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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libm/] [math/] [sf_ceil.c] - Blame information for rev 1765

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1 39 lampret
/* sf_ceil.c -- float version of s_ceil.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 "fdlibm.h"
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#ifdef __STDC__
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static const float huge = 1.0e30;
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#else
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static float huge = 1.0e30;
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#endif
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#ifdef __STDC__
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        float ceilf(float x)
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#else
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        float ceilf(x)
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        float x;
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#endif
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{
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        __int32_t i0,j0;
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        __uint32_t i;
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        GET_FLOAT_WORD(i0,x);
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        j0 = ((i0>>23)&0xff)-0x7f;
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        if(j0<23) {
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            if(j0<0) {   /* raise inexact if x != 0 */
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                if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
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                    if(i0<0) {i0=0x80000000;}
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                    else if(i0!=0) { i0=0x3f800000;}
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                }
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            } else {
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                i = (0x007fffff)>>j0;
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                if((i0&i)==0) return x; /* x is integral */
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                if(huge+x>(float)0.0) { /* raise inexact flag */
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                    if(i0>0) i0 += (0x00800000)>>j0;
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                    i0 &= (~i);
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                }
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            }
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        } else {
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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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        SET_FLOAT_WORD(x,i0);
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        return x;
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}
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#ifdef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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        double ceil(double x)
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#else
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        double ceil(x)
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        double x;
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#endif
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{
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        return (double) ceilf((float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */

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