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omit empty frames for leaf functions

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CGH0S7
2026-06-30 00:51:40 +08:00
parent 3ef7bc28d6
commit 012536acea
1 changed files with 15 additions and 0 deletions
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15
src/mir/FrameLowering.cpp
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@@ -33,6 +33,21 @@ void RunFrameLowering(MachineFunction& function) {
auto& blocks = function.GetBlocks(); auto& blocks = function.GetBlocks();
if (blocks.empty()) return; if (blocks.empty()) return;
bool has_call = false;
for (const auto& block : blocks) {
for (const auto& inst : block.GetInstructions()) {
if (inst.GetOpcode() == Opcode::Call) {
has_call = true;
break;
}
}
if (has_call) break;
}
if (function.GetFrameSize() == 0 && !has_call) {
return;
}
// Insert Prologue at the start of the first block // Insert Prologue at the start of the first block
auto& entry_insts = blocks.front().GetInstructions(); auto& entry_insts = blocks.front().GetInstructions();
entry_insts.insert(entry_insts.begin(), MachineInstr(Opcode::Prologue)); entry_insts.insert(entry_insts.begin(), MachineInstr(Opcode::Prologue));