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[PATCH, i386]: Robustify gcc.target/i386/readeflags-1.c

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: Fri, 10 Jul 2015 17:45:37 +0200
Subject: [PATCH, i386]: Robustify gcc.target/i386/readeflags-1.c
Authentication-results: sourceware.org; auth=none

Hello!

When using __readeflags, we have to prevent possible flag-clobbering
zero-extensions and make flag-setting operation persistent.

2015-07-10  Uros Bizjak  <ubizjak@gmail.com>

    PR target/66703
    * gcc.target/i386/readeflags-1.c (readeflags_test): Declare with
    __attribute__((noinline, noclone)).  Change "x" to "volatile char"
    type to prevent possible flag-clobbering zero-extensions.
    * gcc.target/i386/pr66703.c: New test.

Tested on x86_64-linux-gnu {,-m32}  and committed to mainline SVN.

Uros.

Attachment: t.diff.txt
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