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* [Bug optimization/15348] New: [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0.
@ 2004-05-09 19:30 kazu at cs dot umass dot edu
  2004-05-09 19:32 ` [Bug optimization/15348] " kazu at cs dot umass dot edu
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: kazu at cs dot umass dot edu @ 2004-05-09 19:30 UTC (permalink / raw)
  To: gcc-bugs

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


^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Bug optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0.
  2004-05-09 19:30 [Bug optimization/15348] New: [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0 kazu at cs dot umass dot edu
@ 2004-05-09 19:32 ` kazu at cs dot umass dot edu
  2004-05-09 19:41 ` pinskia at gcc dot gnu dot org
                   ` (2 subsequent siblings)
  3 siblings, 0 replies; 5+ messages in thread
From: kazu at cs dot umass dot edu @ 2004-05-09 19:32 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From kazu at cs dot umass dot edu  2004-05-09 19:32 -------
Another one just like above:

void bar (void);

void
foo (int a, int b)
{
  if (a != 0)
    return;
  if (b != 0)
    return;
  bar ();
}

void
baz (int a, int b)
{
  if ((a | b) == 0)
    bar ();
}

See also PR 15241.


-- 


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


^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Bug optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0.
  2004-05-09 19:30 [Bug optimization/15348] New: [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0 kazu at cs dot umass dot edu
  2004-05-09 19:32 ` [Bug optimization/15348] " kazu at cs dot umass dot edu
@ 2004-05-09 19:41 ` pinskia at gcc dot gnu dot org
  2004-05-09 22:11 ` pinskia at gcc dot gnu dot org
  2004-05-25  0:09 ` [Bug tree-optimization/15348] " pinskia at gcc dot gnu dot org
  3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-05-09 19:41 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From pinskia at gcc dot gnu dot org  2004-05-09 19:41 -------
Confirmed.  

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-05-09 19:41:56
               date|                            |
   Target Milestone|---                         |tree-ssa


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


^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Bug optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0.
  2004-05-09 19:30 [Bug optimization/15348] New: [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0 kazu at cs dot umass dot edu
  2004-05-09 19:32 ` [Bug optimization/15348] " kazu at cs dot umass dot edu
  2004-05-09 19:41 ` pinskia at gcc dot gnu dot org
@ 2004-05-09 22:11 ` pinskia at gcc dot gnu dot org
  2004-05-25  0:09 ` [Bug tree-optimization/15348] " pinskia at gcc dot gnu dot org
  3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-05-09 22:11 UTC (permalink / raw)
  To: gcc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |15357


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


^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Bug tree-optimization/15348] [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0.
  2004-05-09 19:30 [Bug optimization/15348] New: [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0 kazu at cs dot umass dot edu
                   ` (2 preceding siblings ...)
  2004-05-09 22:11 ` pinskia at gcc dot gnu dot org
@ 2004-05-25  0:09 ` pinskia at gcc dot gnu dot org
  3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-05-25  0:09 UTC (permalink / raw)
  To: gcc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.5.0                       |---


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


^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2004-05-24  1:56 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2004-05-09 19:30 [Bug optimization/15348] New: [tree-ssa] Convert (x < 0) || (y < 0) into (x | y) < 0 kazu at cs dot umass dot edu
2004-05-09 19:32 ` [Bug optimization/15348] " kazu at cs dot umass dot edu
2004-05-09 19:41 ` pinskia at gcc dot gnu dot org
2004-05-09 22:11 ` pinskia at gcc dot gnu dot org
2004-05-25  0:09 ` [Bug tree-optimization/15348] " pinskia at gcc dot gnu dot org

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