1*9880d681SAndroid Build Coastguard Worker// RUN: not llvm-mc -triple x86_64-unknown-unknown --show-encoding %s 2>&1 | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker// CHECK: LLVM ERROR: Cannot encode high byte register in REX-prefixed instruction 3*9880d681SAndroid Build Coastguard Worker movzx %dh, %rsi 4