| /* sf_frexp.c -- float version of s_frexp.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" |
| |
| #ifdef __STDC__ |
| static const float |
| #else |
| static float |
| #endif |
| two25 = 3.3554432000e+07; /* 0x4c000000 */ |
| |
| #ifdef __STDC__ |
| float frexpf(float x, int *eptr) |
| #else |
| float frexpf(x, eptr) |
| float x; int *eptr; |
| #endif |
| { |
| __int32_t hx, ix; |
| GET_FLOAT_WORD(hx,x); |
| ix = 0x7fffffff&hx; |
| *eptr = 0; |
| if(!FLT_UWORD_IS_FINITE(ix)||FLT_UWORD_IS_ZERO(ix)) return x; /* 0,inf,nan */ |
| if (FLT_UWORD_IS_SUBNORMAL(ix)) { /* subnormal */ |
| x *= two25; |
| GET_FLOAT_WORD(hx,x); |
| ix = hx&0x7fffffff; |
| *eptr = -25; |
| } |
| *eptr += (ix>>23)-126; |
| hx = (hx&0x807fffff)|0x3f000000; |
| SET_FLOAT_WORD(x,hx); |
| return x; |
| } |
| |
| #ifdef _DOUBLE_IS_32BITS |
| |
| #ifdef __STDC__ |
| double frexp(double x, int *eptr) |
| #else |
| double frexp(x, eptr) |
| double x; int *eptr; |
| #endif |
| { |
| return (double) frexpf((float) x, eptr); |
| } |
| |
| #endif /* defined(_DOUBLE_IS_32BITS) */ |