[Bug optimization/15348] New: [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0.

["kazu at cs dot umass dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

Convert foo() into baz().

void bar (void);

int
foo (int x, int y)
{
  int t1 = x < 0;
  int t2 = y < 0;
  return t1 || t2;
}

int
baz (int x, int y)
{
  return (x | y) < 0;
}

Needless to mention, we should do this fairly late in SSA optimizations.

-- 
           Summary: [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0.
           Product: gcc
           Version: tree-ssa
            Status: UNCONFIRMED
          Keywords: pessimizes-code
          Severity: enhancement
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kazu at cs dot umass dot edu
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15348