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[Patch, microblaze]: Add support for swap instructions and reorder option

From: David Holsgrove <david dot holsgrove at xilinx dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Cc: "Michael Eager (eager at eagercon dot com)" <eager at eagercon dot com>, John Williams <jwilliams at xilinx dot com>, "Edgar E. Iglesias (edgar dot iglesias at gmail dot com)" <edgar dot iglesias at gmail dot com>, Vinod Kathail <vinodk at xilinx dot com>, Vidhumouli Hunsigida <vidhum at xilinx dot com>, Nagaraju Mekala <nmekala at xilinx dot com>, Tom Shui <tshui at xilinx dot com>
Date: Mon, 11 Feb 2013 06:39:26 +0000
Subject: [Patch, microblaze]: Add support for swap instructions and reorder option

Add support for swap instructions and reorder option

swapb and swaph instructions are introduced in microblaze cpu (mcpu) v8.30a,
but have an undocumented dependence on -mxl-pattern-compare being set.

The conditions for their use are;

mcpu < 8.30a; no swap insns, use of -mxl-reorder produces warning
and ignored

mcpu == 8.30a and -mxl-pattern-compare specified;
and if -mno-xl-reorder not specified, then swap insns allowed

mcpu > 8.30a;
if -mno-xl-reorder not specified, then swap insns allowed

Changelog

2013-02-11  David Holsgrove <david.holsgrove@xilinx.com>

  * config/microblaze/microblaze.c: microblaze_has_swap = 0
     Add version check for v8.30.a to enable microblaze_has_swap
  * config/microblaze/microblaze.h: Add TARGET_HAS_SWAP
  * config/microblaze/microblaze.md: New bswapsi2 and bswaphi2
     instructions
  * config/microblaze/microblaze.opt: New options -mxl-reorder
     and -mno-xl-reorder

Attachment: 0007-Gcc-Added-swapb-and-swaph-instructions-and-mxl-reord.patch
Description: 0007-Gcc-Added-swapb-and-swaph-instructions-and-mxl-reord.patch

Follow-Ups:
- Re: [Patch, microblaze]: Add support for swap instructions and reorder option
  - From: Michael Eager

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