54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/* s_rintf.c -- float version of s_rint.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include "cdefs-compat.h"
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//__FBSDID("$FreeBSD: src/lib/msun/src/s_rintf.c,v 1.12 2008/02/22 02:30:35 das Exp $");
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#include <float.h>
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#include <openlibm_math.h>
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#include <stdint.h>
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#include "math_private.h"
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static const float
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TWO23[2]={
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8.3886080000e+06, /* 0x4b000000 */
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-8.3886080000e+06, /* 0xcb000000 */
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};
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OLM_DLLEXPORT float
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rintf(float x)
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{
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int32_t i0,j0,sx;
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float w,t;
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GET_FLOAT_WORD(i0,x);
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sx = (i0>>31)&1;
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j0 = ((i0>>23)&0xff)-0x7f;
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if(j0<23) {
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if(j0<0) {
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if((i0&0x7fffffff)==0) return x;
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STRICT_ASSIGN(float,w,TWO23[sx]+x);
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t = w-TWO23[sx];
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GET_FLOAT_WORD(i0,t);
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SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31));
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return t;
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}
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STRICT_ASSIGN(float,w,TWO23[sx]+x);
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return w-TWO23[sx];
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}
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if(j0==0x80) return x+x; /* inf or NaN */
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else return x; /* x is integral */
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}
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