[Bug tree-optimization/20657] New: VRP does not get rid of a redundant "if" statement.

[Bug tree-optimization/20657] New: VRP does not get rid of a redundant "if" statement.

[kazu at cs dot umass dot edu]

Consider

int
foo (int a)
{
  if (a == 0)
    if (a == 0)
      return 1;
  return 0;
}

Note that the second "if" statement is redundant.

-- 
           Summary: VRP does not get rid of a redundant "if" statement.
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P2
         Component: tree-optimization
        AssignedTo: kazu at cs dot umass dot edu
        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=20657

[Bug tree-optimization/20657] [tcb] VRP does not get rid of a redundant "if" statement.

[kazu at cs dot umass dot edu]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|VRP does not get rid of a   |[tcb] VRP does not get rid
                   |redundant "if" statement.   |of a redundant "if"
                   |                            |statement.


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20657

[Bug tree-optimization/20657] [tcb] VRP does not get rid of a redundant "if" statement.

[kazu at cs dot umass dot edu]

------- Additional Comments From kazu at cs dot umass dot edu  2005-03-27 19:42 -------
Created an attachment (id=8462)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8462&action=view)
Patch


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20657

[Bug tree-optimization/20657] [tcb] VRP does not get rid of a redundant "if" statement.

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-03-27 22:35 -------
Confirmed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-03-27 22:35:28
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20657

[Bug tree-optimization/20657] [tcb] VRP does not get rid of a redundant "if" statement.

[kazu at cs dot umass dot edu]

------- Additional Comments From kazu at cs dot umass dot edu  2005-04-14 13:07 -------
Patch posted:
http://gcc.gnu.org/ml/gcc-patches/2005-04/msg01577.html

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20657

[Bug tree-optimization/20657] [tcb] VRP does not get rid of a redundant "if" statement.

[kazu at cs dot umass dot edu]

------- Additional Comments From kazu at cs dot umass dot edu  2005-04-14 13:35 -------
Just checked in a patch.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20657

[Bug tree-optimization/20657] [tcb] VRP does not get rid of a redundant "if" statement.

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-04-14 13:36 -------
Subject: Bug 20657

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	kazu@gcc.gnu.org	2005-04-14 13:34:59

Modified files:
	gcc            : ChangeLog tree-vrp.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/gcc.dg/tree-ssa: pr20657.c 

Log message:
	gcc/
	PR tree-optimization/20657
	* tree-vrp.c (extract_range_from_expr): Notice INTEGER_CST to
	create an appropriate range from it.
	
	testsuite/
	PR tree-optimization/20657
	* gcc.dg/tree-ssa/pr20657.c: New.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.8286&r2=2.8287
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-vrp.c.diff?cvsroot=gcc&r1=2.6&r2=2.7
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.5346&r2=1.5347
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/tree-ssa/pr20657.c.diff?cvsroot=gcc&r1=NONE&r2=1.1



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20657