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* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
[not found] <bug-43419-4@http.gcc.gnu.org/bugzilla/>
@ 2014-02-16 13:18 ` jackie.rosen at hushmail dot com
0 siblings, 0 replies; 11+ messages in thread
From: jackie.rosen at hushmail dot com @ 2014-02-16 13:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
Jackie Rosen <jackie.rosen at hushmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jackie.rosen at hushmail dot com
--- Comment #10 from Jackie Rosen <jackie.rosen at hushmail dot com> ---
*** Bug 260998 has been marked as a duplicate of this bug. ***
Seen from the domain http://volichat.com
Page where seen: http://volichat.com/adult-chat-rooms
Marked for reference. Resolved as fixed @bugzilla.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
` (8 preceding siblings ...)
2010-03-22 16:02 ` mikpe at it dot uu dot se
@ 2010-03-25 16:18 ` hjl dot tools at gmail dot com
9 siblings, 0 replies; 11+ messages in thread
From: hjl dot tools at gmail dot com @ 2010-03-25 16:18 UTC (permalink / raw)
To: gcc-bugs
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |4.3.4
Known to work| |4.4.4 4.5.0
Target Milestone|--- |4.5.0
Version|unknown |4.5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
` (7 preceding siblings ...)
2010-03-22 14:58 ` jakub at gcc dot gnu dot org
@ 2010-03-22 16:02 ` mikpe at it dot uu dot se
2010-03-25 16:18 ` hjl dot tools at gmail dot com
9 siblings, 0 replies; 11+ messages in thread
From: mikpe at it dot uu dot se @ 2010-03-22 16:02 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from mikpe at it dot uu dot se 2010-03-22 16:02 -------
This bug also affects 4.3 branch. The upstream patch applies Ok and fixes it.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
` (6 preceding siblings ...)
2010-03-18 16:48 ` matz at gcc dot gnu dot org
@ 2010-03-22 14:58 ` jakub at gcc dot gnu dot org
2010-03-22 16:02 ` mikpe at it dot uu dot se
2010-03-25 16:18 ` hjl dot tools at gmail dot com
9 siblings, 0 replies; 11+ messages in thread
From: jakub at gcc dot gnu dot org @ 2010-03-22 14:58 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from jakub at gcc dot gnu dot org 2010-03-22 14:58 -------
Subject: Bug 43419
Author: jakub
Date: Mon Mar 22 14:58:00 2010
New Revision: 157631
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=157631
Log:
Backport from mainline:
2010-03-18 Michael Matz <matz@suse.de>
PR middle-end/43419
* builtins.c (expand_builtin_pow): Don't transform pow(x, 0.5)
into sqrt(x) if we need to preserve signed zeros.
* gcc.dg/pr43419.c: New testcase.
Added:
branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/pr43419.c
Modified:
branches/gcc-4_4-branch/gcc/ChangeLog
branches/gcc-4_4-branch/gcc/builtins.c
branches/gcc-4_4-branch/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
` (5 preceding siblings ...)
2010-03-18 16:08 ` matz at gcc dot gnu dot org
@ 2010-03-18 16:48 ` matz at gcc dot gnu dot org
2010-03-22 14:58 ` jakub at gcc dot gnu dot org
` (2 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: matz at gcc dot gnu dot org @ 2010-03-18 16:48 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from matz at gcc dot gnu dot org 2010-03-18 16:47 -------
Fixed.
--
matz at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
` (4 preceding siblings ...)
2010-03-18 15:31 ` rguenth at gcc dot gnu dot org
@ 2010-03-18 16:08 ` matz at gcc dot gnu dot org
2010-03-18 16:48 ` matz at gcc dot gnu dot org
` (3 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: matz at gcc dot gnu dot org @ 2010-03-18 16:08 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from matz at gcc dot gnu dot org 2010-03-18 16:08 -------
Subject: Bug 43419
Author: matz
Date: Thu Mar 18 16:07:53 2010
New Revision: 157543
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=157543
Log:
PR middle-end/43419
* builtins.c (expand_builtin_pow): Don't transform pow(x, 0.5)
into sqrt(x) if we need to preserve signed zeros.
testsuite/
* gcc.dg/pr43419.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/pr43419.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/builtins.c
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
` (3 preceding siblings ...)
2010-03-18 14:49 ` matz at gcc dot gnu dot org
@ 2010-03-18 15:31 ` rguenth at gcc dot gnu dot org
2010-03-18 16:08 ` matz at gcc dot gnu dot org
` (4 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-03-18 15:31 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from rguenth at gcc dot gnu dot org 2010-03-18 15:31 -------
Looks like we need to guard this with HONOR_SIGNED_ZEROS.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
` (2 preceding siblings ...)
2010-03-18 14:42 ` dominiq at lps dot ens dot fr
@ 2010-03-18 14:49 ` matz at gcc dot gnu dot org
2010-03-18 15:31 ` rguenth at gcc dot gnu dot org
` (5 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: matz at gcc dot gnu dot org @ 2010-03-18 14:49 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from matz at gcc dot gnu dot org 2010-03-18 14:48 -------
I checked, and these and similar transformations are always guarded by
flag_unsafe_math_optimizations, so we should be fine, unless I missed a case
of course. If you notice one, please create a bug report.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
2010-03-18 14:33 ` [Bug middle-end/43419] " vincent at vinc17 dot org
2010-03-18 14:35 ` matz at gcc dot gnu dot org
@ 2010-03-18 14:42 ` dominiq at lps dot ens dot fr
2010-03-18 14:49 ` matz at gcc dot gnu dot org
` (6 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: dominiq at lps dot ens dot fr @ 2010-03-18 14:42 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from dominiq at lps dot ens dot fr 2010-03-18 14:41 -------
While you are looking at this part, you may have to check that a similar
problem does not exist when converting x*sqrt(x) to pow(w,1.5) and so on.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
2010-03-18 14:33 ` [Bug middle-end/43419] " vincent at vinc17 dot org
@ 2010-03-18 14:35 ` matz at gcc dot gnu dot org
2010-03-18 14:42 ` dominiq at lps dot ens dot fr
` (7 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: matz at gcc dot gnu dot org @ 2010-03-18 14:35 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from matz at gcc dot gnu dot org 2010-03-18 14:35 -------
Mine.
--
matz at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |matz at gcc dot gnu dot org
|dot org |
Status|UNCONFIRMED |ASSIGNED
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2010-03-18 14:35:38
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
@ 2010-03-18 14:33 ` vincent at vinc17 dot org
2010-03-18 14:35 ` matz at gcc dot gnu dot org
` (8 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: vincent at vinc17 dot org @ 2010-03-18 14:33 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from vincent at vinc17 dot org 2010-03-18 14:33 -------
If I understand correctly, the bug appears with:
r119248 | rguenth | 2006-11-27 12:38:42 +0100 (Mon, 27 Nov 2006) | 10 lines
2006-11-27 Richard Guenther <rguenther@suse.de>
PR middle-end/25620
* builtins.c (expand_builtin_pow): Optimize non integer valued
constant exponents using sqrt or cbrt if possible. Always fall back
to expanding via optabs.
* gcc.target/i386/pow-1.c: New testcase.
* gcc.dg/builtins-58.c: Likewise.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2014-02-16 13:18 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-43419-4@http.gcc.gnu.org/bugzilla/>
2014-02-16 13:18 ` [Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0 jackie.rosen at hushmail dot com
2010-03-18 14:08 [Bug middle-end/43419] New: " vincent at vinc17 dot org
2010-03-18 14:33 ` [Bug middle-end/43419] " vincent at vinc17 dot org
2010-03-18 14:35 ` matz at gcc dot gnu dot org
2010-03-18 14:42 ` dominiq at lps dot ens dot fr
2010-03-18 14:49 ` matz at gcc dot gnu dot org
2010-03-18 15:31 ` rguenth at gcc dot gnu dot org
2010-03-18 16:08 ` matz at gcc dot gnu dot org
2010-03-18 16:48 ` matz at gcc dot gnu dot org
2010-03-22 14:58 ` jakub at gcc dot gnu dot org
2010-03-22 16:02 ` mikpe at it dot uu dot se
2010-03-25 16:18 ` hjl dot tools at gmail dot com
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