--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/MC/X86/x86_errors.s	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,33 @@
+// RUN: not llvm-mc -triple x86_64-unknown-unknown %s 2> %t.err
+// RUN: FileCheck --check-prefix=64 < %t.err %s
+
+// RUN: not llvm-mc -triple i386-unknown-unknown %s 2> %t.err
+// RUN: FileCheck --check-prefix=32 < %t.err %s
+// rdar://8204588
+
+// 64: error: ambiguous instructions require an explicit suffix (could be 'cmpb', 'cmpw', 'cmpl', or 'cmpq')
+cmp $0, 0(%eax)
+
+// 32: error: register %rax is only available in 64-bit mode
+addl $0, 0(%rax)
+
+// 32: test.s:8:2: error: invalid instruction mnemonic 'movi'
+
+# 8 "test.s"
+ movi $8,%eax
+
+movl 0(%rax), 0(%edx)  // error: invalid operand for instruction
+
+// 32: error: instruction requires: 64-bit mode
+sysexitq
+
+// rdar://10710167
+// 64: error: expected scale expression
+lea (%rsp, %rbp, $4), %rax
+
+// rdar://10423777
+// 64: error: index register is 32-bit, but base register is 64-bit
+movq (%rsi,%ecx),%xmm0
+
+// 32: error: invalid operand for instruction
+outb al, 4