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[Bug tree-optimization/33404] Predictive commoning + ivopts possibly introducing extra sign extensions.
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 23 Jul 2008 02:01:13 -0000
- Subject: [Bug tree-optimization/33404] Predictive commoning + ivopts possibly introducing extra sign extensions.
- References: <bug-33404-14766@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from pinskia at gcc dot gnu dot org 2008-07-23 02:01 -------
>for the loop on the trunk.
I think the trunk improved fold somewhere along the way, because the 4.3 I have
from January has the extra sign extension.
>We will get a zero extension in the assembly (on Powerpc-linux-gnu).
Also IV-opts is messing up anyways, it should have done out+1 as the base
instead of out, blah.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
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Keywords| |missed-optimization
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33404