mirror of
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55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/* origin: FreeBSD /usr/src/lib/msun/src/s_ceilf.c */
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/*
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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 "libm.h"
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static const float huge = 1.0e30;
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float ceilf(float x)
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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) {
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/* raise inexact if x != 0 */
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if (huge+x > 0.0f) {
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if (i0 < 0)
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i0 = 0x80000000;
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else if(i0 != 0)
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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)
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return x; /* x is integral */
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/* raise inexact flag */
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if (huge+x > 0.0f) {
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if (i0 > 0)
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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) /* inf or NaN */
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return x+x;
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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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