diff --git a/tests/mir-opt/bool_compare.rs b/tests/mir-opt/bool_compare.rs
deleted file mode 100644
index 3de3fb93d15..00000000000
--- a/tests/mir-opt/bool_compare.rs
+++ /dev/null
@@ -1,29 +0,0 @@
-// skip-filecheck
-// unit-test: InstSimplify
-
-// EMIT_MIR bool_compare.opt1.InstSimplify.diff
-fn opt1(x: bool) -> u32 {
-    if x != true { 0 } else { 1 }
-}
-
-// EMIT_MIR bool_compare.opt2.InstSimplify.diff
-fn opt2(x: bool) -> u32 {
-    if true != x { 0 } else { 1 }
-}
-
-// EMIT_MIR bool_compare.opt3.InstSimplify.diff
-fn opt3(x: bool) -> u32 {
-    if x == false { 0 } else { 1 }
-}
-
-// EMIT_MIR bool_compare.opt4.InstSimplify.diff
-fn opt4(x: bool) -> u32 {
-    if false == x { 0 } else { 1 }
-}
-
-fn main() {
-    opt1(false);
-    opt2(false);
-    opt3(false);
-    opt4(false);
-}
diff --git a/tests/mir-opt/equal_true.opt.InstSimplify.diff b/tests/mir-opt/equal_true.opt.InstSimplify.diff
deleted file mode 100644
index 88a51000c93..00000000000
--- a/tests/mir-opt/equal_true.opt.InstSimplify.diff
+++ /dev/null
@@ -1,36 +0,0 @@
-- // MIR for `opt` before InstSimplify
-+ // MIR for `opt` after InstSimplify
-  
-  fn opt(_1: bool) -> i32 {
-      debug x => _1;
-      let mut _0: i32;
-      let mut _2: bool;
-      let mut _3: bool;
-  
-      bb0: {
-          StorageLive(_2);
-          StorageLive(_3);
-          _3 = _1;
--         _2 = Eq(move _3, const true);
-+         _2 = move _3;
-          switchInt(move _2) -> [0: bb2, otherwise: bb1];
-      }
-  
-      bb1: {
-          StorageDead(_3);
-          _0 = const 0_i32;
-          goto -> bb3;
-      }
-  
-      bb2: {
-          StorageDead(_3);
-          _0 = const 1_i32;
-          goto -> bb3;
-      }
-  
-      bb3: {
-          StorageDead(_2);
-          return;
-      }
-  }
-  
diff --git a/tests/mir-opt/equal_true.rs b/tests/mir-opt/equal_true.rs
deleted file mode 100644
index 8d7cfe73ffc..00000000000
--- a/tests/mir-opt/equal_true.rs
+++ /dev/null
@@ -1,12 +0,0 @@
-// skip-filecheck
-// unit-test InstSimplify
-
-// EMIT_MIR equal_true.opt.InstSimplify.diff
-
-fn opt(x: bool) -> i32 {
-    if x == true { 0 } else { 1 }
-}
-
-fn main() {
-    opt(true);
-}
diff --git a/tests/mir-opt/bool_compare.opt3.InstSimplify.diff b/tests/mir-opt/instsimplify/bool_compare.eq_false.InstSimplify.diff
similarity index 83%
rename from tests/mir-opt/bool_compare.opt3.InstSimplify.diff
rename to tests/mir-opt/instsimplify/bool_compare.eq_false.InstSimplify.diff
index 034d5e44013..5c09963d433 100644
--- a/tests/mir-opt/bool_compare.opt3.InstSimplify.diff
+++ b/tests/mir-opt/instsimplify/bool_compare.eq_false.InstSimplify.diff
@@ -1,7 +1,7 @@
-- // MIR for `opt3` before InstSimplify
-+ // MIR for `opt3` after InstSimplify
+- // MIR for `eq_false` before InstSimplify
++ // MIR for `eq_false` after InstSimplify
   
-  fn opt3(_1: bool) -> u32 {
+  fn eq_false(_1: bool) -> u32 {
       debug x => _1;
       let mut _0: u32;
       let mut _2: bool;
diff --git a/tests/mir-opt/instsimplify/bool_compare.eq_true.InstSimplify.diff b/tests/mir-opt/instsimplify/bool_compare.eq_true.InstSimplify.diff
new file mode 100644
index 00000000000..a80133b0eb0
--- /dev/null
+++ b/tests/mir-opt/instsimplify/bool_compare.eq_true.InstSimplify.diff
@@ -0,0 +1,36 @@
+- // MIR for `eq_true` before InstSimplify
++ // MIR for `eq_true` after InstSimplify
+  
+  fn eq_true(_1: bool) -> u32 {
+      debug x => _1;
+      let mut _0: u32;
+      let mut _2: bool;
+      let mut _3: bool;
+  
+      bb0: {
+          StorageLive(_2);
+          StorageLive(_3);
+          _3 = _1;
+-         _2 = Eq(move _3, const true);
++         _2 = move _3;
+          switchInt(move _2) -> [0: bb2, otherwise: bb1];
+      }
+  
+      bb1: {
+          StorageDead(_3);
+          _0 = const 0_u32;
+          goto -> bb3;
+      }
+  
+      bb2: {
+          StorageDead(_3);
+          _0 = const 1_u32;
+          goto -> bb3;
+      }
+  
+      bb3: {
+          StorageDead(_2);
+          return;
+      }
+  }
+  
diff --git a/tests/mir-opt/bool_compare.opt4.InstSimplify.diff b/tests/mir-opt/instsimplify/bool_compare.false_eq.InstSimplify.diff
similarity index 83%
rename from tests/mir-opt/bool_compare.opt4.InstSimplify.diff
rename to tests/mir-opt/instsimplify/bool_compare.false_eq.InstSimplify.diff
index d3096da6c5a..8235d5263bb 100644
--- a/tests/mir-opt/bool_compare.opt4.InstSimplify.diff
+++ b/tests/mir-opt/instsimplify/bool_compare.false_eq.InstSimplify.diff
@@ -1,7 +1,7 @@
-- // MIR for `opt4` before InstSimplify
-+ // MIR for `opt4` after InstSimplify
+- // MIR for `false_eq` before InstSimplify
++ // MIR for `false_eq` after InstSimplify
   
-  fn opt4(_1: bool) -> u32 {
+  fn false_eq(_1: bool) -> u32 {
       debug x => _1;
       let mut _0: u32;
       let mut _2: bool;
diff --git a/tests/mir-opt/instsimplify/bool_compare.false_ne.InstSimplify.diff b/tests/mir-opt/instsimplify/bool_compare.false_ne.InstSimplify.diff
new file mode 100644
index 00000000000..77d076c6c14
--- /dev/null
+++ b/tests/mir-opt/instsimplify/bool_compare.false_ne.InstSimplify.diff
@@ -0,0 +1,36 @@
+- // MIR for `false_ne` before InstSimplify
++ // MIR for `false_ne` after InstSimplify
+  
+  fn false_ne(_1: bool) -> u32 {
+      debug x => _1;
+      let mut _0: u32;
+      let mut _2: bool;
+      let mut _3: bool;
+  
+      bb0: {
+          StorageLive(_2);
+          StorageLive(_3);
+          _3 = _1;
+-         _2 = Ne(const false, move _3);
++         _2 = move _3;
+          switchInt(move _2) -> [0: bb2, otherwise: bb1];
+      }
+  
+      bb1: {
+          StorageDead(_3);
+          _0 = const 0_u32;
+          goto -> bb3;
+      }
+  
+      bb2: {
+          StorageDead(_3);
+          _0 = const 1_u32;
+          goto -> bb3;
+      }
+  
+      bb3: {
+          StorageDead(_2);
+          return;
+      }
+  }
+  
diff --git a/tests/mir-opt/not_equal_false.opt.InstSimplify.diff b/tests/mir-opt/instsimplify/bool_compare.ne_false.InstSimplify.diff
similarity index 83%
rename from tests/mir-opt/not_equal_false.opt.InstSimplify.diff
rename to tests/mir-opt/instsimplify/bool_compare.ne_false.InstSimplify.diff
index 1342966aa15..2362b11297e 100644
--- a/tests/mir-opt/not_equal_false.opt.InstSimplify.diff
+++ b/tests/mir-opt/instsimplify/bool_compare.ne_false.InstSimplify.diff
@@ -1,7 +1,7 @@
-- // MIR for `opt` before InstSimplify
-+ // MIR for `opt` after InstSimplify
+- // MIR for `ne_false` before InstSimplify
++ // MIR for `ne_false` after InstSimplify
   
-  fn opt(_1: bool) -> u32 {
+  fn ne_false(_1: bool) -> u32 {
       debug x => _1;
       let mut _0: u32;
       let mut _2: bool;
diff --git a/tests/mir-opt/bool_compare.opt1.InstSimplify.diff b/tests/mir-opt/instsimplify/bool_compare.ne_true.InstSimplify.diff
similarity index 83%
rename from tests/mir-opt/bool_compare.opt1.InstSimplify.diff
rename to tests/mir-opt/instsimplify/bool_compare.ne_true.InstSimplify.diff
index 657c11516a1..6ccbd2fb7a1 100644
--- a/tests/mir-opt/bool_compare.opt1.InstSimplify.diff
+++ b/tests/mir-opt/instsimplify/bool_compare.ne_true.InstSimplify.diff
@@ -1,7 +1,7 @@
-- // MIR for `opt1` before InstSimplify
-+ // MIR for `opt1` after InstSimplify
+- // MIR for `ne_true` before InstSimplify
++ // MIR for `ne_true` after InstSimplify
   
-  fn opt1(_1: bool) -> u32 {
+  fn ne_true(_1: bool) -> u32 {
       debug x => _1;
       let mut _0: u32;
       let mut _2: bool;
diff --git a/tests/mir-opt/instsimplify/bool_compare.rs b/tests/mir-opt/instsimplify/bool_compare.rs
new file mode 100644
index 00000000000..77f427b0d7c
--- /dev/null
+++ b/tests/mir-opt/instsimplify/bool_compare.rs
@@ -0,0 +1,68 @@
+// unit-test: InstSimplify
+
+// EMIT_MIR bool_compare.eq_true.InstSimplify.diff
+fn eq_true(x: bool) -> u32 {
+    // CHECK-LABEL: fn eq_true(
+    // CHECK-NOT: Eq(
+    if x == true { 0 } else { 1 }
+}
+
+// EMIT_MIR bool_compare.true_eq.InstSimplify.diff
+fn true_eq(x: bool) -> u32 {
+    // CHECK-LABEL: fn true_eq(
+    // CHECK-NOT: Eq(
+    if true == x { 0 } else { 1 }
+}
+
+// EMIT_MIR bool_compare.ne_true.InstSimplify.diff
+fn ne_true(x: bool) -> u32 {
+    // CHECK-LABEL: fn ne_true(
+    // CHECK: Not(
+    if x != true { 0 } else { 1 }
+}
+
+// EMIT_MIR bool_compare.true_ne.InstSimplify.diff
+fn true_ne(x: bool) -> u32 {
+    // CHECK-LABEL: fn true_ne(
+    // CHECK: Not(
+    if true != x { 0 } else { 1 }
+}
+
+// EMIT_MIR bool_compare.eq_false.InstSimplify.diff
+fn eq_false(x: bool) -> u32 {
+    // CHECK-LABEL: fn eq_false(
+    // CHECK: Not(
+    if x == false { 0 } else { 1 }
+}
+
+// EMIT_MIR bool_compare.false_eq.InstSimplify.diff
+fn false_eq(x: bool) -> u32 {
+    // CHECK-LABEL: fn false_eq(
+    // CHECK: Not(
+    if false == x { 0 } else { 1 }
+}
+
+// EMIT_MIR bool_compare.ne_false.InstSimplify.diff
+fn ne_false(x: bool) -> u32 {
+    // CHECK-LABEL: fn ne_false(
+    // CHECK-NOT: Ne(
+    if x != false { 0 } else { 1 }
+}
+
+// EMIT_MIR bool_compare.false_ne.InstSimplify.diff
+fn false_ne(x: bool) -> u32 {
+    // CHECK-LABEL: fn false_ne(
+    // CHECK-NOT: Ne(
+    if false != x { 0 } else { 1 }
+}
+
+fn main() {
+    eq_true(false);
+    true_eq(false);
+    ne_true(false);
+    true_ne(false);
+    eq_false(false);
+    false_eq(false);
+    ne_false(false);
+    false_ne(false);
+}
diff --git a/tests/mir-opt/instsimplify/bool_compare.true_eq.InstSimplify.diff b/tests/mir-opt/instsimplify/bool_compare.true_eq.InstSimplify.diff
new file mode 100644
index 00000000000..18675329a2e
--- /dev/null
+++ b/tests/mir-opt/instsimplify/bool_compare.true_eq.InstSimplify.diff
@@ -0,0 +1,36 @@
+- // MIR for `true_eq` before InstSimplify
++ // MIR for `true_eq` after InstSimplify
+  
+  fn true_eq(_1: bool) -> u32 {
+      debug x => _1;
+      let mut _0: u32;
+      let mut _2: bool;
+      let mut _3: bool;
+  
+      bb0: {
+          StorageLive(_2);
+          StorageLive(_3);
+          _3 = _1;
+-         _2 = Eq(const true, move _3);
++         _2 = move _3;
+          switchInt(move _2) -> [0: bb2, otherwise: bb1];
+      }
+  
+      bb1: {
+          StorageDead(_3);
+          _0 = const 0_u32;
+          goto -> bb3;
+      }
+  
+      bb2: {
+          StorageDead(_3);
+          _0 = const 1_u32;
+          goto -> bb3;
+      }
+  
+      bb3: {
+          StorageDead(_2);
+          return;
+      }
+  }
+  
diff --git a/tests/mir-opt/bool_compare.opt2.InstSimplify.diff b/tests/mir-opt/instsimplify/bool_compare.true_ne.InstSimplify.diff
similarity index 83%
rename from tests/mir-opt/bool_compare.opt2.InstSimplify.diff
rename to tests/mir-opt/instsimplify/bool_compare.true_ne.InstSimplify.diff
index bc8be62bd49..dc91cf8a5c4 100644
--- a/tests/mir-opt/bool_compare.opt2.InstSimplify.diff
+++ b/tests/mir-opt/instsimplify/bool_compare.true_ne.InstSimplify.diff
@@ -1,7 +1,7 @@
-- // MIR for `opt2` before InstSimplify
-+ // MIR for `opt2` after InstSimplify
+- // MIR for `true_ne` before InstSimplify
++ // MIR for `true_ne` after InstSimplify
   
-  fn opt2(_1: bool) -> u32 {
+  fn true_ne(_1: bool) -> u32 {
       debug x => _1;
       let mut _0: u32;
       let mut _2: bool;
diff --git a/tests/mir-opt/not_equal_false.rs b/tests/mir-opt/not_equal_false.rs
deleted file mode 100644
index 8008df79ceb..00000000000
--- a/tests/mir-opt/not_equal_false.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-// skip-filecheck
-// unit-test: InstSimplify
-// EMIT_MIR not_equal_false.opt.InstSimplify.diff
-
-fn opt(x: bool) -> u32 {
-    if x != false { 0 } else { 1 }
-}
-
-fn main() {
-    opt(false);
-}