https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103069
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |NEW
--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
nptl/nptl_setxid.c in glibc has
do
{
flags = THREAD_GETMEM (self, cancelhandling);
newval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
flags & ~SETXID_BITMASK, flags);
}
while (flags != newval);
GCC 12 generates:
899f0: 64 8b 14 25 08 03 00 mov %fs:0x308,%edx
899f8: 89 d6 mov %edx,%esi
899fa: 89 d0 mov %edx,%eax
899fc: 83 e6 bf and $0xffffffbf,%esi
899ff: f0 0f b1 31 lock cmpxchg %esi,(%rcx)
89a03: 75 eb jne 899f0
<__GI___nptl_setxid_sighand
ler+0x90>
