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* [Bug middle-end/32279] New: Fold 1.0/sqrt(x/y) to sqrt(y/x)
@ 2007-06-10 21:46 rguenth at gcc dot gnu dot org
2007-06-11 6:36 ` [Bug middle-end/32279] " ubizjak at gmail dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2007-06-10 21:46 UTC (permalink / raw)
To: gcc-bugs
This may even work for -funsafe-math-optimizations only (we round differently).
One has to enumerate all interesting cases (mainly x == 0) and see if NaN/Inf
are properly preserved in all cases.
--
Summary: Fold 1.0/sqrt(x/y) to sqrt(y/x)
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rguenth at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32279
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug middle-end/32279] Fold 1.0/sqrt(x/y) to sqrt(y/x) 2007-06-10 21:46 [Bug middle-end/32279] New: Fold 1.0/sqrt(x/y) to sqrt(y/x) rguenth at gcc dot gnu dot org @ 2007-06-11 6:36 ` ubizjak at gmail dot com 2007-06-11 9:09 ` uros at gcc dot gnu dot org 2007-06-11 9:11 ` ubizjak at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: ubizjak at gmail dot com @ 2007-06-11 6:36 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from ubizjak at gmail dot com 2007-06-11 06:36 ------- Patch at http://gcc.gnu.org/ml/gcc-patches/2007-06/msg00655.html Patch was also checked with 0.0, __builtin_inf and __builtin_nan, and the results were the same as for unpatched gcc for all combinations that were thrown in. -- ubizjak at gmail dot com changed: What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|unassigned at gcc dot gnu |ubizjak at gmail dot com |dot org | URL| |http://gcc.gnu.org/ml/gcc- | |patches/2007- | |06/msg00655.html Status|UNCONFIRMED |ASSIGNED Ever Confirmed|0 |1 Keywords| |patch Last reconfirmed|0000-00-00 00:00:00 |2007-06-11 06:36:21 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32279 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/32279] Fold 1.0/sqrt(x/y) to sqrt(y/x) 2007-06-10 21:46 [Bug middle-end/32279] New: Fold 1.0/sqrt(x/y) to sqrt(y/x) rguenth at gcc dot gnu dot org 2007-06-11 6:36 ` [Bug middle-end/32279] " ubizjak at gmail dot com @ 2007-06-11 9:09 ` uros at gcc dot gnu dot org 2007-06-11 9:11 ` ubizjak at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: uros at gcc dot gnu dot org @ 2007-06-11 9:09 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from uros at gcc dot gnu dot org 2007-06-11 09:09 ------- Subject: Bug 32279 Author: uros Date: Mon Jun 11 09:09:24 2007 New Revision: 125614 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=125614 Log: PR middle-end/32279 * fold-const (fold_binary) [RDIV_EXPR]: Optimize a/sqrt(b/c) into a*sqrt(c/b) if flag_unsafe_math_optimizations is set. testsuite/ChangeLog: PR middle-end/32279 * gcc.dg/builtins-11.c: Also check folding of a/sqrt(b/c). Modified: trunk/gcc/ChangeLog trunk/gcc/fold-const.c trunk/gcc/testsuite/ChangeLog trunk/gcc/testsuite/gcc.dg/builtins-11.c -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32279 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/32279] Fold 1.0/sqrt(x/y) to sqrt(y/x) 2007-06-10 21:46 [Bug middle-end/32279] New: Fold 1.0/sqrt(x/y) to sqrt(y/x) rguenth at gcc dot gnu dot org 2007-06-11 6:36 ` [Bug middle-end/32279] " ubizjak at gmail dot com 2007-06-11 9:09 ` uros at gcc dot gnu dot org @ 2007-06-11 9:11 ` ubizjak at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: ubizjak at gmail dot com @ 2007-06-11 9:11 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from ubizjak at gmail dot com 2007-06-11 09:11 ------- Fixed. -- ubizjak at gmail dot com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution| |FIXED Target Milestone|--- |4.3.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32279 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2007-06-11 9:11 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2007-06-10 21:46 [Bug middle-end/32279] New: Fold 1.0/sqrt(x/y) to sqrt(y/x) rguenth at gcc dot gnu dot org 2007-06-11 6:36 ` [Bug middle-end/32279] " ubizjak at gmail dot com 2007-06-11 9:09 ` uros at gcc dot gnu dot org 2007-06-11 9:11 ` ubizjak at gmail dot com
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