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authorBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2008-09-25 19:07:18 +0000
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2008-09-25 19:07:18 +0000
commitc7a58c2edadb8fce84ab2f8b129a87eb19bdc485 (patch)
treeb0ce15fb6eb16bbfe34612a21ffc16709d397b33 /libm/s_scalbln.c
parentc8d8b6d30a29b353637cd1c7379402bff2481b79 (diff)
- add some more math functions (patch from gentoo/solar)
Diffstat (limited to 'libm/s_scalbln.c')
-rw-r--r--libm/s_scalbln.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/libm/s_scalbln.c b/libm/s_scalbln.c
new file mode 100644
index 000000000..a780f3710
--- /dev/null
+++ b/libm/s_scalbln.c
@@ -0,0 +1,63 @@
+/* @(#)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"
+
+libm_hidden_proto(scalbln)
+#ifdef __STDC__
+static const double
+#else
+static double
+#endif
+two54 = 1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
+twom54 = 5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */
+huge = 1.0e+300,
+tiny = 1.0e-300;
+
+#ifdef __STDC__
+ double scalbln (double x, long int n)
+#else
+ double scalbln (x,n)
+ double x; long int n;
+#endif
+{
+ 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)