[LLVM][LoongArch] X86SnippetRepetitorTest.Loop test fails #149616
Description
On a Loongson 3C6000 machine with a NixOS installation, X86SnippetRepetitorTest.Loop test consistently fails when compiling LLVM 19/20. The failure is currently mitigated downstream by loongson-community/nixpkgs@c860c2b and the superseding NixOS/nixpkgs#426088.
Attached is the relevant error log.
FAIL: LLVM-Unit :: tools/llvm-exegesis/./LLVMExegesisTests/21/35 (57237 of 58466)
******************** TEST 'LLVM-Unit :: tools/llvm-exegesis/./LLVMExegesisTests/21/35' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/build/llvm-src-20.1.6/llvm/build/unittests/tools/llvm-exegesis/./LLVMExegesisTests-LLVM-Unit-18270-21-35.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=35 GTEST_SHARD_INDEX=21 /build/llvm-src-20.1.6/llvm/build/unittests/tools/llvm-exegesis/./LLVMExegesisTests
--
Script:
--
/build/llvm-src-20.1.6/llvm/build/unittests/tools/llvm-exegesis/./LLVMExegesisTests --gtest_filter=X86SnippetRepetitorTest.Loop
--
/build/llvm-src-20.1.6/llvm/unittests/tools/llvm-exegesis/X86/SnippetRepetitorTest.cpp:104: Failure
Value of: LoopBlock.liveins()
Expected: has 2 elements and there exists some permutation of elements such that:
- element #0 is an object whose given field is equal to 22, and
- element #1 is an object whose given field is equal to 0
Actual: 16-byte object <50-86 E4-23 01-00 00-00 70-86 E4-23 01-00 00-00>, where the following matchers don't match any elements:
matcher #1: is an object whose given field is equal to 0
and where the following elements don't match any matchers:
element #0: 16-byte object <77-00 00-00 01-00 00-00 FF-FF FF-FF FF-FF FF-FF>
/build/llvm-src-20.1.6/llvm/unittests/tools/llvm-exegesis/X86/SnippetRepetitorTest.cpp:104
Value of: LoopBlock.liveins()
Expected: has 2 elements and there exists some permutation of elements such that:
- element #0 is an object whose given field is equal to 22, and
- element #1 is an object whose given field is equal to 0
Actual: 16-byte object <50-86 E4-23 01-00 00-00 70-86 E4-23 01-00 00-00>, where the following matchers don't match any elements:
matcher #1: is an object whose given field is equal to 0
and where the following elements don't match any matchers:
element #0: 16-byte object <77-00 00-00 01-00 00-00 FF-FF FF-FF FF-FF FF-FF>
********************