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Merge "Emit warnings when linking against imprecise math functions"

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This commit is contained in:
Calin Juravle 2014-04-03 09:01:04 +00:00 committed by Gerrit Code Review
commit 3868759314
3 changed files with 27 additions and 79 deletions
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1
libm/Android.mk
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@ -261,7 +261,6 @@ LOCAL_SRC_FILES_arm64 := arm64/fenv.c $(libm_ld_src_files)
LOCAL_C_INCLUDES_x86 := $(LOCAL_PATH)/i386 $(LOCAL_PATH)/i387
LOCAL_SRC_FILES_x86 := i387/fenv.c
LOCAL_CFLAGS_x86_64 := -include $(LOCAL_PATH)/fpmath.h
LOCAL_C_INCLUDES_x86_64 := $(LOCAL_PATH)/amd64 $(libm_ld_includes)
LOCAL_SRC_FILES_x86_64 := amd64/fenv.c $(libm_ld_src_files)

36
libm/fake_long_double.c
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@ -22,16 +22,34 @@ int (isinf)(double a1) { return __isinf(a1); }
int (isnanf)(float a1) { return __isnanf(a1); }
// FreeBSD falls back to the double variants of these functions as well.
long double coshl(long double a1) { return cosh(a1); }
long double erfcl(long double a1) { return erfc(a1); }
long double erfl(long double a1) { return erf(a1); }
long double lgammal(long double a1) { return lgamma(a1); }
/*
* On LP64 sizeof(long double) > sizeof(double) so functions which fall back
* to their double variants lose precision. Emit a warning whenever something
* links against such functions.
* On LP32 sizeof(long double) == sizeof(double) so we don't need to warn.
*/
#ifdef __LP64__
#define WARN_IMPRECISE(x) \
__warn_references(x, # x " has lower than advertised precision");
#else
#define WARN_IMPRECISE(x)
#endif //__LP64__
#define DECLARE_IMPRECISE(f) \
long double f ## l(long double v) { return f(v); } \
WARN_IMPRECISE(x)
DECLARE_IMPRECISE(cosh);
DECLARE_IMPRECISE(erfc);
DECLARE_IMPRECISE(erf);
DECLARE_IMPRECISE(lgamma);
DECLARE_IMPRECISE(sinh);
DECLARE_IMPRECISE(tanh);
DECLARE_IMPRECISE(tgamma);
DECLARE_IMPRECISE(significand);
long double powl(long double a1, long double a2) { return pow(a1, a2); }
long double sinhl(long double a1) { return sinh(a1); }
long double tanhl(long double a1) { return tanh(a1); }
long double tgammal(long double a1) { return tgamma(a1); }
long double significandl(long double a1) { return significand(a1); }
WARN_IMPRECISE(powl)
#ifndef __LP64__
/*

69
libm/upstream-freebsd/lib/msun/src/imprecise.c
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@ -1,69 +0,0 @@
/*-
* 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);