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authorUlrich Drepper <drepper@redhat.com>2007-05-07 06:22:38 +0000
committerUlrich Drepper <drepper@redhat.com>2007-05-07 06:22:38 +0000
commit4a59e9adcb9e8475a00ea9088b26b74b48998dd0 (patch)
treebd8ca665d3df88463cb4e328510db9625f9df75c /sysdeps/powerpc/fpu/feholdexcpt.c
parent15eca72044d2148b4fe7fe5a0f89ea12a87640fe (diff)
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2007-04-30 Steven Munroe <sjmunroe@us.ibm.com>
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.
Diffstat (limited to 'sysdeps/powerpc/fpu/feholdexcpt.c')
-rw-r--r--sysdeps/powerpc/fpu/feholdexcpt.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/sysdeps/powerpc/fpu/feholdexcpt.c b/sysdeps/powerpc/fpu/feholdexcpt.c
index 150becd..c943224 100644
--- a/sysdeps/powerpc/fpu/feholdexcpt.c
+++ b/sysdeps/powerpc/fpu/feholdexcpt.c
@@ -22,17 +22,24 @@
int
feholdexcept (fenv_t *envp)
{
- fenv_union_t u;
+ fenv_union_t old, new;
- /* Get the current state. */
- u.fenv = *envp = fegetenv_register ();
+ /* Save the currently set exceptions. */
+ old.fenv = *envp = fegetenv_register ();
- /* Clear everything except for the rounding mode and non-IEEE arithmetic
+ /* Clear everything except for the rounding modes and non-IEEE arithmetic
flag. */
- u.l[1] = u.l[1] & 7;
+ new.l[1] = old.l[1] & 7;
+ new.l[0] = old.l[0];
+
+ /* If the old env had any eabled 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)
+ (void)__fe_mask_env ();
/* Put the new state in effect. */
- fesetenv_register (u.fenv);
+ fesetenv_register (new.fenv);
return 0;
}