diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2007-05-10 06:44:30 +0000 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2007-05-10 06:44:30 +0000 |
| commit | 96bad006f14ac46ca7a59dc4c5ba5ed9ef7a1560 (patch) | |
| tree | 9e209798f73466fb9622bf0a9b14f4fabf00eb29 /sysdeps/powerpc/fpu/fesetenv.c | |
| parent | 2a0a747e57ec96bab9d4a6b7c0b32df82a41316e (diff) | |
Updated to fedora-glibc-20070510T0634cvs/fedora-glibc-2_5_90-23
Diffstat (limited to 'sysdeps/powerpc/fpu/fesetenv.c')
| -rw-r--r-- | sysdeps/powerpc/fpu/fesetenv.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/sysdeps/powerpc/fpu/fesetenv.c b/sysdeps/powerpc/fpu/fesetenv.c index ff82dfd176..5a0c742ffe 100644 --- a/sysdeps/powerpc/fpu/fesetenv.c +++ b/sysdeps/powerpc/fpu/fesetenv.c @@ -1,5 +1,5 @@ /* Install given floating-point environment. - Copyright (C) 1997,99,2000,01,02 Free Software Foundation, Inc. + 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 @@ -23,6 +23,26 @@ 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. */ |