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[backend]移除了冗余的keepalive伪指令

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This commit is contained in:
Lixuanwang
2025-08-04 14:11:27 +08:00
parent 208d5528b5
commit 64ba25a77e
1 changed files with 0 additions and 27 deletions
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27
src/backend/RISCv64/RISCv64ISel.cpp
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@ -167,33 +167,6 @@ void RISCv64ISel::selectBasicBlock(BasicBlock* bb) {
select_recursive(node_to_select);
}
}
if (CurMBB == MFunc->getBlocks().front().get()) { // 只对入口块操作
auto keepalive = std::make_unique<MachineInstr>(RVOpcodes::PSEUDO_KEEPALIVE);
for (Argument* arg : F->getArguments()) {
keepalive->addOperand(std::make_unique<RegOperand>(getVReg(arg)));
}
auto& instrs = CurMBB->getInstructions();
auto insert_pos = instrs.end();
// 关键：检查基本块是否以一个“终止指令”结尾
if (!instrs.empty()) {
RVOpcodes last_op = instrs.back()->getOpcode();
// 扩充了判断条件，涵盖所有可能的终止指令
if (last_op == RVOpcodes::J || last_op == RVOpcodes::RET ||
last_op == RVOpcodes::BEQ || last_op == RVOpcodes::BNE ||
last_op == RVOpcodes::BLT || last_op == RVOpcodes::BGE ||
last_op == RVOpcodes::BLTU || last_op == RVOpcodes::BGEU)
{
// 如果是，插入点就在这个终止指令之前
insert_pos = std::prev(instrs.end());
}
}
// 在计算出的正确位置插入伪指令
instrs.insert(insert_pos, std::move(keepalive));
}
}
// 核心函数：为DAG节点选择并生成MachineInstr (已修复和增强的完整版本)