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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: 9 Jun 2010 09:05:57 -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 #12 from jamborm at gcc dot gnu dot org 2010-06-09 09:05 -------
(In reply to comment #11)
> > D.2464.m[0] = D.2473_20;
> > D.2464.m[1] = D.2472_19;
> > D.2464.m[2] = D.2471_18;
> > *b_1(D) = D.2464;
> >
> > D.2464 will be dead after scalarization.
>
> If D.2464 was larger than just m, that would not necessarily be the
> case and we would still want to avoid the extra copies.
>
Of course this would be true only if the last assignment was
*b_1(D) = D.2464.m;
but the argument is the same.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44423