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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libm/] [common/] [sf_rint.c] - Rev 816
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/* sf_rint.c -- float version of s_rint.c. * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. */ /* * ==================================================== * 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" #ifdef __STDC__ static const float #else static float #endif TWO23[2]={ 8.3886080000e+06, /* 0x4b000000 */ -8.3886080000e+06, /* 0xcb000000 */ }; #ifdef __STDC__ float rintf(float x) #else float rintf(x) float x; #endif { __int32_t i0,j0,sx; __uint32_t i,i1,ix; float t; volatile float w; GET_FLOAT_WORD(i0,x); sx = (i0>>31)&1; ix = (i0&0x7fffffff); j0 = (ix>>23)-0x7f; if(j0<23) { if(FLT_UWORD_IS_ZERO(ix)) return x; if(j0<0) { i1 = (i0&0x07fffff); i0 &= 0xfff00000; i0 |= ((i1|-i1)>>9)&0x400000; SET_FLOAT_WORD(x,i0); w = TWO23[sx]+x; t = w-TWO23[sx]; GET_FLOAT_WORD(i0,t); SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31)); return t; } else { i = (0x007fffff)>>j0; if((i0&i)==0) return x; /* x is integral */ i>>=1; if((i0&i)!=0) i0 = (i0&(~i))|((0x100000)>>j0); } } else { if(!FLT_UWORD_IS_FINITE(ix)) return x+x; /* inf or NaN */ else return x; /* x is integral */ } SET_FLOAT_WORD(x,i0); w = TWO23[sx]+x; return w-TWO23[sx]; } #ifdef _DOUBLE_IS_32BITS #ifdef __STDC__ double rint(double x) #else double rint(x) double x; #endif { return (double) rintf((float) x); } #endif /* defined(_DOUBLE_IS_32BITS) */
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