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Re: g++ doesn't unroll a loop it should unroll

From: "Steven Bosscher" <stevenb dot gcc at gmail dot com>
To: "Benoît Jacob" <jacob at math dot jussieu dot fr>
Cc: gcc at gcc dot gnu dot org
Date: Wed, 13 Dec 2006 13:12:03 +0100
Subject: Re: g++ doesn't unroll a loop it should unroll
References: <200612131244.58528.jacob@math.jussieu.fr>

On 12/13/06, Benoît Jacob <jacob@math.jussieu.fr> wrote:

g++ -DUNROLL -O3 toto.cpp -o toto   ---> toto runs in 0.3 seconds
g++ -O3 toto.cpp -o toto            ---> toto runs in 1.9 seconds
So what can I do? Is that a bug in g++? If yes, any hope to see it fixed soon?

You could try adding -funroll-loops.

Gr.
Steven

Follow-Ups:
- Re: g++ doesn't unroll a loop it should unroll
  - From: Benoît Jacob

References:
- g++ doesn't unroll a loop it should unroll
  - From: Benoît Jacob

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