CS 212 Section 4
2/18/2002

=== If's ===
BALI:
	main()
	    int x;
	    x := 7;
	    if ( (x = 5) )
		x := 10;
	    else {
		if ( (x > 5) )
		    x := 20;
		else 
		    x := 30;
	    }
	    return x;

SAM:
	ADDSP 2			// Adjust sp for rv, x
	PUSHIMM 7		// Push 7 on the stack
	STOREOFF 1		// Store 7 for x
	PUSHOFF 1		// Push the value of x to compare
	PUSHIMM 5		// Push the value to compare with x
	EQUAL			// Compare x to 5
	JUMPC correct		// result of equal (0 or 1)
	PUSHOFF 1		// false: push value of x to compare
	PUSHIMM 5		// 	  push value to compare with x
	GREATER			// 	  compare x > 5
	JUMPC nestedCorrect	// 	  result of GREATER (0 or 1)
	PUSHIMM 30		// 	  false: push 30
	STOREOFF 1		// 	  	 store 30 for x
	JUMP continue		// 		 skip to continue label
	nestedCorrect:		// 	  label for executing x := 20;
	PUSHIMM 20		// 	  true: push value 20
	STOREOFF 1		// 		store 20 for x
	JUMP continue		// 		skip to continue label
	correct:		// label for executing x := 10;
	PUSHIMM 10		// true: push value 10
	STOREOFF 1		// 	 Store 10 for x
	JUMP continue		//	 skip to continue label (redundant code)
	continue:		// label after all the if stmts
	PUSHOFF 1		// Push the value of x to top of stack
	STOREOFF 0		// Store the value of x in the rv
	ADDSP -1		// Adjust sp so program returns rv
	STOP			// stop the program