1 /* s_frexpf.c -- float version of s_frexp.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian (at) cygnus.com. 3 */ 4 5 /* 6 * ==================================================== 7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8 * 9 * Developed at SunPro, a Sun Microsystems, Inc. business. 10 * Permission to use, copy, modify, and distribute this 11 * software is freely granted, provided that this notice 12 * is preserved. 13 * ==================================================== 14 */ 15 16 #include <sys/cdefs.h> 17 __FBSDID("$FreeBSD$"); 18 19 #include "math.h" 20 #include "math_private.h" 21 22 static const float 23 two25 = 3.3554432000e+07; /* 0x4c000000 */ 24 25 float 26 frexpf(float x, int *eptr) 27 { 28 int32_t hx,ix; 29 GET_FLOAT_WORD(hx,x); 30 ix = 0x7fffffff&hx; 31 *eptr = 0; 32 if(ix>=0x7f800000||(ix==0)) return x; /* 0,inf,nan */ 33 if (ix<0x00800000) { /* subnormal */ 34 x *= two25; 35 GET_FLOAT_WORD(hx,x); 36 ix = hx&0x7fffffff; 37 *eptr = -25; 38 } 39 *eptr += (ix>>23)-126; 40 hx = (hx&0x807fffff)|0x3f000000; 41 SET_FLOAT_WORD(x,hx); 42 return x; 43 } 44
