forked from OSchip/llvm-project
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
//===-- AllocaHoisting.cpp - Hoist allocas to the entry block --*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Hoist the alloca instructions in the non-entry blocks to the entry blocks.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "NVPTXAllocaHoisting.h"
|
|
#include "llvm/CodeGen/StackProtector.h"
|
|
#include "llvm/IR/Constants.h"
|
|
#include "llvm/IR/Function.h"
|
|
#include "llvm/IR/Instructions.h"
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
// Hoisting the alloca instructions in the non-entry blocks to the entry
|
|
// block.
|
|
class NVPTXAllocaHoisting : public FunctionPass {
|
|
public:
|
|
static char ID; // Pass ID
|
|
NVPTXAllocaHoisting() : FunctionPass(ID) {}
|
|
|
|
void getAnalysisUsage(AnalysisUsage &AU) const override {
|
|
AU.addPreserved<StackProtector>();
|
|
}
|
|
|
|
StringRef getPassName() const override {
|
|
return "NVPTX specific alloca hoisting";
|
|
}
|
|
|
|
bool runOnFunction(Function &function) override;
|
|
};
|
|
} // namespace
|
|
|
|
bool NVPTXAllocaHoisting::runOnFunction(Function &function) {
|
|
bool functionModified = false;
|
|
Function::iterator I = function.begin();
|
|
TerminatorInst *firstTerminatorInst = (I++)->getTerminator();
|
|
|
|
for (Function::iterator E = function.end(); I != E; ++I) {
|
|
for (BasicBlock::iterator BI = I->begin(), BE = I->end(); BI != BE;) {
|
|
AllocaInst *allocaInst = dyn_cast<AllocaInst>(BI++);
|
|
if (allocaInst && isa<ConstantInt>(allocaInst->getArraySize())) {
|
|
allocaInst->moveBefore(firstTerminatorInst);
|
|
functionModified = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return functionModified;
|
|
}
|
|
|
|
char NVPTXAllocaHoisting::ID = 0;
|
|
|
|
namespace llvm {
|
|
void initializeNVPTXAllocaHoistingPass(PassRegistry &);
|
|
}
|
|
|
|
INITIALIZE_PASS(
|
|
NVPTXAllocaHoisting, "alloca-hoisting",
|
|
"Hoisting alloca instructions in non-entry blocks to the entry block",
|
|
false, false)
|
|
|
|
FunctionPass *llvm::createAllocaHoisting() { return new NVPTXAllocaHoisting; }
|