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re PR libstdc++/11706 (std::pow(T, int) implementation pessimizes code)

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2005-02-13  Richard Guenther  <rguenth@gcc.gnu.org>
	    Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/11706
	* include/c_std/std_cmath.h (pow): Use __builtin_powi[lf]
	for integer overloads.

	* testsuite/26_numerics/cmath/powi.cc: New.

Co-Authored-By: Paolo Carlini <pcarlini@suse.de>

From-SVN: r94982
This commit is contained in:
Richard Guenther 2005-02-13 10:25:02 +00:00 committed by Paolo Carlini
parent b8b3c655b0
commit ae63a1cc46
3 changed files with 76 additions and 3 deletions
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9
libstdc++-v3/ChangeLog
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@ -1,3 +1,12 @@
2005-02-13 Richard Guenther <rguenth@gcc.gnu.org>
Paolo Carlini <pcarlini@suse.de>
PR libstdc++/11706
* include/c_std/std_cmath.h (pow): Use __builtin_powi[lf]
for integer overloads.
* testsuite/26_numerics/cmath/powi.cc: New.
2005-02-11 Janis Johnson <janis187@us.ibm.com>
* testsuite/26_numerics/complex/13450.cc: Fix XFAIL selector.

6
libstdc++-v3/include/c_std/std_cmath.h
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@ -350,15 +350,15 @@ namespace std
inline double
pow(double __x, int __i)
{ return __pow_helper(__x, __i); }
{ return __builtin_powi(__x, __i); }
inline float
pow(float __x, int __n)
{ return __pow_helper(__x, __n); }
{ return __builtin_powif(__x, __n); }
inline long double
pow(long double __x, int __n)
{ return __pow_helper(__x, __n); }
{ return __builtin_powil(__x, __n); }
using ::sin;

64
libstdc++-v3/testsuite/26_numerics/cmath/powi.cc Normal file
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@ -0,0 +1,64 @@
// 2005-02-13 Paolo Carlini <pcarlini@suse.de>
// Copyright (C) 2005 Free Software Foundation
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// 26.5 C Library
#include <cmath>
#include <testsuite_hooks.h>
template<typename T>
void test01_do()
{
using namespace std;
bool test __attribute__((unused)) = true;
VERIFY( pow(T(1.0), 0) == T(1.0) );
VERIFY( pow(T(2.0), 0) == T(1.0) );
VERIFY( pow(T(-1.0), 0) == T(1.0) );
VERIFY( pow(T(-4.0), 0) == T(1.0) );
VERIFY( pow(T(1.0), 1) == T(1.0) );
VERIFY( pow(T(2.0), 1) == T(2.0) );
VERIFY( pow(T(-1.0), 1) == T(-1.0) );
VERIFY( pow(T(-4.0), 1) == T(-4.0) );
VERIFY( pow(T(1.0), -1) == T(1.0) / T(1.0) );
VERIFY( pow(T(2.0), -1) == T(1.0) / T(2.0) );
VERIFY( pow(T(-1.0), -1) == T(1.0) / T(-1.0) );
VERIFY( pow(T(-4.0), -1) == T(1.0) / T(-4.0) );
VERIFY( pow(T(1.0), 2) == T(1.0) * T(1.0) );
VERIFY( pow(T(2.0), 2) == T(2.0) * T(2.0) );
VERIFY( pow(T(-1.0), 2) == T(-1.0) * T(-1.0) );
VERIFY( pow(T(-4.0), 2) == T(-4.0) * T(-4.0) );
}
void test01()
{
test01_do<float>();
test01_do<double>();
test01_do<long double>();
}
int main()
{
test01();
return 0;
}