https://bugs.kde.org/show_bug.cgi?id=463456
Bug ID: 463456
Summary: memcheck/tests/origin6-fp fails when building for
x86-64-v3 target
Classification: Developer tools
Product: valgrind
Version: 3.20.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Yocto project is transitioning x86_64 builds to build for x86-64-v3 (e.g.
enabling AVX, AVX2, BMI1, BMI2, F16C, FMA, LZCNT, MOVBE, XSAVE), and one of the
regressions is in memcheck/tests/origin6-fp.
Specifically:
Correct output for x86-64-v2:
root@qemux86-64:~/origin6-test# gcc -march=x86-64-v2 -g -O origin6-fp.c
root@qemux86-64:~/origin6-test# valgrind -q --track-origins=yes ./a.out
==19942== Conditional jump or move depends on uninitialised value(s)
==19942== at 0x1094A0: main (origin6-fp.c:97)
==19942== Uninitialised value was created by a client request
==19942== at 0x109409: setup_arr (origin6-fp.c:75)
==19942== by 0x109467: main (origin6-fp.c:87)
==19942==
Test succeeded.
Incorrect output for v3 (missing the uninitialized value bit):
root@qemux86-64:~/origin6-test# gcc -march=x86-64-v3 -g -O origin6-fp.c
root@qemux86-64:~/origin6-test# valgrind -q --track-origins=yes ./a.out
==19948== Conditional jump or move depends on uninitialised value(s)
==19948== at 0x1094A0: main (origin6-fp.c:97)
==19948==
Test succeeded.
The more detailed information about the levels is here:
https://www.phoronix.com/news/GCC-11-x86-64-Feature-Levels
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