Handle jumpif.

test/asm_code/arith.fate

@@ -0,0 +1,26 @@
+;; CONTRACT arith
+
+FUNCTION add (integer, integer) : integer
+  ADD a arg0 arg1
+  RETURN
+
+FUNCTION sub (integer, integer) : integer
+  SUB a arg0 arg1
+  RETURN
+
+FUNCTION mul (integer, integer) : integer
+  MUL a arg0 arg1
+  RETURN
+
+FUNCTION div (integer, integer) : integer
+  DIV a arg0 arg1
+  RETURN
+
+FUNCTION mod (integer, integer) : integer
+  MOD a arg0 arg1
+  RETURN
+
+FUNCTION pow (integer, integer) : integer
+  POW a arg0 arg1
+  RETURN
+

test/asm_code/jumpif.fate

@@ -0,0 +1,9 @@
+;; CONTRACT jumpif
+FUNCTION skip(integer, integer) : integer
+ PUSH arg1
+ PUSH 0
+ EQ a a arg0
+ JUMPIF a 2
+ INC
+ JUMP 2
+ RETURN