Add FileCheck annotations to const_prop tests

tests/mir-opt/const_prop/address_of_pair.rs

@@ -1,8 +1,21 @@
-// skip-filecheck
 // unit-test: ConstProp
 
 // EMIT_MIR address_of_pair.fn0.ConstProp.diff
 pub fn fn0() -> bool {
+    // CHECK-LABEL: fn fn0(
+    // CHECK: debug pair => [[pair:_.*]];
+    // CHECK: debug ptr => [[ptr:_.*]];
+    // CHECK: debug ret => [[ret:_.*]];
+    // CHECK: (*[[ptr]]) = const true;
+    // CHECK-NOT: = const false;
+    // CHECK-NOT: = const true;
+    // CHECK: [[tmp:_.*]] = ([[pair]].1: bool);
+    // CHECK-NOT: = const false;
+    // CHECK-NOT: = const true;
+    // CHECK: [[ret]] = Not(move [[tmp]]);
+    // CHECK-NOT: = const false;
+    // CHECK-NOT: = const true;
+    // CHECK: _0 = [[ret]];
     let mut pair = (1, false);
     let ptr = core::ptr::addr_of_mut!(pair.1);
     pair = (1, false);

tests/mir-opt/const_prop/aggregate.rs

@@ -1,19 +1,29 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // unit-test: ConstProp
 // compile-flags: -O
 
 // EMIT_MIR aggregate.main.ConstProp.diff
-// EMIT_MIR aggregate.main.PreCodegen.after.mir
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: debug x => [[x:_.*]];
+    // CHECK-NOT: = Add(
+    // CHECK: [[x]] = const 1_u8;
+    // CHECK-NOT: = Add(
+    // CHECK: foo(const 1_u8)
     let x = (0, 1, 2).1 + 0;
     foo(x);
 }
 
+// Verify that we still propagate if part of the aggregate is not known.
 // EMIT_MIR aggregate.foo.ConstProp.diff
-// EMIT_MIR aggregate.foo.PreCodegen.after.mir
 fn foo(x: u8) {
-    // Verify that we still propagate if part of the aggregate is not known.
+    // CHECK-LABEL: fn foo(
+    // CHECK: debug first => [[first:_.*]];
+    // CHECK: debug second => [[second:_.*]];
+    // CHECK-NOT: = Add(
+    // CHECK: [[first]] = const 1_i32;
+    // CHECK-NOT: = Add(
+    // CHECK: [[second]] = const 3_i32;
     let first = (0, x).0 + 1;
     let second = (x, 1).1 + 2;
 }

tests/mir-opt/const_prop/array_index.rs

@@ -1,9 +1,11 @@
-// skip-filecheck
-// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // unit-test: ConstProp
+// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 
 // EMIT_MIR array_index.main.ConstProp.diff
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: debug x => [[x:_.*]];
+    // CHECK: [[x]] = const 2_u32;
     let x: u32 = [0, 1, 2, 3][2];
 }

tests/mir-opt/const_prop/bad_op_div_by_zero.rs

@@ -1,9 +1,15 @@
-// skip-filecheck
-// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // unit-test: ConstProp
+// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
+
 // EMIT_MIR bad_op_div_by_zero.main.ConstProp.diff
 #[allow(unconditional_panic)]
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: debug y => [[y:_.*]];
+    // CHECK: debug _z => [[z:_.*]];
+    // CHECK: assert(!const true, "attempt to divide `{}` by zero", const 1_i32)
+    // CHECK: assert(!const false, "attempt to compute `{} / {}`, which would overflow", const 1_i32, const 0_i32)
+    // CHECK: [[z]] = Div(const 1_i32, const 0_i32);
     let y = 0;
     let _z = 1 / y;
 }

tests/mir-opt/const_prop/bad_op_mod_by_zero.rs

@@ -1,9 +1,16 @@
-// skip-filecheck
 // unit-test: ConstProp
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
+
 // EMIT_MIR bad_op_mod_by_zero.main.ConstProp.diff
 #[allow(unconditional_panic)]
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: debug y => [[y:_.*]];
+    // CHECK: debug _z => [[z:_.*]];
+    // CHECK: assert(!const true, "attempt to calculate the remainder of `{}` with a divisor of
+    // zero", const 1_i32)
+    // CHECK: assert(!const false, "attempt to compute the remainder of `{} % {}`, which would overflow", const 1_i32, const 0_i32)
+    // CHECK: [[z]] = Rem(const 1_i32, const 0_i32);
     let y = 0;
     let _z = 1 % y;
 }

tests/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.rs

@@ -1,11 +1,14 @@
-// skip-filecheck
 // unit-test: ConstProp
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 
 // EMIT_MIR bad_op_unsafe_oob_for_slices.main.ConstProp.diff
 #[allow(unconditional_panic)]
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: debug a => [[a:_.*]];
+    // CHECK: debug _b => [[b:_.*]];
+    // CHECK: [[b]] = (*[[a]])[3 of 4];
     let a: *const [_] = &[1, 2, 3];
     unsafe {
         let _b = (*a)[3];

tests/mir-opt/const_prop/boolean_identities.rs

@@ -1,10 +1,16 @@
-// skip-filecheck
 // unit-test: ConstProp
-// compile-flags: -O -Zmir-opt-level=4
 
 // EMIT_MIR boolean_identities.test.ConstProp.diff
 pub fn test(x: bool, y: bool) -> bool {
-    (y | true) & (x & false)
+    // CHECK-LABEL: fn test(
+    // CHECK: debug a => [[a:_.*]];
+    // CHECK: debug b => [[b:_.*]];
+    // CHECK: [[a]] = const true;
+    // CHECK: [[b]] = const false;
+    // CHECK: _0 = const false;
+    let a = (y | true);
+    let b = (x & false);
+    a & b
 }
 
 fn main() {

tests/mir-opt/const_prop/boolean_identities.test.ConstProp.diff

@@ -5,20 +5,42 @@
       debug x => _1;
       debug y => _2;
       let mut _0: bool;
-      let mut _3: bool;
+      let _3: bool;
       let mut _4: bool;
-      let mut _5: bool;
       let mut _6: bool;
+      let mut _7: bool;
+      let mut _8: bool;
+      scope 1 {
+          debug a => _3;
+          let _5: bool;
+          scope 2 {
+              debug b => _5;
+          }
+      }
 
       bb0: {
           StorageLive(_3);
--         _3 = BitOr(_2, const true);
+          StorageLive(_4);
+          _4 = _2;
+-         _3 = BitOr(move _4, const true);
 +         _3 = const true;
+          StorageDead(_4);
           StorageLive(_5);
--         _5 = BitAnd(_1, const false);
--         _0 = BitAnd(move _3, move _5);
+          StorageLive(_6);
+          _6 = _1;
+-         _5 = BitAnd(move _6, const false);
 +         _5 = const false;
+          StorageDead(_6);
+          StorageLive(_7);
+-         _7 = _3;
++         _7 = const true;
+          StorageLive(_8);
+-         _8 = _5;
+-         _0 = BitAnd(move _7, move _8);
++         _8 = const false;
 +         _0 = const false;
+          StorageDead(_8);
+          StorageDead(_7);
           StorageDead(_5);
           StorageDead(_3);
           return;

tests/mir-opt/const_prop/boxes.rs

@@ -1,4 +1,3 @@
-// skip-filecheck
 // unit-test: ConstProp
 // compile-flags: -O
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
@@ -9,6 +8,11 @@
 
 // EMIT_MIR boxes.main.ConstProp.diff
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: debug x => [[x:_.*]];
+    // CHECK: (*{{_.*}}) = const 42_i32;
+    // CHECK: [[tmp:_.*]] = (*{{_.*}});
+    // CHECK: [[x]] = Add(move [[tmp]], const 0_i32);
     let x = *(#[rustc_box]
     Box::new(42))
         + 0;

tests/mir-opt/const_prop/cast.rs

@@ -1,9 +1,12 @@
-// skip-filecheck
 // unit-test: ConstProp
 // EMIT_MIR cast.main.ConstProp.diff
 
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: debug x => [[x:_.*]];
+    // CHECK: debug y => [[y:_.*]];
+    // CHECK: [[x]] = const 42_u32;
+    // CHECK: [[y]] = const 42_u8;
     let x = 42u8 as u32;
-
     let y = 42u32 as u8;
 }