diff --git a/tests/mir-opt/const_prop/transmute.rs b/tests/mir-opt/const_prop/transmute.rs
index 8f9d1e77ab4ff..99988d0599454 100644
--- a/tests/mir-opt/const_prop/transmute.rs
+++ b/tests/mir-opt/const_prop/transmute.rs
@@ -1,4 +1,3 @@
-// skip-filecheck
 // unit-test: ConstProp
 // compile-flags: -O --crate-type=lib
 // ignore-endian-big
@@ -8,55 +7,77 @@ use std::mem::transmute;
 
 // EMIT_MIR transmute.less_as_i8.ConstProp.diff
 pub fn less_as_i8() -> i8 {
+    // CHECK-LABEL: fn less_as_i8(
+    // CHECK: _0 = const -1_i8;
     unsafe { transmute(std::cmp::Ordering::Less) }
 }
 
 // EMIT_MIR transmute.from_char.ConstProp.diff
 pub fn from_char() -> i32 {
+    // CHECK-LABEL: fn from_char(
+    // CHECK: _0 = const 82_i32;
     unsafe { transmute('R') }
 }
 
 // EMIT_MIR transmute.valid_char.ConstProp.diff
 pub fn valid_char() -> char {
+    // CHECK-LABEL: fn valid_char(
+    // CHECK: _0 = const 'R';
     unsafe { transmute(0x52_u32) }
 }
 
 // EMIT_MIR transmute.invalid_char.ConstProp.diff
 pub unsafe fn invalid_char() -> char {
+    // CHECK-LABEL: fn invalid_char(
+    // CHECK: _0 = const {transmute(0x7fffffff): char};
     unsafe { transmute(i32::MAX) }
 }
 
 // EMIT_MIR transmute.invalid_bool.ConstProp.diff
 pub unsafe fn invalid_bool() -> bool {
+    // CHECK-LABEL: fn invalid_bool(
+    // CHECK: _0 = const {transmute(0xff): bool};
     unsafe { transmute(-1_i8) }
 }
 
 // EMIT_MIR transmute.undef_union_as_integer.ConstProp.diff
 pub unsafe fn undef_union_as_integer() -> u32 {
+    // CHECK-LABEL: fn undef_union_as_integer(
+    // CHECK: _1 = Union32 {
+    // CHECK: _0 = move _1 as u32 (Transmute);
     union Union32 { value: u32, unit: () }
     unsafe { transmute(Union32 { unit: () }) }
 }
 
 // EMIT_MIR transmute.unreachable_direct.ConstProp.diff
 pub unsafe fn unreachable_direct() -> ! {
+    // CHECK-LABEL: fn unreachable_direct(
+    // CHECK: [[unit:_.*]] = ();
+    // CHECK: move [[unit]] as Never (Transmute);
     let x: Never = unsafe { transmute(()) };
     match x {}
 }
 
 // EMIT_MIR transmute.unreachable_ref.ConstProp.diff
 pub unsafe fn unreachable_ref() -> ! {
+    // CHECK-LABEL: fn unreachable_ref(
+    // CHECK: = const {0x1 as &Never};
     let x: &Never = unsafe { transmute(1_usize) };
     match *x {}
 }
 
 // EMIT_MIR transmute.unreachable_mut.ConstProp.diff
 pub unsafe fn unreachable_mut() -> ! {
+    // CHECK-LABEL: fn unreachable_mut(
+    // CHECK: = const {0x1 as &mut Never};
     let x: &mut Never = unsafe { transmute(1_usize) };
     match *x {}
 }
 
 // EMIT_MIR transmute.unreachable_box.ConstProp.diff
 pub unsafe fn unreachable_box() -> ! {
+    // CHECK-LABEL: fn unreachable_box(
+    // CHECK: = const Box::<Never>(
     let x: Box<Never> = unsafe { transmute(1_usize) };
     match *x {}
 }
diff --git a/tests/mir-opt/dataflow-const-prop/transmute.rs b/tests/mir-opt/dataflow-const-prop/transmute.rs
index 16597b16083cb..02e4f1e501346 100644
--- a/tests/mir-opt/dataflow-const-prop/transmute.rs
+++ b/tests/mir-opt/dataflow-const-prop/transmute.rs
@@ -1,4 +1,3 @@
-// skip-filecheck
 // unit-test: DataflowConstProp
 // compile-flags: -O --crate-type=lib
 // ignore-endian-big
@@ -8,55 +7,77 @@ use std::mem::transmute;
 
 // EMIT_MIR transmute.less_as_i8.DataflowConstProp.diff
 pub fn less_as_i8() -> i8 {
+    // CHECK-LABEL: fn less_as_i8(
+    // FIXME-CHECK: _0 = const -1_i8;
     unsafe { transmute(std::cmp::Ordering::Less) }
 }
 
 // EMIT_MIR transmute.from_char.DataflowConstProp.diff
 pub fn from_char() -> i32 {
+    // CHECK-LABEL: fn from_char(
+    // CHECK: _0 = const 82_i32;
     unsafe { transmute('R') }
 }
 
 // EMIT_MIR transmute.valid_char.DataflowConstProp.diff
 pub fn valid_char() -> char {
+    // CHECK-LABEL: fn valid_char(
+    // CHECK: _0 = const 'R';
     unsafe { transmute(0x52_u32) }
 }
 
 // EMIT_MIR transmute.invalid_char.DataflowConstProp.diff
 pub unsafe fn invalid_char() -> char {
+    // CHECK-LABEL: fn invalid_char(
+    // CHECK: _0 = const {transmute(0x7fffffff): char};
     unsafe { transmute(i32::MAX) }
 }
 
 // EMIT_MIR transmute.invalid_bool.DataflowConstProp.diff
 pub unsafe fn invalid_bool() -> bool {
+    // CHECK-LABEL: fn invalid_bool(
+    // CHECK: _0 = const {transmute(0xff): bool};
     unsafe { transmute(-1_i8) }
 }
 
 // EMIT_MIR transmute.undef_union_as_integer.DataflowConstProp.diff
 pub unsafe fn undef_union_as_integer() -> u32 {
+    // CHECK-LABEL: fn undef_union_as_integer(
+    // CHECK: _1 = Union32 {
+    // CHECK: _0 = move _1 as u32 (Transmute);
     union Union32 { value: u32, unit: () }
     unsafe { transmute(Union32 { unit: () }) }
 }
 
 // EMIT_MIR transmute.unreachable_direct.DataflowConstProp.diff
 pub unsafe fn unreachable_direct() -> ! {
+    // CHECK-LABEL: fn unreachable_direct(
+    // CHECK: [[unit:_.*]] = ();
+    // CHECK: move [[unit]] as Never (Transmute);
     let x: Never = unsafe { transmute(()) };
     match x {}
 }
 
 // EMIT_MIR transmute.unreachable_ref.DataflowConstProp.diff
 pub unsafe fn unreachable_ref() -> ! {
+    // CHECK-LABEL: fn unreachable_ref(
+    // CHECK: = const {0x1 as &Never};
     let x: &Never = unsafe { transmute(1_usize) };
     match *x {}
 }
 
 // EMIT_MIR transmute.unreachable_mut.DataflowConstProp.diff
 pub unsafe fn unreachable_mut() -> ! {
+    // CHECK-LABEL: fn unreachable_mut(
+    // CHECK: = const {0x1 as &mut Never};
     let x: &mut Never = unsafe { transmute(1_usize) };
     match *x {}
 }
 
 // EMIT_MIR transmute.unreachable_box.DataflowConstProp.diff
 pub unsafe fn unreachable_box() -> ! {
+    // CHECK-LABEL: fn unreachable_box(
+    // CHECK: = const Box::<Never>(
     let x: Box<Never> = unsafe { transmute(1_usize) };
     match *x {}
 }