[Tarantool-patches] [PATCH luajit] test: add test for conversions folding

[Sergey Kaplun via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

This patch adds the test for commit
1a401622fe83ae695226c94df3416e312315d659 ("Fix assertions."). This patch
removes incorrect assertions in the fold optimizations for conversions
from numbers to different integer types. Although the issue affects only
branch 2.0, there is no need to fix it. Nevertheless, the test is
required to avoid regressions in the future.

Part of tarantool/tarantool#9145
---

Branch: https://github.com/tarantool/luajit/tree/skaplun/lj-833-fold-conv-from-num
Tarantool PR: https://github.com/tarantool/tarantool/pull/9375
Related issues:
* https://github.com/LuaJIT/LuaJIT/issues/833
* https://github.com/tarantool/tarantool/issues/9145

 .../lj-833-fold-conv-from-num.test.lua        | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 test/tarantool-tests/lj-833-fold-conv-from-num.test.lua

diff --git a/test/tarantool-tests/lj-833-fold-conv-from-num.test.lua b/test/tarantool-tests/lj-833-fold-conv-from-num.test.lua
new file mode 100644
index 00000000..9e2059bd
--- /dev/null
+++ b/test/tarantool-tests/lj-833-fold-conv-from-num.test.lua
@@ -0,0 +1,33 @@
+local tap = require('tap')
+
+-- XXX: Test the behaviour of fold optimizations from numbers to
+-- different integer types. The test itself doesn't fail before
+-- the commit since these changes relate only to version 2.0.
+
+local test = tap.test('lj-833-fold-conv-from-num'):skipcond({
+  ['Test requires JIT enabled'] = not jit.status(),
+})
+
+local ffi = require('ffi')
+
+test:plan(3)
+
+local arr_i64 = ffi.new('int64_t  [2]')
+local arr_u64 = ffi.new('uint64_t [2]')
+local arr_u32 = ffi.new('uint32_t [2]')
+
+jit.opt.start('hotloop=1')
+
+for _ = 1, 4 do
+  -- Test conversion to type (at store). Also, check the
+  -- conversion from number to int64_t at C array indexing.
+  arr_i64[1.1] = 1.1
+  arr_u64[1.1] = 1.1
+  arr_u32[1.1] = 1.1
+end
+
+test:is(arr_i64[1], 1LL,  'correct conversion to int64_t')
+test:is(arr_u64[1], 1ULL, 'correct conversion to uint64_t')
+test:is(arr_u32[1], 1ULL, 'correct conversion to uint32_t')
+
+test:done(true)
-- 
2.42.0