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 <sys/cdefs.h> 17 #include "math.h" 18 #include "math_private.h" 19 20 static const float one = 1.0; 21 22 float 23 modff(float x, float *iptr) 24 { 25 int32_t i0,j0; 26 u_int32_t i; 27 GET_FLOAT_WORD(i0,x); 28 j0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */ 29 if(j0<23) { /* integer part in x */ 30 if(j0<0) { /* |x|<1 */ 31 SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */ 32 return x; 33 } else { 34 i = (0x007fffff)>>j0; 35 if((i0&i)==0) { /* x is integral */ 36 u_int32_t ix; 37 *iptr = x; 38 GET_FLOAT_WORD(ix,x); 39 SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ 40 return x; 41 } else { 42 SET_FLOAT_WORD(*iptr,i0&(~i)); 43 return x - *iptr; 44 } 45 } 46 } else { /* no fraction part */ 47 u_int32_t ix; 48 *iptr = x*one; 49 if (x != x) /* NaN */ 50 return x; 51 GET_FLOAT_WORD(ix,x); 52 SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ 53 return x; 54 } 55 } 56