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[Bug target/39137] [4.4 Regression] -mpreferred-stack-boundary=2 causes lots of dynamic realign
- From: "hjl dot tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 9 Feb 2009 15:21:29 -0000
- Subject: [Bug target/39137] [4.4 Regression] -mpreferred-stack-boundary=2 causes lots of dynamic realign
- References: <bug-39137-87@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from hjl dot tools at gmail dot com 2009-02-09 15:21 -------
(In reply to comment #3)
> How can #1 cause a problem with -ftree-vectorize (especially when it hasn't
I don't believe "-mpreferred-stack-boundary=2 -ftree-vectorize" works
well in gcc 4.3.
> been problem in 4.3 and earlier)? We'd do realignment for V[1248]* modes, just
> not for DImode/DFmode...
>
Xuepeng, Joey, can you verify align DImode/DFmode to 4 bytes on stack,
when "-Os -mpreferred-stack-boundary=2" is used, won't cause prolems with
-ftree-vectorize?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39137