aboutsummaryrefslogtreecommitdiff
path: root/math/w_jnf.c
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@gmail.com>2011-10-12 11:27:51 -0400
committerUlrich Drepper <drepper@gmail.com>2011-10-12 11:27:51 -0400
commit0ac5ae2335292908f39031b1ea9fe8edce433c0f (patch)
treef9d26c8abc0de39d18d4c13e70f6022cdc6b461f /math/w_jnf.c
parenta843a204a3e8a0dd53584dad3668771abaec84ac (diff)
downloadglibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.zip
glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.gz
glibc-0ac5ae2335292908f39031b1ea9fe8edce433c0f.tar.bz2
Optimize libm
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
Diffstat (limited to 'math/w_jnf.c')
-rw-r--r--math/w_jnf.c109
1 files changed, 49 insertions, 60 deletions
diff --git a/math/w_jnf.c b/math/w_jnf.c
index 0b9a2aa..7b35955 100644
--- a/math/w_jnf.c
+++ b/math/w_jnf.c
@@ -1,71 +1,60 @@
-/* w_jnf.c -- float version of w_jn.c.
- * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
- */
+/* Copyright (C) 2011 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
-/*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
-#if defined(LIBM_SCCS) && !defined(lint)
-static char rcsid[] = "$NetBSD: w_jnf.c,v 1.3 1995/05/10 20:49:21 jtc Exp $";
-#endif
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <fenv.h>
#include <math.h>
#include <math_private.h>
-#ifdef __STDC__
- float jnf(int n, float x) /* wrapper jnf */
-#else
- float jnf(n,x) /* wrapper jnf */
- float x; int n;
-#endif
+
+/* wrapper jnf */
+float
+jnf (int n, float x)
{
-#ifdef _IEEE_LIBM
- return __ieee754_jnf(n,x);
-#else
- float z;
- z = __ieee754_jnf(n,x);
- if(_LIB_VERSION == _IEEE_ || __isnanf(x) ) return z;
- if(fabsf(x)>(float)X_TLOSS) {
- /* jn(|x|>X_TLOSS,n) */
- return (float)__kernel_standard((double)n,(double)x,138);
- } else
- return z;
-#endif
+ if (__builtin_expect (fabsf (x) > (float) X_TLOSS, 0)
+ && _LIB_VERSION != _IEEE_)
+ /* jn(n,|x|>X_TLOSS) */
+ return __kernel_standard_f (n, x, 138);
+
+ return __ieee754_jnf (n, x);
}
-#ifdef __STDC__
- float ynf(int n, float x) /* wrapper ynf */
-#else
- float ynf(n,x) /* wrapper ynf */
- float x; int n;
-#endif
+
+/* wrapper ynf */
+float
+ynf (int n, float x)
{
-#ifdef _IEEE_LIBM
- return __ieee754_ynf(n,x);
-#else
- float z;
- z = __ieee754_ynf(n,x);
- if(_LIB_VERSION == _IEEE_ || __isnanf(x) ) return z;
- if(x <= (float)0.0){
- if(x==(float)0.0)
- /* d= -one/(x-x); */
- return (float)__kernel_standard((double)n,(double)x,112);
- else
- /* d = zero/(x-x); */
- return (float)__kernel_standard((double)n,(double)x,113);
- }
- if(x>(float)X_TLOSS) {
- /* yn(x>X_TLOSS,n) */
- return (float)__kernel_standard((double)n,(double)x,139);
- } else
- return z;
-#endif
+ if (__builtin_expect (x <= 0.0f || x > (float) X_TLOSS, 0)
+ && _LIB_VERSION != _IEEE_)
+ {
+ if (x < 0.0f)
+ {
+ /* d = zero/(x-x) */
+ feraiseexcept (FE_INVALID);
+ return __kernel_standard_f (n, x, 113);
+ }
+ else if (x == 0.0)
+ /* d = -one/(x-x) */
+ return __kernel_standard_f (n, x, 112);
+ else
+ /* yn(n,x>X_TLOSS) */
+ return __kernel_standard_f (n, x, 139);
+ }
+
+ return __ieee754_ynf (n, x);
}