first commit of the new libm!

[musl] / src / math / s_scalbln.c

diff --git a/src/math/s_scalbln.c b/src/math/s_scalbln.c
deleted file mode 100644 (file)
index 12b9391..0000000
--- a/src/math/s_scalbln.c
+++ /dev/null
@@ -1,61 +0,0 @@
-/* @(#)s_scalbn.c 5.1 93/09/24 */
-/*
- * ====================================================
- * 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.
- * ====================================================
- */
-
-/*
- * scalbn (double x, int n)
- * scalbn(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"
-
-static const double
-two54   =  1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
-twom54  =  5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */
-huge   = 1.0e+300,
-tiny   = 1.0e-300;
-
-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*/
-        }
-        k += 54;                                /* subnormal result */
-        SET_HIGH_WORD(x,(hx&0x800fffff)|(k<<20));
-        return x*twom54;
-}
-
-double
-scalbn (double x, int n)
-{
-        return scalbln(x, n);
-}