diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c deleted file mode 100644 index d517a919c8..0000000000 --- a/sysdeps/ieee754/dbl-64/wordsize-64/s_scalbn.c +++ /dev/null @@ -1,60 +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 -__scalbn (double x, int n) -{ - int64_t ix; - int64_t k; - EXTRACT_WORDS64(ix,x); - k = (ix >> 52) & 0x7ff; /* extract exponent */ - if (__builtin_expect(k==0, 0)) { /* 0 or subnormal x */ - if ((ix & UINT64_C(0xfffffffffffff))==0) return x; /* +-0 */ - x *= two54; - EXTRACT_WORDS64(ix,x); - k = ((ix >> 52) & 0x7ff) - 54; - } - if (__builtin_expect(k==0x7ff, 0)) return x+x; /* NaN or Inf */ - if (__builtin_expect(n< -50000, 0)) - return tiny*__copysign(tiny,x); /*underflow*/ - if (__builtin_expect(n> 50000 || k+n > 0x7fe, 0)) - return huge*__copysign(huge,x); /* overflow */ - /* Now k and n are bounded we know that k = k+n does not - overflow. */ - k = k+n; - if (__builtin_expect(k > 0, 1)) /* normal result */ - {INSERT_WORDS64(x,(ix&UINT64_C(0x800fffffffffffff))|(k<<52)); - return x;} - if (k <= -54) - return tiny*__copysign(tiny,x); /*underflow*/ - k += 54; /* subnormal result */ - INSERT_WORDS64(x,(ix&INT64_C(0x800fffffffffffff))|(k<<52)); - return x*twom54; -} -#ifdef NO_LONG_DOUBLE -strong_alias (__scalbn, __scalbnl) -#endif |