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From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/34027] [4.3 regression] -Os code size nearly doubled
Date: Mon, 12 Nov 2007 15:01:00 -0000	[thread overview]
Message-ID: <20071112150115.15418.qmail@sourceware.org> (raw)
In-Reply-To: <bug-34027-9876@http.gcc.gnu.org/bugzilla/>



------- Comment #10 from rguenth at gcc dot gnu dot org  2007-11-12 15:01 -------
of course in the -O2 case I forgot to paste the rest of the fn in, here it is:

        .p2align 4,,7
        .p2align 3
.L5:
        addl    $-1000000000, %eax
        adcl    $-1, %edx
        movl    $1000000000, 8(%esp)
        movl    $0, 12(%esp)
        movl    %eax, (%esp)
        movl    %edx, 4(%esp)
        call    __umoddi3
        leave
        ret

so unfortunately the expanders don't deal with modulus the same way as with
the div/mul sequence.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34027


      parent reply	other threads:[~2007-11-12 15:01 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-11-08 11:39 [Bug c/34027] New: " bunk at stusta dot de
2007-11-08 21:45 ` [Bug tree-optimization/34027] " rguenth at gcc dot gnu dot org
2007-11-09 12:15 ` jakub at gcc dot gnu dot org
2007-11-09 12:20 ` rguenther at suse dot de
2007-11-09 12:30 ` jakub at gcc dot gnu dot org
2007-11-09 12:37 ` rguenther at suse dot de
2007-11-10  7:58 ` bunk at stusta dot de
2007-11-10 23:54 ` rguenth at gcc dot gnu dot org
2007-11-12 13:24 ` rguenth at gcc dot gnu dot org
2007-11-12 13:28 ` rguenth at gcc dot gnu dot org
2007-11-12 15:01 ` rguenth at gcc dot gnu dot org [this message]

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