+; RUN: opt < %s -loop-unswitch -loop-unswitch-with-block-frequency -S 2>&1 | FileCheck %s
+
+;; trivial condition should be unswithed regardless of coldness.
+define i32 @test1(i1 %cond1, i1 %cond2) !prof !1 {
+ br i1 %cond1, label %loop_begin, label %loop_exit, !prof !0
+
+loop_begin:
+; CHECK: br i1 true, label %continue, label %loop_exit.loopexit
+ br i1 %cond2, label %continue, label %loop_exit ; trivial condition
+
+continue:
+ call void @some_func1() noreturn nounwind
+ br label %loop_begin
+
+loop_exit:
+ ret i32 0
+}
+
+;; cold non-trivial condition should not be unswitched.
+define i32 @test2(i32* %var, i1 %cond1, i1 %cond2) !prof !1 {
+ br i1 %cond1, label %loop_begin, label %loop_exit, !prof !0
+
+loop_begin:
+ store i32 1, i32* %var
+; CHECK: br i1 %cond2, label %continue1, label %continue2
+ br i1 %cond2, label %continue1, label %continue2 ; non-trivial condition
+
+continue1:
+ call void @some_func1() noreturn nounwind
+ br label %joint
+
+continue2:
+ call void @some_func2() noreturn nounwind
+ br label %joint
+
+joint:
+;; unswitching will duplicate these calls.
+ call void @some_func3() noreturn nounwind
+ call void @some_func4() noreturn nounwind
+ br label %loop_begin
+
+loop_exit:
+ ret i32 0
+}
+
+declare void @some_func1() noreturn
+declare void @some_func2() noreturn
+declare void @some_func3() noreturn
+declare void @some_func4() noreturn
+
+!0 = !{!"branch_weights", i32 1, i32 100000000}
+!1 = !{!"function_entry_count", i64 100}