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

amylaar at gcc dot gnu dot org gcc-bugzilla@gcc.gnu.org
Wed Mar 2 21:43:00 GMT 2005


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



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