Add missing MMX PSUBQ.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43488 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 27685a8..ab24083 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -498,6 +498,7 @@
     setOperationAction(ISD::SUB,                MVT::v8i8,  Legal);
     setOperationAction(ISD::SUB,                MVT::v4i16, Legal);
     setOperationAction(ISD::SUB,                MVT::v2i32, Legal);
+    setOperationAction(ISD::SUB,                MVT::v1i64, Legal);
 
     setOperationAction(ISD::MULHS,              MVT::v4i16, Legal);
     setOperationAction(ISD::MUL,                MVT::v4i16, Legal);