https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112707
--- Comment #6 from Christopher Fore <csfore at posteo dot net> --- The original example in the wild was with -mcpu=7450 -O2 -maltivec -mabi=altivec -pipe, plus the flags the build system added, then I minimised it to the attachment above, where I only needed: -O3 -ffast-math.