[Bug target/18154] New: Inefficient max/min code for PowerPC

[dje at gcc dot gnu dot org]

int min(int a, int b) {
  if (a < b)
    return a;
  else
    return b;
}

should produce

        rlwinm  r2,r3,1,31,31
        subfc   r0,r4,r3
        rlwinm  r0,r4,1,31,31
        subfe   r0,r2,r0
        andc    r2,r4,r0
        and     r0,r3,r0
        or      r3,r0,r2
        blr

but instead produces a branch sequence

         mr r0,r3
         mr r3,r4
         cmpw cr7,r0,r4
         bgelr- cr7
         mr r3,r0
         blr

with unnecessary dependencies.

-- 
           Summary: Inefficient max/min code for PowerPC
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dje at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: *-*-*
  GCC host triplet: powerpc-*-*
GCC target triplet: *-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18154