chore: pass destoer's cond_invalid test

README.md

@@ -15,7 +15,7 @@ An in-progress Gameboy Advance Emulator written in Zig ⚡!
     - [x] `midikey2freq`
     - [ ] `swi-tests-random`
 - [ ] [destoer's GBA Tests](https://github.com/destoer/gba_tests)
-    - [ ] `cond_invalid.gba`
+    - [x] `cond_invalid.gba`
     - [x] `dma_priority.gba`
     - [x] `hello_world.gba`
     - [x] `if_ack.gba`

src/cpu.zig

@@ -459,7 +459,7 @@ pub fn checkCond(cpsr: PSR, cond: u4) bool {
         0xC => !cpsr.z.read() and (cpsr.n.read() == cpsr.v.read()), // GT - Greater than
         0xD => cpsr.z.read() or (cpsr.n.read() != cpsr.v.read()), // LE - Less than or equal
         0xE => true, // AL - Always
-        0xF => std.debug.panic("[CPU/Cond] 0xF is a reserved condition field", .{}),
+        0xF => false, // NV - Never (reserved in ARMv3 and up, but seems to have not changed?)
     };
 }