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GNU C Library master sources branch, master, updated. glibc-2.14-590-gaed9d17
- From: drepper at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 22 Dec 2011 22:52:48 -0000
- Subject: GNU C Library master sources branch, master, updated. glibc-2.14-590-gaed9d17
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- Log -----------------------------------------------------------------
http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=aed9d17150a0d7060ef4245ce0b9612496ef84c7
commit aed9d17150a0d7060ef4245ce0b9612496ef84c7
Author: Ulrich Drepper <drepper@gmail.com>
Date: Thu Dec 22 17:52:30 2011 -0500
Add feraiseexcept optimization for x86-32
diff --git a/ChangeLog b/ChangeLog
index 7c79547..450d827 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
2011-12-22 Ulrich Drepper <drepper@gmail.com>
+ * sysdeps/i386/fpu/bits/fenv.h [__SSE_MATH__]: Add feraiseexcept
+ optimization.
+
[BZ #13185]
* sysdeps/i386/fpu/fgetexcptflg.c (__fegetexceptflag): Also return
SSE flags if possible.
diff --git a/sysdeps/i386/fpu/bits/fenv.h b/sysdeps/i386/fpu/bits/fenv.h
index ef3fcb3..e11e83f 100644
--- a/sysdeps/i386/fpu/bits/fenv.h
+++ b/sysdeps/i386/fpu/bits/fenv.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 1999, 2000, 2011 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
@@ -88,3 +88,41 @@ fenv_t;
/* Floating-point environment where none of the exception is masked. */
# define FE_NOMASK_ENV ((__const fenv_t *) -2)
#endif
+
+
+#if defined __SSE_MATH__ && defined __USE_EXTERN_INLINES
+__BEGIN_DECLS
+
+/* Optimized versions. */
+extern int __REDIRECT_NTH (__feraiseexcept_renamed, (int), feraiseexcept);
+__extern_inline int
+__NTH (feraiseexcept (int __excepts))
+{
+ if (__builtin_constant_p (__excepts)
+ && (__excepts & ~(FE_INVALID | FE_DIVBYZERO)) == 0)
+ {
+ if ((FE_INVALID & __excepts) != 0)
+ {
+ /* One example of a invalid operation is 0.0 / 0.0. */
+ float __f = 0.0;
+
+ __asm__ __volatile__ ("divss %0, %0 " : : "x" (__f));
+ (void) &__f;
+ }
+ if ((FE_DIVBYZERO & __excepts) != 0)
+ {
+ float __f = 1.0;
+ float __g = 0.0;
+
+ __asm__ __volatile__ ("divss %1, %0" : : "x" (__f), "x" (__g));
+ (void) &__f;
+ }
+
+ return 0;
+ }
+
+ return __feraiseexcept_renamed (__excepts);
+}
+
+__END_DECLS
+#endif
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 3 +++
sysdeps/i386/fpu/bits/fenv.h | 40 +++++++++++++++++++++++++++++++++++++++-
2 files changed, 42 insertions(+), 1 deletions(-)
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