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Re: [PATCH] PowerPC extendsfdf2 MEM alternative

From: Geoff Keating <geoffk at geoffk dot org>
To: David Edelsohn <dje at watson dot ibm dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Fri, 11 Mar 2005 12:39:12 -0800
Subject: Re: [PATCH] PowerPC extendsfdf2 MEM alternative
References: <200503111625.j2BGPTD30920@makai.watson.ibm.com>

On 11/03/2005, at 8:25 AM, David Edelsohn wrote:

PowerPC always stores floating point values in double precision format. That means loading a single precision value implicitly extends it for use in a double precision instruction. I think that the PowerPC extendsfdf2 pattern should advertise that it can extend from memory.

Geoff, does this seem reasonable to you? Any hidden gotchas?

No, that makes perfect sense.

Bootstrapped and regression tested on powerpc-ibm-aix5.2.0.0.

David

* config/rs6000/rs6000.md (extendsfdf2_fpr): Add MEM alternative.

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References:
- [PATCH] PowerPC extendsfdf2 MEM alternative
  - From: David Edelsohn

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