1 /* s_modff.c -- float version of s_modf.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 "math.h" 17 #include "math_private.h" 18 19 static const float one = 1.0; 20 21 float 22 modff(float x, float *iptr) 23 { 24 int32_t i0,j0; 25 u_int32_t i; 26 GET_FLOAT_WORD(i0,x); 27 j0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */ 28 if(j0<23) { /* integer part in x */ 29 if(j0<0) { /* |x|<1 */ 30 SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */ 31 return x; 32 } else { 33 i = (0x007fffff)>>j0; 34 if((i0&i)==0) { /* x is integral */ 35 u_int32_t ix; 36 *iptr = x; 37 GET_FLOAT_WORD(ix,x); 38 SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ 39 return x; 40 } else { 41 SET_FLOAT_WORD(*iptr,i0&(~i)); 42 return x - *iptr; 43 } 44 } 45 } else { /* no fraction part */ 46 u_int32_t ix; 47 *iptr = x*one; 48 if (x != x) /* NaN */ 49 return x; 50 GET_FLOAT_WORD(ix,x); 51 SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ 52 return x; 53 } 54 } 55