diff --git a/tests/mir-opt/lower_intrinsics.rs b/tests/mir-opt/lower_intrinsics.rs
index 3f6bb916394..913605cc2b2 100644
--- a/tests/mir-opt/lower_intrinsics.rs
+++ b/tests/mir-opt/lower_intrinsics.rs
@@ -1,4 +1,3 @@
-// skip-filecheck
 // unit-test: LowerIntrinsics
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 
@@ -7,6 +6,10 @@
 
 // EMIT_MIR lower_intrinsics.wrapping.LowerIntrinsics.diff
 pub fn wrapping(a: i32, b: i32) {
+    // CHECK-LABEL: fn wrapping(
+    // CHECK: {{_.*}} = Add(
+    // CHECK: {{_.*}} = Sub(
+    // CHECK: {{_.*}} = Mul(
     let _x = core::intrinsics::wrapping_add(a, b);
     let _y = core::intrinsics::wrapping_sub(a, b);
     let _z = core::intrinsics::wrapping_mul(a, b);
@@ -14,6 +17,14 @@ pub fn wrapping(a: i32, b: i32) {
 
 // EMIT_MIR lower_intrinsics.unchecked.LowerIntrinsics.diff
 pub unsafe fn unchecked(a: i32, b: i32) {
+    // CHECK-LABEL: fn unchecked(
+    // CHECK: {{_.*}} = AddUnchecked(
+    // CHECK: {{_.*}} = SubUnchecked(
+    // CHECK: {{_.*}} = MulUnchecked(
+    // CHECK: {{_.*}} = Div(
+    // CHECK: {{_.*}} = Rem(
+    // CHECK: {{_.*}} = ShlUnchecked(
+    // CHECK: {{_.*}} = ShrUnchecked(
     let _a = core::intrinsics::unchecked_add(a, b);
     let _b = core::intrinsics::unchecked_sub(a, b);
     let _c = core::intrinsics::unchecked_mul(a, b);
@@ -25,26 +36,39 @@ pub unsafe fn unchecked(a: i32, b: i32) {
 
 // EMIT_MIR lower_intrinsics.size_of.LowerIntrinsics.diff
 pub fn size_of<T>() -> usize {
+    // CHECK-LABEL: fn size_of(
+    // CHECK: {{_.*}} = SizeOf(T);
     core::intrinsics::size_of::<T>()
 }
 
 // EMIT_MIR lower_intrinsics.align_of.LowerIntrinsics.diff
 pub fn align_of<T>() -> usize {
+    // CHECK-LABEL: fn align_of(
+    // CHECK: {{_.*}} = AlignOf(T);
     core::intrinsics::min_align_of::<T>()
 }
 
 // EMIT_MIR lower_intrinsics.forget.LowerIntrinsics.diff
 pub fn forget<T>(t: T) {
+    // CHECK-LABEL: fn forget(
+    // CHECK-NOT: Drop(
+    // CHECK: return;
+    // CHECK-NOT: Drop(
     core::intrinsics::forget(t)
 }
 
 // EMIT_MIR lower_intrinsics.unreachable.LowerIntrinsics.diff
 pub fn unreachable() -> ! {
+    // CHECK-LABEL: fn unreachable(
+    // CHECK: unreachable;
     unsafe { core::intrinsics::unreachable() };
 }
 
 // EMIT_MIR lower_intrinsics.non_const.LowerIntrinsics.diff
 pub fn non_const<T>() -> usize {
+    // CHECK-LABEL: fn non_const(
+    // CHECK: SizeOf(T);
+
     // Check that lowering works with non-const operand as a func.
     let size_of_t = core::intrinsics::size_of::<T>;
     size_of_t()
@@ -52,33 +76,55 @@ pub fn non_const<T>() -> usize {
 
 // EMIT_MIR lower_intrinsics.transmute_inhabited.LowerIntrinsics.diff
 pub fn transmute_inhabited(c: std::cmp::Ordering) -> i8 {
+    // CHECK-LABEL: fn transmute_inhabited(
+    // CHECK: {{_.*}} = {{.*}} as i8 (Transmute);
+
     unsafe { std::mem::transmute(c) }
 }
 
 // EMIT_MIR lower_intrinsics.transmute_uninhabited.LowerIntrinsics.diff
 pub unsafe fn transmute_uninhabited(u: ()) -> Never {
+    // CHECK-LABEL: fn transmute_uninhabited(
+    // CHECK: {{_.*}} = {{.*}} as Never (Transmute);
+    // CHECK: unreachable;
+
     unsafe { std::mem::transmute::<(), Never>(u) }
 }
 
 // EMIT_MIR lower_intrinsics.transmute_ref_dst.LowerIntrinsics.diff
 pub unsafe fn transmute_ref_dst<T: ?Sized>(u: &T) -> *const T {
+    // CHECK-LABEL: fn transmute_ref_dst(
+    // CHECK: {{_.*}} = {{.*}} as *const T (Transmute);
+
     unsafe { std::mem::transmute(u) }
 }
 
 // EMIT_MIR lower_intrinsics.transmute_to_ref_uninhabited.LowerIntrinsics.diff
 pub unsafe fn transmute_to_ref_uninhabited() -> ! {
+    // CHECK-LABEL: fn transmute_to_ref_uninhabited(
+    // CHECK: {{_.*}} = {{.*}} as &Never (Transmute);
+    // CHECK: unreachable;
+
     let x: &Never = std::mem::transmute(1usize);
     match *x {}
 }
 
 // EMIT_MIR lower_intrinsics.transmute_to_mut_uninhabited.LowerIntrinsics.diff
 pub unsafe fn transmute_to_mut_uninhabited() -> ! {
+    // CHECK-LABEL: fn transmute_to_mut_uninhabited(
+    // CHECK: {{_.*}} = {{.*}} as &mut Never (Transmute);
+    // CHECK: unreachable;
+
     let x: &mut Never = std::mem::transmute(1usize);
     match *x {}
 }
 
 // EMIT_MIR lower_intrinsics.transmute_to_box_uninhabited.LowerIntrinsics.diff
 pub unsafe fn transmute_to_box_uninhabited() -> ! {
+    // CHECK-LABEL: fn transmute_to_box_uninhabited(
+    // CHECK: {{_.*}} = {{.*}} as std::boxed::Box<Never> (Transmute);
+    // CHECK: unreachable;
+
     let x: Box<Never> = std::mem::transmute(1usize);
     match *x {}
 }
@@ -91,6 +137,12 @@ pub enum E {
 
 // EMIT_MIR lower_intrinsics.discriminant.LowerIntrinsics.diff
 pub fn discriminant<T>(t: T) {
+    // CHECK-LABEL: fn discriminant(
+    // CHECK: {{_.*}} = discriminant(
+    // CHECK: {{_.*}} = discriminant(
+    // CHECK: {{_.*}} = discriminant(
+    // CHECK: {{_.*}} = discriminant(
+
     core::intrinsics::discriminant_value(&t);
     core::intrinsics::discriminant_value(&0);
     core::intrinsics::discriminant_value(&());
@@ -105,6 +157,9 @@ pub fn discriminant<T>(t: T) {
 
 // EMIT_MIR lower_intrinsics.f_copy_nonoverlapping.LowerIntrinsics.diff
 pub fn f_copy_nonoverlapping() {
+    // CHECK-LABEL: fn f_copy_nonoverlapping(
+    // CHECK: copy_nonoverlapping({{.*}});
+
     let src = ();
     let mut dst = ();
     unsafe {
@@ -114,6 +169,9 @@ pub fn f_copy_nonoverlapping() {
 
 // EMIT_MIR lower_intrinsics.assume.LowerIntrinsics.diff
 pub fn assume() {
+    // CHECK-LABEL: fn assume(
+    // CHECK: assume({{.*}});
+
     unsafe {
         std::intrinsics::assume(true);
     }
@@ -121,6 +179,11 @@ pub fn assume() {
 
 // EMIT_MIR lower_intrinsics.with_overflow.LowerIntrinsics.diff
 pub fn with_overflow(a: i32, b: i32) {
+    // CHECK-LABEL: fn with_overflow(
+    // CHECK: CheckedAdd(
+    // CHECK: CheckedSub(
+    // CHECK: CheckedMul(
+
     let _x = core::intrinsics::add_with_overflow(a, b);
     let _y = core::intrinsics::sub_with_overflow(a, b);
     let _z = core::intrinsics::mul_with_overflow(a, b);
@@ -128,16 +191,32 @@ pub fn with_overflow(a: i32, b: i32) {
 
 // EMIT_MIR lower_intrinsics.read_via_copy_primitive.LowerIntrinsics.diff
 pub fn read_via_copy_primitive(r: &i32) -> i32 {
+    // CHECK-LABEL: fn read_via_copy_primitive(
+    // CHECK: [[tmp:_.*]] = &raw const (*_1);
+    // CHECK: _0 = (*[[tmp]]);
+    // CHECK: return;
+
     unsafe { core::intrinsics::read_via_copy(r) }
 }
 
 // EMIT_MIR lower_intrinsics.read_via_copy_uninhabited.LowerIntrinsics.diff
 pub fn read_via_copy_uninhabited(r: &Never) -> Never {
+    // CHECK-LABEL: fn read_via_copy_uninhabited(
+    // CHECK: [[tmp:_.*]] = &raw const (*_1);
+    // CHECK: _0 = (*[[tmp]]);
+    // CHECK: unreachable;
+
     unsafe { core::intrinsics::read_via_copy(r) }
 }
 
 // EMIT_MIR lower_intrinsics.write_via_move_string.LowerIntrinsics.diff
 pub fn write_via_move_string(r: &mut String, v: String) {
+    // CHECK-LABEL: fn write_via_move_string(
+    // CHECK: [[ptr:_.*]] = &raw mut (*_1);
+    // CHECK: [[tmp:_.*]] = move _2;
+    // CHECK: (*[[ptr]]) = move [[tmp]];
+    // CHECK: return;
+
     unsafe { core::intrinsics::write_via_move(r, v) }
 }
 
@@ -145,6 +224,10 @@ pub enum Never {}
 
 // EMIT_MIR lower_intrinsics.option_payload.LowerIntrinsics.diff
 pub fn option_payload(o: &Option<usize>, p: &Option<String>) {
+    // CHECK-LABEL: fn option_payload(
+    // CHECK: {{_.*}} = &raw const (((*{{_.*}}) as Some).0: usize);
+    // CHECK: {{_.*}} = &raw const (((*{{_.*}}) as Some).0: std::string::String);
+
     unsafe {
         let _x = core::intrinsics::option_payload_ptr(o);
         let _y = core::intrinsics::option_payload_ptr(p);
@@ -153,5 +236,8 @@ pub fn option_payload(o: &Option<usize>, p: &Option<String>) {
 
 // EMIT_MIR lower_intrinsics.ptr_offset.LowerIntrinsics.diff
 pub unsafe fn ptr_offset(p: *const i32, d: isize) -> *const i32 {
+    // CHECK-LABEL: fn ptr_offset(
+    // CHECK: _0 = Offset(
+
     core::intrinsics::offset(p, d)
 }