vnf: also set the carry on a zero compare

Add also a test to further check corner cases on compare instructions.

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/vnf/src/lib.rs b/lib/vnf/src/lib.rs
index a46d291..6c0a6f2 100644
--- a/lib/vnf/src/lib.rs
+++ b/lib/vnf/src/lib.rs
@@ -834,7 +834,7 @@ impl Machine {
         // And set flags accordingly.
         self.status_register.zero = res == 0;
         self.status_register.negative = (res as u8 & 0x80) == 0x80;
-        self.status_register.carry = (res as u16 & 0xFF00) != 0;
+        self.status_register.carry = res >= 0;
 
         Ok(())
     }