diff --git a/test/CodeGen/X86/dyn-stackalloc.ll b/test/CodeGen/X86/dyn-stackalloc.ll
new file mode 100644
index 00000000000..12cd754a662
--- /dev/null
+++ b/test/CodeGen/X86/dyn-stackalloc.ll
@@ -0,0 +1,16 @@
+; RUN: llvm-as < %s | llc -march=x86 | not grep 4294967289
+; RUN: llvm-as < %s | llc -march=x86 | grep 4294967280
+; RUN: llvm-as < %s | llc -march=x86-64 | grep {\\-16}
+
+define void @t() {
+A:
+	br label %entry
+
+entry:
+	%m1 = alloca i32, align 4
+	%m2 = alloca [7 x i8], align 16
+	call void @s( i32* %m1, [7 x i8]* %m2 )
+	ret void
+}
+
+declare void @s(i32*, [7 x i8]*)