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From: "kazu at cs dot umass dot edu" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug optimization/6585] Redundant store/load instruction pairs on ix86 Date: Wed, 17 Mar 2004 08:03:00 -0000 [thread overview] Message-ID: <20040317080342.29785.qmail@sources.redhat.com> (raw) In-Reply-To: <20020506130600.6585.bruno@clisp.org> ------- Additional Comments From kazu at cs dot umass dot edu 2004-03-17 08:03 ------- With -O3 -fnew-ra -march=i686 -mtune=i686 -fomit-frame-pointer, I get: mul: subl $20, %esp movl %esi, 12(%esp) ; save %esi movl 24(%esp), %eax movl 32(%esp), %esi movl 28(%esp), %ecx movl %edi, 16(%esp) ; save %edi movl 36(%esp), %edi movl %eax, (%esp) mull %esi movl %ecx, 4(%esp) movl %ebx, 8(%esp) movl %eax, %ecx movl (%esp), %eax imull %eax, %edi movl 4(%esp), %eax imull %esi, %eax movl 12(%esp), %esi ; restore %esi leal (%edx,%edi), %edi leal (%edi,%eax), %ebx movl 16(%esp), %edi ; restore %edi movl %ecx, %eax movl %ebx, %edx movl 8(%esp), %ebx ; restore %ebx addl $20, %esp ret Note that those "why not" instructions are gone. "USELESS" instructions are gone even without -fnew-ra as of today's mainline. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=6585
next prev parent reply other threads:[~2004-03-17 8:03 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20020506130600.6585.bruno@clisp.org> 2003-07-04 11:09 ` [Bug optimization/6585] useless memory store instructions on x86 steven at gcc dot gnu dot org 2003-07-10 20:09 ` [Bug optimization/6585] Reduntant store/load instruction pairs on ix86 steven at gcc dot gnu dot org 2003-08-23 1:38 ` [Bug optimization/6585] Redundant " dhazeghi at yahoo dot com 2003-11-25 7:51 ` pinskia at gcc dot gnu dot org 2004-03-17 8:03 ` kazu at cs dot umass dot edu [this message] 2004-03-17 12:10 ` bruno at clisp dot org 2004-10-11 2:57 ` [Bug rtl-optimization/6585] " pinskia at gcc dot gnu dot org 2004-10-11 11:55 ` bruno at clisp dot org 2005-06-26 13:35 ` steven at gcc dot gnu dot org 2005-06-27 11:50 ` bruno at clisp dot org
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