[PlaceSafepoints] Add a test.

Calls of functions with the "gc-leaf-function" attribute shouldn't be turned
into a safepoint.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256860 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/PlaceSafepoints/leaf-function.ll b/test/Transforms/PlaceSafepoints/leaf-function.ll
new file mode 100644 (file)
index 0000000..3942abd
--- /dev/null
+++ b/test/Transforms/PlaceSafepoints/leaf-function.ll
@@ -0,0 +1,24 @@
+; RUN: opt %s -S -place-safepoints | FileCheck %s
+
+declare void @foo() "gc-leaf-function"
+
+; Calls of functions with the "gc-leaf-function" attribute shouldn't get
+; safepoints.  An entry safepoint should get inserted, though.
+define void @test_leaf_function() gc "statepoint-example" {
+; CHECK-LABEL: test_leaf_function
+; CHECK: gc.statepoint.p0f_isVoidf
+; CHECK-NOT: statepoint
+; CHECK-NOT: gc.result
+entry:
+  call void @foo()
+  ret void
+}
+
+; This function is inlined when inserting a poll.
+declare void @do_safepoint()
+define void @gc.safepoint_poll() {
+; CHECK-LABEL: gc.safepoint_poll
+entry:
+  call void @do_safepoint()
+  ret void
+}