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Re: [RFC PATCH]: Reciprocal sqrt (rsqrt) conversion pass

From: "Uros Bizjak" <ubizjak at gmail dot com>
To: "Richard Guenther" <rguenther at suse dot de>
Cc: "Paolo Bonzini" <bonzini at gnu dot org>, "GCC Patches" <gcc-patches at gcc dot gnu dot org>
Date: Wed, 13 Jun 2007 16:32:36 +0200
Subject: Re: [RFC PATCH]: Reciprocal sqrt (rsqrt) conversion pass
References: <5787cf470706130335k103552c8hcd58931a87b07328@mail.gmail.com> <466FE19D.3060200@gnu.org> <5787cf470706130551h54e85076tf6b598564a01c600@mail.gmail.com> <466FF08B.9000601@lu.unisi.ch> <Pine.LNX.4.64.0706131603570.27490@zhemvz.fhfr.qr> <5787cf470706130720s68ea0e82p5ca8b10990549a2d@mail.gmail.com>

On 6/13/07, Uros Bizjak <ubizjak@gmail.com> wrote:

I have checked some performance figures (gas_dyn.f90):
unpatched gcc: 21.317s
patched gcc: 4.352s (four seconds and some).

Oh, it is an early exit in action (didn't look at the end of results):

NEGATIVE ENERGY IN CELL 201 I=-3.07200E+04 FEL= 3.33901E-07 FER= 3.31971E-07

But anyway, the caclulation goes _much_ faster.

Uros.

Follow-Ups:
- Re: [RFC PATCH]: Reciprocal sqrt (rsqrt) conversion pass
  - From: Richard Guenther

References:
- [RFC PATCH]: Reciprocal sqrt (rsqrt) conversion pass
  - From: Uros Bizjak
- Re: [RFC PATCH]: Reciprocal sqrt (rsqrt) conversion pass
  - From: Paolo Bonzini
- Re: [RFC PATCH]: Reciprocal sqrt (rsqrt) conversion pass
  - From: Uros Bizjak
- Re: [RFC PATCH]: Reciprocal sqrt (rsqrt) conversion pass
  - From: Paolo Bonzini
- Re: [RFC PATCH]: Reciprocal sqrt (rsqrt) conversion pass
  - From: Richard Guenther
- Re: [RFC PATCH]: Reciprocal sqrt (rsqrt) conversion pass
  - From: Uros Bizjak

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