4a59e9adcb
Peter Bergner <bergner@us.ibm.com> * sysdeps/powerpc/bits/fenv.h: Declare __fe_mask_env extern. Define FE_NOMASK_ENV as FE_EANBLED_ENV. Define FE_MASK_ENV. * sysdeps/powerpc/fpu/Makefile: Add fe_mask to libm-support. * sysdeps/powerpc/fpu/fe_mask.c: New file. * sysdeps/powerpc/fpu/fe_nomask.c: Correct comment. * sysdeps/powerpc/fpu/fedisblxcpt.c (fedisableexcept): Call __fe_mask_env() if all FP exceptions disabled. * sysdeps/powerpc/fpu/feholdexcpt.c (feholdexcept): Copy high 32-bits from old FPSCR to new fenv to propagate DFP rounding modes. Call __fe_mask_env() if FP exceptions previously enabled. * sysdeps/powerpc/fpu/fesetenv.c (fesetenv): Change mask to merge exceptions from env. Use __fe_nomask_env() or __fe_mask_env() when transitioning from all exceptions disabled to any exception enabled or visa versa. * sysdeps/powerpc/fpu/feupdateenv.c (__feupdateenv): Change mask to merge exceptions from env. Call __fe_nomask_env or __fe_mask_env when transitioning from all exceptions disabled to any exception enabled or visa versa. * sysdeps/unix/sysv/linux/powerpc/powerpc32/fe_nomask.c: Moved to... * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/fe_nomask.c: ...here. * sysdeps/unix/sysv/linux/powerpc/powerpc64/fe_nomask.c: Moved to... * sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu/fe_nomask.c: ...here. * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/fe_mask.c: New file. * sysdeps/unix/sysv/linux/powerpc/powerpc64/fpu/fe_mask.c: New file.
60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
/* Install given floating-point environment.
|
|
Copyright (C) 1997,99,2000,01,02,07 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <fenv_libc.h>
|
|
#include <bp-sym.h>
|
|
|
|
int
|
|
__fesetenv (const fenv_t *envp)
|
|
{
|
|
fenv_union_t old, new;
|
|
|
|
/* get the currently set exceptions. */
|
|
new.fenv = *envp;
|
|
old.fenv = fegetenv_register ();
|
|
|
|
/* If the old env has no eabled exceptions and the new env has any enabled
|
|
exceptions, then unmask SIGFPE in the MSR FE0/FE1 bits. This will put
|
|
the hardware into "precise mode" and may cause the FPU to run slower on
|
|
some hardware. */
|
|
if ((old.l[1] & 0x000000F8) == 0 && (new.l[1] & 0x000000F8) != 0)
|
|
(void)__fe_nomask_env ();
|
|
|
|
/* If the old env had any eabled exceptions and the new env has no enabled
|
|
exceptions, then mask SIGFPE in the MSR FE0/FE1 bits. This may allow the
|
|
FPU to run faster because it always takes the default action and can not
|
|
generate SIGFPE. */
|
|
if ((old.l[1] & 0x000000F8) != 0 && (new.l[1] & 0x000000F8) == 0)
|
|
(void)__fe_mask_env ();
|
|
|
|
fesetenv_register (*envp);
|
|
|
|
/* Success. */
|
|
return 0;
|
|
}
|
|
|
|
#include <shlib-compat.h>
|
|
#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
|
|
strong_alias (__fesetenv, __old_fesetenv)
|
|
compat_symbol (libm, BP_SYM (__old_fesetenv), BP_SYM (fesetenv), GLIBC_2_1);
|
|
#endif
|
|
|
|
libm_hidden_ver (__fesetenv, fesetenv)
|
|
versioned_symbol (libm, BP_SYM (__fesetenv), BP_SYM (fesetenv), GLIBC_2_2);
|