mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-10 02:36:06 +00:00
3e15bf33e0
Due to darwin gcc bug, one version of darwin linker coalesces static const int, which defauts PassID based pass identification. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36652 91177308-0d34-0410-b5e6-96231b3b80d8
94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
//===- Mem2Reg.cpp - The -mem2reg pass, a wrapper around the Utils lib ----===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This pass is a simple pass wrapper around the PromoteMemToReg function call
|
|
// exposed by the Utils library.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "mem2reg"
|
|
#include "llvm/Transforms/Scalar.h"
|
|
#include "llvm/Transforms/Utils/PromoteMemToReg.h"
|
|
#include "llvm/Transforms/Utils/UnifyFunctionExitNodes.h"
|
|
#include "llvm/Analysis/Dominators.h"
|
|
#include "llvm/Instructions.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/ADT/Statistic.h"
|
|
#include "llvm/Support/Compiler.h"
|
|
using namespace llvm;
|
|
|
|
STATISTIC(NumPromoted, "Number of alloca's promoted");
|
|
|
|
namespace {
|
|
struct VISIBILITY_HIDDEN PromotePass : public FunctionPass {
|
|
static const char ID; // Pass identifcation, replacement for typeid
|
|
PromotePass() : FunctionPass((intptr_t)&ID) {}
|
|
|
|
// runOnFunction - To run this pass, first we calculate the alloca
|
|
// instructions that are safe for promotion, then we promote each one.
|
|
//
|
|
virtual bool runOnFunction(Function &F);
|
|
|
|
// getAnalysisUsage - We need dominance frontiers
|
|
//
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.addRequired<ETForest>();
|
|
AU.addRequired<DominanceFrontier>();
|
|
AU.setPreservesCFG();
|
|
// This is a cluster of orthogonal Transforms
|
|
AU.addPreserved<UnifyFunctionExitNodes>();
|
|
AU.addPreservedID(LowerSelectID);
|
|
AU.addPreservedID(LowerSwitchID);
|
|
AU.addPreservedID(LowerInvokePassID);
|
|
AU.addPreservedID(LowerAllocationsID);
|
|
}
|
|
};
|
|
|
|
const char PromotePass::ID = 0;
|
|
RegisterPass<PromotePass> X("mem2reg", "Promote Memory to Register");
|
|
} // end of anonymous namespace
|
|
|
|
bool PromotePass::runOnFunction(Function &F) {
|
|
std::vector<AllocaInst*> Allocas;
|
|
|
|
BasicBlock &BB = F.getEntryBlock(); // Get the entry node for the function
|
|
|
|
bool Changed = false;
|
|
|
|
ETForest &ET = getAnalysis<ETForest>();
|
|
DominanceFrontier &DF = getAnalysis<DominanceFrontier>();
|
|
|
|
while (1) {
|
|
Allocas.clear();
|
|
|
|
// Find allocas that are safe to promote, by looking at all instructions in
|
|
// the entry node
|
|
for (BasicBlock::iterator I = BB.begin(), E = --BB.end(); I != E; ++I)
|
|
if (AllocaInst *AI = dyn_cast<AllocaInst>(I)) // Is it an alloca?
|
|
if (isAllocaPromotable(AI))
|
|
Allocas.push_back(AI);
|
|
|
|
if (Allocas.empty()) break;
|
|
|
|
PromoteMemToReg(Allocas, ET, DF);
|
|
NumPromoted += Allocas.size();
|
|
Changed = true;
|
|
}
|
|
|
|
return Changed;
|
|
}
|
|
|
|
// Publically exposed interface to pass...
|
|
const PassInfo *llvm::PromoteMemoryToRegisterID = X.getPassInfo();
|
|
// createPromoteMemoryToRegister - Provide an entry point to create this pass.
|
|
//
|
|
FunctionPass *llvm::createPromoteMemoryToRegisterPass() {
|
|
return new PromotePass();
|
|
}
|