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Minor optimizer fixes

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This commit is contained in:
Jason Turner
2021-06-02 21:12:28 -06:00
parent f52296a00f
commit 2536c4e2c7
3 changed files with 295 additions and 96 deletions
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include/optimizer.hpp
+6 -4
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@@ -121,7 +121,7 @@ bool optimize_dead_sta(std::span<mos6502> &block, const Personality &personality
for (auto itr = block.begin(); itr != block.end(); ++itr) {
if (itr->opcode == mos6502::OpCode::sta && is_virtual_register_op(*itr, personality)) {
for (auto inner = std::next(itr); inner != block.end(); ++inner) {
if (inner->op.value.find('(') != std::string::npos) {
if (not inner->op.value.starts_with("#<(") && inner->op.value.find('(') != std::string::npos) {
// this is an indexed operation, which is risky to optimize a sta around on the virtual registers,
// so we'll skip this block
break;
@@ -260,9 +260,11 @@ bool optimize(std::vector<mos6502> &instructions, [[maybe_unused]] const Persona
// it might make sense in the future to only insert these if determined they are needed?
for (size_t op = 10; op < instructions.size(); ++op) {
if (instructions[op].opcode == mos6502::OpCode::lda || instructions[op].opcode == mos6502::OpCode::bcc
|| instructions[op].opcode == mos6502::OpCode::bcs || instructions[op].opcode == mos6502::OpCode::ldy) {
if (instructions[op - 1].text == "; END remove if next is lda, bcc, bcs, ldy"
|| (instructions[op - 2].text == "; END remove if next is lda, bcc, bcs, ldy"
|| instructions[op].opcode == mos6502::OpCode::bcs || instructions[op].opcode == mos6502::OpCode::ldy
|| instructions[op].opcode == mos6502::OpCode::inc || instructions[op].opcode == mos6502::OpCode::clc
|| instructions[op].opcode == mos6502::OpCode::sec) {
if (instructions[op - 1].text == "; END remove if next is lda, bcc, bcs, ldy, inc, clc, sec"
|| (instructions[op - 2].text == "; END remove if next is lda, bcc, bcs, ldy, inc, clc, sec"
&& instructions[op - 1].type == ASMLine::Type::Directive)) {
for (size_t inner_op = op - 1; inner_op > 1; --inner_op) {
instructions[inner_op] =