diff --git a/test/CodeGen/X86/2006-07-31-SingleRegClass.ll b/test/CodeGen/X86/2006-07-31-SingleRegClass.ll
new file mode 100644
index 00000000000..92eb1cbb8e5
--- /dev/null
+++ b/test/CodeGen/X86/2006-07-31-SingleRegClass.ll
@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | llc -march=x86 -x86-asm-syntax=att | grep 'movl 4(%eax),%ebp' &&
+; RUN: llvm-as < %s | llc -march=x86 -x86-asm-syntax=att | grep 'movl 0(%eax), %ebx'
+
+; PR850
+
+int %foo(int %__s.i.i, int %tmp5.i.i, int %tmp6.i.i, int %tmp7.i.i, int %tmp8.i.i ) {
+
+%tmp9.i.i = call int asm sideeffect "push %ebp\0Apush %ebx\0Amovl 4($2),%ebp\0Amovl 0($2), %ebx\0Amovl $1,%eax\0Aint  $$0x80\0Apop  %ebx\0Apop %ebp", "={ax},i,0,{cx},{dx},{si},{di}"(int 192, int %__s.i.i, int %tmp5.i.i, int %tmp6.i.i, int %tmp7.i.i, int %tmp8.i.i )
+  ret int %tmp9.i.i
+}