56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/* lroundf adapted to be llroundf for Newlib, 2009 by Craig Howland. */
|
|
/*
|
|
* ====================================================
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunPro, a Sun Microsystems, Inc. business.
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
* ====================================================
|
|
*/
|
|
|
|
#include "fdlibm.h"
|
|
|
|
long long int
|
|
llroundf(float x)
|
|
{
|
|
__int32_t exponent_less_127;
|
|
__uint32_t w;
|
|
long long int result;
|
|
__int32_t sign;
|
|
|
|
GET_FLOAT_WORD (w, x);
|
|
exponent_less_127 = ((w & 0x7f800000) >> 23) - 127;
|
|
sign = (w & 0x80000000) != 0 ? -1 : 1;
|
|
w &= 0x7fffff;
|
|
w |= 0x800000;
|
|
|
|
if (exponent_less_127 < (int)((8 * sizeof (long long int)) - 1))
|
|
{
|
|
if (exponent_less_127 < 0)
|
|
return exponent_less_127 < -1 ? 0 : sign;
|
|
else if (exponent_less_127 >= 23)
|
|
result = (long long int) w << (exponent_less_127 - 23);
|
|
else
|
|
{
|
|
w += 0x400000 >> exponent_less_127;
|
|
result = w >> (23 - exponent_less_127);
|
|
}
|
|
}
|
|
else
|
|
return (long long int) x;
|
|
|
|
return sign * result;
|
|
}
|
|
|
|
#ifdef _DOUBLE_IS_32BITS
|
|
|
|
long long int
|
|
llround(double x)
|
|
{
|
|
return llroundf((float) x);
|
|
}
|
|
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|