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[Bug target/27770] [4.2 Regression] wrong code in spec tests for -ftree-vectorize -maltivec
- From: "dje at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 7 Jun 2006 21:39:56 -0000
- Subject: [Bug target/27770] [4.2 Regression] wrong code in spec tests for -ftree-vectorize -maltivec
- References: <bug-27770-4503@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #16 from dje at gcc dot gnu dot org 2006-06-07 21:39 -------
I checked with the IBM XLC team and they speculatively increase the alignment
of variables that could be auto-vectorized, so that gives another vote for that
method. They did mention that whole-program IPA allows them to know when the
increased alignment actually will be needed before emitting any functions so
they can be more selective.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27770