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[optimze]添加基础的除法指令优化，目前只对除以2的幂数生效

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CGH0S7
2025-08-03 13:46:42 +08:00
parent e8699d6d25
commit f312792fe9
10 changed files with 419 additions and 6 deletions
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11
src/backend/RISCv64/RISCv64ISel.cpp
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@ -539,6 +539,15 @@ void RISCv64ISel::selectNode(DAGNode* node) {
CurMBB->addInstruction(std::move(instr));
break;
}
case Instruction::kSRA: {
auto rhs_const = dynamic_cast<ConstantInteger*>(rhs);
auto instr = std::make_unique<MachineInstr>(RVOpcodes::SRAIW);
instr->addOperand(std::make_unique<RegOperand>(dest_vreg));
instr->addOperand(std::make_unique<RegOperand>(lhs_vreg));
instr->addOperand(std::make_unique<ImmOperand>(rhs_const->getInt()));
CurMBB->addInstruction(std::move(instr));
break;
}
case BinaryInst::kICmpEQ: { // 等于 (a == b) -> (subw; seqz)
auto sub = std::make_unique<MachineInstr>(RVOpcodes::SUBW);
sub->addOperand(std::make_unique<RegOperand>(dest_vreg));
@ -1473,7 +1482,7 @@ std::vector<std::unique_ptr<RISCv64ISel::DAGNode>> RISCv64ISel::build_dag(BasicB
}
}
}
if (bin->getKind() >= Instruction::kFAdd) { // 假设浮点指令枚举值更大
if (bin->isFPBinary()) { // 假设浮点指令枚举值更大
auto fbin_node = create_node(DAGNode::FBINARY, bin, value_to_node, nodes_storage);
fbin_node->operands.push_back(get_operand_node(bin->getLhs(), value_to_node, nodes_storage));
fbin_node->operands.push_back(get_operand_node(bin->getRhs(), value_to_node, nodes_storage));