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[Bug target/41156] [4.4/4.5 Regression] zlib segfault in inflate_table() compiled w/ -O -msse2 ftree-vectorize
- 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: 12 Oct 2009 13:59:50 -0000
- Subject: [Bug target/41156] [4.4/4.5 Regression] zlib segfault in inflate_table() compiled w/ -O -msse2 ftree-vectorize
- References: <bug-41156-682@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #24 from hjl dot tools at gmail dot com 2009-10-12 13:59 -------
(In reply to comment #23)
> > If you think adding -mstackrealign to your build is an acceptable solution,
> > we can close this bug. Otherwise, please test my latest gcc 4.4 patch for
> > PR 40838. Thanks.
>
> Your patch, by idea, more accurate - if now realign stack in ALL requred
> places. But also it unmotivated realign with AMDs too. I alredy ask: "Why
> -mstackrealign may be bad?". This is dark place. In manpage "-mstackrealign"
> described against SSE aligning problem. This is like wellknown solution, but
> unused wide. Why? What side-effects of "-mstackrealign"? Perfomance?
Please see PR 40838.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41156