summaryrefslogtreecommitdiff
path: root/libm/s_scalbln.c
diff options
context:
space:
mode:
authorDenis Vlasenko <vda.linux@googlemail.com>2009-01-03 13:51:12 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2009-01-03 13:51:12 +0000
commitb994ff9e32473ef3779cb23b4974295f3ba08aef (patch)
treeb25aec85165e003e4fc2a04480a2fba63d3e1c00 /libm/s_scalbln.c
parent15a971616c3e2f373264d0a2e4cd87aa11042737 (diff)
libm: remove scalbln implementation, it seems to be less correct than scalbn.
instead, either alias scalbln to scalbn if int == long on this arch, or just call scalbn form scalbln. text data bss dec hex filename - 45297 180 4 45481 b1a9 lib/libm.so + 44969 180 4 45153 b061 lib/libm.so
Diffstat (limited to 'libm/s_scalbln.c')
-rw-r--r--libm/s_scalbln.c52
1 files changed, 0 insertions, 52 deletions
diff --git a/libm/s_scalbln.c b/libm/s_scalbln.c
deleted file mode 100644
index 3d0ff2f77..000000000
--- a/libm/s_scalbln.c
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * ====================================================
- * 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 int 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 (k==0x7ff) return x+x; /* NaN or Inf */
- k = k+n;
- if (n> 50000 || 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)
- 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)