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Faster 16bit increment for index operations

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This commit is contained in:
Jason Turner
2021-05-21 12:02:48 -06:00
parent af0a07b913
commit a04c937aeb
1 changed files with 6 additions and 8 deletions
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14
src/6502-c++.cpp
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@@ -315,14 +315,12 @@ void subtract_16_bit(const Personality &personality,
void increment_16_bit(const Personality &personality, std::vector<mos6502> &instructions, int reg) void increment_16_bit(const Personality &personality, std::vector<mos6502> &instructions, int reg)
{ {
// instructions.emplace_back(mos6502::OpCode::sta, Operand(Operand::Type::literal, address_low_byte)); std::string skip_high_byte_label =
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg)); "skip_inc_high_byte_" + std::to_string(instructions.size());
instructions.emplace_back(mos6502::OpCode::clc); instructions.emplace_back(mos6502::OpCode::inc, personality.get_register(reg));
instructions.emplace_back(mos6502::OpCode::adc, Operand(Operand::Type::literal, "#1")); instructions.emplace_back(mos6502::OpCode::bne, Operand(Operand::Type::literal, skip_high_byte_label));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg)); instructions.emplace_back(mos6502::OpCode::inc, personality.get_register(reg+1));
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(reg + 1)); instructions.emplace_back(ASMLine::Type::Label, skip_high_byte_label);
instructions.emplace_back(mos6502::OpCode::adc, Operand(Operand::Type::literal, "#0"));
instructions.emplace_back(mos6502::OpCode::sta, personality.get_register(reg + 1));
} }
void translate_instruction(const Personality &personality, void translate_instruction(const Personality &personality,