# RUN: llvm-mc --disassemble %s -triple=x86_64 2>&1 | FileCheck %s

## 15 redundant operand-size (0x66) prefixes + NOP = 16 bytes, over the limit.
# CHECK: warning: invalid instruction encoding
0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x90
