blob: c0879b8b252dea2360577b6ed2517889f09521b9 (
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
39
40
|
//===-- ashrdi3.c - Implement __ashrdi3 -----------------------------------===//
//
// 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 __ashrdi3 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
// Returns: arithmetic a >> b
// Precondition: 0 <= b < bits_in_dword
COMPILER_RT_ABI di_int __ashrdi3(di_int a, int b) {
const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT);
dwords input;
dwords result;
input.all = a;
if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ {
// result.s.high = input.s.high < 0 ? -1 : 0
result.s.high = input.s.high >> (bits_in_word - 1);
result.s.low = input.s.high >> (b - bits_in_word);
} else /* 0 <= b < bits_in_word */ {
if (b == 0)
return a;
result.s.high = input.s.high >> b;
result.s.low =
((su_int)input.s.high << (bits_in_word - b)) | (input.s.low >> b);
}
return result.all;
}
#if defined(__ARM_EABI__)
COMPILER_RT_ALIAS(__ashrdi3, __aeabi_lasr)
#endif
|
