svn commit: r255294 - in head/lib/msun: . src

[David Chisnall]

Author: theraven
Date: Fri Sep  6 07:58:23 2013
New Revision: 255294
URL: http://svnweb.freebsd.org/changeset/base/255294

Log:
  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.

Added:
  head/lib/msun/src/imprecise.c   (contents, props changed)
Modified:
  head/lib/msun/Makefile
  head/lib/msun/Symbol.map

Modified: head/lib/msun/Makefile
==============================================================================
--- head/lib/msun/Makefile	Fri Sep  6 05:58:10 2013	(r255293)
+++ head/lib/msun/Makefile	Fri Sep  6 07:58:23 2013	(r255294)
@@ -53,6 +53,7 @@ COMMON_SRCS= b_exp.c b_log.c b_tgamma.c 
 	e_pow.c e_powf.c e_rem_pio2.c \
 	e_rem_pio2f.c e_remainder.c e_remainderf.c e_scalb.c e_scalbf.c \
 	e_sinh.c e_sinhf.c e_sqrt.c e_sqrtf.c fenv.c \
+	imprecise.c \
 	k_cos.c k_cosf.c k_exp.c k_expf.c k_rem_pio2.c k_sin.c k_sinf.c \
 	k_tan.c k_tanf.c \
 	s_asinh.c s_asinhf.c s_atan.c s_atanf.c s_carg.c s_cargf.c s_cargl.c \

Modified: head/lib/msun/Symbol.map
==============================================================================
--- head/lib/msun/Symbol.map	Fri Sep  6 05:58:10 2013	(r255293)
+++ head/lib/msun/Symbol.map	Fri Sep  6 07:58:23 2013	(r255294)
@@ -270,4 +270,13 @@ FBSD_1.3 {
 	log1pl;
 	log2l;
 	logl;
+	# Implemented as weak aliases for imprecise versions
+	coshl;
+	erfcl;
+	erfl;
+	lgammal;
+	powl;
+	sinhl;
+	tanhl;
+	tgammal;
 };

Added: head/lib/msun/src/imprecise.c
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/lib/msun/src/imprecise.c	Fri Sep  6 07:58:23 2013	(r255294)
@@ -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);