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[Bug tree-optimization/21488] [4.0/4.1 regression] Not copy propagating single-argument PHIs causes out-of-ssa coalescing failure
- 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: 10 May 2005 23:27:17 -0000
- Subject: [Bug tree-optimization/21488] [4.0/4.1 regression] Not copy propagating single-argument PHIs causes out-of-ssa coalescing failure
- References: <20050510124823.21488.steven@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-05-10 23:27 -------
(In reply to comment #8)
> Be more specific:
>
> 1- What exactly is being "messed up".
Read Zdenek's comment about renaming them.
> 2- Why is it wrong?
Because now we have "unresolvable overlapping live ranges"
> 3- How would "fixing" this affect PR 18048?
I don't know if it does. The bug which Steven was referencing was really PR 19038, well there was some
discussion in PR 18048 about this problem also.
> 4- What do you think should be done differently?
Not creating "unresolvable overlapping live ranges", how I don't know.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21488