diff --git a/test/CodeGen/X86/2006-05-08-CoalesceSubRegClass.ll b/test/CodeGen/X86/2006-05-08-CoalesceSubRegClass.ll
new file mode 100644
index 00000000000..35efceed7c1
--- /dev/null
+++ b/test/CodeGen/X86/2006-05-08-CoalesceSubRegClass.ll
@@ -0,0 +1,22 @@
+; Coalescing from R32 to a subset R32_. Once another register coalescer bug is
+; fixed, the movb should go away as well.
+
+; RUN: llvm-as < %s | llc -march=x86 -relocation-model=static | grep 'movl' | wc -l
+
+%B = external global uint
+%C = external global ushort*
+
+void %test(uint %A) {
+	%A = cast uint %A to ubyte
+	%tmp2 = load uint* %B
+	%tmp3 = and ubyte %A, 16
+	%tmp4 = shl uint %tmp2, ubyte %tmp3
+	store uint %tmp4, uint* %B
+	%tmp6 = shr uint %A, ubyte 3
+	%tmp = load ushort** %C
+	%tmp8 = cast ushort* %tmp to uint
+	%tmp9 = add uint %tmp8, %tmp6
+	%tmp9 = cast uint %tmp9 to ushort*
+	store ushort* %tmp9, ushort** %C
+	ret void
+}