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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/33761] non-optimal inlining heuristics pessimizes gzip SPEC score at -O3
Date: Wed, 06 Feb 2008 19:11:00 -0000 [thread overview]
Message-ID: <20080206191031.3149.qmail@sourceware.org> (raw)
In-Reply-To: <bug-33761-1649@http.gcc.gnu.org/bugzilla/>
------- Comment #21 from ubizjak at gmail dot com 2008-02-06 19:10 -------
(In reply to comment #20)
> Since -fo-f-p adds another free reg, it looks that since inlining increases
> register pressure some unlucky heavy-used variable gets allocated to the stack
> slot.
It is "best_len" (and probably some others, too):
[uros@localhost gzip-1.2.4]$ grep best_len fp.s
movl %edx, -68(%ebp) #, best_len
movl -68(%ebp), %edx # best_len, best_len.494
movl %edx, -68(%ebp) # best_len.494, best_len
movl -68(%ebp), %edx # best_len,
movl -68(%ebp), %edx # best_len,
movl -68(%ebp), %edx # best_len, best_len.494
cmpl %esi, %edx # lookahead, best_len.494
movl %edx, -108(%ebp) # best_len.494, match_length
movl -68(%ebp), %edx # best_len, best_len.494
movl %edx, -88(%ebp) # prev_length.28, best_len
movl -88(%ebp), %edx # best_len, best_len.457
movl %edx, -88(%ebp) # best_len.457, best_len
movl -88(%ebp), %eax # best_len,
movl -88(%ebp), %edx # best_len,
movl -88(%ebp), %edx # best_len, best_len.457
cmpl %esi, %edx # lookahead, best_len.457
movl %edx, -40(%ebp) # best_len.457, match_length.404
movl -88(%ebp), %edx # best_len, best_len.457
leal (%ecx,%eax), %edx #, best_len.457
cmpl %edx, -88(%ebp) # best_len.457, best_len
cmpl -96(%ebp), %edx # nice_match.34, best_len.457
leal (%ecx,%eax), %edx #, best_len.494
cmpl %edx, -68(%ebp) # best_len.494, best_len
cmpl -76(%ebp), %edx # nice_match.34, best_len.494
[uros@localhost gzip-1.2.4]$ grep best_len no-fp.s
movl %edx, 76(%esp) #, best_len
movl 76(%esp), %edx # best_len,
movl 76(%esp), %edx # best_len, best_len.494
movl %edx, 76(%esp) # best_len.494, best_len
movl 76(%esp), %eax # best_len,
movl 76(%esp), %edx # best_len, best_len.494
movl %edx, %ebp # best_len.494, match_length
movl 76(%esp), %edx # best_len, best_len.494
movl %edx, %ebp # prev_length.28, best_len
movl %ebp, %edx # best_len, best_len.457
movl %edx, %ebp # best_len.457, best_len
movl %ebp, %edx # best_len, best_len.457
cmpl %esi, %edx # lookahead, best_len.457
movl %ebp, %edx # best_len, best_len.457
leal (%ecx,%eax), %edx #, best_len.494
cmpl %edx, 76(%esp) # best_len.494, best_len
cmpl 68(%esp), %edx # nice_match.34, best_len.494
leal (%ecx,%eax), %edx #, best_len.457
cmpl %edx, %ebp # best_len.457, best_len
cmpl 52(%esp), %edx # nice_match.34, best_len.457
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33761
next prev parent reply other threads:[~2008-02-06 19:11 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-13 11:27 [Bug target/33761] New: " ubizjak at gmail dot com
2007-10-13 12:31 ` [Bug target/33761] " rguenth at gcc dot gnu dot org
2007-12-10 10:14 ` [Bug target/33761] [4.3 regression] " ubizjak at gmail dot com
2007-12-10 10:52 ` [Bug tree-optimization/33761] " rguenth at gcc dot gnu dot org
2007-12-10 12:31 ` ubizjak at gmail dot com
2007-12-10 17:12 ` ubizjak at gmail dot com
2007-12-10 17:14 ` rguenther at suse dot de
2007-12-10 17:26 ` ubizjak at gmail dot com
2007-12-11 6:00 ` [Bug tree-optimization/33761] [4.3 regression] " ubizjak at gmail dot com
2007-12-11 6:09 ` steven at gcc dot gnu dot org
2007-12-11 6:17 ` ubizjak at gmail dot com
2008-01-16 17:40 ` [Bug tree-optimization/33761] " hubicka at gcc dot gnu dot org
2008-02-02 16:23 ` hubicka at gcc dot gnu dot org
2008-02-03 13:40 ` hubicka at gcc dot gnu dot org
2008-02-03 17:35 ` ubizjak at gmail dot com
2008-02-05 13:37 ` hubicka at gcc dot gnu dot org
2008-02-05 13:56 ` hubicka at gcc dot gnu dot org
2008-02-06 13:29 ` hubicka at gcc dot gnu dot org
2008-02-06 16:45 ` hubicka at gcc dot gnu dot org
2008-02-06 16:57 ` hubicka at gcc dot gnu dot org
2008-02-06 18:43 ` ubizjak at gmail dot com
2008-02-06 19:11 ` ubizjak at gmail dot com [this message]
2008-02-06 19:22 ` hubicka at gcc dot gnu dot org
2008-02-07 12:31 ` hubicka at gcc dot gnu dot org
2008-02-08 15:12 ` hubicka at gcc dot gnu dot org
2008-02-08 15:40 ` hubicka at gcc dot gnu dot org
2008-09-06 12:01 ` hubicka at gcc dot gnu dot org
2008-09-06 12:04 ` hubicka at gcc dot gnu dot org
2008-09-06 15:27 ` [Bug tree-optimization/33761] tree-copyrename and tree-dominators pessimizes gzip SPEC score ubizjak at gmail dot com
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