+    ok 7950 - unexpected class size
+    ok 7951 - unexpected size class
+    ok 7952 - unexpected class size
+    ok 7953 - unexpected size class
+    ok 7954 - unexpected class size
+    ok 7955 - unexpected size class
+    ok 7956 - unexpected class size
+    ok 7957 - unexpected size class
+    ok 7958 - unexpected class size
+    ok 7959 - unexpected size class
+    ok 7960 - unexpected class size
+    ok 7961 - unexpected size class
+    ok 7962 - unexpected class size
+    ok 7963 - unexpected size class
+    ok 7964 - unexpected class size
+    ok 7965 - unexpected size class
+    ok 7966 - unexpected class size
+    ok 7967 - unexpected size class
+    ok 7968 - unexpected class size
+    ok 7969 - unexpected size class
+    ok 7970 - unexpected class size
+    ok 7971 - unexpected size class
+    ok 7972 - unexpected class size
+    ok 7973 - unexpected size class
+    ok 7974 - unexpected class size
+    ok 7975 - unexpected size class
+    ok 7976 - unexpected class size
+    ok 7977 - unexpected size class
+    ok 7978 - unexpected class size
+    ok 7979 - unexpected size class
+    ok 7980 - unexpected class size
+    ok 7981 - unexpected size class
+    ok 7982 - unexpected class size
+    ok 7983 - unexpected size class
+    ok 7984 - unexpected class size
+    ok 7985 - unexpected size class
+    ok 7986 - unexpected class size
+    ok 7987 - unexpected size class
+    ok 7988 - unexpected class size
+    ok 7989 - unexpected size class
+    ok 7990 - unexpected class size
+    ok 7991 - unexpected size class
+    ok 7992 - unexpected class size
+    ok 7993 - unexpected size class
+    ok 7994 - unexpected class size
+    ok 7995 - unexpected size class
+    ok 7996 - unexpected class size
+    ok 7997 - unexpected size class
+    ok 7998 - unexpected class size
+    ok 7999 - unexpected size class
+    ok 8000 - unexpected class size
+    ok 8001 - unexpected size class
+    ok 8002 - unexpected class size
+    ok 8003 - unexpected size class
+    ok 8004 - unexpected class size
+    ok 8005 - unexpected size class
+    ok 8006 - unexpected class size
+    ok 8007 - unexpected size class
+    ok 8008 - unexpected class size
+    ok 8009 - unexpected size class
+    ok 8010 - unexpected class size
+    ok 8011 - unexpected size class
+    ok 8012 - unexpected class size
+    ok 8013 - unexpected size class
+    ok 8014 - unexpected class size
+    ok 8015 - unexpected size class
+    ok 8016 - unexpected class size
+    ok 8017 - unexpected size class
+    ok 8018 - unexpected class size
+    ok 8019 - unexpected size class
+    ok 8020 - unexpected class size
+    ok 8021 - unexpected size class
+    ok 8022 - unexpected class size
+    ok 8023 - unexpected size class
+    ok 8024 - unexpected class size
+    ok 8025 - unexpected size class
+    ok 8026 - unexpected class size
+    ok 8027 - unexpected size class
+    ok 8028 - unexpected class size
+    ok 8029 - unexpected size class
+    ok 8030 - unexpected class size
+    ok 8031 - unexpected size class
+    ok 8032 - unexpected class size
+    ok 8033 - unexpected size class
+    ok 8034 - unexpected class size
+    ok 8035 - unexpected size class
+    ok 8036 - unexpected class size
+    ok 8037 - unexpected size class
+    ok 8038 - unexpected class size
+    ok 8039 - unexpected size class
+    ok 8040 - unexpected class size
+    ok 8041 - unexpected size class
+    ok 8042 - unexpected class size
+    ok 8043 - unexpected size class
+    ok 8044 - unexpected class size
+    ok 8045 - unexpected size class
+    ok 8046 - unexpected class size
+    ok 8047 - unexpected size class
+    ok 8048 - unexpected class size
+    ok 8049 - unexpected size class
+    ok 8050 - unexpected class size
+    ok 8051 - unexpected size class
+    ok 8052 - unexpected class size
+    ok 8053 - unexpected size class
+    ok 8054 - unexpected class size
+    ok 8055 - unexpected size class
+    ok 8056 - unexpected class size
+    ok 8057 - unexpected size class
+    ok 8058 - unexpected class size
+    ok 8059 - unexpected size class
+    ok 8060 - unexpected class size
+    ok 8061 - unexpected size class
+    ok 8062 - unexpected class size
+    ok 8063 - unexpected size class
+    ok 8064 - unexpected class size
+    ok 8065 - unexpected size class
+    ok 8066 - unexpected class size
+    ok 8067 - unexpected size class
+    ok 8068 - unexpected class size
+    ok 8069 - unexpected size class
+    ok 8070 - unexpected class size
+    ok 8071 - unexpected size class
+    ok 8072 - unexpected class size
+    ok 8073 - unexpected size class
+    ok 8074 - unexpected class size
+    ok 8075 - unexpected size class
+    ok 8076 - unexpected class size
+    ok 8077 - unexpected size class
+    ok 8078 - unexpected class size
+    ok 8079 - unexpected size class
+    ok 8080 - unexpected class size
+    ok 8081 - unexpected size class
+    ok 8082 - unexpected class size
+    ok 8083 - unexpected size class
+    ok 8084 - unexpected class size
+    ok 8085 - unexpected size class
+    ok 8086 - unexpected class size
+    ok 8087 - unexpected size class
+    ok 8088 - unexpected class size
+    ok 8089 - unexpected size class
+    ok 8090 - unexpected class size
+    ok 8091 - unexpected size class
+    ok 8092 - unexpected class size
+    ok 8093 - unexpected size class
+    ok 8094 - unexpected class size
+    ok 8095 - unexpected size class
+    ok 8096 - unexpected class size
+    ok 8097 - unexpected size class
+    ok 8098 - unexpected class size
+    ok 8099 - unexpected size class
+    ok 8100 - unexpected class size
+    ok 8101 - unexpected size class
+    ok 8102 - unexpected class size
+    ok 8103 - unexpected size class
+    ok 8104 - unexpected class size
+    ok 8105 - unexpected size class
+    ok 8106 - unexpected class size
+    ok 8107 - unexpected size class
+    ok 8108 - unexpected class size
+    ok 8109 - unexpected size class
+    ok 8110 - unexpected class size
+    ok 8111 - unexpected size class
+    ok 8112 - unexpected class size
+    ok 8113 - unexpected size class
+    ok 8114 - unexpected class size
+    ok 8115 - unexpected size class
+    ok 8116 - unexpected class size
+    ok 8117 - unexpected size class
+    ok 8118 - unexpected class size
+    ok 8119 - unexpected size class
+    ok 8120 - unexpected class size
+    ok 8121 - unexpected size class
+    ok 8122 - unexpected class size
+    ok 8123 - unexpected size class
+    ok 8124 - unexpected class size
+    ok 8125 - unexpected size class
+    ok 8126 - unexpected class size
+    ok 8127 - unexpected size class
+    ok 8128 - unexpected class size
+    ok 8129 - unexpected size class
+    ok 8130 - unexpected class size
+    ok 8131 - unexpected size class
+    ok 8132 - unexpected class size
+    ok 8133 - unexpected size class
+    ok 8134 - unexpected class size
+    ok 8135 - unexpected size class
+    ok 8136 - unexpected class size
+    ok 8137 - unexpected size class
+    ok 8138 - unexpected class size
+    ok 8139 - unexpected size class
+    ok 8140 - unexpected class size
+    ok 8141 - unexpected size class
+    ok 8142 - unexpected class size
+    ok 8143 - unexpected size class
+    ok 8144 - unexpected class size
+    ok 8145 - unexpected size class
+    ok 8146 - unexpected class size
+    ok 8147 - unexpected size class
+    ok 8148 - unexpected class size
+    ok 8149 - unexpected size class
+    ok 8150 - unexpected class size
+    ok 8151 - unexpected size class
+    ok 8152 - unexpected class size
+    ok 8153 - unexpected size class
+    ok 8154 - unexpected class size
+    ok 8155 - unexpected size class
+    ok 8156 - unexpected class size
+    ok 8157 - unexpected size class
+    ok 8158 - unexpected class size
+    ok 8159 - unexpected size class
+    ok 8160 - unexpected class size
+    ok 8161 - unexpected size class
+    ok 8162 - unexpected class size
+    ok 8163 - unexpected size class
+    ok 8164 - unexpected class size
+    ok 8165 - unexpected size class
+    ok 8166 - unexpected class size
+    ok 8167 - unexpected size class
+    ok 8168 - unexpected class size
+    ok 8169 - unexpected size class
+    ok 8170 - unexpected class size
+    ok 8171 - unexpected size class
+    ok 8172 - unexpected class size
+    ok 8173 - unexpected size class
+    ok 8174 - unexpected class size
+    ok 8175 - unexpected size class
+    ok 8176 - unexpected class size
+    ok 8177 - unexpected size class
+    ok 8178 - unexpected class size
+    ok 8179 - unexpected size class
+    ok 8180 - unexpected class size
+    ok 8181 - unexpected size class
+    ok 8182 - unexpected class size
+    ok 8183 - unexpected size class
+    ok 8184 - unexpected class size
+    ok 8185 - unexpected size class
+    ok 8186 - unexpected class size
+    ok 8187 - unexpected size class
+    ok 8188 - unexpected class size
+    ok 8189 - unexpected size class
+    ok 8190 - unexpected class size
+    ok 8191 - unexpected size class
+    ok 8192 - unexpected class size
+    ok 8193 - unexpected size class
+    ok 8194 - unexpected class size
+    ok 8195 - unexpected size class
+    ok 8196 - unexpected class size
+    ok 8197 - unexpected size class
+    ok 8198 - unexpected class size
+    ok 8199 - unexpected size class
+    ok 8200 - unexpected class size
+    ok 8201 - unexpected size class
+    ok 8202 - unexpected class size
+    ok 8203 - unexpected size class
+    ok 8204 - unexpected class size
+ok 2 - subtests
+	*** check_expectation: done ***
+	*** check_factor ***
+    1..792
+    ok 1 - wrong actual factor (1)
+    ok 2 - wrong actual factor (1)
+    ok 3 - wrong approximation (1)
+    ok 4 - wrong approximation (2)
+    ok 5 - wrong actual factor (1)
+    ok 6 - wrong actual factor (1)
+    ok 7 - wrong approximation (1)
+    ok 8 - wrong approximation (2)
+    ok 9 - wrong actual factor (1)
+    ok 10 - wrong actual factor (1)
+    ok 11 - wrong approximation (1)
+    ok 12 - wrong approximation (2)
+    ok 13 - wrong actual factor (1)
+    ok 14 - wrong actual factor (1)
+    ok 15 - wrong approximation (1)
+    ok 16 - wrong approximation (2)
+    ok 17 - wrong actual factor (1)
+    ok 18 - wrong actual factor (1)
+    ok 19 - wrong approximation (1)
+    ok 20 - wrong approximation (2)
+    ok 21 - wrong actual factor (1)
+    ok 22 - wrong actual factor (1)
+    ok 23 - wrong approximation (1)
+    ok 24 - wrong approximation (2)
+    ok 25 - wrong actual factor (1)
+    ok 26 - wrong actual factor (1)
+    ok 27 - wrong approximation (1)
+    ok 28 - wrong approximation (2)
+    ok 29 - wrong actual factor (1)
+    ok 30 - wrong actual factor (1)
+    ok 31 - wrong approximation (1)
+    ok 32 - wrong approximation (2)
+    ok 33 - wrong actual factor (1)
+    ok 34 - wrong actual factor (1)
+    ok 35 - wrong approximation (1)
+    ok 36 - wrong approximation (2)
+    ok 37 - wrong actual factor (1)
+    ok 38 - wrong actual factor (1)
+    ok 39 - wrong approximation (1)
+    ok 40 - wrong approximation (2)
+    ok 41 - wrong actual factor (1)
+    ok 42 - wrong actual factor (1)
+    ok 43 - wrong approximation (1)
+    ok 44 - wrong approximation (2)
+    ok 45 - wrong actual factor (1)
+    ok 46 - wrong actual factor (1)
+    ok 47 - wrong approximation (1)
+    ok 48 - wrong approximation (2)
+    ok 49 - wrong actual factor (1)
+    ok 50 - wrong actual factor (1)
+    ok 51 - wrong approximation (1)
+    ok 52 - wrong approximation (2)
+    ok 53 - wrong actual factor (1)
+    ok 54 - wrong actual factor (1)
+    ok 55 - wrong approximation (1)
+    ok 56 - wrong approximation (2)
+    ok 57 - wrong actual factor (1)
+    ok 58 - wrong actual factor (1)
+    ok 59 - wrong approximation (1)
+    ok 60 - wrong approximation (2)
+    ok 61 - wrong actual factor (1)
+    ok 62 - wrong actual factor (1)
+    ok 63 - wrong approximation (1)
+    ok 64 - wrong approximation (2)
+    ok 65 - wrong actual factor (1)
+    ok 66 - wrong actual factor (1)
+    ok 67 - wrong approximation (1)
+    ok 68 - wrong approximation (2)
+    ok 69 - wrong actual factor (1)
+    ok 70 - wrong actual factor (1)
+    ok 71 - wrong approximation (1)
+    ok 72 - wrong approximation (2)
+    ok 73 - wrong actual factor (1)
+    ok 74 - wrong actual factor (1)
+    ok 75 - wrong approximation (1)
+    ok 76 - wrong approximation (2)
+    ok 77 - wrong actual factor (1)
+    ok 78 - wrong actual factor (1)
+    ok 79 - wrong approximation (1)
+    ok 80 - wrong approximation (2)
+    ok 81 - wrong actual factor (1)
+    ok 82 - wrong actual factor (1)
+    ok 83 - wrong approximation (1)
+    ok 84 - wrong approximation (2)
+    ok 85 - wrong actual factor (1)
+    ok 86 - wrong actual factor (1)
+    ok 87 - wrong approximation (1)
+    ok 88 - wrong approximation (2)
+    ok 89 - wrong actual factor (1)
+    ok 90 - wrong actual factor (1)
+    ok 91 - wrong approximation (1)
+    ok 92 - wrong approximation (2)
+    ok 93 - wrong actual factor (1)
+    ok 94 - wrong actual factor (1)
+    ok 95 - wrong approximation (1)
+    ok 96 - wrong approximation (2)
+    ok 97 - wrong actual factor (1)
+    ok 98 - wrong actual factor (1)
+    ok 99 - wrong approximation (1)
+    ok 100 - wrong approximation (2)
+    ok 101 - wrong actual factor (1)
+    ok 102 - wrong actual factor (1)
+    ok 103 - wrong approximation (1)
+    ok 104 - wrong approximation (2)
+    ok 105 - wrong actual factor (1)
+    ok 106 - wrong actual factor (1)
+    ok 107 - wrong approximation (1)
+    ok 108 - wrong approximation (2)
+    ok 109 - wrong actual factor (1)
+    ok 110 - wrong actual factor (1)
+    ok 111 - wrong approximation (1)
+    ok 112 - wrong approximation (2)
+    ok 113 - wrong actual factor (1)
+    ok 114 - wrong actual factor (1)
+    ok 115 - wrong approximation (1)
+    ok 116 - wrong approximation (2)
+    ok 117 - wrong actual factor (1)
+    ok 118 - wrong actual factor (1)
+    ok 119 - wrong approximation (1)
+    ok 120 - wrong approximation (2)
+    ok 121 - wrong actual factor (1)
+    ok 122 - wrong actual factor (1)
+    ok 123 - wrong approximation (1)
+    ok 124 - wrong approximation (2)
+    ok 125 - wrong actual factor (1)
+    ok 126 - wrong actual factor (1)
+    ok 127 - wrong approximation (1)
+    ok 128 - wrong approximation (2)
+    ok 129 - wrong actual factor (1)
+    ok 130 - wrong actual factor (1)
+    ok 131 - wrong approximation (1)
+    ok 132 - wrong approximation (2)
+    ok 133 - wrong actual factor (1)
+    ok 134 - wrong actual factor (1)
+    ok 135 - wrong approximation (1)
+    ok 136 - wrong approximation (2)
+    ok 137 - wrong actual factor (1)
+    ok 138 - wrong actual factor (1)
+    ok 139 - wrong approximation (1)
+    ok 140 - wrong approximation (2)
+    ok 141 - wrong actual factor (1)
+    ok 142 - wrong actual factor (1)
+    ok 143 - wrong approximation (1)
+    ok 144 - wrong approximation (2)
+    ok 145 - wrong actual factor (1)
+    ok 146 - wrong actual factor (1)
+    ok 147 - wrong approximation (1)
+    ok 148 - wrong approximation (2)
+    ok 149 - wrong actual factor (1)
+    ok 150 - wrong actual factor (1)
+    ok 151 - wrong approximation (1)
+    ok 152 - wrong approximation (2)
+    ok 153 - wrong actual factor (1)
+    ok 154 - wrong actual factor (1)
+    ok 155 - wrong approximation (1)
+    ok 156 - wrong approximation (2)
+    ok 157 - wrong actual factor (1)
+    ok 158 - wrong actual factor (1)
+    ok 159 - wrong approximation (1)
+    ok 160 - wrong approximation (2)
+    ok 161 - wrong actual factor (1)
+    ok 162 - wrong actual factor (1)
+    ok 163 - wrong approximation (1)
+    ok 164 - wrong approximation (2)
+    ok 165 - wrong actual factor (1)
+    ok 166 - wrong actual factor (1)
+    ok 167 - wrong approximation (1)
+    ok 168 - wrong approximation (2)
+    ok 169 - wrong actual factor (1)
+    ok 170 - wrong actual factor (1)
+    ok 171 - wrong approximation (1)
+    ok 172 - wrong approximation (2)
+    ok 173 - wrong actual factor (1)
+    ok 174 - wrong actual factor (1)
+    ok 175 - wrong approximation (1)
+    ok 176 - wrong approximation (2)
+    ok 177 - wrong actual factor (1)
+    ok 178 - wrong actual factor (1)
+    ok 179 - wrong approximation (1)
+    ok 180 - wrong approximation (2)
+    ok 181 - wrong actual factor (1)
+    ok 182 - wrong actual factor (1)
+    ok 183 - wrong approximation (1)
+    ok 184 - wrong approximation (2)
+    ok 185 - wrong actual factor (1)
+    ok 186 - wrong actual factor (1)
+    ok 187 - wrong approximation (1)
+    ok 188 - wrong approximation (2)
+    ok 189 - wrong actual factor (1)
+    ok 190 - wrong actual factor (1)
+    ok 191 - wrong approximation (1)
+    ok 192 - wrong approximation (2)
+    ok 193 - wrong actual factor (1)
+    ok 194 - wrong actual factor (1)
+    ok 195 - wrong approximation (1)
+    ok 196 - wrong approximation (2)
+    ok 197 - wrong actual factor (1)
+    ok 198 - wrong actual factor (1)
+    ok 199 - wrong approximation (1)
+    ok 200 - wrong approximation (2)
+    ok 201 - wrong actual factor (1)
+    ok 202 - wrong actual factor (1)
+    ok 203 - wrong approximation (1)
+    ok 204 - wrong approximation (2)
+    ok 205 - wrong actual factor (1)
+    ok 206 - wrong actual factor (1)
+    ok 207 - wrong approximation (1)
+    ok 208 - wrong approximation (2)
+    ok 209 - wrong actual factor (1)
+    ok 210 - wrong actual factor (1)
+    ok 211 - wrong approximation (1)
+    ok 212 - wrong approximation (2)
+    ok 213 - wrong actual factor (1)
+    ok 214 - wrong actual factor (1)
+    ok 215 - wrong approximation (1)
+    ok 216 - wrong approximation (2)
+    ok 217 - wrong actual factor (1)
+    ok 218 - wrong actual factor (1)
+    ok 219 - wrong approximation (1)
+    ok 220 - wrong approximation (2)
+    ok 221 - wrong actual factor (1)
+    ok 222 - wrong actual factor (1)
+    ok 223 - wrong approximation (1)
+    ok 224 - wrong approximation (2)
+    ok 225 - wrong actual factor (1)
+    ok 226 - wrong actual factor (1)
+    ok 227 - wrong approximation (1)
+    ok 228 - wrong approximation (2)
+    ok 229 - wrong actual factor (1)
+    ok 230 - wrong actual factor (1)
+    ok 231 - wrong approximation (1)
+    ok 232 - wrong approximation (2)
+    ok 233 - wrong actual factor (1)
+    ok 234 - wrong actual factor (1)
+    ok 235 - wrong approximation (1)
+    ok 236 - wrong approximation (2)
+    ok 237 - wrong actual factor (1)
+    ok 238 - wrong actual factor (1)
+    ok 239 - wrong approximation (1)
+    ok 240 - wrong approximation (2)
+    ok 241 - wrong actual factor (1)
+    ok 242 - wrong actual factor (1)
+    ok 243 - wrong approximation (1)
+    ok 244 - wrong approximation (2)
+    ok 245 - wrong actual factor (1)
+    ok 246 - wrong actual factor (1)
+    ok 247 - wrong approximation (1)
+    ok 248 - wrong approximation (2)
+    ok 249 - wrong actual factor (1)
+    ok 250 - wrong actual factor (1)
+    ok 251 - wrong approximation (1)
+    ok 252 - wrong approximation (2)
+    ok 253 - wrong actual factor (1)
+    ok 254 - wrong actual factor (1)
+    ok 255 - wrong approximation (1)
+    ok 256 - wrong approximation (2)
+    ok 257 - wrong actual factor (1)
+    ok 258 - wrong actual factor (1)
+    ok 259 - wrong approximation (1)
+    ok 260 - wrong approximation (2)
+    ok 261 - wrong actual factor (1)
+    ok 262 - wrong actual factor (1)
+    ok 263 - wrong approximation (1)
+    ok 264 - wrong approximation (2)
+    ok 265 - wrong actual factor (1)
+    ok 266 - wrong actual factor (1)
+    ok 267 - wrong approximation (1)
+    ok 268 - wrong approximation (2)
+    ok 269 - wrong actual factor (1)
+    ok 270 - wrong actual factor (1)
+    ok 271 - wrong approximation (1)
+    ok 272 - wrong approximation (2)
+    ok 273 - wrong actual factor (1)
+    ok 274 - wrong actual factor (1)
+    ok 275 - wrong approximation (1)
+    ok 276 - wrong approximation (2)
+    ok 277 - wrong actual factor (1)
+    ok 278 - wrong actual factor (1)
+    ok 279 - wrong approximation (1)
+    ok 280 - wrong approximation (2)
+    ok 281 - wrong actual factor (1)
+    ok 282 - wrong actual factor (1)
+    ok 283 - wrong approximation (1)
+    ok 284 - wrong approximation (2)
+    ok 285 - wrong actual factor (1)
+    ok 286 - wrong actual factor (1)
+    ok 287 - wrong approximation (1)
+    ok 288 - wrong approximation (2)
+    ok 289 - wrong actual factor (1)
+    ok 290 - wrong actual factor (1)
+    ok 291 - wrong approximation (1)
+    ok 292 - wrong approximation (2)
+    ok 293 - wrong actual factor (1)
+    ok 294 - wrong actual factor (1)
+    ok 295 - wrong approximation (1)
+    ok 296 - wrong approximation (2)
+    ok 297 - wrong actual factor (1)
+    ok 298 - wrong actual factor (1)
+    ok 299 - wrong approximation (1)
+    ok 300 - wrong approximation (2)
+    ok 301 - wrong actual factor (1)
+    ok 302 - wrong actual factor (1)
+    ok 303 - wrong approximation (1)
+    ok 304 - wrong approximation (2)
+    ok 305 - wrong actual factor (1)
+    ok 306 - wrong actual factor (1)
+    ok 307 - wrong approximation (1)
+    ok 308 - wrong approximation (2)
+    ok 309 - wrong actual factor (1)
+    ok 310 - wrong actual factor (1)
+    ok 311 - wrong approximation (1)
+    ok 312 - wrong approximation (2)
+    ok 313 - wrong actual factor (1)
+    ok 314 - wrong actual factor (1)
+    ok 315 - wrong approximation (1)
+    ok 316 - wrong approximation (2)
+    ok 317 - wrong actual factor (1)
+    ok 318 - wrong actual factor (1)
+    ok 319 - wrong approximation (1)
+    ok 320 - wrong approximation (2)
+    ok 321 - wrong actual factor (1)
+    ok 322 - wrong actual factor (1)
+    ok 323 - wrong approximation (1)
+    ok 324 - wrong approximation (2)
+    ok 325 - wrong actual factor (1)
+    ok 326 - wrong actual factor (1)
+    ok 327 - wrong approximation (1)
+    ok 328 - wrong approximation (2)
+    ok 329 - wrong actual factor (1)
+    ok 330 - wrong actual factor (1)
+    ok 331 - wrong approximation (1)
+    ok 332 - wrong approximation (2)
+    ok 333 - wrong actual factor (1)
+    ok 334 - wrong actual factor (1)
+    ok 335 - wrong approximation (1)
+    ok 336 - wrong approximation (2)
+    ok 337 - wrong actual factor (1)
+    ok 338 - wrong actual factor (1)
+    ok 339 - wrong approximation (1)
+    ok 340 - wrong approximation (2)
+    ok 341 - wrong actual factor (1)
+    ok 342 - wrong actual factor (1)
+    ok 343 - wrong approximation (1)
+    ok 344 - wrong approximation (2)
+    ok 345 - wrong actual factor (1)
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+ok 3 - subtests
+	*** check_factor: done ***
+	*** main: done ***
-- 
2.20.1

