-@ RUN: llvm-mc -show-encoding -arch=arm < %s 2>&1 | FileCheck %s --check-prefix=CHECK-ARM-ONLY
+@ RUN: not llvm-mc -show-encoding -arch=arm < %s 2>&1 | FileCheck %s --check-prefix=CHECK-ARM-ONLY
@ RUN: llvm-mc -show-encoding -triple=armv4t < %s 2>&1| FileCheck %s --check-prefix=CHECK-ARM-THUMB
@ RUN: llvm-mc -show-encoding -arch=arm -mcpu=cortex-a15 < %s 2>&1| FileCheck %s --check-prefix=CHECK-ARM-THUMB
-@ RUN: llvm-mc -show-encoding -arch=arm -mcpu=cortex-m3 < %s 2>&1 | FileCheck %s --check-prefix=CHECK-THUMB-ONLY
-@ RUN: llvm-mc -show-encoding -triple=armv7m < %s 2>&1 | FileCheck %s --check-prefix=CHECK-THUMB-ONLY
-@ RUN: llvm-mc -show-encoding -triple=armv6m < %s 2>&1 | FileCheck %s --check-prefix=CHECK-THUMB-ONLY
+@ RUN: not llvm-mc -show-encoding -arch=arm -mcpu=cortex-m3 < %s 2>&1 | FileCheck %s --check-prefix=CHECK-THUMB-ONLY
+@ RUN: not llvm-mc -show-encoding -triple=armv7m < %s 2>&1 | FileCheck %s --check-prefix=CHECK-THUMB-ONLY
+@ RUN: not llvm-mc -show-encoding -triple=armv6m < %s 2>&1 | FileCheck %s --check-prefix=CHECK-THUMB-ONLY
@ Make sure correct diagnostics are given for CPUs without support for
@ one or other of the execution states.