[PGO] Add a test case for infinite loops

Differential Revision: http://reviews.llvm.org/D40663

llvm-svn: 319463

compiler-rt/test/profile/infinite_loop.c

@@ -0,0 +1,30 @@
+// RUN: %clang_pgogen  -O2 -o %t %s
+// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t
+// RUN: llvm-profdata show -function main -counts  %t.profraw| FileCheck  %s 
+
+void exit(int);
+int g;
+__attribute__((noinline)) void foo()
+{
+  g++;
+  if (g==1000)
+    exit(0);
+}
+
+
+int main()
+{
+  while (1) {
+    foo();
+  }
+
+}
+
+// CHECK: Counters:
+// CHECK-NEXT:  main:
+// CHECK-NEXT:    Hash: {{.*}}
+// CHECK-NEXT:    Counters: 1
+// CHECK-NEXT:    Block counts: [1000]
+
+
+