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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/bits/fenv.h
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/bits/fenv.h')
-rw-r--r--sysdeps/powerpc/bits/fenv.h18
1 files changed, 14 insertions, 4 deletions
diff --git a/sysdeps/powerpc/bits/fenv.h b/sysdeps/powerpc/bits/fenv.h
index 8509b4b0c3..10582a6ff6 100644
--- a/sysdeps/powerpc/bits/fenv.h
+++ b/sysdeps/powerpc/bits/fenv.h
@@ -137,9 +137,19 @@ extern const fenv_t __fe_nonieee_env;
 # define FE_NONIEEE_ENV	(&__fe_nonieee_env)
 
 /* Floating-point environment with all exceptions enabled.  Note that
-   just evaluating this value will set the processor into 'FPU
-   exceptions imprecise recoverable' mode, which may cause a significant
-   performance penalty (but have no other visible effect).  */
+   just evaluating this value does not change the processor exception mode.
+   Passing this mask to fesetenv will result in a prctl syscall to change
+   the MSR FE0/FE1 bits to "Precise Mode".  On some processors this will
+   result in slower floating point execution.  This will last until an
+   fenv or exception mask is installed that disables all FP exceptions.  */
 extern const fenv_t *__fe_nomask_env (void);
-# define FE_NOMASK_ENV	(__fe_nomask_env ())
+# define FE_NOMASK_ENV	FE_ENABLED_ENV
+
+/* Floating-point environment with all exceptions disabled.  Note that
+   just evaluating this value does not change the processor exception mode.
+   Passing this mask to fesetenv will result in a prctl syscall to change
+   the MSR FE0/FE1 bits to "Ignore Exceptions Mode".  On most processors
+   this allows the fastest possible floating point execution.*/
+extern const fenv_t *__fe_mask_env (void);
+# define FE_MASK_ENV	FE_DFL_ENV
 #endif