first commit of the new libm!

[musl] / src / math / s_rint.c

diff --git a/src/math/s_rint.c b/src/math/s_rint.c
deleted file mode 100644 (file)
index aec7d3c..0000000
--- a/src/math/s_rint.c
+++ /dev/null
@@ -1,80 +0,0 @@
-/* @(#)s_rint.c 5.1 93/09/24 */
-/*
- * ====================================================
- * 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.
- * ====================================================
- */
-
-/*
- * rint(x)
- * Return x rounded to integral value according to the prevailing
- * rounding mode.
- * Method:
- *      Using floating addition.
- * Exception:
- *      Inexact flag raised if x not equal to rint(x).
- */
-
-#include <math.h>
-#include "math_private.h"
-
-/*
- * TWO23 is long double instead of double to avoid a bug in gcc.  Without
- * this, gcc thinks that TWO23[sx]+x and w-TWO23[sx] already have double
- * precision and doesn't clip them to double precision when they are
- * assigned and returned.
- */
-static const long double
-TWO52[2]={
-  4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
- -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
-};
-
-double
-rint(double x)
-{
-        int32_t i0,j0,sx;
-        uint32_t i,i1;
-        double w,t;
-        EXTRACT_WORDS(i0,i1,x);
-        sx = (i0>>31)&1;
-        j0 = ((i0>>20)&0x7ff)-0x3ff;
-        if(j0<20) {
-            if(j0<0) {
-                if(((i0&0x7fffffff)|i1)==0) return x;
-                i1 |= (i0&0x0fffff);
-                i0 &= 0xfffe0000;
-                i0 |= ((i1|-i1)>>12)&0x80000;
-                SET_HIGH_WORD(x,i0);
-                w = TWO52[sx]+x;
-                t =  w-TWO52[sx];
-                GET_HIGH_WORD(i0,t);
-                SET_HIGH_WORD(t,(i0&0x7fffffff)|(sx<<31));
-                return t;
-            } else {
-                i = (0x000fffff)>>j0;
-                if(((i0&i)|i1)==0) return x; /* x is integral */
-                i>>=1;
-                if(((i0&i)|i1)!=0) {
-                    if(j0==19) i1 = 0x40000000; else
-                    i0 = (i0&(~i))|((0x20000)>>j0);
-                }
-            }
-        } else if (j0>51) {
-            if(j0==0x400) return x+x;   /* inf or NaN */
-            else return x;              /* x is integral */
-        } else {
-            i = ((uint32_t)(0xffffffff))>>(j0-20);
-            if((i1&i)==0) return x;     /* x is integral */
-            i>>=1;
-            if((i1&i)!=0) i1 = (i1&(~i))|((0x40000000)>>(j0-20));
-        }
-        INSERT_WORDS(x,i0,i1);
-        w = TWO52[sx]+x;
-        return w-TWO52[sx];
-}