From c8fcb04ad95386fea45e2cc0ad7277e5c9a27f4d Mon Sep 17 00:00:00 2001
From: theraven <theraven@FreeBSD.org>
Date: Fri, 6 Sep 2013 07:58:23 +0000
Subject: Add stub implementations of the missing C++11 math functions. These
 are weak and so can be replaced by other versions in applications that choose
 to do so, and will give a linker warning when used so that applications that
 rely on the extra precision can avoid them.

Note that since the C/C++ specs only guarantee that long double has
precision equal to double, code that actually relies on these functions
having greater precision is unportable at best and broken at worst.
---
 lib/msun/src/imprecise.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 lib/msun/src/imprecise.c

(limited to 'lib/msun/src/imprecise.c')

diff --git a/lib/msun/src/imprecise.c b/lib/msun/src/imprecise.c
new file mode 100644
index 0000000..a7503bf
--- /dev/null
+++ b/lib/msun/src/imprecise.c
@@ -0,0 +1,69 @@
+/*-
+ * Copyright (c) 2013 David Chisnall
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <float.h>
+#include <math.h>
+
+/*
+ * If long double is not the same size as double, then these will lose
+ * precision and we should emit a warning whenever something links against
+ * them.
+ */
+#if (LDBL_MANT_DIG > 53)
+#define WARN_IMPRECISE(x) \
+	__warn_references(x, # x " has lower than advertised precision");
+#else
+#define WARN_IMPRECISE(x)
+#endif
+/*
+ * Declare the functions as weak variants so that other libraries providing
+ * real versions can override them.
+ */
+#define	DECLARE_WEAK(x)\
+	__weak_reference(imprecise_## x, x);\
+	WARN_IMPRECISE(x)
+
+long double
+imprecise_powl(long double x, long double y)
+{
+
+	return pow(x, y);
+}
+DECLARE_WEAK(powl);
+
+#define DECLARE_IMPRECISE(f) \
+	long double imprecise_ ## f ## l(long double v) { return f(v); }\
+	DECLARE_WEAK(f ## l)
+
+DECLARE_IMPRECISE(cosh);
+DECLARE_IMPRECISE(erfc);
+DECLARE_IMPRECISE(erf);
+DECLARE_IMPRECISE(lgamma);
+DECLARE_IMPRECISE(sinh);
+DECLARE_IMPRECISE(tanh);
+DECLARE_IMPRECISE(tgamma);
-- 
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