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修复支配树生成算法

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This commit is contained in:
rain2133
2025-06-25 12:42:28 +08:00
parent e6c4e91956
commit 3dc7c274cf
1 changed files with 18 additions and 7 deletions
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25
src/SysYIRAnalyser.cpp
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@ -1,4 +1,5 @@
#include "SysYIRAnalyser.h"
#include <iostream>
namespace sysy {
@ -47,8 +48,14 @@ auto ControlFlowAnalysis::findCommonDominator(BasicBlock *a, BasicBlock *b) -> B
BlockAnalysisInfo* infoB = blockAnalysisInfo[b];
// 如果深度不同，则向上移动到直接支配结点
// TODO：空间换时间倍增优化，优先级较低
while (infoA->getDomDepth() > infoB->getDomDepth()) a = const_cast<BasicBlock*>(infoA->getIdom());
while (infoB->getDomDepth() > infoA->getDomDepth()) b = const_cast<BasicBlock*>(infoB->getIdom());
while (infoA->getDomDepth() > infoB->getDomDepth()) {
a = const_cast<BasicBlock*>(infoA->getIdom());
infoA = blockAnalysisInfo[a];
}
while (infoB->getDomDepth() > infoA->getDomDepth()) {
b = const_cast<BasicBlock*>(infoB->getIdom());
infoB = blockAnalysisInfo[b];
}
if (a == b) break;
a = const_cast<BasicBlock*>(infoA->getIdom());
b = const_cast<BasicBlock*>(infoB->getIdom());
@ -137,11 +144,11 @@ void ControlFlowAnalysis::computeDomTree() {
for (auto pred : basicBlock->getPredecessors()) {
// 跳过未处理的前驱
if (blockAnalysisInfo[pred]->getIdom() == nullptr) continue;
new_idom = (new_idom == nullptr) ? pred : findCommonDominator(new_idom, pred);
// if (new_idom == nullptr)
// new_idom = pred;
// else
// new_idom = findCommonDominator(new_idom, pred);
// new_idom = (new_idom == nullptr) ? pred : findCommonDominator(new_idom, pred);
if (new_idom == nullptr)
new_idom = pred;
else
new_idom = findCommonDominator(new_idom, pred);
}
// 更新直接支配节点
if (new_idom && new_idom != blockAnalysisInfo[basicBlock.get()]->getIdom()) {
@ -150,6 +157,10 @@ void ControlFlowAnalysis::computeDomTree() {
blockAnalysisInfo[const_cast<BasicBlock*>(blockAnalysisInfo[basicBlock.get()]->getIdom())]->removeSdoms(basicBlock.get());
}
// 设置新的支配关系
// std::cout << "Block: " << basicBlock->getName()
// << " New Idom: " << new_idom->getName() << std::endl;
blockAnalysisInfo[basicBlock.get()]->setIdom(new_idom);
blockAnalysisInfo[new_idom]->addSdoms(basicBlock.get());
// 更新深度 = 直接支配节点深度 + 1