Index: lib/Target/PowerPC/PPCISelLowering.cpp
===================================================================
--- lib/Target/PowerPC/PPCISelLowering.cpp
+++ lib/Target/PowerPC/PPCISelLowering.cpp
@@ -13084,6 +13084,9 @@
       return std::make_pair(0U, &PPC::VSSRCRegClass);
     else
       return std::make_pair(0U, &PPC::VSFRCRegClass);
+  } else if (Constraint == "{xer}") {
+    // The only interesting bit of XER is CARRY.
+    return std::make_pair(PPC::CARRY, &PPC::CARRYRCRegClass);
   }
 
   std::pair<unsigned, const TargetRegisterClass *> R =