/* s_modff.c -- float version of s_modf.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. * ==================================================== */ #ifndef lint static char rcsid[] = "$Id: s_modff.c,v 1.1.1.1 1994/08/19 09:39:58 jkh Exp $"; #endif #include "math.h" #include "math_private.h" #ifdef __STDC__ static const float one = 1.0; #else static float one = 1.0; #endif #ifdef __STDC__ float modff(float x, float *iptr) #else float modff(x, iptr) float x,*iptr; #endif { int32_t i0,j0; u_int32_t i; GET_FLOAT_WORD(i0,x); j0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */ if(j0<23) { /* integer part in x */ if(j0<0) { /* |x|<1 */ SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */ return x; } else { i = (0x007fffff)>>j0; if((i0&i)==0) { /* x is integral */ u_int32_t ix; *iptr = x; GET_FLOAT_WORD(ix,x); SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ return x; } else { SET_FLOAT_WORD(*iptr,i0&(~i)); return x - *iptr; } } } else { /* no fraction part */ u_int32_t ix; *iptr = x*one; GET_FLOAT_WORD(ix,x); SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ return x; } }