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* [Bug tree-optimization/24333] missed div optimizations [not found] <bug-24333-4@http.gcc.gnu.org/bugzilla/> @ 2011-06-22 21:57 ` pluto at agmk dot net 2021-09-02 0:24 ` gabravier at gmail dot com 1 sibling, 0 replies; 5+ messages in thread From: pluto at agmk dot net @ 2011-06-22 21:57 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24333 --- Comment #7 from Pawel Sikora <pluto at agmk dot net> 2011-06-22 21:56:27 UTC --- 4.6 still affected: f: movl %edi, %edx movl %edi, %eax sarl $31, %edx idivl %edi ret ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/24333] missed div optimizations [not found] <bug-24333-4@http.gcc.gnu.org/bugzilla/> 2011-06-22 21:57 ` [Bug tree-optimization/24333] missed div optimizations pluto at agmk dot net @ 2021-09-02 0:24 ` gabravier at gmail dot com 1 sibling, 0 replies; 5+ messages in thread From: gabravier at gmail dot com @ 2021-09-02 0:24 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24333 Gabriel Ravier <gabravier at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |gabravier at gmail dot com --- Comment #8 from Gabriel Ravier <gabravier at gmail dot com> --- Seems to be fixed since GCC 7 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/24333] New: missed div optimizations?
@ 2005-10-12 15:39 pluto at agmk dot net
2005-12-30 18:33 ` [Bug tree-optimization/24333] missed div optimizations pinskia at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: pluto at agmk dot net @ 2005-10-12 15:39 UTC (permalink / raw)
To: gcc-bugs
unsigned foo(const unsigned x) { return (x / x); }
double bar(const double x) { return (x / x); }
$ gcc -Wall -O2 -mregparm=3 -fomit-frame-pointer tmp.c -S
foo: xorl %edx, %edx
divl %eax
ret
bar: fldl 4(%esp)
fdiv %st(0), %st
ret
I think optimizer should return 1 for both cases.
--
Summary: missed div optimizations?
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pluto at agmk dot net
GCC build triplet: i686-pld-linux
GCC host triplet: i686-pld-linux
GCC target triplet: i686-pld-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24333
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug tree-optimization/24333] missed div optimizations 2005-10-12 15:39 [Bug tree-optimization/24333] New: missed div optimizations? pluto at agmk dot net @ 2005-12-30 18:33 ` pinskia at gcc dot gnu dot org 2006-04-08 1:41 ` pinskia at gcc dot gnu dot org 2007-03-19 9:15 ` pluto at agmk dot net 2 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-12-30 18:33 UTC (permalink / raw) To: gcc-bugs ------- Comment #4 from pinskia at gcc dot gnu dot org 2005-12-30 18:33 ------- Confirmed. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Keywords| |missed-optimization Last reconfirmed|0000-00-00 00:00:00 |2005-12-30 18:33:47 date| | Summary|missed div optimizations? |missed div optimizations http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24333 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/24333] missed div optimizations 2005-10-12 15:39 [Bug tree-optimization/24333] New: missed div optimizations? pluto at agmk dot net 2005-12-30 18:33 ` [Bug tree-optimization/24333] missed div optimizations pinskia at gcc dot gnu dot org @ 2006-04-08 1:41 ` pinskia at gcc dot gnu dot org 2007-03-19 9:15 ` pluto at agmk dot net 2 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2006-04-08 1:41 UTC (permalink / raw) To: gcc-bugs ------- Comment #5 from pinskia at gcc dot gnu dot org 2006-04-08 01:41 ------- x/x is done for fp now. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24333 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/24333] missed div optimizations 2005-10-12 15:39 [Bug tree-optimization/24333] New: missed div optimizations? pluto at agmk dot net 2005-12-30 18:33 ` [Bug tree-optimization/24333] missed div optimizations pinskia at gcc dot gnu dot org 2006-04-08 1:41 ` pinskia at gcc dot gnu dot org @ 2007-03-19 9:15 ` pluto at agmk dot net 2 siblings, 0 replies; 5+ messages in thread From: pluto at agmk dot net @ 2007-03-19 9:15 UTC (permalink / raw) To: gcc-bugs ------- Comment #6 from pluto at agmk dot net 2007-03-19 09:15 ------- `int f( int x ) { return x / x; }' still not optimized on 4.2/4.3 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24333 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-09-02 0:24 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-24333-4@http.gcc.gnu.org/bugzilla/>
2011-06-22 21:57 ` [Bug tree-optimization/24333] missed div optimizations pluto at agmk dot net
2021-09-02 0:24 ` gabravier at gmail dot com
2005-10-12 15:39 [Bug tree-optimization/24333] New: missed div optimizations? pluto at agmk dot net
2005-12-30 18:33 ` [Bug tree-optimization/24333] missed div optimizations pinskia at gcc dot gnu dot org
2006-04-08 1:41 ` pinskia at gcc dot gnu dot org
2007-03-19 9:15 ` pluto at agmk dot net
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