| // RUN: llvm-mc -triple aarch64-none-linux-gnu -show-encoding -mattr=+v8.2a < %s | FileCheck %s | |
| // RUN: not llvm-mc -triple aarch64-none-linux-gnu -show-encoding -mattr=-v8.2a < %s 2>&1 | FileCheck %s --check-prefix=ERROR | |
| mrs x3, id_aa64mmfr2_el1 | |
| // CHECK: mrs x3, ID_AA64MMFR2_EL1 // encoding: [0x43,0x07,0x38,0xd5] | |
| // ERROR: error: expected readable system register |