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Re: GCC is 7 times slower than Intel? How to optimize? Need help!!

From: Ian Lance Taylor <iant at google dot com>
To: jackfrost <jackfrost at list dot ru>
Cc: gcc-help at gcc dot gnu dot org
Date: Tue, 07 Oct 2008 07:15:07 -0700
Subject: Re: GCC is 7 times slower than Intel? How to optimize? Need help!!
References: <19817010.post@talk.nabble.com> <m3bpxx58yn.fsf@google.com> <19851776.post@talk.nabble.com>

jackfrost <jackfrost@list.ru> writes:

> I've tried  -ffast-math.
> with the same result.

-ffast-math will certainly make the program you posted run faster on
x86, so I'm not sure in what sense the result is the same.  Note that
-ffast-math must be used in conjunction with -O2 or similar.

Ian

References:
- GCC is 7 times slower than Intel? How to optimize? Need help!!
  - From: jackfrost
- Re: GCC is 7 times slower than Intel? How to optimize? Need help!!
  - From: Ian Lance Taylor
- Re: GCC is 7 times slower than Intel? How to optimize? Need help!!
  - From: jackfrost

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