blob: d00a22095993954a4233afef347916912e0595b8 (
plain) (
blame)
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
|
//===-- lshrti3.c - Implement __lshrti3 -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements __lshrti3 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
#ifdef CRT_HAS_128BIT
// Returns: logical a >> b
// Precondition: 0 <= b < bits_in_tword
COMPILER_RT_ABI ti_int __lshrti3(ti_int a, si_int b) {
const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT);
utwords input;
utwords result;
input.all = a;
if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */ {
result.s.high = 0;
result.s.low = input.s.high >> (b - bits_in_dword);
} else /* 0 <= b < bits_in_dword */ {
if (b == 0)
return a;
result.s.high = input.s.high >> b;
result.s.low = (input.s.high << (bits_in_dword - b)) | (input.s.low >> b);
}
return result.all;
}
#endif // CRT_HAS_128BIT
|
