[PGO] Avoid instrumenting constants at value sites

Value profiling should not profile constants and/or constant
expressions when they appear as callees in call instructions.
Constant expressions form when a direct callee has bitcasts or
inttoptr(ptrtint (callee)) nests surrounding it. Value profiling
should avoid instrumenting such cases. Mostly NFC.

llvm-svn: 265037

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/test/Profile/c-avoid-direct-call.c b/clang/test/Profile/c-avoid-direct-call.c
new file mode 100644
index 00000000000..cd02e714dbe
--- /dev/null
+++ b/clang/test/Profile/c-avoid-direct-call.c
@@ -0,0 +1,11 @@
+// Check the value profiling instrinsics emitted by instrumentation.
+
+// RUN: %clang_cc1 -triple x86_64-apple-macosx10.9 -main-file-name c-avoid-direct-call.c %s -o - -emit-llvm -fprofile-instrument=clang -mllvm -enable-value-profiling | FileCheck %s
+
+void foo();
+
+int main(void) {
+// CHECK-NOT: call void @__llvm_profile_instrument_target
+  foo(21);
+  return 0;
+}