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Re: Some benchmarks with Apple's -fast
- From: Bradley Lucier <lucier at math dot purdue dot edu>
- To: David Edelsohn <dje at watson dot ibm dot com>
- Cc: Bradley Lucier <lucier at math dot purdue dot edu>, gcc at gcc dot gnu dot org, nlucier at math dot purdue dot edu, feeley at iro dot umontreal dot ca
- Date: Thu, 25 Sep 2003 12:21:50 -0500
- Subject: Re: Some benchmarks with Apple's -fast
On Thursday, September 25, 2003, at 12:00 AM, David Edelsohn wrote:
Are you sure that you need -fno-strict-aliasing, as opposed to the
new Apple -frelax-aliasing option?
No. I looked at Apple's code in gcc/alias.c and don't understand it.
And I don't understand Mike Stump's explanation here:
On Tuesday, September 16, 2003, at 12:34 PM, Gabriel Dos Reis wrote:
what are the relations between the two, and -fno-strict-aliasing?
Incestuous. strict is at one end of a continuum, no-strict is at the
other. And in-between, where bad code and benchmark code lies, is
where relaxed fits in. It is the mind reader that knows what they
meant, and does the right think anyway, even though the code is wrong.
Also, have you tried profile-feedback?