1 /* s_frexpf.c -- float version of s_frexp.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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 #include "math.h" 18 #include "math_private.h" 19 20 static const float 21 two25 = 3.3554432000e+07; /* 0x4c000000 */ 22 23 float 24 frexpf(float x, int *eptr) 25 { 26 int32_t hx,ix; 27 GET_FLOAT_WORD(hx,x); 28 ix = 0x7fffffff&hx; 29 *eptr = 0; 30 if(ix>=0x7f800000||(ix==0)) return x; /* 0,inf,nan */ 31 if (ix<0x00800000) { /* subnormal */ 32 x *= two25; 33 GET_FLOAT_WORD(hx,x); 34 ix = hx&0x7fffffff; 35 *eptr = -25; 36 } 37 *eptr += (ix>>23)-126; 38 hx = (hx&0x807fffff)|0x3f000000; 39 SET_FLOAT_WORD(x,hx); 40 return x; 41 } 42