CompileThreeMaggot/nudt-compiler-cpp
3
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

lower integer add-sub with immediates

Browse Source
This commit is contained in:
CGH0S7
2026-06-30 00:48:57 +08:00
parent c4e4513a9d
commit 3ef7bc28d6
1 changed files with 28 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
src/mir/Lowering.cpp
View File

@@ -368,6 +368,34 @@ void LowerInstruction(const ir::Instruction& inst, MachineFunction& function,
int dst_slot = function.CreateFrameIndex(4); int dst_slot = function.CreateFrameIndex(4);
slots.emplace(&inst, dst_slot); slots.emplace(&inst, dst_slot);
if (inst.GetOpcode() == ir::Opcode::Add) {
const ir::Value* variable = nullptr;
int constant = 0;
if (auto* lhs_const = dynamic_cast<const ir::ConstantInt*>(bin.GetLhs())) {
variable = bin.GetRhs();
constant = lhs_const->GetValue();
} else if (auto* rhs_const = dynamic_cast<const ir::ConstantInt*>(bin.GetRhs())) {
variable = bin.GetLhs();
constant = rhs_const->GetValue();
}
if (variable && constant >= -4095 && constant <= 4095) {
EmitValueToReg(variable, PhysReg::W8, slots, block);
block.Append(Opcode::AddRegImm, {Operand::Reg(PhysReg::W8), Operand::Reg(PhysReg::W8), Operand::Imm(constant)});
block.Append(Opcode::StoreStack, {Operand::Reg(PhysReg::W8), Operand::FrameIndex(dst_slot)});
return;
}
} else if (inst.GetOpcode() == ir::Opcode::Sub) {
if (auto* rhs_const = dynamic_cast<const ir::ConstantInt*>(bin.GetRhs())) {
int constant = rhs_const->GetValue();
if (constant >= -4095 && constant <= 4095) {
EmitValueToReg(bin.GetLhs(), PhysReg::W8, slots, block);
block.Append(Opcode::AddRegImm, {Operand::Reg(PhysReg::W8), Operand::Reg(PhysReg::W8), Operand::Imm(-constant)});
block.Append(Opcode::StoreStack, {Operand::Reg(PhysReg::W8), Operand::FrameIndex(dst_slot)});
return;
}
}
}
if (inst.GetOpcode() == ir::Opcode::Mul) { if (inst.GetOpcode() == ir::Opcode::Mul) {
const ir::Value* variable = nullptr; const ir::Value* variable = nullptr;
int constant = 0; int constant = 0;