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(feholdexcept): Clear all exceptions in SW.

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This commit is contained in:
Ulrich Drepper 2007-04-16 20:13:01 +00:00
parent 30a3aa7530
commit 3431725412
1 changed files with 13 additions and 7 deletions
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20
sysdeps/i386/fpu/feholdexcpt.c
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@ -1,5 +1,6 @@
/* Store current floating-point environment and clear exceptions. /* Store current floating-point environment and clear exceptions.
Copyright (C) 1997, 1999, 2003, 2004, 2005 Free Software Foundation, Inc. Copyright (C) 1997, 1999, 2003, 2004, 2005, 2007
Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@ -26,14 +27,19 @@
int int
feholdexcept (fenv_t *envp) feholdexcept (fenv_t *envp)
{ {
unsigned short int work; fenv_t temp;
/* Store the environment. */ /* Store the environment. */
__asm__ ("fnstenv %0" : "=m" (*envp)); __asm__ ("fnstenv %0" : "=m" (temp));
*envp = temp;
/* Now set all exceptions to non-stop. */ /* Now set all exceptions to non-stop. */
work = envp->__control_word | 0x3f; temp.__control_word |= 0x3f;
__asm__ ("fldcw %0" : : "m" (*&work));
/* And clear all exceptions. */
temp.__status_word &= ~0x3f;
__asm__ ("fldenv %0" : : "m" (temp));
/* If the CPU supports SSE we set the MXCSR as well. */ /* If the CPU supports SSE we set the MXCSR as well. */
if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0) if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
@ -43,8 +49,8 @@ feholdexcept (fenv_t *envp)
/* Get the current control word. */ /* Get the current control word. */
__asm__ ("stmxcsr %0" : "=m" (*&xwork)); __asm__ ("stmxcsr %0" : "=m" (*&xwork));
/* Set all exceptions to non-stop. */ /* Set all exceptions to non-stop and clear them. */
xwork |= 0x1f80; xwork = (xwork | 0x1f80) & ~0x3f;
__asm__ ("ldmxcsr %0" : : "m" (*&xwork)); __asm__ ("ldmxcsr %0" : : "m" (*&xwork));
} }