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[midend-SCCP]修改BaiscBlock的析构逻辑，将CFG修改的职责交给优化遍,注释Mem2Reg的调试信息。

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This commit is contained in:
rain2133
2025-08-01 01:44:33 +08:00
parent 0f1fcc835d
commit c268191826
3 changed files with 29 additions and 10 deletions
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12
src/midend/Pass/Optimize/SCCP.cpp
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@ -1,4 +1,6 @@
#include "SCCP.h"
#include "Dom.h"
#include "Liveness.h"
#include <algorithm>
#include <cassert>
#include <cmath> // For std::fmod, std::fabs
@ -236,6 +238,8 @@ SSAPValue SCCPContext::ComputeConstant(UnaryInst *unaryInst, SSAPValue operandVa
if (operandVal.constant_type == ValueType::Integer) {
int val = std::get<int>(operandVal.constantVal);
switch (unaryInst->getKind()) {
case Instruction::kAdd:
return SSAPValue(val);
case Instruction::kNeg:
return SSAPValue(-val);
case Instruction::kNot:
@ -246,6 +250,8 @@ SSAPValue SCCPContext::ComputeConstant(UnaryInst *unaryInst, SSAPValue operandVa
} else if (operandVal.constant_type == ValueType::Float) {
float val = std::get<float>(operandVal.constantVal);
switch (unaryInst->getKind()) {
case Instruction::kAdd:
return SSAPValue(val);
case Instruction::kFNeg:
return SSAPValue(-val);
case Instruction::kFNot:
@ -593,6 +599,7 @@ bool SCCPContext::PropagateConstants(Function *func) {
}
// 实际删除指令
// TODO: 删除的逻辑需要考虑修改
for (Instruction *inst : instsToDelete) {
// 在尝试删除之前，先检查指令是否仍然附加到其父基本块。
// 如果它已经没有父块，可能说明它已被其他方式处理或已处于无效状态。
@ -752,6 +759,7 @@ void SCCPContext::RemoveDeadBlock(BasicBlock *bb, Function *func) {
}
for (BasicBlock *succ : succs_to_update) {
RemovePhiIncoming(succ, bb);
succ->removePredecessor(bb);
}
func->removeBasicBlock(bb); // 从函数中移除基本块
@ -864,7 +872,9 @@ bool SCCP::runOnFunction(Function *F, AnalysisManager &AM) {
}
void SCCP::getAnalysisUsage(std::set<void *> &analysisDependencies, std::set<void *> &analysisInvalidations) const {
analysisInvalidations.insert(nullptr); // 表示使所有默认分析失效
// analysisInvalidations.insert(nullptr); // 表示使所有默认分析失效
analysisInvalidations.insert(&DominatorTreeAnalysisPass::ID); // 支配树可能受影响
analysisInvalidations.insert(&LivenessAnalysisPass::ID); // 活跃性分析很可能失效
}
} // namespace sysy