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| author | Ulrich Drepper <drepper@redhat.com> | 2007-05-07 06:22:38 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2007-05-07 06:22:38 +0000 |
| commit | 4a59e9adcb9e8475a00ea9088b26b74b48998dd0 (patch) | |
| tree | bd8ca665d3df88463cb4e328510db9625f9df75c /sysdeps/powerpc/fpu/feholdexcpt.c | |
| parent | 15eca72044d2148b4fe7fe5a0f89ea12a87640fe (diff) | |
| download | glibc-4a59e9adcb9e8475a00ea9088b26b74b48998dd0.tar.gz | |
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.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/sysdeps/powerpc/fpu/feholdexcpt.c b/sysdeps/powerpc/fpu/feholdexcpt.c index 150becd678..c9432248db 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; } |