--- Comment #14 from hjl at gcc dot gnu dot org 2009-10-30 16:05 ---
Subject: Bug 41497
Author: hjl
Date: Fri Oct 30 16:04:41 2009
New Revision: 153759
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=153759
Log:
2009-10-30 H.J. Lu
Backport from mainline:
2009-
--- Comment #13 from spop at gcc dot gnu dot org 2009-10-21 23:10 ---
Fixed.
This bug is potentially latent in older branches.
Should I test it in the 4.4 branch as well?
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spop at gcc dot gnu dot org changed:
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--- Comment #12 from spop at gcc dot gnu dot org 2009-10-21 23:05 ---
Subject: Bug 41497
Author: spop
Date: Wed Oct 21 23:05:39 2009
New Revision: 153441
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=153441
Log:
PR tree-optimization/41497
* tree-scalar-evolution
--- Comment #10 from spop at gcc dot gnu dot org 2009-10-20 21:53 ---
Subject: Re: [4.5 Regression] apparent integer
wrong code bug
> The problem is that we follow SSA edges into loops that may not be executed.
It is correct to follow SSA edges in loops that may not execute,
--- Comment #9 from rguenth at gcc dot gnu dot org 2009-10-12 20:24 ---
The problem is that we follow SSA edges into loops that may not be executed.
Sebastian - how are we supposed to deal with this case?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41497
--- Comment #8 from rguenth at gcc dot gnu dot org 2009-10-12 20:23 ---
Eh, indeed if that fixes it the bug is elsewhere. I suggest to not apply this
partial reversion until we know better.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41497
--- Comment #7 from ebotcazou at gcc dot gnu dot org 2009-10-12 17:59
---
> It is caused by revision 147716:
>
> http://gcc.gnu.org/ml/gcc-cvs/2009-05/msg00693.html
Yep, but it's Richard's fault. ;-) The bug is exposed by the change requested
in http://gcc.gnu.org/ml/gcc-patches/2009
--- Comment #6 from hjl dot tools at gmail dot com 2009-10-11 19:34 ---
It is caused by revision 147716:
http://gcc.gnu.org/ml/gcc-cvs/2009-05/msg00693.html
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hjl dot tools at gmail dot com changed:
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--- Comment #5 from hjl dot tools at gmail dot com 2009-10-11 16:59 ---
Revision 147714 is OK and revision 147717 is bad.
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hjl dot tools at gmail dot com changed:
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--- Comment #4 from rguenth at gcc dot gnu dot org 2009-10-11 11:56 ---
Sebastian, can you have a look?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41497
--- Comment #3 from rguenth at gcc dot gnu dot org 2009-10-11 11:56 ---
The key is IMHO that the inner loop does not have its loop header copied.
This confuses SCEV enough to think that a = (unsigned short)a is always
executed. LIM is necessary to promote all the memory to SSA names, th
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rguenth at gcc dot gnu dot org changed:
What|Removed |Added
Priority|P3 |P1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41497
--- Comment #2 from rguenth at gcc dot gnu dot org 2009-09-29 09:51 ---
Thus, confirmed.
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rguenth at gcc dot gnu dot org changed:
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