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alu: Fix carry detection for subtraction

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Former-commit-id: c9d8612f72ce4a002ea33446209bd7e6da0eb5aa
This commit is contained in:
Michel Heily 2019-07-09 00:30:23 +03:00
parent 1bacb927af
commit 2817db4e1c
1 changed files with 1 additions and 1 deletions
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src/arm7tdmi/alu.rs
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@ -201,7 +201,7 @@ impl Core {
fn alu_sub_flags(a: i32, b: i32, carry: &mut bool, overflow: &mut bool) -> i32 { fn alu_sub_flags(a: i32, b: i32, carry: &mut bool, overflow: &mut bool) -> i32 {
let res = a.wrapping_sub(b); let res = a.wrapping_sub(b);
*carry = res > a; *carry = b <= a;
let (_, would_overflow) = a.overflowing_sub(b); let (_, would_overflow) = a.overflowing_sub(b);
*overflow = would_overflow; *overflow = would_overflow;
res res