s_rintf.c revision 176451
12116Sjkh/* s_rintf.c -- float version of s_rint.c. 22116Sjkh * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 32116Sjkh */ 42116Sjkh 52116Sjkh/* 62116Sjkh * ==================================================== 72116Sjkh * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 82116Sjkh * 92116Sjkh * Developed at SunPro, a Sun Microsystems, Inc. business. 102116Sjkh * Permission to use, copy, modify, and distribute this 118870Srgrimes * software is freely granted, provided that this notice 122116Sjkh * is preserved. 132116Sjkh * ==================================================== 142116Sjkh */ 152116Sjkh 16176451Sdas#include <sys/cdefs.h> 17176451Sdas__FBSDID("$FreeBSD: head/lib/msun/src/s_rintf.c 176451 2008-02-22 02:30:36Z das $"); 182116Sjkh 19175480Sbde#include <float.h> 20175480Sbde#include <stdint.h> 21175480Sbde 222116Sjkh#include "math.h" 232116Sjkh#include "math_private.h" 242116Sjkh 25130285Sdasstatic const float 262116SjkhTWO23[2]={ 272116Sjkh 8.3886080000e+06, /* 0x4b000000 */ 282116Sjkh -8.3886080000e+06, /* 0xcb000000 */ 292116Sjkh}; 302116Sjkh 3197413Salfredfloat 3297413Salfredrintf(float x) 332116Sjkh{ 342116Sjkh int32_t i0,j0,sx; 35175480Sbde float w,t; 362116Sjkh GET_FLOAT_WORD(i0,x); 372116Sjkh sx = (i0>>31)&1; 382116Sjkh j0 = ((i0>>23)&0xff)-0x7f; 392116Sjkh if(j0<23) { 408870Srgrimes if(j0<0) { 412116Sjkh if((i0&0x7fffffff)==0) return x; 42175480Sbde STRICT_ASSIGN(float,w,TWO23[sx]+x); 432116Sjkh t = w-TWO23[sx]; 44153046Sbde GET_FLOAT_WORD(i0,t); 45153046Sbde SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31)); 462116Sjkh return t; 472116Sjkh } 48175480Sbde STRICT_ASSIGN(float,w,TWO23[sx]+x); 49130285Sdas return w-TWO23[sx]; 502116Sjkh } 51130285Sdas if(j0==0x80) return x+x; /* inf or NaN */ 52130285Sdas else return x; /* x is integral */ 532116Sjkh} 54