/
kpowi.c
41 lines (38 loc) · 929 Bytes
/
kpowi.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
/*
* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "mthdecls.h"
long long
__mth_i_kpowi(long long x, int i)
{
int k;
long long f;
f = 1;
k = i;
if (k < 0)
k = -k;
for (;;) {
if (k & 1)
f *= x;
k = (unsigned)k >> 1;
if (k == 0)
break;
x *= x;
}
if (i < 0)
f = 1.0f / f;
return f;
}