[Bug tree-optimization/42216] New: [4.5 Regression] 464.h265ref peak regressed 20%

[rguenth at gcc dot gnu dot org]

See http://gcc.opensuse.org/SPEC/CINT/sb-balakirew-head-64-2006/recent.html

First bad rev. is 154713, last good is 154686.

It's quite obvious that either the regrename.c changes have code generation
differences or that removing the vec_interleave_* expanders caused this
regression.

Richard - you removed all vec_interleave_* expanders but the vectorizer
still checks for optab_for_tree_code (VEC_INTERLEAVE_*_EXPR) which ends
up looking at vec_interleave_*_optab.  Either this code is all dead now
or you caused the vectorization no longer to apply.

I'll check if reverting your revision gets back performance.


-- 
           Summary: [4.5 Regression] 464.h265ref peak regressed 20%
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42216