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eb66b33867
I did this a long time ago with a janky python script, but now clang-format has built-in support for this. I fed clang-format every line with a #include and let it re-sort things according to the precise LLVM rules for include ordering baked into clang-format these days. I've reverted a number of files where the results of sorting includes isn't healthy. Either places where we have legacy code relying on particular include ordering (where possible, I'll fix these separately) or where we have particular formatting around #include lines that I didn't want to disturb in this patch. This patch is *entirely* mechanical. If you get merge conflicts or anything, just ignore the changes in this patch and run clang-format over your #include lines in the files. Sorry for any noise here, but it is important to keep these things stable. I was seeing an increasing number of patches with irrelevant re-ordering of #include lines because clang-format was used. This patch at least isolates that churn, makes it easy to skip when resolving conflicts, and gets us to a clean baseline (again). llvm-svn: 304787
129 lines
4.2 KiB
C++
129 lines
4.2 KiB
C++
//===- Reg2Mem.cpp - Convert registers to allocas -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file demotes all registers to memory references. It is intended to be
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// the inverse of PromoteMemoryToRegister. By converting to loads, the only
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// values live across basic blocks are allocas and loads before phi nodes.
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// It is intended that this should make CFG hacking much easier.
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// To make later hacking easier, the entry block is split into two, such that
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// all introduced allocas and nothing else are in the entry block.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/Statistic.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/CFG.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Utils/Local.h"
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#include <list>
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using namespace llvm;
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#define DEBUG_TYPE "reg2mem"
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STATISTIC(NumRegsDemoted, "Number of registers demoted");
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STATISTIC(NumPhisDemoted, "Number of phi-nodes demoted");
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namespace {
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struct RegToMem : public FunctionPass {
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static char ID; // Pass identification, replacement for typeid
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RegToMem() : FunctionPass(ID) {
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initializeRegToMemPass(*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequiredID(BreakCriticalEdgesID);
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AU.addPreservedID(BreakCriticalEdgesID);
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}
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bool valueEscapes(const Instruction *Inst) const {
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const BasicBlock *BB = Inst->getParent();
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for (const User *U : Inst->users()) {
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const Instruction *UI = cast<Instruction>(U);
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if (UI->getParent() != BB || isa<PHINode>(UI))
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return true;
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}
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return false;
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}
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bool runOnFunction(Function &F) override;
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};
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}
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char RegToMem::ID = 0;
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INITIALIZE_PASS_BEGIN(RegToMem, "reg2mem", "Demote all values to stack slots",
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false, false)
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INITIALIZE_PASS_DEPENDENCY(BreakCriticalEdges)
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INITIALIZE_PASS_END(RegToMem, "reg2mem", "Demote all values to stack slots",
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false, false)
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bool RegToMem::runOnFunction(Function &F) {
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if (F.isDeclaration() || skipFunction(F))
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return false;
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// Insert all new allocas into entry block.
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BasicBlock *BBEntry = &F.getEntryBlock();
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assert(pred_empty(BBEntry) &&
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"Entry block to function must not have predecessors!");
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// Find first non-alloca instruction and create insertion point. This is
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// safe if block is well-formed: it always have terminator, otherwise
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// we'll get and assertion.
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BasicBlock::iterator I = BBEntry->begin();
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while (isa<AllocaInst>(I)) ++I;
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CastInst *AllocaInsertionPoint = new BitCastInst(
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Constant::getNullValue(Type::getInt32Ty(F.getContext())),
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Type::getInt32Ty(F.getContext()), "reg2mem alloca point", &*I);
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// Find the escaped instructions. But don't create stack slots for
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// allocas in entry block.
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std::list<Instruction*> WorkList;
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for (BasicBlock &ibb : F)
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for (BasicBlock::iterator iib = ibb.begin(), iie = ibb.end(); iib != iie;
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++iib) {
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if (!(isa<AllocaInst>(iib) && iib->getParent() == BBEntry) &&
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valueEscapes(&*iib)) {
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WorkList.push_front(&*iib);
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}
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}
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// Demote escaped instructions
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NumRegsDemoted += WorkList.size();
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for (Instruction *ilb : WorkList)
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DemoteRegToStack(*ilb, false, AllocaInsertionPoint);
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WorkList.clear();
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// Find all phi's
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for (BasicBlock &ibb : F)
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for (BasicBlock::iterator iib = ibb.begin(), iie = ibb.end(); iib != iie;
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++iib)
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if (isa<PHINode>(iib))
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WorkList.push_front(&*iib);
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// Demote phi nodes
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NumPhisDemoted += WorkList.size();
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for (Instruction *ilb : WorkList)
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DemotePHIToStack(cast<PHINode>(ilb), AllocaInsertionPoint);
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return true;
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}
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// createDemoteRegisterToMemory - Provide an entry point to create this pass.
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char &llvm::DemoteRegisterToMemoryID = RegToMem::ID;
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FunctionPass *llvm::createDemoteRegisterToMemoryPass() {
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return new RegToMem();
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}
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