https://bugs.kde.org/show_bug.cgi?id=399287
Bug ID: 399287
Summary: Illegal Instruction vcmptrueps
Product: valgrind
Version: 3.13.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: dww...@gmail.com
Target Milestone: ---
Created attachment 115345
--> https://bugs.kde.org/attachment.cgi?id=115345&action=edit
Small C program illustrating the problem
SUMMARY
Using Valgrind 3.13, Valgrind is failing with an illegal instruction error.
The instruction is vcmptrueps, which can be manually created with the
_mm_cmp_ps() intrinsic. (Documentation:
https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmp_ps&expand=719,719&techs=AVX)
I have attached a small program that reproduces the problem.
We see the problem with Clang 5.0.1 and GCC 7.3. (It seems that different
versions interpret this intrinsic differently, so YMMV.) If I have the compiler
output the assembly (-s flag), the vcmptrueps instruction doesn't show up. If I
attach to the vgdb server and look at the highlighted instruction when valgrind
sends the SIGILL signal, then it shows up. I'm not sure why they are different.
I'm not an expert, I'm afraid.
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