[PGO] Skip counter promotion for infinite loops
Differential Revision: http://reviews.llvm.org/D40662
llvm-svn: 319462
diff --git a/llvm/test/Transforms/PGOProfile/infinite_loop.ll b/llvm/test/Transforms/PGOProfile/infinite_loop.ll
new file mode 100644
index 0000000..68e9873
--- /dev/null
+++ b/llvm/test/Transforms/PGOProfile/infinite_loop.ll
@@ -0,0 +1,21 @@
+; RUN: opt < %s -instrprof -S -o - -do-counter-promotion=1 | FileCheck %s
+; CHECK: store
+
+@__profn_foo = private constant [3 x i8] c"foo"
+
+define void @foo() {
+entry:
+ br label %while.body
+
+ while.body: ; preds = %entry, %while.body
+ call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_foo, i32 0, i32 0), i64 14813359968, i32 1, i32 0)
+ call void (...) @bar() #2
+ br label %while.body
+}
+
+declare void @bar(...)
+
+declare void @llvm.instrprof.increment(i8*, i64, i32, i32) #0
+
+attributes #0 = { nounwind }
+