# RUN: llc -march=mips -mcpu=mips32r6 -mattr=+micromips %s -start-after=xray-instrumentation -o - -show-mc-encoding | FileCheck %s

# Test that the 'sll $zero, $zero, 0' is correctly recognized as a real
# instruction rather than some unimplemented opcode for the purposes of
# encoding an instruction.

# CHECK-LABEL: a:
# CHECK:  nop                           # encoding: [0x00,0x00,0x00,0x00]
# CHECK:  jrc   $ra                     # encoding: [0x45,0xbf]
---
name:            a
alignment:       2
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
tracksRegLiveness: false
registers:
liveins:
  - { reg: '%a0', virtual-reg: '' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    1
  adjustsStack:    false
  hasCalls:        false
  stackProtector:  ''
  maxCallFrameSize: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  savePoint:       ''
  restorePoint:    ''
fixedStack:
stack:
constants:
body:             |
  bb.0.entry:
    renamable %zero = SLL_MMR6 killed renamable %zero, 0
    JRC16_MM undef %ra, implicit %v0

...