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Add stub implementations of the missing C++11 math functions.

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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.
This commit is contained in:
David Chisnall 2013-09-06 07:58:23 +00:00
parent fa48032049
commit 4758b87596
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=255294
3 changed files with 79 additions and 0 deletions
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1
lib/msun/Makefile
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@ -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 \

9
lib/msun/Symbol.map
View File

@ -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;
};

69
lib/msun/src/imprecise.c Normal file
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@ -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);