1 files changed, 87 insertions, 0 deletions
diff --git a/modules/fdlibm/src/s_rint.cpp b/modules/fdlibm/src/s_rint.cpp
new file mode 100644
index 000000000..19171f87f
--- /dev/null
+++ b/modules/fdlibm/src/s_rint.cpp
@@ -0,0 +1,87 @@
+/* @(#)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.
+ * ====================================================
+ */
+
+//#include <sys/cdefs.h>
+//__FBSDID("$FreeBSD$");
+
+/*
+ * 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 <float.h>
+
+#include "math_private.h"
+
+static const double
+TWO52[2]={
+  4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
+ -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
+};
+
+double
+rint(double x)
+{
+	int32_t i0,j0,sx;
+	u_int32_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);
+	        STRICT_ASSIGN(double,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) {
+		    /*
+		     * Some bit is set after the 0.5 bit.  To avoid the
+		     * possibility of errors from double rounding in
+		     * w = TWO52[sx]+x, adjust the 0.25 bit to a lower
+		     * guard bit.  We do this for all j0<=51.  The
+		     * adjustment is trickiest for j0==18 and j0==19
+		     * since then it spans the word boundary.
+		     */
+		    if(j0==19) i1 = 0x40000000; else
+		    if(j0==18) i1 = 0x80000000; 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 = ((u_int32_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);
+	STRICT_ASSIGN(double,w,TWO52[sx]+x);
+	return w-TWO52[sx];
+}