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Re: Code optimization with GCSE

From: Paolo Bonzini <bonzini at gnu dot org>
To: Jean Christophe Beyler <jean dot christophe dot beyler at gmail dot com>
Cc: gcc at gcc dot gnu dot org
Date: Wed, 15 Jul 2009 07:29:03 +0200
Subject: Re: Code optimization with GCSE
References: <c568a2600907141301r7ad9c8d0i8a3cf7ff0b00d1d6@mail.gmail.com>

As you can see, the compiler uses r9 to store data and then uses that
for data[0] but also loads in r7 data+8 instead of directly using r9.
If I remove the loop then it does not do this.

This optimization is done by CSE only, currently. That's why it cannot look through loops.

Paolo

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References:
- Code optimization with GCSE
  - From: Jean Christophe Beyler

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