feat: add custom b-type instruction (jump)

codegen/generate.py

@@ -40,10 +40,11 @@ def mangle(value):
     return (result, c_manglers)
 
 def get_check_code(flag_part, user_part, c_mangler):
-    return f"""if(({flag_part}) != ({c_mangler(user_part)})){{
-    return false;
-}}
-    """
+    variations = [
+        f"custom_jmp_neq({flag_part} ^ 0x7C, {c_mangler(user_part)},        label_false);",
+        f"custom_jmp_neq({flag_part},        {c_mangler(user_part)} ^ 0x7C, label_false);"
+    ]
+    return random.choice(variations)
 
 def main():
     if len(sys.argv) != 3:
@@ -105,6 +106,9 @@ bool check(char* userflag, uint8_t len) {{
     {check}
 
     return true;
+
+    label_false:
+        return false;
 }}
 
 """)

src/emulated/custom_instructions.h

@@ -13,3 +13,12 @@
         _result;                                        \
     })
 
+#define custom_jmp_neq(a, b, label_true)                \
+    asm goto(                                       \
+        ".insn b 0x2B, 0x00, %0, %1, %l2"           \
+        :                                           \
+        : "r" ((int32_t)(a)),                       \
+            "r" ((int32_t)(b))                        \
+        :                                           \
+        : label_true                                \
+    )