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6502-cpp
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Add AVR tst opcode

This commit is contained in:
Jason Turner 2021-05-23 13:53:52 -06:00
parent 5b6bfd138d
commit 5b764ad179
1 changed files with 10 additions and 0 deletions
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10
src/6502-c++.cpp
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@ -140,6 +140,8 @@ struct AVR : ASMLine
sub,
subi,
swap,
tst,
};
[[nodiscard]] static constexpr OpCode parse_opcode(Type t, std::string_view o)
@ -196,6 +198,7 @@ struct AVR : ASMLine
if (o == "inc") { return OpCode::inc; }
if (o == "nop") { return OpCode::nop; }
if (o == "jmp") { return OpCode::jmp; }
if (o == "tst") { return OpCode::tst; }
}
}
throw std::runtime_error(fmt::format("Unknown opcode: {}", o));
@ -347,7 +350,14 @@ void translate_instruction(const Personality &personality,
switch (op) {
case AVR::OpCode::jmp: instructions.emplace_back(mos6502::OpCode::jmp, o1); return;
case AVR::OpCode::tst: {
// just an lda will set the relevant flags that the tst operation sets, so I think this is
// sufficient
instructions.emplace_back(mos6502::OpCode::lda, personality.get_register(o1_reg_num));
return;
}
case AVR::OpCode::dec: instructions.emplace_back(mos6502::OpCode::dec, personality.get_register(o1_reg_num)); return;
case AVR::OpCode::ldi:
instructions.emplace_back(mos6502::OpCode::lda, Operand(o2.type, fixup_8bit_literal(o2.value)));