a0ee07829a
This brings us up to date with FreeBSD HEAD, fixes various bugs, unifies the set of functions we support on ARM, MIPS, and x86, fixes "long double", adds ISO C99 support, and adds basic unit tests. It turns out that our "long double" functions have always been broken for non-normal numbers. This patch fixes that by not using the upstream implementations and just forwarding to the regular "double" implementation instead (since "long double" on Android is just "double" anyway, which is what BSD doesn't support). All the tests pass on ARM, MIPS, and x86, plus glibc on x86-64. Bug: 3169850 Bug: 8012787 Bug: https://code.google.com/p/android/issues/detail?id=6697 Change-Id: If0c343030959c24bfc50d4d21c9530052c581837
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/* @(#)s_rint.c 5.1 93/09/24 */
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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 <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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#include <float.h>
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#include "math.h"
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#include "math_private.h"
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static const double
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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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double
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rint(double x)
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{
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int32_t i0,j0,sx;
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u_int32_t i,i1;
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double w,t;
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EXTRACT_WORDS(i0,i1,x);
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sx = (i0>>31)&1;
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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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SET_HIGH_WORD(x,i0);
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STRICT_ASSIGN(double,w,TWO52[sx]+x);
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t = w-TWO52[sx];
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GET_HIGH_WORD(i0,t);
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SET_HIGH_WORD(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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/*
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* Some bit is set after the 0.5 bit. To avoid the
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* possibility of errors from double rounding in
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* w = TWO52[sx]+x, adjust the 0.25 bit to a lower
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* guard bit. We do this for all j0<=51. The
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* adjustment is trickiest for j0==18 and j0==19
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* since then it spans the word boundary.
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*/
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if(j0==19) i1 = 0x40000000; else
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if(j0==18) i1 = 0x80000000; 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 = ((u_int32_t)(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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INSERT_WORDS(x,i0,i1);
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STRICT_ASSIGN(double,w,TWO52[sx]+x);
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return w-TWO52[sx];
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}
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#if (LDBL_MANT_DIG == 53)
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__weak_reference(rint, rintl);
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#endif
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