--- Comment #17 from rakdver at gcc dot gnu dot org 2007-12-16 20:29
---
A possible way how to solve the problem:
http://gcc.gnu.org/ml/gcc-patches/2007-12/msg00769.html
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32283
--- Comment #16 from rakdver at kam dot mff dot cuni dot cz 2007-12-05
16:42 ---
Subject: Re: Missed induction variable optimization
> Please correct me if I am wrong, but I think that optimizing out the variable
> that holds number of iterations is not desirable on targets that have
--- Comment #15 from amonakov at gmail dot com 2007-12-05 16:26 ---
Zdenek,
please kindly share your thoughts on concerns expressed in previous comments.
The failures of number-of-iterations analysis prohibit applying modulo
scheduling to many simple loops that are otherwise eligible;
--- Comment #14 from ramana dot radhakrishnan at celunite dot com
2007-11-27 11:00 ---
(In reply to comment #13)
> This patch sometimes confuses loop2_doloop. On ia64 this prevents use of
> countable loop branch machine idiom (br.cloop). On the example used in this
> thread loop2_dolo
--- Comment #13 from amonakov at gmail dot com 2007-09-20 16:25 ---
This patch sometimes confuses loop2_doloop. On ia64 this prevents use of
countable loop branch machine idiom (br.cloop). On the example used in this
thread loop2_doloop complains:
Loop 1 is simple:
simple exit 5 ->
--- Comment #12 from dje at gcc dot gnu dot org 2007-09-10 18:29 ---
Created an attachment (id=14185)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14185&action=view)
postreload.c preprocessed
The patch broke bootstrap on powerpc-aix, powerpc-darwin, sparc-solaris, and
hpux -- pro
--- Comment #11 from rakdver at gcc dot gnu dot org 2007-09-08 13:19
---
Subject: Bug 32283
Author: rakdver
Date: Sat Sep 8 13:18:49 2007
New Revision: 128272
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=128272
Log:
PR tree-optimization/32283
* tree-ssa-loop-
--- Comment #10 from rakdver at gcc dot gnu dot org 2007-09-06 17:57
---
I'm testing a patch.
--
rakdver at gcc dot gnu dot org changed:
What|Removed |Added
Assi
--- Comment #9 from ramana dot radhakrishnan at celunite dot com
2007-09-05 11:46 ---
The above mentioned testcase works ok and generates auto-increments in Comment
#8 . I'd still be interested in looking at why the volatile case cannot work.
Adding Zdenek to the CC for this case.
--- Comment #8 from pranav dot bhandarkar at gmail dot com 2007-08-24
13:28 ---
Created an attachment (id=14102)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14102&action=view)
Another testcase displaying the said behaviour
IMHO, the code generated for the following can benefit
--- Comment #7 from pranav dot bhandarkar at gmail dot com 2007-06-14
20:50 ---
I guess strength reduction should then be implemented at the RTL level ?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32283
--- Comment #6 from pinskia at gcc dot gnu dot org 2007-06-13 17:53 ---
Look at PR 17108 also.
--
pinskia at gcc dot gnu dot org changed:
What|Removed |Added
BugsThisDep
--- Comment #5 from pranav dot bhandarkar at gmail dot com 2007-06-13
12:36 ---
Which RTL pass should take care of such induction variable optimization in 4.3
? For e.g In 4.1, It was old-loop that was doing it.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32283
--- Comment #4 from pinskia at gcc dot gnu dot org 2007-06-11 18:45 ---
Note this is most likely a dup of another bug which is talking about PPC.
--
pinskia at gcc dot gnu dot org changed:
What|Removed |Added
--
--- Comment #3 from pranav dot bhandarkar at gmail dot com 2007-06-11
14:33 ---
(In reply to comment #2)
> What if you remove the pointless 'volatile' from a?
>
No, removing the 'volatile' doesnt help either. The 'volatile' was because this
is part of a bigger test.
--
http://gcc
--- Comment #2 from rguenth at gcc dot gnu dot org 2007-06-11 14:06 ---
What if you remove the pointless 'volatile' from a?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32283
--- Comment #1 from pranav dot bhandarkar at gmail dot com 2007-06-11
13:45 ---
Created an attachment (id=13676)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13676&action=view)
Testcase displaying the said behaviour
Added testcase that exposes the problem
--
http://gcc.gnu.
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