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Re: [PATCH 1/2] PowerPC: Change `z' constraint to mean XER[CA] instead of XER

From: David Edelsohn <dje dot gcc at gmail dot com>
To: Segher Boessenkool <segher at kernel dot crashing dot org>
Cc: gcc-patches at gcc dot gnu dot org
Date: Wed, 26 May 2010 21:44:23 -0400
Subject: Re: [PATCH 1/2] PowerPC: Change `z' constraint to mean XER[CA] instead of XER
References: <f568c595f8bf46dc8997bc281485f676c960865c.1274898160.git.segher@kernel.crashing.org>

       * config/rs6000/constraints.md ("z" constraint): Change to CA_REGS.
      * config/rs6000/predicates.md: Change XER_REGNO_P to CA_REGNO_P
      throughout.
      * config/rs6000/rs6000.c (rs6000_reg_names, alt_reg_names): Change
      "xer" to "ca".
      Change XER_REGNO_P to CA_REGNO_P, XER_REGNO to CA_REGNO, and
      XER_REGS to CA_REGS throughout.
      * config/rs6000/rs6000.h: Same.
      (ADDITIONAL_REGISTER_NAMES): Add "xer".
      * config/rs6000/rs6000.md: Change XER_REGNO to CA_REGNO.  Document
      that mode_iterator "P" is the size for arithmetic carries as well.
      * doc/md.texi (rs6000 section, "z" constraint): Fix documentation.

Okay.

The comment in REG_ALLOC_ORDER mentions that XER (now CA) is fixed.  I
assume that a later patch updates FIXED_REGISTERS,
CALL_USED_REGISTERS, CALL_REALLY_USED_REGISTERS, etc. and updates the
comment?

Thanks, David

Follow-Ups:
- Re: [PATCH 1/2] PowerPC: Change `z' constraint to mean XER[CA] instead of XER
  - From: Segher Boessenkool

References:
- [PATCH 1/2] PowerPC: Change `z' constraint to mean XER[CA] instead of XER
  - From: Segher Boessenkool

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