[Bug other/31170] New: cmpxchgq not emitted.

[pluto at agmk dot net]

long emit_cmpxchg( long volatile* p, long from, long to )
{
        long v = *p;
        if ( v == from )
                *p = to;
        return v;
}

gcc should be able to optimize this.


-- 
           Summary: cmpxchgq not emitted.
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pluto at agmk dot net
GCC target triplet: x86_64-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31170