SMTChecker fix: Do not unroll loop after it completes

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_6.sol

@@ -0,0 +1,26 @@
+contract C
+{
+	uint x;
+	uint y;
+
+	function condition() private returns(bool) {
+		x = (x + 1) % 2;
+		return (x == 1);
+	}
+
+	function f() public {
+		require(x == 0);
+		require(y == 0);
+		do {
+			++y;
+		} while (condition());
+		assert(y == 2);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Warning 2661: (85-90): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_semantics_2.sol

@@ -9,7 +9,7 @@ contract C {
 		} while (x < 3 || y == 1);
         // BMC loop iteration setting is just enough to leave the loop
 		assert(x == 3); // should hold
-		assert(y == 1); // should hold
+		assert(y == 1); // should fail, when x == 3 loop is completed
 	}
 }
 // ====
@@ -17,4 +17,5 @@ contract C {
 // SMTSolvers: z3
 // BMCLoopIterations: 4
 // ----
-// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.
+// Warning 4661: (244-258): BMC: Assertion violation happens here.
+// Info 6002: BMC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_semantics_3.sol

@@ -9,7 +9,7 @@ contract C {
 		} while (x < 3 || y == 1);
         // BMC loop iteration setting is more than enough to leave the loop
 		assert(x == 3); // should hold
-		assert(y == 1); // should hold
+		assert(y == 0); // should hold
 	}
 }
 // ====

test/libsolidity/smtCheckerTests/loops/do_while_bmc_iterations_semantics_4.sol

@@ -0,0 +1,20 @@
+contract C {
+	function f() public pure {
+		uint x = 0;
+		int y = 0;
+		do {
+            ++x;
+			if (x >= 3)
+				y = 1;
+		} while (x < 3 || y == 1);
+        // BMC loop iteration setting is more than enough to leave the loop
+		assert(x == 3); // should hold
+		assert(y == 1); // should hold
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Info 6002: BMC: 3 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/for_loop_bmc_iterations_9.sol

@@ -0,0 +1,26 @@
+contract C
+{
+	uint x;
+	uint y;
+
+	function condition() private returns(bool) {
+		x = (x + 1) % 2;
+		return (x == 1);
+	}
+
+	function f() public {
+		require(x == 0);
+		require(y == 0);
+		for (; condition();) {
+			++y;
+		}
+		assert(y == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Warning 2661: (85-90): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.

test/libsolidity/smtCheckerTests/loops/while_bmc_iterations_6.sol

@@ -0,0 +1,26 @@
+contract C
+{
+	uint x;
+	uint y;
+
+	function condition() private returns(bool) {
+		x = (x + 1) % 2;
+		return (x == 1);
+	}
+
+	function f() public {
+		require(x == 0);
+		require(y == 0);
+		while (condition()) {
+			++y;
+		}
+		assert(y == 1);
+	}
+}
+// ====
+// SMTEngine: bmc
+// SMTSolvers: z3
+// BMCLoopIterations: 5
+// ----
+// Warning 2661: (85-90): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Info 6002: BMC: 4 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.