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[Bug tree-optimization/44423] [4.5/4.6 Regression] Massive performance regression in SSE code due to SRA
- From: "jamborm at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 8 Jun 2010 15:00:07 -0000
- Subject: [Bug tree-optimization/44423] [4.5/4.6 Regression] Massive performance regression in SSE code due to SRA
- References: <bug-44423-2736@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #9 from jamborm at gcc dot gnu dot org 2010-06-08 15:00 -------
(In reply to comment #8)
> I don't think you need flow-sensitivity.
>
> Basically when you have only aggregate uses (as in this case)
Vectors are considered scalars in GCC. That is why the solutions
described above work.
> then you only want to scalarize if the destination of the use is
> scalarized as well (to be able to copyprop out the aggregate copy).
Well, that is what I thought until someone filed PR 43846.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44423