author | Claus Gittinger <cg@exept.de> |
Thu, 27 Jun 2019 12:42:13 +0200 | |
branch | cvs_MAIN |
changeset 3920 | 47a7b4a23bee |
parent 2353 | fa7400d022a0 |
child 2380 | 9195eccdcbd9 |
permissions | -rw-r--r-- |
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Updated to https://swing.fit.cvut.cz/hg/stx.libjava/rev/31f8b995905e
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fa7400d022a0
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/* @(#)s_rint.c 1.3 95/01/18 */ |
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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 SunSoft, 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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|
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/* |
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* rint(x) |
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* Return x rounded to integral value according to the prevailing |
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* rounding mode. |
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* Method: |
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* Using floating addition. |
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* Exception: |
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* Inexact flag raised if x not equal to rint(x). |
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*/ |
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|
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#include "fdlibm.h" |
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|
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#ifdef __STDC__ |
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static const double |
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#else |
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static double |
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#endif |
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TWO52[2]={ |
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4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */ |
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-4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */ |
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}; |
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|
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#ifdef __STDC__ |
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double rint(double x) |
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#else |
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double rint(x) |
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double x; |
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#endif |
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{ |
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int i0,j0,sx; |
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unsigned i,i1; |
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double w,t; |
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i0 = __HI(x); |
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sx = (i0>>31)&1; |
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i1 = __LO(x); |
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j0 = ((i0>>20)&0x7ff)-0x3ff; |
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if(j0<20) { |
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if(j0<0) { |
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if(((i0&0x7fffffff)|i1)==0) return x; |
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i1 |= (i0&0x0fffff); |
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i0 &= 0xfffe0000; |
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i0 |= ((i1|-i1)>>12)&0x80000; |
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__HI(x)=i0; |
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w = TWO52[sx]+x; |
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t = w-TWO52[sx]; |
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i0 = __HI(t); |
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__HI(t) = (i0&0x7fffffff)|(sx<<31); |
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return t; |
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} else { |
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i = (0x000fffff)>>j0; |
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if(((i0&i)|i1)==0) return x; /* x is integral */ |
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i>>=1; |
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if(((i0&i)|i1)!=0) { |
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if(j0==19) i1 = 0x40000000; else |
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i0 = (i0&(~i))|((0x20000)>>j0); |
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} |
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} |
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} else if (j0>51) { |
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if(j0==0x400) return x+x; /* inf or NaN */ |
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else return x; /* x is integral */ |
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} else { |
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i = ((unsigned)(0xffffffff))>>(j0-20); |
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if((i1&i)==0) return x; /* x is integral */ |
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i>>=1; |
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if((i1&i)!=0) i1 = (i1&(~i))|((0x40000000)>>(j0-20)); |
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} |
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__HI(x) = i0; |
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__LO(x) = i1; |
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w = TWO52[sx]+x; |
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return w-TWO52[sx]; |
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84 |
} |