From 2bcbfa63b5968494fb54e2498915cbc598237744 Mon Sep 17 00:00:00 2001 From: Sam M W Date: Sun, 23 Oct 2022 07:01:26 +0100 Subject: [PATCH] fix panic --- src/cpu.rs | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/cpu.rs b/src/cpu.rs index 6e68b5a..e64aed1 100644 --- a/src/cpu.rs +++ b/src/cpu.rs @@ -629,7 +629,8 @@ impl CPU { let over = ((nc == 0 && value < 0) || (nc == 1 && value < -1)) && a_before >= 0 && a_after < 0; - let under = (a_before < 0) && (-value - nc < 0) && a_after >= 0; + let under = + (a_before < 0) && (0i8.wrapping_sub(value).wrapping_sub(nc) < 0) && a_after >= 0; let did_overflow = over || under;