[Bug math/16198] [x86_64] fegetenv() clears exception mask on x86_64

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https://sourceware.org/bugzilla/show_bug.cgi?id=16198

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9be36fb8cb5bcdab5bbbc7a36388dc9a3d1cc397

commit 9be36fb8cb5bcdab5bbbc7a36388dc9a3d1cc397
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Mar 26 18:59:08 2014 +0000

    Make x86_64 fegetenv preserve exception mask (bug 16198).

    Bug 16198 is x86_64 fegetenv wrongly masking exceptions for which
    traps are enabled, because that's a side-effect of the fnstenv
    instruction.  This patch fixes it to use fldenv immediately after
    fnstenv, like the i386 version.  Tested x86_64 and x86.

        [BZ #16198]
        * sysdeps/x86_64/fpu/fegetenv.c (fegetenv): Use fldenv after
        fnstenv.
        * math/test-fenv-preserve.c: New file.
        * math/Makefile (tests): Add test-fenv-preserve.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                     |    8 +++++
 NEWS                                          |    8 +++---
 math/Makefile                                 |    2 +-
 nptl/tst-spin1.c => math/test-fenv-preserve.c |   35 +++++++++++-------------
 sysdeps/x86_64/fpu/fegetenv.c                 |    3 ++
 5 files changed, 32 insertions(+), 24 deletions(-)
 copy nptl/tst-spin1.c => math/test-fenv-preserve.c (62%)

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