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ROL and ROR instructions

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FranLMSP
2022-11-30 21:07:41 -05:00
parent 4d190e9523
commit 891dadc9b6
3 changed files with 127 additions and 0 deletions
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snes-core/src/utils/alu.rs
+40
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@@ -134,6 +134,24 @@ pub fn ora<T: SnesNum>(target: T, value: T) -> (T, [Flags; 2]) {
])
}
pub fn rol<T: SnesNum>(target: T, carry: bool) -> (T, [Flags; 3]) {
let result = target.rol(carry);
(result, [
Negative(result.is_negative()),
Zero(result.is_zero()),
Carry(target.is_negative()),
])
}
pub fn ror<T: SnesNum>(target: T, carry: bool) -> (T, [Flags; 3]) {
let result = target.ror(carry);
(result, [
Negative(result.is_negative()),
Zero(result.is_zero()),
Carry(target.lowest_bit()),
])
}
#[cfg(test)]
mod alu_tests {
@@ -400,4 +418,26 @@ mod alu_tests {
assert_eq!(result, 0);
assert_eq!(affected_flags, [Negative(false), Zero(true)]);
}
#[test]
fn test_rol() {
let (result, affected_flags) = rol(0b1000_0000_u8, false);
assert_eq!(result, 0);
assert_eq!(affected_flags, [Negative(false), Zero(true), Carry(true)]);
let (result, affected_flags) = rol(0b0100_0000_u8, true);
assert_eq!(result, 0b10000001);
assert_eq!(affected_flags, [Negative(true), Zero(false), Carry(false)]);
}
#[test]
fn test_ror() {
let (result, affected_flags) = ror(0b0000_0001_u8, false);
assert_eq!(result, 0);
assert_eq!(affected_flags, [Negative(false), Zero(true), Carry(true)]);
let (result, affected_flags) = ror(0b0000_0000_u8, true);
assert_eq!(result, 0b10000000);
assert_eq!(affected_flags, [Negative(true), Zero(false), Carry(false)]);
}
}