https://bugs.kde.org/show_bug.cgi?id=416667
--- Comment #3 from Carl Love <c...@us.ibm.com> ---
Julian:
I hadn't thought to try different optimizations. I can reproduce the issue for
the mfvsrd test only with no optimizations. No errors are reported with -O1,
-O2 and -O3 optimization levels.
$GCC_INSTALL/bin/gcc -c valgrind-bug.c
valgrind-bug.c: In function ‘test_mfvsrd’:
valgrind-bug.c:19:4: error: impossible constraint in ‘asm’
19 | __asm__ __volatile__ ("mfvsrd %0,%x1" : "=r" (r14) : "ws"
(vec_inA));
| ^~~~~~~
$GCC_INSTALL/bin/gcc -O0 -c valgrind-bug.c
valgrind-bug.c: In function ‘test_mfvsrd’:
valgrind-bug.c:19:4: error: impossible constraint in ‘asm’
19 | __asm__ __volatile__ ("mfvsrd %0,%x1" : "=r" (r14) : "ws"
(vec_inA));
| ^~~~~~~
~/Valgrind$ $GCC_INSTALL/bin/gcc -O1 -c valgrind-bug.c
~/Valgrind$ $GCC_INSTALL/bin/gcc -O2 -c valgrind-bug.c
~/Valgrind$ $GCC_INSTALL/bin/gcc -O3 -c valgrind-bug.c
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