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am 76ba8e86: Merge "Reimplement isinf/isnan/fpclassify."

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* commit '76ba8e86d509594d861687110bbae265904da33b':
  Reimplement isinf/isnan/fpclassify.
This commit is contained in:
Elliott Hughes 2014-04-14 21:42:51 +00:00 committed by Android Git Automerger
commit cf2c663937
13 changed files with 300 additions and 296 deletions
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109
benchmarks/math_benchmark.cpp
View File

@ -60,3 +60,112 @@ static void BM_math_logb(int iters) {
StopBenchmarkTiming();
}
BENCHMARK(BM_math_logb);
static void BM_math_isinf_NORMAL(int iters) {
StartBenchmarkTiming();
d = 0.0;
v = 1234.0; // FP_NORMAL
for (int i = 0; i < iters; ++i) {
d += (isinf)(v);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_math_isinf_NORMAL);
static void BM_math_isinf_NAN(int iters) {
StartBenchmarkTiming();
d = 0.0;
v = nan(""); // FP_NAN
for (int i = 0; i < iters; ++i) {
d += (isinf)(v);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_math_isinf_NAN);
static void BM_math_isinf_INFINITE(int iters) {
StartBenchmarkTiming();
d = 0.0;
v = HUGE_VAL; // FP_INFINITE
for (int i = 0; i < iters; ++i) {
d += (isinf)(v);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_math_isinf_INFINITE);
static void BM_math_isinf_ZERO(int iters) {
StartBenchmarkTiming();
d = 0.0;
v = 0.0; // FP_ZERO
for (int i = 0; i < iters; ++i) {
d += (isinf)(v);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_math_isinf_ZERO);
static void BM_math_fpclassify_NORMAL(int iters) {
StartBenchmarkTiming();
d = 0.0;
v = 1234.0; // FP_NORMAL
for (int i = 0; i < iters; ++i) {
d += fpclassify(v);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_math_fpclassify_NORMAL);
static void BM_math_fpclassify_NAN(int iters) {
StartBenchmarkTiming();
d = 0.0;
v = nan(""); // FP_NAN
for (int i = 0; i < iters; ++i) {
d += fpclassify(v);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_math_fpclassify_NAN);
static void BM_math_fpclassify_INFINITE(int iters) {
StartBenchmarkTiming();
d = 0.0;
v = HUGE_VAL; // FP_INFINITE
for (int i = 0; i < iters; ++i) {
d += fpclassify(v);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_math_fpclassify_INFINITE);
static void BM_math_fpclassify_ZERO(int iters) {
StartBenchmarkTiming();
d = 0.0;
v = 0.0; // FP_ZERO
for (int i = 0; i < iters; ++i) {
d += fpclassify(v);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_math_fpclassify_ZERO);

3
libc/Android.mk
View File

@ -132,6 +132,7 @@ libc_bionic_src_files := \
bionic/ffs.cpp \
bionic/flockfile.cpp \
bionic/fork.cpp \
bionic/fpclassify.cpp \
bionic/futimens.cpp \
bionic/getauxval.cpp \
bionic/getcwd.cpp \
@ -547,7 +548,7 @@ LOCAL_SRC_FILES := $(libc_upstream_freebsd_src_files)
LOCAL_CFLAGS := \
$(libc_common_cflags) \
-I$(LOCAL_PATH)/upstream-freebsd \
-I$(LOCAL_PATH)/upstream-freebsd/libc/include \
-I$(LOCAL_PATH)/upstream-freebsd/lib/libc/include \
-include upstream-freebsd/freebsd-compat.h
LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
LOCAL_CPPFLAGS := $(libc_common_cppflags)

19
libc/arch-arm/include/machine/ieee.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ieee.h,v 1.1 2004/02/01 05:09:49 drahn Exp $ */
/* $OpenBSD: ieee.h,v 1.4 2011/11/08 17:06:51 deraadt Exp $ */
/* $NetBSD: ieee.h,v 1.2 2001/02/21 17:43:50 bjh21 Exp $ */
/*
@ -92,35 +92,36 @@
#define SNG_FRACBITS 23
#define DBL_EXPBITS 11
#define DBL_FRACHBITS 20
#define DBL_FRACLBITS 32
#define DBL_FRACBITS 52
#ifndef __VFP_FP__
#define E80_EXPBITS 15
#define E80_FRACHBITS 31
#define E80_FRACLBITS 32
#define E80_FRACBITS 64
#define EXT_EXPBITS 15
#define EXT_FRACHBITS 16
#define EXT_FRACHMBITS 32
#define EXT_FRACLMBITS 32
#define EXT_FRACLBITS 32
#define EXT_FRACBITS 112
#endif
struct ieee_single {
u_int sng_frac:23;
u_int sng_exponent:8;
u_int sng_exp:8;
u_int sng_sign:1;
};
#ifdef __VFP_FP__
struct ieee_double {
#ifdef __ARMEB__
u_int dbl_sign:1;
u_int dbl_exp:11;
u_int dbl_frach:20;
u_int dbl_fracl;
#else /* !__ARMEB__ */
u_int dbl_fracl;
u_int dbl_frach:20;
u_int dbl_exp:11;
u_int dbl_sign:1;
#endif /* !__ARMEB__ */
};
#else /* !__VFP_FP__ */
struct ieee_double {

19
libc/arch-arm64/include/machine/ieee.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ieee.h,v 1.1 2004/02/01 05:09:49 drahn Exp $ */
/* $OpenBSD: ieee.h,v 1.4 2011/11/08 17:06:51 deraadt Exp $ */
/* $NetBSD: ieee.h,v 1.2 2001/02/21 17:43:50 bjh21 Exp $ */
/*
@ -92,35 +92,36 @@
#define SNG_FRACBITS 23
#define DBL_EXPBITS 11
#define DBL_FRACHBITS 20
#define DBL_FRACLBITS 32
#define DBL_FRACBITS 52
#ifndef __VFP_FP__
#define E80_EXPBITS 15
#define E80_FRACHBITS 31
#define E80_FRACLBITS 32
#define E80_FRACBITS 64
#define EXT_EXPBITS 15
#define EXT_FRACHBITS 16
#define EXT_FRACHMBITS 32
#define EXT_FRACLMBITS 32
#define EXT_FRACLBITS 32
#define EXT_FRACBITS 112
#endif
struct ieee_single {
u_int sng_frac:23;
u_int sng_exponent:8;
u_int sng_exp:8;
u_int sng_sign:1;
};
#ifdef __VFP_FP__
struct ieee_double {
#ifdef __AARCH64EB__
u_int dbl_sign:1;
u_int dbl_exp:11;
u_int dbl_frach:20;
u_int dbl_fracl;
#else /* !__AARCH64EB__ */
u_int dbl_fracl;
u_int dbl_frach:20;
u_int dbl_exp:11;
u_int dbl_sign:1;
#endif /* !__AARCH64EB__ */
};
#else /* !__VFP_FP__ */
struct ieee_double {

18
libc/arch-x86/include/machine/ieee.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ieee.h,v 1.2 2003/06/02 23:27:47 millert Exp $ */
/* $OpenBSD: ieee.h,v 1.3 2008/09/07 20:36:06 martynas Exp $ */
/* $NetBSD: ieee.h,v 1.1 1996/09/30 16:34:25 ws Exp $ */
/*
@ -79,10 +79,19 @@
#define SNG_FRACBITS 23
#define DBL_EXPBITS 11
#define DBL_FRACHBITS 20
#define DBL_FRACLBITS 32
#define DBL_FRACBITS 52
#define EXT_EXPBITS 15
#define EXT_FRACBITS 112
#define EXT_FRACHBITS 32
#define EXT_FRACLBITS 32
#define EXT_FRACBITS 64
#define EXT_TO_ARRAY32(p, a) do { \
(a)[0] = (uint32_t)(p)->ext_fracl; \
(a)[1] = (uint32_t)(p)->ext_frach; \
} while(0)
struct ieee_single {
u_int sng_frac:23;
@ -99,11 +108,10 @@ struct ieee_double {
struct ieee_ext {
u_int ext_fracl;
u_int ext_fraclm;
u_int ext_frachm;
u_int ext_frach:16;
u_int ext_frach;
u_int ext_exp:15;
u_int ext_sign:1;
u_int ext_pad:16;
};
/*

138
libc/bionic/fpclassify.cpp Normal file
View File

@ -0,0 +1,138 @@
/*
* Copyright (C) 2014 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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/types.h>
#include <math.h>
#include <machine/ieee.h>
// These aren't declared in our <math.h>.
extern "C" int __isinf(double);
extern "C" int __isnan(double);
union float_u {
float f;
ieee_single bits;
};
union double_u {
double d;
ieee_double bits;
};
int __fpclassifyd(double d) {
double_u u;
u.d = d;
if (u.bits.dbl_exp == 0) {
return ((u.bits.dbl_fracl | u.bits.dbl_frach) == 0) ? FP_ZERO : FP_SUBNORMAL;
}
if (u.bits.dbl_exp == DBL_EXP_INFNAN) {
return ((u.bits.dbl_fracl | u.bits.dbl_frach) == 0) ? FP_INFINITE : FP_NAN;
}
return FP_NORMAL;
}
__strong_alias(__fpclassify, __fpclassifyd); // glibc uses __fpclassify, BSD __fpclassifyd.
int __fpclassifyf(float f) {
float_u u;
u.f = f;
if (u.bits.sng_exp == 0) {
return (u.bits.sng_frac == 0) ? FP_ZERO : FP_SUBNORMAL;
}
if (u.bits.sng_exp == SNG_EXP_INFNAN) {
return (u.bits.sng_frac == 0) ? FP_INFINITE : FP_NAN;
}
return FP_NORMAL;
}
int __isinf(double d) {
return (__fpclassifyd(d) == FP_INFINITE);
}
__strong_alias(isinf, __isinf);
int __isinff(float f) {
return (__fpclassifyf(f) == FP_INFINITE);
}
__strong_alias(isinff, __isinff);
int __isnan(double d) {
return (__fpclassifyd(d) == FP_NAN);
}
__strong_alias(isnan, __isnan);
int __isnanf(float f) {
return (__fpclassifyf(f) == FP_NAN);
}
__strong_alias(isnanf, __isnanf);
#if __LP64__
// LP64 uses 128-bit long doubles.
union long_double_u {
long double ld;
struct {
unsigned long fracl:64;
unsigned long frach:48;
unsigned int exp:15;
unsigned int sign:1;
} bits;
};
int __fpclassifyl(long double ld) {
long_double_u u;
u.ld = ld;
if (u.bits.exp == 0) {
return ((u.bits.fracl | u.bits.frach) == 0) ? FP_ZERO : FP_SUBNORMAL;
}
if (u.bits.exp == EXT_EXP_INFNAN) {
return ((u.bits.fracl | u.bits.frach) == 0) ? FP_INFINITE : FP_NAN;
}
return FP_NORMAL;
}
int __isinfl(long double ld) {
return (__fpclassifyl(ld) == FP_INFINITE);
}
int __isnanl(long double ld) {
return (__fpclassifyl(ld) == FP_NAN);
}
#else
// LP32 uses double as long double.
__strong_alias(__fpclassifyl, __fpclassify);
__strong_alias(__isinfl, __isinf);
__strong_alias(__isnanl, __isnan);
#endif
__strong_alias(isinfl, __isinfl);
__strong_alias(isnanl, __isnanl);

35
libc/stdio/vfprintf.c
View File

@ -154,12 +154,6 @@ static int exponent(char *, int, int);
#define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */
/* BIONIC: do not link libm for only two rather simple functions */
#ifdef FLOATING_POINT
static int _my_isinf(double);
static int _my_isnan(double);
#endif
/*
* Macros for converting digits to letters and vice versa
*/
@ -543,14 +537,14 @@ reswitch: switch (ch) {
}
/* do this before tricky precision changes */
if (_my_isinf(_double)) {
if (isinf(_double)) {
if (_double < 0)
sign = '-';
cp = "Inf";
size = 3;
break;
}
if (_my_isnan(_double)) {
if (isnan(_double)) {
cp = "NaN";
size = 3;
break;
@ -1331,29 +1325,4 @@ exponent(char *p0, int exp, int fmtch)
return (p - p0);
}
/* BIONIC */
#include <machine/ieee.h>
typedef union {
double d;
struct ieee_double i;
} ieee_u;
static int
_my_isinf (double value)
{
ieee_u u;
u.d = value;
return (u.i.dbl_exp == 2047 && u.i.dbl_frach == 0 && u.i.dbl_fracl == 0);
}
static int
_my_isnan (double value)
{
ieee_u u;
u.d = value;
return (u.i.dbl_exp == 2047 && (u.i.dbl_frach != 0 || u.i.dbl_fracl != 0));
}
#endif /* FLOATING_POINT */

8
libm/Android.mk
View File

@ -1,10 +1,10 @@
LOCAL_PATH:= $(call my-dir)
# TODO: these come from from upstream's libc, not libm!
# TODO: this comes from from upstream's libc, not libm, but it's an
# implementation detail that should have hidden visibility, so it needs
# to be in whatever library the math code is in.
libm_common_src_files := \
digittoint.c \
fpclassify.c \
isinf.c \
# TODO: this is not in the BSDs.
libm_common_src_files += \
@ -129,7 +129,6 @@ libm_common_src_files += \
upstream-freebsd/lib/msun/src/s_ilogb.c \
upstream-freebsd/lib/msun/src/s_ilogbf.c \
upstream-freebsd/lib/msun/src/s_isfinite.c \
upstream-freebsd/lib/msun/src/s_isnan.c \
upstream-freebsd/lib/msun/src/s_isnormal.c \
upstream-freebsd/lib/msun/src/s_llrint.c \
upstream-freebsd/lib/msun/src/s_llrintf.c \
@ -237,6 +236,7 @@ libm_common_cflags := \
-include $(LOCAL_PATH)/freebsd-compat.h \
libm_common_includes := $(LOCAL_PATH)/upstream-freebsd/lib/msun/src/
libm_ld_includes := $(LOCAL_PATH)/upstream-freebsd/lib/msun/ld128/
#

8
libm/fake_long_double.c
View File

@ -17,11 +17,6 @@
#include <float.h>
#include <math.h>
extern int __isinf(double); /* isinf.c */
int (isinf)(double a1) { return __isinf(a1); }
int (isnanf)(float a1) { return __isnanf(a1); }
/*
* On LP64 sizeof(long double) > sizeof(double) so functions which fall back
* to their double variants lose precision. Emit a warning whenever something
@ -58,10 +53,7 @@ WARN_IMPRECISE(powl)
* that call the regular "double" function.
*/
int __fpclassifyl(long double a1) { return __fpclassifyd(a1); }
int __isfinitel(long double a1) { return __isfinite(a1); }
int __isinfl(long double a1) { return __isinf(a1); }
int __isnanl(long double a1) { return (isnan)(a1); }
int __isnormall(long double a1) { return __isnormal(a1); }
int __signbitl(long double a1) { return __signbit(a1); }

94
libm/fpclassify.c
View File

@ -1,94 +0,0 @@
/*-
* Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
* Copyright (c) 2002, 2003 David Schultz <das@FreeBSD.ORG>
* 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: src/lib/libc/gen/fpclassify.c,v 1.2 2005/02/06 03:23:31 das Exp $
*/
#include <sys/endian.h>
#include <math.h>
#include <stdint.h>
#include "fpmath.h"
int
__fpclassifyf(float f)
{
union IEEEf2bits u;
u.f = f;
if (u.bits.exp == 0) {
if (u.bits.man == 0)
return (FP_ZERO);
return (FP_SUBNORMAL);
}
if (u.bits.exp == 255) {
if (u.bits.man == 0)
return (FP_INFINITE);
return (FP_NAN);
}
return (FP_NORMAL);
}
int
__fpclassifyd(double d)
{
union IEEEd2bits u;
u.d = d;
if (u.bits.exp == 0) {
if ((u.bits.manl | u.bits.manh) == 0)
return (FP_ZERO);
return (FP_SUBNORMAL);
}
if (u.bits.exp == 2047) {
if ((u.bits.manl | u.bits.manh) == 0)
return (FP_INFINITE);
return (FP_NAN);
}
return (FP_NORMAL);
}
int
__fpclassifyl(long double e)
{
union IEEEl2bits u;
u.e = e;
if (u.bits.exp == 0) {
if ((u.bits.manl | u.bits.manh) == 0)
return (FP_ZERO);
return (FP_SUBNORMAL);
}
mask_nbit_l(u); /* Mask normalization bit if applicable. */
if (u.bits.exp == 32767) {
if ((u.bits.manl | u.bits.manh) == 0)
return (FP_INFINITE);
return (FP_NAN);
}
return (FP_NORMAL);
}

68
libm/isinf.c
View File

@ -1,68 +0,0 @@
/*-
* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
* 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 <math.h>
#include <sys/cdefs.h>
#include "fpmath.h"
/*
* XXX These routines belong in libm, but they must remain in libc for
* binary compat until we can bump libm's major version number.
*/
int
__isinf(double d)
{
union IEEEd2bits u;
u.d = d;
return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
}
int
__isinff(float f)
{
union IEEEf2bits u;
u.f = f;
return (u.bits.exp == 255 && u.bits.man == 0);
}
int
__isinfl(long double e)
{
union IEEEl2bits u;
u.e = e;
mask_nbit_l(u);
#ifndef __alpha__
return (u.bits.exp == 32767 && u.bits.manl == 0 && u.bits.manh == 0);
#else
return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
#endif
}

65
libm/upstream-freebsd/lib/msun/src/s_isnan.c
View File

@ -1,65 +0,0 @@
/*-
* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
* 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 <math.h>
#include "fpmath.h"
/* Provided by libc.so */
#ifndef PIC
#undef isnan
int
isnan(double d)
{
union IEEEd2bits u;
u.d = d;
return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0));
}
#endif /* !PIC */
int
__isnanf(float f)
{
union IEEEf2bits u;
u.f = f;
return (u.bits.exp == 255 && u.bits.man != 0);
}
int
__isnanl(long double e)
{
union IEEEl2bits u;
u.e = e;
mask_nbit_l(u);
return (u.bits.exp == 32767 && (u.bits.manl != 0 || u.bits.manh != 0));
}
__weak_reference(__isnanf, isnanf);

12
tests/math_test.cpp
View File

@ -239,6 +239,12 @@ TEST(math, finite) {
ASSERT_FALSE(finite(HUGE_VAL));
}
TEST(math, isinf_function) {
// The isinf macro deals with all three types; the isinf function is for doubles.
ASSERT_FALSE((isinf)(123.0));
ASSERT_TRUE((isinf)(HUGE_VAL));
}
TEST(math, __isinff) {
ASSERT_FALSE(__isinff(123.0f));
ASSERT_TRUE(__isinff(HUGE_VALF));
@ -249,6 +255,12 @@ TEST(math, __isinfl) {
ASSERT_TRUE(__isinfl(HUGE_VALL));
}
TEST(math, isnan_function) {
// The isnan macro deals with all three types; the isnan function is for doubles.
ASSERT_FALSE((isnan)(123.0));
ASSERT_TRUE((isnan)(nan("")));
}
TEST(math, __isnanf) {
ASSERT_FALSE(__isnanf(123.0f));
ASSERT_TRUE(__isnanf(nanf("")));