https://bugs.kde.org/show_bug.cgi?id=463458
Bug ID: 463458
Summary: memcheck/tests/vcpu_fnfns fails when glibc is built
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).
Presumably, something in the instructions enabled by that target (AVX, AVX2,
BMI1, BMI2, F16C, FMA, LZCNT, MOVBE, XSAVE) distorts the floating point results
slightly in libm math functions:
memcheck/tests/vcpu_fnfns.stdout.diff
************
--- vcpu_fnfns.stdout.exp 2018-03-09 12:34:56.000000000 +0000
+++ vcpu_fnfns.stdout.out 2022-12-25 14:43:29.195000000 +0000
@@ -305,7 +305,7 @@
cosF( -3.0170e-01) = +9.5483e-01
cosF( -2.0180e-01) = +9.7971e-01
cosF( -1.0190e-01) = +9.9481e-01
- cosF( -1.9999e-03) = +1.0000e-00
+ cosF( -1.9999e-03) = +1.0000e+00
cosF( +9.7900e-02) = +9.9521e-01
cosF( +1.9780e-01) = +9.8050e-01
cosF( +2.9770e-01) = +9.5601e-01
@@ -536,7 +536,7 @@
logD(+9.9999999900000e-02) = -2.3025850939940e+00
logD(+1.9999999980000e-01) = -1.6094379134341e+00
logD(+2.9999999970000e-01) = -1.2039728053259e+00
- logD(+3.9999999960000e-01) = -9.1629073287415e-01
+ logD(+3.9999999960000e-01) = -9.1629073287416e-01
logD(+4.9999999950000e-01) = -6.9314718155995e-01
logD(+5.9999999940000e-01) = -5.1082562476599e-01
logD(+6.9999999930000e-01) = -3.5667494493873e-01
More detailed information about the feature level targets in gcc is here:
https://www.phoronix.com/news/GCC-11-x86-64-Feature-Levels
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