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/*
* 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);
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