test/MC/ARM/obsolete-v8.s - external/github.com/emscripten-core/emscripten-fastcomp - Git at Google

 @ RUN: not llvm-mc -triple=armv8 < %s 2>&1 | FileCheck %s

 swp r0, r1, [r2]
 @ CHECK: instruction requires: armv7 or earlier

 swpb r0, r1, [r2]
 @ CHECK: instruction requires: armv7 or earlier
	@ RUN: not llvm-mc -triple=armv8 < %s 2>&1 \| FileCheck %s

	swp r0, r1, [r2]
	@ CHECK: instruction requires: armv7 or earlier

	swpb r0, r1, [r2]
	@ CHECK: instruction requires: armv7 or earlier