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[PATCH, i386]: Improve ix86_fixup_binary_operands when both operands are in memory

From: Uros Bizjak <ubizjak at gmail dot com>
To: gcc-patches at gcc dot gnu dot org
Date: Thu, 17 Oct 2013 19:38:54 +0200
Subject: [PATCH, i386]: Improve ix86_fixup_binary_operands when both operands are in memory
Authentication-results: sourceware.org; auth=none

Hello!

Attached patch improves ix86_fixup_binary_operands a bit for the
unlikely situation when both input operands are placed in memory. The
patch forces non-matched operand 1 into register, leaving operand 2 in
memory. Since x86 instruction patterns allow memory operand via
operand 2, the new approach requires less fixups in reload pass.

2013-10-17  Uros Bizjak  <ubizjak@gmail.com>

    * config/i386/i386.c (ix86_fixup_binary_operands): When both source
    operands are in memory, prefer to force non-matched operand 1 to
    the register.

Patch was tested on x86_64-pc-linux-gnu {,-m32}  and committed to mainline SVN.

Uros.

Attachment: p.diff.txt
Description: Text document

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