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https://github.com/KolibriOS/kolibrios.git
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56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
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/* lroundf adapted to be llroundf for Newlib, 2009 by Craig Howland. */
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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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long long int
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llroundf(float x)
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{
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__int32_t exponent_less_127;
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__uint32_t w;
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long long int result;
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__int32_t sign;
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GET_FLOAT_WORD (w, x);
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exponent_less_127 = ((w & 0x7f800000) >> 23) - 127;
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sign = (w & 0x80000000) != 0 ? -1 : 1;
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w &= 0x7fffff;
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w |= 0x800000;
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if (exponent_less_127 < (int)((8 * sizeof (long long int)) - 1))
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{
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if (exponent_less_127 < 0)
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return exponent_less_127 < -1 ? 0 : sign;
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else if (exponent_less_127 >= 23)
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result = (long long int) w << (exponent_less_127 - 23);
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else
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{
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w += 0x400000 >> exponent_less_127;
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result = w >> (23 - exponent_less_127);
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}
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}
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else
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return (long long int) x;
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return sign * result;
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}
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#ifdef _DOUBLE_IS_32BITS
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long long int
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llround(double x)
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{
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return llroundf((float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */
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