Module Name: src
Committed By: christos
Date: Sat Feb 9 22:32:47 UTC 2013
Added Files:
src/lib/libm/src: s_rintl.c
Log Message:
FreeBSD version
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/lib/libm/src/s_rintl.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Added files:
Index: src/lib/libm/src/s_rintl.c
diff -u /dev/null src/lib/libm/src/s_rintl.c:1.1
--- /dev/null Sat Feb 9 17:32:47 2013
+++ src/lib/libm/src/s_rintl.c Sat Feb 9 17:32:47 2013
@@ -0,0 +1,90 @@
+/*-
+ * Copyright (c) 2008 David Schultz <[email protected]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/msun/src/s_rintl.c,v 1.5 2008/02/22 11:59:05 bde Exp $");
+
+#include <float.h>
+#include <math.h>
+
+#include "fpmath.h"
+
+#if LDBL_MAX_EXP != 0x4000
+/* We also require the usual bias, min exp and expsign packing. */
+#error "Unsupported long double format"
+#endif
+
+#define BIAS (LDBL_MAX_EXP - 1)
+
+static const float
+shift[2] = {
+#if LDBL_MANT_DIG == 64
+ 0x1.0p63, -0x1.0p63
+#elif LDBL_MANT_DIG == 113
+ 0x1.0p112, -0x1.0p112
+#else
+#error "Unsupported long double format"
+#endif
+};
+static const float zero[2] = { 0.0, -0.0 };
+
+long double
+rintl(long double x)
+{
+ union IEEEl2bits u;
+ uint32_t expsign;
+ int ex, sign;
+
+ u.e = x;
+ expsign = u.xbits.expsign;
+ ex = expsign & 0x7fff;
+
+ if (ex >= BIAS + LDBL_MANT_DIG - 1) {
+ if (ex == BIAS + LDBL_MAX_EXP)
+ return (x + x); /* Inf, NaN, or unsupported format */
+ return (x); /* finite and already an integer */
+ }
+ sign = expsign >> 15;
+
+ /*
+ * The following code assumes that intermediate results are
+ * evaluated in long double precision. If they are evaluated in
+ * greater precision, double rounding may occur, and if they are
+ * evaluated in less precision (as on i386), results will be
+ * wildly incorrect.
+ */
+ x += shift[sign];
+ x -= shift[sign];
+
+ /*
+ * If the result is +-0, then it must have the same sign as x, but
+ * the above calculation doesn't always give this. Fix up the sign.
+ */
+ if (ex < BIAS && x == 0.0L)
+ return (zero[sign]);
+
+ return (x);
+}
