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Try to get carry/zero/N flags set properly for various branch states

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This commit is contained in:
Jason Turner
2021-05-11 22:00:33 -06:00
parent 6c0e5a660d
commit 905e850abb
2 changed files with 13 additions and 6 deletions
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4
include/optimizer.hpp
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@@ -23,8 +23,8 @@ bool optimize(std::vector<mos6502> &instructions)
// remove unused flag-fix-up blocks
// 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) {
if (instructions[op - 1].text == "; END remove if next is lda") {
if (instructions[op].opcode == mos6502::OpCode::lda || instructions[op].opcode == mos6502::OpCode::bcc || instructions[op].opcode == mos6502::OpCode::bcs) {
if (instructions[op - 1].text == "; END remove if next is lda, bcc, bcs") {
for (size_t inner_op = op - 1; inner_op > 1; --inner_op) {
instructions[inner_op] = mos6502(ASMLine::Type::Directive,
"; removed unused flag fix-up: " + instructions[inner_op].to_string());