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[PATCH, i386]: Fix PR78626, wrong code with -fschedule-insns

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, 9 Nov 2016 20:25:13 +0100
Subject: [PATCH, i386]: Fix PR78626, wrong code with -fschedule-insns
Authentication-results: sourceware.org; auth=none

Hello!

We need earlyclobber on output operand of doubleword shift insns,
since we have to prevent (partial) output matching %ecx as count
argument.

2016-11-09  Uros Bizjak  <ubizjak@gmail.com>

    PR target/78262
    * config/i386/i386.md (*<shift_insn><mode>3_doubleword): Mark
    operand 0 as earlyclobber.

testsuite/ChangeLog:

2016-11-09  Uros Bizjak  <ubizjak@gmail.com>

    PR target/78262
    * gcc.target/i386/pr78262.c: New test.

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

Committed to mainline, will be backported to release branches.

Uros.

Attachment: p.diff.txt
Description: Text document

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