[Bug rtl-optimization/20291] New: combine throws away clobbers before tying to split

[Bug rtl-optimization/20291] New: combine throws away clobbers before tying to split

[amylaar at gcc dot gnu dot org]

When recog_for_combine fails to recognize a pattern as-is, it re-tries
with the clobbers stripped away.  When it eventually fails, and the
caller try_combine tries to split the pattern, the clobbers are
gone, thus causing combine failures for bridge splitters that need
these clobbers.

patch is here:
http://gcc.gnu.org/ml/gcc-patches/2005-03/msg00177.html

-- 
           Summary: combine throws away clobbers before tying to split
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P2
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: amylaar at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
OtherBugsDependingO 17652
             nThis:


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20291

[Bug rtl-optimization/20291] combine throws away clobbers before tying to split

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-03-02 21:47:58
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20291

[Bug rtl-optimization/20291] combine throws away clobbers before trying to split

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-03-15 12:39 -------
Subject: Bug 20291

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	amylaar@gcc.gnu.org	2005-03-15 12:39:06

Modified files:
	gcc            : ChangeLog combine.c 

Log message:
	PR rtl-optimization/20291
	* combine.c (try_combine): If splitting fails, re-try with
	original combined pattern, i.e. before clobber stripping.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.7857&r2=2.7858
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/combine.c.diff?cvsroot=gcc&r1=1.479&r2=1.480



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20291

[Bug rtl-optimization/20291] combine throws away clobbers before trying to split

[amylaar at gcc dot gnu dot org]

------- Additional Comments From amylaar at gcc dot gnu dot org  2005-03-15 14:07 -------
Fixed in mainline with patch applied today.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20291

[Bug rtl-optimization/20291] combine throws away clobbers before trying to split

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20291