+++ /dev/null
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -passes='simple-loop-unswitch<nontrivial>' -S < %s | FileCheck %s
-
-; If we try to replace uses of `true` outside of `@foo`, we'll see it here.
-define i1 @bar() {
-; CHECK-LABEL: @bar(
-; CHECK-NEXT: ret i1 true
-;
- ret i1 true
-}
-
-; We shouldn't unswitch this loop.
-define void @foo() {
-; CHECK-LABEL: @foo(
-; CHECK-NEXT: entry:
-; CHECK-NEXT: br label [[HEADER:%.*]]
-; CHECK: header:
-; CHECK-NEXT: [[VAL:%.*]] = select i1 true, i1 true, i1 false
-; CHECK-NEXT: br i1 true, label [[EXIT:%.*]], label [[HEADER]]
-; CHECK: exit:
-; CHECK-NEXT: ret void
-;
-entry:
- br label %header
-
-header:
- %val = select i1 true, i1 true, i1 false
- br i1 %val, label %exit, label %header
-
-exit:
- ret void
-}
--- /dev/null
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes='simple-loop-unswitch<nontrivial>' -S < %s | FileCheck %s
+
+; If we try to replace uses of `true` outside of `@foo`, we'll see it here.
+define i1 @bar() {
+; CHECK-LABEL: @bar(
+; CHECK-NEXT: ret i1 true
+;
+ ret i1 true
+}
+
+; We shouldn't unswitch this loop.
+define void @foo() {
+; CHECK-LABEL: @foo(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: br label [[HEADER:%.*]]
+; CHECK: header:
+; CHECK-NEXT: [[VAL:%.*]] = select i1 true, i1 true, i1 false
+; CHECK-NEXT: br i1 true, label [[EXIT:%.*]], label [[HEADER]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ br label %header
+
+header:
+ %val = select i1 true, i1 true, i1 false
+ br i1 %val, label %exit, label %header
+
+exit:
+ ret void
+}
+
+define void @unswitch_trivial_select(i1 %c.1, i1 %c.2, i8 %a) {
+; CHECK-LABEL: @unswitch_trivial_select(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: br i1 [[C_1:%.*]], label [[PH_1:%.*]], label [[EXIT:%.*]]
+; CHECK: ph.1:
+; CHECK-NEXT: br i1 [[C_2:%.*]], label [[PH_2:%.*]], label [[EXIT]]
+; CHECK: ph.2:
+; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8 [[A:%.*]], 30
+; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP]], i1 true, i1 false
+; CHECK-NEXT: [[CMP_FR:%.*]] = freeze i1 [[CMP]]
+; CHECK-NEXT: br i1 [[CMP_FR]], label [[PH_2_SPLIT_US:%.*]], label [[PH_2_SPLIT:%.*]]
+; CHECK: ph.2.split.us:
+; CHECK-NEXT: br label [[LOOP_US:%.*]]
+; CHECK: loop.us:
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: br label [[EXIT_LOOPEXIT_SPLIT_US:%.*]]
+; CHECK: exit.loopexit.split.us:
+; CHECK-NEXT: br label [[EXIT_LOOPEXIT:%.*]]
+; CHECK: ph.2.split:
+; CHECK-NEXT: br label [[LOOP:%.*]]
+; CHECK: loop:
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: br label [[LOOP_LATCH:%.*]]
+; CHECK: loop.latch:
+; CHECK-NEXT: br label [[LOOP]]
+; CHECK: exit.loopexit:
+; CHECK-NEXT: br label [[EXIT]]
+; CHECK: exit:
+; CHECK-NEXT: ret void
+;
+entry:
+ br i1 %c.1, label %ph.1, label %exit
+
+ph.1:
+ br i1 %c.2, label %ph.2, label %exit
+
+ph.2:
+ %cmp = icmp eq i8 %a, 30
+ %sel = select i1 %cmp, i1 true, i1 false
+ br label %loop
+
+loop:
+ call void @foo()
+ br i1 %sel, label %exit, label %loop.latch
+
+loop.latch:
+ br label %loop
+
+exit:
+ ret void
+}