https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92637
--- Comment #3 from John Dong <dongjianqiang2 at huawei dot com> --- (In reply to Andrew Pinski from comment #1) > > 214: aa0a03e0 mov x0, x10 // HERE x10 is > > overwriten by glibc > > > Hmm, GCC knows that find_next_zero_bit will not clobber x10 so it uses > across the call of that. This is due to -fipa-ra . > > glibc should not be involved in the call to find_next_zero_bit either. > > If the ld.so is clobbering registers, then the bug is there I think. > > Also I doubt -ftree-coalesce-vars is the issue but rather exposing the issue > with -fipa-ra. > > Does using -fno-ipa-ra fix the issue? yes, using -fno-ipa-ra fix the issue.
