FatalErrorCoded/invadeez
1
0
Fork 0
forked from Lea/invadeez
Code Issues Pull requests Packages Projects Releases Wiki Activity

compare instructions

Browse source
This commit is contained in:
Martin Löffler 2023-01-26 04:16:02 +01:00
parent c61c814e55
commit cb26b0ff77
Signed by: FatalErrorCoded
GPG key ID: FFEF368AC076566A
2 changed files with 12 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
src/emulator/instructions/arithmetic.rs
View file

@ -57,6 +57,16 @@ bitwise_op!(and, and_reg, &);
bitwise_op!(or, or_reg, |);
bitwise_op!(xor, xor_reg, ^);
pub fn cmp_reg(register: Register, state: &mut EmulatorState) {
cmp(get_register(register, state), state);
}
pub fn cmp(byte: u8, state: &mut EmulatorState) {
let (result, carry) = state.a.overflowing_sub(byte);
state.cc.c = carry;
set_cc(state, result);
}
/// Double precision add - Add B&C, D&E or H&L to H&L
pub fn dad(register: Register, state: &mut EmulatorState) {
let num = get_register_pair(register, state);

2
src/emulator/main.rs
View file

@ -124,9 +124,11 @@ fn tick(state: &mut EmulatorState) {
0xa0..=0xa7 => arithmetic::and_reg(register_from_num(instruction & 0xf), state), // ANA
0xa8..=0xaf => arithmetic::xor_reg(register_from_num(instruction & 0xf), state), // XRA
0xb0..=0xb7 => arithmetic::or_reg(register_from_num(instruction & 0xf), state), // ORA
0xb8..=0xbf => arithmetic::cmp_reg(register_from_num(instruction & 0xf), state), // CMP
0xe6 => arithmetic::and(next_byte(), state), // ANI
0xee => arithmetic::xor(next_byte(), state), // XRI
0xf6 => arithmetic::or(next_byte(), state), // ORI
0xfe => arithmetic::cmp(next_byte(), state), // CPI
_ => not_implemented(state),
}