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[PATCH, i386]: Allow non-REX memory operand for x86_64 zero-extracts involving high registers

From: Uros Bizjak <ubizjak at gmail dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Wed, 28 Dec 2016 16:37:48 +0100
Subject: [PATCH, i386]: Allow non-REX memory operand for x86_64 zero-extracts involving high registers
Authentication-results: sourceware.org; auth=none

Hello!

Attached patch allows non-REX memory operands for x86_64 zero-extracts
involving high registers. This needs to be implemented using peephole2
pattern, since we can't distinguish non-REX memory operand from normal
memory operands.

2016-12-28  Uros Bizjak  <ubizjak@gmail.com>

    PR target/78904
    * config/i386/constraints.md (Bn): New special memory constraint.
    * config/i386/predicates.md (norex_memory_operand): New predicate.
    * config/i386/i386.md (*extzvqi_mem_rex64): New insn pattern and
    corresponding peephole2 pattern.

testsuite/ChangeLog:

2016-12-28  Uros Bizjak  <ubizjak@gmail.com>

    PR target/78904
    * gcc.target/i386/pr78904-4.c: New test.
    * gcc.target/i386/pr78904-5.c: Ditto.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Committed to mainline SVN.

Uros.

Attachment: p.diff.txt
Description: Text document

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