diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_scalbn.c')
-rw-r--r-- | sysdeps/ieee754/dbl-64/s_scalbn.c | 63 |
1 files changed, 0 insertions, 63 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_scalbn.c b/sysdeps/ieee754/dbl-64/s_scalbn.c deleted file mode 100644 index 58c7e1b33a..0000000000 --- a/sysdeps/ieee754/dbl-64/s_scalbn.c +++ /dev/null @@ -1,63 +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) -{ - int32_t k, hx, lx; - EXTRACT_WORDS (hx, lx, x); - k = (hx & 0x7ff00000) >> 20; /* extract exponent */ - if (__glibc_unlikely (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 (__glibc_unlikely (k == 0x7ff)) - return x + x; /* NaN or Inf */ - if (__glibc_unlikely (n < -50000)) - return tiny * __copysign (tiny, x); /*underflow*/ - if (__glibc_unlikely (n > 50000 || k + n > 0x7fe)) - 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 (__glibc_likely (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; -} -#ifdef NO_LONG_DOUBLE -strong_alias (__scalbn, __scalbnl) -#endif |