1//===-- NVPTXAtomicLower.cpp - Lower atomics of local memory ----*- 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// Lower atomics of local memory to simple load/stores
10//
11//===----------------------------------------------------------------------===//
12
13#include "NVPTX.h"
14#include "llvm/CodeGen/StackProtector.h"
15#include "llvm/IR/Function.h"
16#include "llvm/IR/InstIterator.h"
17#include "llvm/IR/Instructions.h"
18#include "llvm/Transforms/Utils/LowerAtomic.h"
19
20#include "MCTargetDesc/NVPTXBaseInfo.h"
21using namespace llvm;
22
23static bool lowerLocalMemoryAtomics(Function &F) {
24 SmallVector<AtomicRMWInst *> LocalMemoryAtomics;
25 for (Instruction &I : instructions(F))
26 if (AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(Val: &I))
27 if (RMWI->getPointerAddressSpace() == ADDRESS_SPACE_LOCAL)
28 LocalMemoryAtomics.push_back(Elt: RMWI);
29
30 bool Changed = false;
31 for (AtomicRMWInst *RMWI : LocalMemoryAtomics)
32 Changed |= lowerAtomicRMWInst(RMWI);
33 return Changed;
34}
35
36namespace {
37class NVPTXAtomicLowerLegacyPass : public FunctionPass {
38public:
39 static char ID; // Pass ID
40 NVPTXAtomicLowerLegacyPass() : FunctionPass(ID) {}
41
42 void getAnalysisUsage(AnalysisUsage &AU) const override {
43 AU.setPreservesCFG();
44 }
45
46 StringRef getPassName() const override {
47 return "NVPTX lower atomics of local memory";
48 }
49
50 bool runOnFunction(Function &F) override {
51 return lowerLocalMemoryAtomics(F);
52 }
53};
54} // namespace
55
56char NVPTXAtomicLowerLegacyPass::ID = 0;
57
58INITIALIZE_PASS(NVPTXAtomicLowerLegacyPass, "nvptx-atomic-lower",
59 "Lower atomics of local memory to simple load/stores", false,
60 false)
61
62FunctionPass *llvm::createNVPTXAtomicLowerLegacyPass() {
63 return new NVPTXAtomicLowerLegacyPass();
64}
65
66PreservedAnalyses NVPTXAtomicLowerPass::run(Function &F,
67 FunctionAnalysisManager &FAM) {
68 if (!lowerLocalMemoryAtomics(F))
69 return PreservedAnalyses::all();
70 return PreservedAnalyses::none().preserveSet<CFGAnalyses>();
71}
72