https://bugs.kde.org/show_bug.cgi?id=440906
Bug ID: 440906
Summary: powerpc valgrind testsuite; update
test_isa_3_1_common.c to avoid modulo against hard
regs
Product: valgrind
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: will_schm...@vnet.ibm.com
Target Milestone: ---
SUMMARY
Due to a GCC issue (PR101882) seen against recent GCC builds, we
want to rework our code to avoid attempting a modulo operation
with both the input and output defined as a hard register.
ra is earlier defined as
register uint64_t ra __asm__ ("r20");
and current code attempts a
ra = ra % 9;
In this case, we can apply the modulo operation to the args[] array
value that was previously used to initialize the ra value.
ra = args[vrai] % 9;
Patch attached.
STEPS TO REPRODUCE
1. Build valgrind for power9 or power10 using a recent (~ Aug 2021) GCC.
2. See "impossible constraint" error emitted from GCC.
3.
OBSERVED RESULT
EXPECTED RESULT
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
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