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FranLMSP
2022-11-20 20:55:23 -05:00
parent 49bb3a04cc
commit f78883257a
3 changed files with 98 additions and 0 deletions
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snes-core/src/utils/alu.rs
+30
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@@ -151,6 +151,20 @@ pub fn sbc16bcd(target: u16, value: u16, carry: bool) -> (u16, bool, bool, bool)
(result, is_carry, is_negative, is_zero)
}
pub fn and8bit(target: u8, value: u8) -> (u8, bool, bool) {
let result = target & value;
let is_negative = (result >> 7) == 1;
let is_zero = result == 0;
(result, is_negative, is_zero)
}
pub fn and16bit(target: u16, value: u16) -> (u16, bool, bool) {
let result = target & value;
let is_negative = (result >> 15) == 1;
let is_zero = result == 0;
(result, is_negative, is_zero)
}
#[cfg(test)]
mod alu_tests {
use super::*;
@@ -376,4 +390,20 @@ mod alu_tests {
assert_eq!(negative, true);
assert_eq!(zero, false);
}
#[test]
fn test_and8bit() {
let (result, is_negative, is_zero) = and8bit(0b0101_0101, 0b0101_0101);
assert_eq!(result, 0b0101_0101);
assert_eq!(is_negative, false);
assert_eq!(is_zero, false);
}
#[test]
fn test_and16bit() {
let (result, is_negative, is_zero) = and16bit(0b01010101_01010101, 0b01010101_01010101);
assert_eq!(result, 0b01010101_01010101);
assert_eq!(is_negative, false);
assert_eq!(is_zero, false);
}
}