1 files changed, 101 insertions, 0 deletions
diff --git a/test/Transforms/TailCallElim/reorder_load.ll b/test/Transforms/TailCallElim/reorder_load.ll
new file mode 100644
index 000000000000..aeb9042bc79f
--- /dev/null
+++ b/test/Transforms/TailCallElim/reorder_load.ll
@@ -0,0 +1,101 @@
+; RUN: llvm-as <%s | opt -tailcallelim | llvm-dis | not grep call
+; PR4323
+
+; Several cases where tail call elimination should move the load above the call,
+; then eliminate the tail recursion.
+
+
+@global = external global i32		; <i32*> [#uses=1]
+@extern_weak_global = extern_weak global i32		; <i32*> [#uses=1]
+
+
+; This load can be moved above the call because the function won't write to it
+; and the call has no side effects.
+define fastcc i32 @raise_load_1(i32* %a_arg, i32 %a_len_arg, i32 %start_arg) nounwind readonly {
+entry:
+	%tmp2 = icmp sge i32 %start_arg, %a_len_arg		; <i1> [#uses=1]
+	br i1 %tmp2, label %if, label %else
+
+if:		; preds = %entry
+	ret i32 0
+
+else:		; preds = %entry
+	%tmp7 = add i32 %start_arg, 1		; <i32> [#uses=1]
+	%tmp8 = call fastcc i32 @raise_load_1(i32* %a_arg, i32 %a_len_arg, i32 %tmp7)		; <i32> [#uses=1]
+	%tmp9 = load i32* %a_arg		; <i32> [#uses=1]
+	%tmp10 = add i32 %tmp9, %tmp8		; <i32> [#uses=1]
+	ret i32 %tmp10
+}
+
+
+; This load can be moved above the call because the function won't write to it
+; and the load provably can't trap.
+define fastcc i32 @raise_load_2(i32* %a_arg, i32 %a_len_arg, i32 %start_arg) readonly {
+entry:
+	%tmp2 = icmp sge i32 %start_arg, %a_len_arg		; <i1> [#uses=1]
+	br i1 %tmp2, label %if, label %else
+
+if:		; preds = %entry
+	ret i32 0
+
+else:		; preds = %entry
+	%nullcheck = icmp eq i32* %a_arg, null		; <i1> [#uses=1]
+	br i1 %nullcheck, label %unwind, label %recurse
+
+unwind:		; preds = %else
+	unwind
+
+recurse:		; preds = %else
+	%tmp7 = add i32 %start_arg, 1		; <i32> [#uses=1]
+	%tmp8 = call fastcc i32 @raise_load_2(i32* %a_arg, i32 %a_len_arg, i32 %tmp7)		; <i32> [#uses=1]
+	%tmp9 = load i32* @global		; <i32> [#uses=1]
+	%tmp10 = add i32 %tmp9, %tmp8		; <i32> [#uses=1]
+	ret i32 %tmp10
+}
+
+
+; This load can be safely moved above the call (even though it's from an
+; extern_weak global) because the call has no side effects.
+define fastcc i32 @raise_load_3(i32* %a_arg, i32 %a_len_arg, i32 %start_arg) nounwind readonly {
+entry:
+	%tmp2 = icmp sge i32 %start_arg, %a_len_arg		; <i1> [#uses=1]
+	br i1 %tmp2, label %if, label %else
+
+if:		; preds = %entry
+	ret i32 0
+
+else:		; preds = %entry
+	%tmp7 = add i32 %start_arg, 1		; <i32> [#uses=1]
+	%tmp8 = call fastcc i32 @raise_load_3(i32* %a_arg, i32 %a_len_arg, i32 %tmp7)		; <i32> [#uses=1]
+	%tmp9 = load i32* @extern_weak_global		; <i32> [#uses=1]
+	%tmp10 = add i32 %tmp9, %tmp8		; <i32> [#uses=1]
+	ret i32 %tmp10
+}
+
+
+; The second load can be safely moved above the call even though it's from an
+; unknown pointer (which normally means it might trap) because the first load
+; proves it doesn't trap.
+define fastcc i32 @raise_load_4(i32* %a_arg, i32 %a_len_arg, i32 %start_arg) readonly {
+entry:
+	%tmp2 = icmp sge i32 %start_arg, %a_len_arg		; <i1> [#uses=1]
+	br i1 %tmp2, label %if, label %else
+
+if:		; preds = %entry
+	ret i32 0
+
+else:		; preds = %entry
+	%nullcheck = icmp eq i32* %a_arg, null		; <i1> [#uses=1]
+	br i1 %nullcheck, label %unwind, label %recurse
+
+unwind:		; preds = %else
+	unwind
+
+recurse:		; preds = %else
+	%tmp7 = add i32 %start_arg, 1		; <i32> [#uses=1]
+	%first = load i32* %a_arg		; <i32> [#uses=1]
+	%tmp8 = call fastcc i32 @raise_load_4(i32* %a_arg, i32 %first, i32 %tmp7)		; <i32> [#uses=1]
+	%second = load i32* %a_arg		; <i32> [#uses=1]
+	%tmp10 = add i32 %second, %tmp8		; <i32> [#uses=1]
+	ret i32 %tmp10
+}