/* 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. * ==================================================== */ //#include <sys/cdefs.h> //__FBSDID("$FreeBSD$"); #include <float.h> #include <stdint.h> #include "math_private.h" static const float TWO23[2]={ 8.3886080000e+06, /* 0x4b000000 */ -8.3886080000e+06, /* 0xcb000000 */ }; float rintf(float x) { int32_t i0,j0,sx; 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; STRICT_ASSIGN(float,w,TWO23[sx]+x); t = w-TWO23[sx]; GET_FLOAT_WORD(i0,t); SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31)); return t; } STRICT_ASSIGN(float,w,TWO23[sx]+x); return w-TWO23[sx]; } if(j0==0x80) return x+x; /* inf or NaN */ else return x; /* x is integral */ }