/* s_rintf.c -- float version of s_rint.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_rintf.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 #else static float #endif TWO23[2]={ 8.3886080000e+06, /* 0x4b000000 */ -8.3886080000e+06, /* 0xcb000000 */ }; #ifdef __STDC__ float rintf(float x) #else float rintf(x) float x; #endif { int32_t i0,j0,sx; u_int32_t i,i1; float w,t; GET_FLOAT_WORD(i0,x); sx = (i0>>31)&1; j0 = ((i0>>23)&0xff)-0x7f; if(j0<23) { if(j0<0) { if((i0&0x7fffffff)==0) return x; i1 = (i0&0x07fffff); i0 &= 0xfff00000; i0 |= ((i1|-i1)>>9)&0x400000; SET_FLOAT_WORD(x,i0); w = TWO23[sx]+x; t = w-TWO23[sx]; GET_FLOAT_WORD(i0,t); SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31)); return t; } else { i = (0x007fffff)>>j0; if((i0&i)==0) return x; /* x is integral */ i>>=1; if((i0&i)!=0) i0 = (i0&(~i))|((0x100000)>>j0); } } else { if(j0==0x80) return x+x; /* inf or NaN */ else return x; /* x is integral */ } SET_FLOAT_WORD(x,i0); w = TWO23[sx]+x; return w-TWO23[sx]; }