diff options
author | Bdale Garbee <bdale@gag.com> | 2018-10-20 01:18:12 -0600 |
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committer | Bdale Garbee <bdale@gag.com> | 2018-10-20 01:18:12 -0600 |
commit | 0686a7b8aec524d81bda4c572549a3a068ce0eed (patch) | |
tree | 2e6061c834b99e3b9668be8b3cfb1627251365d3 /src/math/sf_scalbn.c | |
parent | 6aa451ce81bfdfe679e3f9902043a5f0d235c745 (diff) | |
parent | cc528f1ff0271ec6488a1a7b91c731183502101e (diff) |
Merge branch 'master' of ssh://git.gag.com/scm/git/fw/altos
Diffstat (limited to 'src/math/sf_scalbn.c')
-rw-r--r-- | src/math/sf_scalbn.c | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/src/math/sf_scalbn.c b/src/math/sf_scalbn.c deleted file mode 100644 index 70006001..00000000 --- a/src/math/sf_scalbn.c +++ /dev/null @@ -1,86 +0,0 @@ -/* sf_scalbn.c -- float version of s_scalbn.c. - * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. - */ - -/* - * ==================================================== - * 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. - * ==================================================== - */ - -#include "fdlibm.h" -#include <limits.h> -#include <float.h> - -#if INT_MAX > 50000 -#define OVERFLOW_INT 50000 -#else -#define OVERFLOW_INT 30000 -#endif - -#ifdef __STDC__ -static const float -#else -static float -#endif -two25 = 3.355443200e+07, /* 0x4c000000 */ -twom25 = 2.9802322388e-08, /* 0x33000000 */ -huge = 1.0e+30, -tiny = 1.0e-30; - -#ifdef __STDC__ - float scalbnf (float x, int n) -#else - float scalbnf (x,n) - float x; int n; -#endif -{ - __int32_t k,ix; - __uint32_t hx; - - GET_FLOAT_WORD(ix,x); - hx = ix&0x7fffffff; - k = hx>>23; /* extract exponent */ - if (FLT_UWORD_IS_ZERO(hx)) - return x; - if (!FLT_UWORD_IS_FINITE(hx)) - return x+x; /* NaN or Inf */ - if (FLT_UWORD_IS_SUBNORMAL(hx)) { - x *= two25; - GET_FLOAT_WORD(ix,x); - k = ((ix&0x7f800000)>>23) - 25; - if (n< -50000) return tiny*x; /*underflow*/ - } - k = k+n; - if (k > FLT_LARGEST_EXP) return huge*copysignf(huge,x); /* overflow */ - if (k > 0) /* normal result */ - {SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); return x;} - if (k < FLT_SMALLEST_EXP) { - if (n > OVERFLOW_INT) /* in case integer overflow in n+k */ - return huge*copysignf(huge,x); /*overflow*/ - else return tiny*copysignf(tiny,x); /*underflow*/ - } - k += 25; /* subnormal result */ - SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); - return x*twom25; -} - -#ifdef _DOUBLE_IS_32BITS - -#ifdef __STDC__ - double scalbn(double x, int n) -#else - double scalbn(x,n) - double x; - int n; -#endif -{ - return (double) scalbnf((float) x, n); -} - -#endif /* defined(_DOUBLE_IS_32BITS) */ |