LLVM
15.0.0git
lib
Support
Atomic.cpp
Go to the documentation of this file.
1
//===-- Atomic.cpp - Atomic Operations --------------------------*- C++ -*-===//
2
//
3
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4
// See https://llvm.org/LICENSE.txt for license information.
5
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6
//
7
//===----------------------------------------------------------------------===//
8
//
9
// This file implements atomic operations.
10
//
11
//===----------------------------------------------------------------------===//
12
13
#include "
llvm/Support/Atomic.h
"
14
#include "llvm/Config/llvm-config.h"
15
16
using namespace
llvm
;
17
18
#if defined(_MSC_VER)
19
#include <intrin.h>
20
21
// We must include windows.h after intrin.h.
22
#include <windows.h>
23
#undef MemoryFence
24
#endif
25
26
#if defined(__GNUC__) || (defined(__IBMCPP__) && __IBMCPP__ >= 1210)
27
#define GNU_ATOMICS
28
#endif
29
30
void
sys::MemoryFence
() {
31
#if LLVM_HAS_ATOMICS == 0
32
return
;
33
#else
34
# if defined(GNU_ATOMICS)
35
__sync_synchronize();
36
# elif defined(_MSC_VER)
37
MemoryBarrier();
38
# else
39
# error No memory fence implementation for your platform!
40
# endif
41
#endif
42
}
43
44
sys::cas_flag
sys::CompareAndSwap
(
volatile
sys::cas_flag
* ptr,
45
sys::cas_flag
new_value,
46
sys::cas_flag
old_value) {
47
#if LLVM_HAS_ATOMICS == 0
48
sys::cas_flag
result
= *ptr;
49
if
(
result
== old_value)
50
*ptr = new_value;
51
return
result
;
52
#elif defined(GNU_ATOMICS)
53
return
__sync_val_compare_and_swap(ptr, old_value, new_value);
54
#elif defined(_MSC_VER)
55
return
InterlockedCompareExchange(ptr, new_value, old_value);
56
#else
57
# error No compare-and-swap implementation for your platform!
58
#endif
59
}
llvm
This is an optimization pass for GlobalISel generic memory operations.
Definition:
AddressRanges.h:17
Atomic.h
llvm::sys::MemoryFence
void MemoryFence()
Definition:
Atomic.cpp:30
llvm::sys::CompareAndSwap
cas_flag CompareAndSwap(volatile cas_flag *ptr, cas_flag new_value, cas_flag old_value)
Definition:
Atomic.cpp:44
result
It looks like we only need to define PPCfmarto for these because according to these instructions perform RTO on fma s result
Definition:
README_P9.txt:256
uint32_t
Generated on Thu May 26 2022 04:14:22 for LLVM by
1.8.17