Restore xpression_with_dereference test

Author: Simon Camphausen

mlir/test/Dialect/EmitC/transforms.mlir

@@ -64,6 +64,26 @@ func.func @expression_with_call(%arg0: i32, %arg1: i32, %arg2: i32, %arg3: i32)
   return %c : i1
 }
 
+// CHECK-LABEL: func.func @expression_with_dereference(
+// CHECK-SAME:      %[[VAL_0:.*]]: i32, %[[VAL_1:.*]]: i32, %[[VAL_2:.*]]: !emitc.ptr<i32>) -> i1 {
+// CHECK:         %[[VAL_3:.*]] = emitc.expression : i32 {
+// CHECK:           %[[VAL_4:.*]] = emitc.apply "*"(%[[VAL_2]]) : (!emitc.ptr<i32>) -> i32
+// CHECK:           emitc.yield %[[VAL_4]] : i32
+// CHECK:         }
+// CHECK:         %[[VAL_5:.*]] = emitc.expression : i1 {
+// CHECK:           %[[VAL_6:.*]] = emitc.mul %[[VAL_0]], %[[VAL_1]] : (i32, i32) -> i32
+// CHECK:           %[[VAL_7:.*]] = emitc.cmp lt, %[[VAL_6]], %[[VAL_3]] : (i32, i32) -> i1
+// CHECK:         return %[[VAL_5]] : i1
+// CHECK:       }
+
+func.func @expression_with_dereference(%arg0: i32, %arg1: i32, %arg2: !emitc.ptr<i32>) -> i1 {
+  %a = emitc.mul %arg0, %arg1 : (i32, i32) -> i32
+  %b = emitc.apply "*"(%arg2) : (!emitc.ptr<i32>) -> (i32)
+  %c = emitc.cmp lt, %a, %b :(i32, i32) -> i1
+  return %c : i1
+}
+
+
 // CHECK-LABEL: func.func @expression_with_address_taken(
 // CHECK-SAME:      %[[VAL_0:.*]]: i32, %[[VAL_1:.*]]: i32, %[[VAL_2:.*]]: !emitc.ptr<i32>, %[[VAL_3:.*]]: !emitc.lvalue<i32>) -> i1 {
 // CHECK:         %[[VAL_4:.*]] = emitc.expression : i1 {