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[platform/upstream/glibc.git] / math / w_scalbf.c

diff --git a/math/w_scalbf.c b/math/w_scalbf.c
index 60cb567..7ab0b8a 100644 (file)
--- a/math/w_scalbf.c
+++ b/math/w_scalbf.c
@@ -1,66 +1,76 @@
-/* w_scalbf.c -- float version of w_scalb.c.
- * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
- */
+/* Copyright (C) 2011-2014 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_scalbf.c,v 1.3 1995/05/10 20:49:50 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.
 
-/*
- * wrapper scalbf(float x, float fn) is provide for
- * passing various standard test suite. One
- * should use scalbn() instead.
- */
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
 
+#include <errno.h>
 #include <math.h>
-#include "math_private.h"
+#include <math_private.h>
 
-#include <errno.h>
 
-#ifdef __STDC__
-#ifdef _SCALB_INT
-       float __scalbf(float x, int fn)         /* wrapper scalbf */
-#else
-       float __scalbf(float x, float fn)               /* wrapper scalbf */
-#endif
-#else
-       float __scalbf(x,fn)                    /* wrapper scalbf */
-#ifdef _SCALB_INT
-       float x; int fn;
-#else
-       float x,fn;
-#endif
-#endif
+static float
+__attribute__ ((noinline))
+sysv_scalbf (float x, float fn)
 {
-#ifdef _IEEE_LIBM
-       return __ieee754_scalbf(x,fn);
-#else
-       float z;
-       z = __ieee754_scalbf(x,fn);
-       if(_LIB_VERSION != _SVID_) return z;
-       if(!(__finitef(z)||__isnanf(z))&&__finitef(x)) {
-           /* scalbf overflow */
-           return (float)__kernel_standard((double)x,(double)fn,132);
-       }
-       if(z==(float)0.0&&z!=x) {
-           /* scalbf underflow */
-           return (float)__kernel_standard((double)x,(double)fn,133);
+  float z = __ieee754_scalbf (x, fn);
+
+  if (__glibc_unlikely (__isinff (z)))
+    {
+      if (__finitef (x))
+       return __kernel_standard_f (x, fn, 132); /* scalb overflow */
+      else
+       __set_errno (ERANGE);
+    }
+  else if (__builtin_expect (z == 0.0f, 0) && z != x)
+    return __kernel_standard_f (x, fn, 133); /* scalb underflow */
+
+  return z;
+}
+
+
+/* Wrapper scalbf */
+float
+__scalbf (float x, float fn)
+{
+  if (__glibc_unlikely (_LIB_VERSION == _SVID_))
+    return sysv_scalbf (x, fn);
+  else
+    {
+      float z = __ieee754_scalbf (x, fn);
+
+      if (__glibc_unlikely (!__finitef (z) || z == 0.0f))
+       {
+         if (__isnanf (z))
+           {
+             if (!__isnanf (x) && !__isnanf (fn))
+               __set_errno (EDOM);
+           }
+         else if (__isinf_nsf (z))
+           {
+             if (!__isinf_nsf (x) && !__isinf_nsf (fn))
+               __set_errno (ERANGE);
+           }
+         else
+           {
+             /* z == 0.  */
+             if (x != 0.0f && !__isinf_nsf (fn))
+               __set_errno (ERANGE);
+           }
        }
-#ifndef _SCALB_INT
-       if(!__finitef(fn)) __set_errno (ERANGE);
-#endif
-       return z;
-#endif
+      return z;
+    }
 }
 weak_alias (__scalbf, scalbf)