[PATCH] D99815: [CSSPGO][Test] XFAIL profile-context-tracker-debug.ll on AIX
Hongtao Yu via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Apr 12 15:05:53 PDT 2021
hoy added a comment.
In D99815#2684221 <https://reviews.llvm.org/D99815#2684221>, @jsji wrote:
> In D99815#2684210 <https://reviews.llvm.org/D99815#2684210>, @hoy wrote:
>
>> In D99815#2683075 <https://reviews.llvm.org/D99815#2683075>, @jsji wrote:
>>
>>> So this is not only failing for AIX, it is actually depends on the libc++ implementation. It may fail on Linux if using non default libc++ .
>>>
>>> Any plan of fixing the code to not using std::hash<std::string> ? Thanks. @hoy
>>
>> Thanks for pointing it out. Yes, we think that may be related to libstdc++ function `_Hash_bytes`. My plan is to tweak the test with Check-DAG since the promoting order of the children should not cause codegen diffs. We could also sort the children by names instead of hash value for a more stable order across platforms, but that''ll likely incur more overhead. What do you think?
>>
>> namespace std
>> {
>> _GLIBCXX_BEGIN_NAMESPACE_VERSION
>>
>> // Hash function implementation for the nontrivial specialization.
>> // All of them are based on a primitive that hashes a pointer to a
>> // byte array. The actual hash algorithm is not guaranteed to stay
>> // the same from release to release -- it may be updated or tuned to
>> // improve hash quality or speed.
>> size_t
>> _Hash_bytes(const void* __ptr, size_t __len, size_t __seed);
>
> Thanks, I am OK with tweaking test with check-DAG as long as you can confirm that this is safe in codegen ( I am not familiar with these code enough to judge).
Thanks. Do you still have the output of the failing test? That'll help to tweak the test.
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