-
Notifications
You must be signed in to change notification settings - Fork 477
/
__ashldi3.c
41 lines (35 loc) · 1.02 KB
/
__ashldi3.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
/*
* Copyright 2014-2016 CyberVision, Inc.
*
* 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 <inttypes.h>
uint64_t __ashldi3(uint64_t a, int b)
{
if (b <= 0 ) {
return a;
}
if (b >= 64) {
return 0;
}
uint32_t aLow = (uint32_t) a;
uint32_t aHigh = (uint32_t) (a >> 32);
if (b >= 32) {
aHigh = (aLow << b);
aLow = 0;
} else {
aHigh = (aHigh << b) + (aLow >> (32 - b));
aLow = (aLow << b);
}
return ((uint64_t) aHigh << 32) + aLow;
}