Hi, Sergey,

thanks for the patch! LGTM

If the `foo()` function itself starts to be recorded on the very first
call, it leads to the changing of TNEW bytecode when table bump
optimization is enabled. This patch skips the test for this type of
build.
---

Branch: https://github.com/tarantool/luajit/tree/skaplun/fix-luajit-tests-tablebump

 test/LuaJIT-tests/CMakeLists.txt      | 8 ++++++++
 test/LuaJIT-tests/lib/string/dump.lua | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/test/LuaJIT-tests/CMakeLists.txt b/test/LuaJIT-tests/CMakeLists.txt
index 019762e0..d29bcb6e 100644
--- a/test/LuaJIT-tests/CMakeLists.txt
+++ b/test/LuaJIT-tests/CMakeLists.txt
@@ -62,6 +62,14 @@ if(CMAKE_C_FLAGS MATCHES "-march=skylake-avx512")
   list(APPEND LUAJIT_TEST_TAGS_EXTRA +avx512)
 endif()
 
+if(LUAJIT_ENABLE_TABLE_BUMP)
+  # Test <string/dump.lua> verifies that the bytecode is unchanged
+  # for the prototype with the recorded trace. Table bump
+  # optimization changes the TNEW/TDUP bytecodes, so skip the test
+  # in that case.
+  list(APPEND LUAJIT_TEST_TAGS_EXTRA +table_bump)
+endif()
+
 set(TEST_SUITE_NAME "LuaJIT-tests")
 
 # XXX: The call produces both test and target <LuaJIT-tests-deps>
diff --git a/test/LuaJIT-tests/lib/string/dump.lua b/test/LuaJIT-tests/lib/string/dump.lua
index 216c6eb8..9c29ac50 100644
--- a/test/LuaJIT-tests/lib/string/dump.lua
+++ b/test/LuaJIT-tests/lib/string/dump.lua
@@ -1,6 +1,6 @@
 local loadstring = loadstring or load
 
-do --- Must unpatch modified bytecode with ILOOP/JLOOP etc.
+do --- Must unpatch modified bytecode with ILOOP/JLOOP etc. -table_bump
   local function foo()
     local t = {}
     for i=1,100 do t[i] = i end