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eventually c++ does not provide any optimized pow(int,int) function,

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so here you go :) (should also fix Timothy's troubles)
This commit is contained in:
Gael Guennebaud 2009-02-18 18:24:31 +00:00
parent 747d83a05a
commit 752d95c20e
1 changed files with 14 additions and 6 deletions
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20
Eigen/src/Core/MathFunctions.h
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@ -60,12 +60,20 @@ inline int ei_exp(int) { ei_assert(false); return 0; }
inline int ei_log(int) { ei_assert(false); return 0; }
inline int ei_sin(int) { ei_assert(false); return 0; }
inline int ei_cos(int) { ei_assert(false); return 0; }
#if EIGEN_GNUC_AT_LEAST(4,3)
inline int ei_pow(int x, int y) { return int(std::pow(x, y)); }
#else
inline int ei_pow(int x, int y) { return int(std::pow(double(x), y)); }
#endif
inline int ei_pow(int x, int y)
{
int res = 1;
if(y < 0) return 0;
if(y & 1) res *= x;
y >>= 1;
while(y)
{
x *= x;
if(y&1) res *= x;
y >>= 1;
}
return res;
}
template<> inline int ei_random(int a, int b)
{