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convert sec/sbc with cmp, increase perf

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This commit is contained in:
Jason Turner 2021-05-05 17:02:38 -06:00
parent ab9dd4e1b7
commit d39ad32438
1 changed files with 2 additions and 2 deletions
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4
src/main.cpp
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@ -1005,8 +1005,7 @@ void translate_instruction(std::vector<mos6502> &instructions, const AVR::OpCode
case AVR::OpCode::cpi: {
// note that this will leave the C flag in the 6502 borrow state, not normal carry state
instructions.emplace_back(mos6502::OpCode::lda, AVR::get_register(o1_reg_num));
instructions.emplace_back(mos6502::OpCode::sec);
instructions.emplace_back(mos6502::OpCode::sbc, Operand(o2.type, fixup_8bit_literal(o2.value)));
instructions.emplace_back(mos6502::OpCode::cmp, Operand(o2.type, fixup_8bit_literal(o2.value)));
return;
}
case AVR::OpCode::brlo: {
@ -1074,6 +1073,7 @@ void translate_instruction(std::vector<mos6502> &instructions, const AVR::OpCode
return;
} else {
instructions.emplace_back(mos6502::OpCode::bcs, o1);
return;
}
}