s_scalbn.c: since we have strong_alias_untyped now, use it

[uclinux-h8/uClibc.git] / libm / s_scalbn.c

diff --git a/libm/s_scalbn.c b/libm/s_scalbn.c
index 9bb054a..4d2005c 100644 (file)
--- a/libm/s_scalbn.c
+++ b/libm/s_scalbn.c
@@ -1,4 +1,3 @@
-/* @(#)s_scalbn.c 5.1 93/09/24 */
 /*
  * ====================================================
  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
@@ -10,58 +9,64 @@
  * ====================================================
  */
 
-#if defined(LIBM_SCCS) && !defined(lint)
-static char rcsid[] = "$NetBSD: s_scalbn.c,v 1.8 1995/05/10 20:48:08 jtc Exp $";
-#endif
-
 /*
- * scalbn (double x, int n)
- * scalbn(x,n) returns x* 2**n  computed by  exponent
+ * scalbln(double x, long n)
+ * scalbln(x,n) returns x * 2**n computed by exponent
  * manipulation rather than by actually performing an
  * exponentiation or a multiplication.
  */
 
 #include "math.h"
 #include "math_private.h"
+#include <limits.h>
 
-#ifdef __STDC__
 static const double
-#else
-static double
-#endif
-two54   =  1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
-twom54  =  5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */
+two54  = 1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
+twom54 = 5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */
 huge   = 1.0e+300,
 tiny   = 1.0e-300;
 
-#ifdef __STDC__
-       double scalbn (double x, int n)
-#else
-       double scalbn (x,n)
-       double x; int n;
-#endif
+double scalbln(double x, long n)
 {
-       int32_t k,hx,lx;
-       EXTRACT_WORDS(hx,lx,x);
-        k = (hx&0x7ff00000)>>20;               /* extract exponent */
-        if (k==0) {                            /* 0 or subnormal x */
-            if ((lx|(hx&0x7fffffff))==0) return x; /* +-0 */
-           x *= two54;
-           GET_HIGH_WORD(hx,x);
-           k = ((hx&0x7ff00000)>>20) - 54;
-            if (n< -50000) return tiny*x;      /*underflow*/
-           }
-        if (k==0x7ff) return x+x;              /* NaN or Inf */
-        k = k+n;
-        if (k >  0x7fe) return huge*copysign(huge,x); /* overflow  */
-        if (k > 0)                             /* normal result */
-           {SET_HIGH_WORD(x,(hx&0x800fffff)|(k<<20)); return x;}
-        if (k <= -54) {
-            if (n > 50000)     /* in case integer overflow in n+k */
-               return huge*copysign(huge,x);   /*overflow*/
-           else return tiny*copysign(tiny,x);  /*underflow*/
+       int32_t k, hx, lx;
+
+       EXTRACT_WORDS(hx, lx, x);
+       k = (hx & 0x7ff00000) >> 20; /* extract exponent */
+       if (k == 0) { /* 0 or subnormal x */
+               if ((lx | (hx & 0x7fffffff)) == 0)
+                       return x; /* +-0 */
+               x *= two54;
+               GET_HIGH_WORD(hx, x);
+               k = ((hx & 0x7ff00000) >> 20) - 54;
        }
-        k += 54;                               /* subnormal result */
-       SET_HIGH_WORD(x,(hx&0x800fffff)|(k<<20));
-        return x*twom54;
+       if (k == 0x7ff)
+               return x + x; /* NaN or Inf */
+       k = k + n;
+       if (k > 0x7fe)
+               return huge * copysign(huge, x); /* overflow */
+       if (n < -50000)
+               return tiny * copysign(tiny, x); /* underflow */
+       if (k > 0) { /* normal result */
+               SET_HIGH_WORD(x, (hx & 0x800fffff) | (k << 20));
+               return x;
+       }
+       if (k <= -54) {
+               if (n > 50000) /* in case integer overflow in n+k */
+                       return huge * copysign(huge, x); /* overflow */
+               return tiny * copysign(tiny, x); /* underflow */
+       }
+       k += 54; /* subnormal result */
+       SET_HIGH_WORD(x, (hx & 0x800fffff) | (k << 20));
+       return x * twom54;
 }
+libm_hidden_def(scalbln)
+
+#if LONG_MAX == INT_MAX
+strong_alias_untyped(scalbln,scalbn)
+#else
+double scalbn(double x, int n)
+{
+       return scalbln(x, n);
+}
+#endif
+libm_hidden_def(scalbn)