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* [Bug c/58515] New: Loop optimized away when it should not
@ 2013-09-23 21:21 manus at eiffel dot com
2013-09-23 21:24 ` [Bug c/58515] " manus at eiffel dot com
0 siblings, 1 reply; 2+ messages in thread
From: manus at eiffel dot com @ 2013-09-23 21:21 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58515
Bug ID: 58515
Summary: Loop optimized away when it should not
Product: gcc
Version: 4.7.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: manus at eiffel dot com
Created attachment 30885
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30885&action=edit
To reproduce code generation issue
If you compile the attached code with -O3 the `slow' function becomes a no-op
which is incorrect. Older version of GCC I've tried generated proper code. I
could not try newer version.
To reproduce compile with -O3 the attached file.
I found this while fixing the warning that GCC raises when compiling the `fast'
function.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c/58515] Loop optimized away when it should not
2013-09-23 21:21 [Bug c/58515] New: Loop optimized away when it should not manus at eiffel dot com
@ 2013-09-23 21:24 ` manus at eiffel dot com
0 siblings, 0 replies; 2+ messages in thread
From: manus at eiffel dot com @ 2013-09-23 21:24 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58515
Emmanuel Stapf <manus at eiffel dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Emmanuel Stapf <manus at eiffel dot com> ---
Sorry the test code was not the proper one I intended to use since it seems
legitimate that gcc optimizes this away due to the absence of side effects.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-09-23 21:21 [Bug c/58515] New: Loop optimized away when it should not manus at eiffel dot com
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