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Re: "Fix alias slowdown" patch miscompiles 464.h264ref in SPEC CPU
- From: "Daniel Berlin" <dberlin at dberlin dot org>
- To: "H. J. Lu" <hjl at lucon dot org>
- Cc: gcc at gcc dot gnu dot org
- Date: Sun, 10 Dec 2006 23:46:16 -0500
- Subject: Re: "Fix alias slowdown" patch miscompiles 464.h264ref in SPEC CPU
- References: <20061210201702.GA15453@lucon.org>
On 12/10/06, H. J. Lu <hjl@lucon.org> wrote:
2006
Reply-To:
Hi Daniel,
Do you have access to SPEC CPU 2006?
No, i don't, only SPEC CPU 2000.
Your patch
http://gcc.gnu.org/ml/gcc-patches/2006-12/msg00225.html
causes gcc 4.3 to miscompile 464.h264ref in SPEC CPU 2006 with
-O2 -ffast-math on Linux/x86-64. 464.h264ref compiled with gcc 4.3
generates incorrect output. We are working on a small testcase.
There was a typo fix to this patch in a later revision that was
necessary for correctness. I have no idea what rev "gcc 4.3" refers
to, so i can't tell you if what you are testing is new enough or not
:)
If you can get me a testcase, i can fix it.