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[midend]将alloca声明统一到entry块，增加mem2reg的机会，TODO：不是很明白为什么开了优化过不了一些样例正在排查原因

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This commit is contained in:
rain2133
2025-08-03 13:45:13 +08:00
parent 32ea24df56
commit 3b1bafde9c
2 changed files with 29 additions and 2 deletions
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4
src/midend/Pass/Pass.cpp
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@@ -108,6 +108,10 @@ void PassManager::runOptimizationPipeline(Module* moduleIR, IRBuilder* builderIR
printPasses(); printPasses();
} }
this->clearPasses();
this->addPass(&DCE::ID);
this->run();
if (DEBUG) std::cout << "--- Custom optimization sequence finished ---\n"; if (DEBUG) std::cout << "--- Custom optimization sequence finished ---\n";
} }

27
src/midend/SysYIRGenerator.cpp
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@@ -586,7 +586,18 @@ std::any SysYIRGenerator::visitConstDecl(SysYParser::ConstDeclContext *ctx) {
// 显式地为局部常量在栈上分配空间 // 显式地为局部常量在栈上分配空间
// alloca 的类型将是指针指向常量类型，例如 `int*` 或 `int[2][3]*` // alloca 的类型将是指针指向常量类型，例如 `int*` 或 `int[2][3]*`
// 将 alloca 全部集中到entry函数中
// 记录当前位置
BasicBlock *curBB = builder.getBasicBlock();
auto curPos =builder.getPosition();
Function *currentFunction = builder.getBasicBlock()->getParent();
BasicBlock *entryBB = currentFunction->getEntryBlock();
// 在terminator前插入
auto entryPos = entryBB->terminator();
builder.setPosition(entryBB, entryPos);
AllocaInst *alloca = builder.createAllocaInst(Type::getPointerType(variableType), name); AllocaInst *alloca = builder.createAllocaInst(Type::getPointerType(variableType), name);
// 恢复当前位置
builder.setPosition(curBB, curPos);
ArrayValueTree *root = std::any_cast<ArrayValueTree *>(constDef->constInitVal()->accept(this)); ArrayValueTree *root = std::any_cast<ArrayValueTree *>(constDef->constInitVal()->accept(this));
ValueCounter values; ValueCounter values;
@@ -743,8 +754,20 @@ std::any SysYIRGenerator::visitVarDecl(SysYParser::VarDeclContext *ctx) {
// 对于数组，alloca 的类型将是指针指向数组类型，例如 `int[2][3]*` // 对于数组，alloca 的类型将是指针指向数组类型，例如 `int[2][3]*`
// 对于标量，alloca 的类型将是指针指向标量类型，例如 `int*` // 对于标量，alloca 的类型将是指针指向标量类型，例如 `int*`
AllocaInst* alloca =
builder.createAllocaInst(Type::getPointerType(variableType), name); BasicBlock *curBB = builder.getBasicBlock();
auto curPos =builder.getPosition();
Function *currentFunction = builder.getBasicBlock()->getParent();
BasicBlock *entryBB = currentFunction->getEntryBlock();
// 在terminator前插入
auto entryPos = entryBB->terminator();
builder.setPosition(entryBB, entryPos);
AllocaInst *alloca = builder.createAllocaInst(Type::getPointerType(variableType), name);
// 恢复当前位置
builder.setPosition(curBB, curPos);
// AllocaInst* alloca =
// builder.createAllocaInst(Type::getPointerType(variableType), name);
if (varDef->initVal() != nullptr) { if (varDef->initVal() != nullptr) {
ValueCounter values; ValueCounter values;