02c78a3867
Also move isinf and isnan into libc like everyone else. Also move fpclassify to libc like the BSDs (but unlike glibc). We need this to be able to upgrade our float/double/long double parsing to gdtoa. Also add some missing aliases. We now have all of: isnan, __isnan, isnanf, __isnanf, isnanl, __isnanl, isinf, __isinf, isinff, __isinff, isinfl, __isinfl, __fpclassify, __fpclassifyd, __fpclassifyf, __fpclassifyl. Bug: 13469877 Change-Id: I407ffbac06c765a6c5fffda8106c37d7db04f27d
138 lines
3.6 KiB
C++
138 lines
3.6 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <math.h>
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#include <machine/ieee.h>
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// These aren't declared in our <math.h>.
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extern "C" int __isinf(double);
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extern "C" int __isnan(double);
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union float_u {
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float f;
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ieee_single bits;
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};
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union double_u {
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double d;
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ieee_double bits;
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};
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int __fpclassifyd(double d) {
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double_u u;
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u.d = d;
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if (u.bits.dbl_exp == 0) {
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return ((u.bits.dbl_fracl | u.bits.dbl_frach) == 0) ? FP_ZERO : FP_SUBNORMAL;
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}
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if (u.bits.dbl_exp == DBL_EXP_INFNAN) {
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return ((u.bits.dbl_fracl | u.bits.dbl_frach) == 0) ? FP_INFINITE : FP_NAN;
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}
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return FP_NORMAL;
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}
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__strong_alias(__fpclassify, __fpclassifyd); // glibc uses __fpclassify, BSD __fpclassifyd.
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int __fpclassifyf(float f) {
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float_u u;
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u.f = f;
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if (u.bits.sng_exp == 0) {
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return (u.bits.sng_frac == 0) ? FP_ZERO : FP_SUBNORMAL;
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}
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if (u.bits.sng_exp == SNG_EXP_INFNAN) {
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return (u.bits.sng_frac == 0) ? FP_INFINITE : FP_NAN;
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}
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return FP_NORMAL;
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}
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int __isinf(double d) {
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return (__fpclassifyd(d) == FP_INFINITE);
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}
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__strong_alias(isinf, __isinf);
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int __isinff(float f) {
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return (__fpclassifyf(f) == FP_INFINITE);
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}
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__strong_alias(isinff, __isinff);
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int __isnan(double d) {
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return (__fpclassifyd(d) == FP_NAN);
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}
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__strong_alias(isnan, __isnan);
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int __isnanf(float f) {
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return (__fpclassifyf(f) == FP_NAN);
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}
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__strong_alias(isnanf, __isnanf);
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#if __LP64__
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// LP64 uses 128-bit long doubles.
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union long_double_u {
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long double ld;
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struct {
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unsigned long fracl:64;
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unsigned long frach:48;
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unsigned int exp:15;
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unsigned int sign:1;
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} bits;
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};
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int __fpclassifyl(long double ld) {
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long_double_u u;
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u.ld = ld;
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if (u.bits.exp == 0) {
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return ((u.bits.fracl | u.bits.frach) == 0) ? FP_ZERO : FP_SUBNORMAL;
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}
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if (u.bits.exp == EXT_EXP_INFNAN) {
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return ((u.bits.fracl | u.bits.frach) == 0) ? FP_INFINITE : FP_NAN;
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}
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return FP_NORMAL;
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}
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int __isinfl(long double ld) {
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return (__fpclassifyl(ld) == FP_INFINITE);
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}
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int __isnanl(long double ld) {
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return (__fpclassifyl(ld) == FP_NAN);
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}
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#else
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// LP32 uses double as long double.
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__strong_alias(__fpclassifyl, __fpclassify);
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__strong_alias(__isinfl, __isinf);
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__strong_alias(__isnanl, __isnan);
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#endif
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__strong_alias(isinfl, __isinfl);
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__strong_alias(isnanl, __isnanl);
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