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[PATCH, i386]: Fix PR71245, atomic load/store bounces the data to the stack using fild/fistp

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: Sun, 29 May 2016 22:55:11 +0200
Subject: [PATCH, i386]: Fix PR71245, atomic load/store bounces the data to the stack using fild/fistp
Authentication-results: sourceware.org; auth=none

Hello!

As shown in the PR, when moving DFmode value to/from a FP register, we
don't need to bounce it with an atomic DImode fild/fistp in case of
-march=pentium. DFmode move is atomic by itself.

2016-05-29  Uros Bizjak  <ubizjak@gmail.com>

    PR target/71245
    * config/i386/sync.md (define_peephole2 atomic_storedi_fpu):
    New peepholes to remove unneeded fild/fistp pairs.
    (define_peephole2 atomic_loaddi_fpu): Ditto.

testsuite/ChangeLog:

2016-05-29  Uros Bizjak  <ubizjak@gmail.com>

    PR target/71245
    * gcc.target/i386/pr71245-1.c: New test.
    * gcc.target/i386/pr71245-2.c: Ditto.

Bootstrapped on x86_64-linux-gnu and regression tested with -m32/march=pentium.

Committed to mainline SVN.

Uros.

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