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[Patch, microblaze]: Branch Compare unroll loops

From: David Holsgrove <david dot holsgrove at xilinx dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Michael Eager <eager at eagerm dot com>, Edgar Iglesias <edgari at xilinx dot com>, John Williams <jwilliams at xilinx 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, 15 Jul 2013 14:58:32 +1000
Subject: [Patch, microblaze]: Branch Compare unroll loops

To facilitate optimization pass understanding of the conditional
branch for microblaze, remove the UNSPEC'd signed_compare /
unsigned_compare instructions, and replace with a complete
branch_compare which will output_asm_insn the correct cmp/cmpu
depending on comparison code and signed / unsigned.

We then return the correct branch instruction.

cbranchsi now calls an expanded microblaze_expand_conditional_branch
function which will carry out compare against zero, compare EQ/NE,
and all other compares appropriately.

-funroll-loops optimization pass can now proceed

Changelog

2013-07-15  David Holsgrove <david.holsgrove@xilinx.com>

 * gcc/config/microblaze/predicates.md: Add cmp_op predicate.
 * gcc/config/microblaze/microblaze.md: Add branch_compare
   instruction which uses cmp_op predicate and emits cmp insn
   before branch.
 * gcc/config/microblaze/microblaze.c
   (microblaze_emit_compare): Rename to
   microblaze_expand_conditional_branch and consolidate logic.
   (microblaze_expand_conditional_branch): emit branch_compare
   insn instead of handling cmp op separate from branch insn.

thanks,
David

Attachment: 0009-Patch-microblaze-Add-branch_compare-instruction.patch
Description: Binary data

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