/* 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. * ==================================================== */ #include <sys/cdefs.h> #if defined(LIBM_SCCS) && !defined(lint) __RCSID("$NetBSD: s_modff.c,v 1.9 2010/01/27 14:07:41 drochner Exp $"); #endif #include "math.h" #include "math_private.h" static const float one = 1.0; float modff(float x, float *iptr) { int32_t i0,jj0; u_int32_t i; GET_FLOAT_WORD(i0,x); jj0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */ if(jj0<23) { /* integer part in x */ if(jj0<0) { /* |x|<1 */ SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */ return x; } else { i = (0x007fffff)>>jj0; 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; if (jj0 == 0x80) /* +-inf or NaN */ return 0.0 / x; /* +-0 or NaN */ GET_FLOAT_WORD(ix,x); SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ return x; } } |