AMDGPUAlwaysInlinePass.cpp revision de2d8694e25a814696358e95141f4b1aa4d8847e 
1//===-- AMDGPUAlwaysInlinePass.cpp - Promote Allocas ----------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10/// \file
11/// This pass marks all internal functions as always_inline and creates
12/// duplicates of all other functions a marks the duplicates as always_inline.
13//
14//===----------------------------------------------------------------------===//
15
16#include "AMDGPU.h"
17#include "llvm/IR/Module.h"
18#include "llvm/Transforms/Utils/Cloning.h"
19
20using namespace llvm;
21
22namespace {
23
24class AMDGPUAlwaysInline : public ModulePass {
25  static char ID;
26
27public:
28  AMDGPUAlwaysInline() : ModulePass(ID) { }
29  bool runOnModule(Module &M) override;
30  const char *getPassName() const override { return "AMDGPU Always Inline Pass"; }
31};
32
33} // End anonymous namespace
34
35char AMDGPUAlwaysInline::ID = 0;
36
37bool AMDGPUAlwaysInline::runOnModule(Module &M) {
38  std::vector<Function *> FuncsToClone;
39
40  for (Function &F : M) {
41    if (!F.hasLocalLinkage() && !F.isDeclaration() && !F.use_empty() &&
42        !F.hasFnAttribute(Attribute::NoInline))
43      FuncsToClone.push_back(&F);
44  }
45
46  for (Function *F : FuncsToClone) {
47    ValueToValueMapTy VMap;
48    Function *NewFunc = CloneFunction(F, VMap);
49    NewFunc->setLinkage(GlobalValue::InternalLinkage);
50    F->replaceAllUsesWith(NewFunc);
51  }
52
53  for (Function &F : M) {
54    if (F.hasLocalLinkage() && !F.hasFnAttribute(Attribute::NoInline)) {
55      F.addFnAttr(Attribute::AlwaysInline);
56    }
57  }
58  return false;
59}
60
61ModulePass *llvm::createAMDGPUAlwaysInlinePass() {
62  return new AMDGPUAlwaysInline();
63}
64