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[Bug tree-optimization/33761] tree-copyrename and tree-dominators pessimizes gzip SPEC score
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 6 Sep 2008 15:26:36 -0000
- Subject: [Bug tree-optimization/33761] tree-copyrename and tree-dominators pessimizes gzip SPEC score
- References: <bug-33761-1649@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #28 from ubizjak at gmail dot com 2008-09-06 15:26 -------
(In reply to comment #27)
> Also just noticed that offline copy of longest-match get extra move:
> .L15:
> movzbl 2(%eax), %edi #, tmp87
> leal 2(%eax), %ecx #, scan.158
> movl %edi, %edx # tmp87,
> cmpb 2(%ebx), %dl #,
> jne .L6 #,
>
> interesting :)
Perhaps due to ineffective regmove (similar to PR 37364)?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33761