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2007-03-22 Jakub Jelinek <jakub@redhat.com> [BZ #3427] * sysdeps/x86_64/fpu/feholdexcpt.c (feholdexcept): Clear all exceptions both in SW and MXCSR. * sysdeps/x86_64/fpu/feupdateenv.c: New file. * sysdeps/x86_64/fpu/feenablxcpt.c (feenableexcept): Remove dead code. * sysdeps/x86_64/fpu/fedisblxcpt.c (fedisableexcept): Likewise. * sysdeps/i386/fpu/feholdexcpt.c (feholdexcept): Clear all exceptions in MXCSR if SSE is available. * sysdeps/i386/fpu/feupdateenv.c: Include unistd.h, dl-procinfo.h and ldsodefs.h. (__feupdateenv): Query exceptions also from MXCSR if SSE is available. Fix comment typo. * sysdeps/ia64/fpu/feholdexcpt.c (feholdexcept): Clear all exceptions. Return 0 rather than 1. * sysdeps/ia64/fpu/feupdateenv.c (feupdateenv): Fix comment typo. Remove incorrect part of a comment. Fix argument to feraiseexcept. * math/test-fenv.c (feholdexcept_tests): New function. (main): Call it. 2007-01-05 Richard B. Kreckel <kreckel@ginac.de> [BZ #3427] * sysdeps/i386/fpu/feholdexcpt.c (feholdexcept): Clear all exceptions in SW.
48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/* Store current floating-point environment and clear exceptions.
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Copyright (C) 2001, 2005, 2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <fenv.h>
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int
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feholdexcept (fenv_t *envp)
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{
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unsigned int mxcsr;
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fenv_t temp;
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/* Store the environment. */
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__asm__ ("fnstenv %0\n"
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"stmxcsr %1" : "=m" (temp), "=m" (temp.__mxcsr));
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*envp = temp;
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/* Now set all exceptions to non-stop, first the x87 FPU. */
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temp.__control_word |= 0x3f;
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/* And clear all exceptions. */
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temp.__status_word &= ~0x3f;
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__asm__ ("fldenv %0" : : "m" (temp));
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/* Set the SSE MXCSR register. */
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mxcsr = (envp->__mxcsr | 0x1f80) & ~0x3f;
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__asm__ ("ldmxcsr %0" : : "m" (*&mxcsr));
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return 0;
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}
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libm_hidden_def (feholdexcept)
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