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Re: Question about an rtx expression.

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: Leehod Baruch <LEEHOD at il dot ibm dot com>, GCC Development <gcc at gcc dot gnu dot org>
Date: Tue, 23 Aug 2005 11:30:57 +0200
Subject: Re: Question about an rtx expression.
References: <OF8B82C77D.DAD633F4-ONC2257066.002BFED7-C2257066.00328E47@il.ibm.com>

Leehod Baruch wrote:

Hello,

Is it true that in a SET, a search for a _use_ of a register
in the LHS should be done only inside a memory address?

Also within the second and third arguments of a ZERO_EXTRACT. And its first argument may be a MEM, in which case you should look into it. Look at df_uses_record in df.c for more information.

But you can simply use the data flow info you compute, and just avoid uses that have the DF_REF_READ_WRITE flag set (because they occur in the LHS, or within an autoincrement/autodecrement)?

Paolo

References:
- Question about an rtx expression.
  - From: Leehod Baruch

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