diff --git a/test/CodeGen/X86/fast-isel.ll b/test/CodeGen/X86/fast-isel.ll
new file mode 100644
index 0000000..36c5a2d
--- /dev/null
+++ b/test/CodeGen/X86/fast-isel.ll
@@ -0,0 +1,17 @@
+; RUN: llvm-as < %s | llc -fast-isel | grep add | count 1
+
+; This tests very minimal fast-isel functionality.
+
+define i32 @foo(i32* %p, i32* %q) {
+entry:
+  %r = load i32* %p
+  %s = load i32* %q
+  br label %fast
+
+fast:
+  %t = add i32 %r, %s
+  br label %exit
+
+exit:
+  ret i32 %t
+}