mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-27 17:45:46 +08:00
32 lines
416 B
C
32 lines
416 B
C
#include "f2c.h"
|
|
|
|
longint
|
|
pow_qq (longint * ap, longint * bp)
|
|
{
|
|
longint pow, x, n;
|
|
unsigned long long u; /* system-dependent */
|
|
|
|
x = *ap;
|
|
n = *bp;
|
|
|
|
if (n <= 0)
|
|
{
|
|
if (n == 0 || x == 1)
|
|
return 1;
|
|
if (x != -1)
|
|
return x == 0 ? 1 / x : 0;
|
|
n = -n;
|
|
}
|
|
u = n;
|
|
for (pow = 1;;)
|
|
{
|
|
if (u & 01)
|
|
pow *= x;
|
|
if (u >>= 1)
|
|
x *= x;
|
|
else
|
|
break;
|
|
}
|
|
return (pow);
|
|
}
|