Add FileCheck for array_index.rs, boolean_identities.rs and cast.rs

Author: sfzhu93

tests/mir-opt/dataflow-const-prop/array_index.rs

@@ -1,9 +1,19 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // unit-test: DataflowConstProp
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 
 // EMIT_MIR array_index.main.DataflowConstProp.diff
+
+// CHECK-LABEL: fn main() -> () {
 fn main() {
+    // CHECK: let mut [[array_lit:_.*]]: [u32; 4];
+    // CHECK:     debug x => [[x:_.*]];
+
     let x: u32 = [0, 1, 2, 3][2];
+    // CHECK: bb{{[0-9]+}}: {
+    // CHECK:     [[array_lit]] = [const 0_u32, const 1_u32, const 2_u32, const 3_u32];
+    // CHECK:     [[index:_.*]] = const 2_usize;
+    // CHECK: bb{{[0-9]+}}: {
+    // CHECK-NOT: [[x]] = [[array_lit]][[[index]]];
+    // CHECK:     [[x]] = [[array_lit]][2 of 3];
 }

tests/mir-opt/dataflow-const-prop/boolean_identities.rs

@@ -1,11 +1,14 @@
-// skip-filecheck
 // unit-test: DataflowConstProp
 
 // EMIT_MIR boolean_identities.test.DataflowConstProp.diff
+
+// CHECK-LABEL: fn test(
 pub fn test(x: bool, y: bool) -> bool {
     (y | true) & (x & false)
+    // CHECK: _0 = const false;
 }
 
+// CHECK-LABEL: fn main(
 fn main() {
     test(true, false);
 }

tests/mir-opt/dataflow-const-prop/cast.rs

@@ -1,8 +1,14 @@
-// skip-filecheck
 // unit-test: DataflowConstProp
 
 // EMIT_MIR cast.main.DataflowConstProp.diff
+
+// CHECK-LABEL: fn main(
 fn main() {
+    // CHECK: debug a => [[a:_.*]];
+    // CHECK: debug b => [[b:_.*]];
+
+    // CHECK: [[a]] = const 257_i32;
     let a = 257;
+    // CHECK: [[b]] = const 2_u8;
     let b = a as u8 + 1;
 }