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Re: [Bug tree-optimization/14741] missing transformations lead topoorly optimized code

From: Daniel Berlin <dberlin at dberlin dot org>
To: jv244 at cam dot ac dot uk <gcc-bugzilla at gcc dot gnu dot org>
Cc: gcc-bugs at gcc dot gnu dot org
Date: Fri, 28 Jan 2005 12:22:02 -0500 (EST)
Subject: Re: [Bug tree-optimization/14741] missing transformations lead topoorly optimized code
References: <20040326121739.14741.jv244@cam.ac.uk> <20050128163133.21132.qmail@sourceware.org>

On Fri, 28 Jan 2005, jv244 at cam dot ac dot uk wrote:

------- Additional Comments From jv244 at cam dot ac dot uk 2005-01-28 16:31 -------

You could try "gfortran -O3 -mtune=pentium4  -ffast-math -mfpmath=sse
-ftree-loop-linear -ftree-vectorize yourcode.f90" and see if it helps.

Unhappily, seems to make things slower:

multgen/basic_mult>  gfortran -O3 -mtune=pentium4  -ffast-math -mfpmath=sse
-ftree-loop-linear -ftree-vectorize mult.f90
mult.f90:0: warning: SSE instruction set disabled, using 387 arithmetics

You'd need -msse2 or -msse (or is it -march=pentium4 that enables these?)

References:
- [Bug tree-optimization/14741] missing transformations lead to poorly optimized code
  - From: jv244 at cam dot ac dot uk

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