From 9be36fb8cb5bcdab5bbbc7a36388dc9a3d1cc397 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Wed, 26 Mar 2014 18:59:08 +0000 Subject: 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. --- math/test-fenv-preserve.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 math/test-fenv-preserve.c (limited to 'math/test-fenv-preserve.c') diff --git a/math/test-fenv-preserve.c b/math/test-fenv-preserve.c new file mode 100644 index 0000000..8288b2c --- /dev/null +++ b/math/test-fenv-preserve.c @@ -0,0 +1,53 @@ +/* Test fegetenv preserves exception mask (bug 16198). + Copyright (C) 2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include + +static int +do_test (void) +{ + fenv_t env; + + if (feenableexcept (FE_INVALID) != 0) + { + puts ("feenableexcept (FE_INVALID) failed, cannot test"); + return 0; + } + + if (fegetenv (&env) != 0) + { + puts ("fegetenv failed, cannot test"); + return 0; + } + + int ret = fegetexcept (); + if (ret == FE_INVALID) + { + puts ("fegetenv preserved exception mask, OK"); + return 0; + } + else + { + printf ("fegetexcept returned %d, expected %d\n", ret, FE_INVALID); + return 1; + } +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" -- cgit v1.1