test/CodeGen/MIR/AMDGPU/parse-order-reserved-regs.mir

# RUN: llc -mtriple=amdgcn -run-pass=none -verify-machineinstrs -o - %s | FileCheck %s
# RUN: llc -mtriple=amdgcn  -run-pass mir-canonicalizer -verify-machineinstrs -o - %s
# RUN: llc -mtriple=amdgcn  -run-pass mir-canonicalizer -mir-vreg-namer-use-stable-hash -verify-machineinstrs -o - %s

# Previously getReservedRegs was called before parsing
# machineFunctionInfo, but the AMDGPU implementation depends on
# setting register fields to reserve there. $sgpr50 would then not be
# reserved, resulting in a verifier error from an undefined register.

---
# CHECK: machineFunctionInfo:
# CHECK: isEntryFunction: true
# CHECK: scratchRSrcReg:  '$sgpr0_sgpr1_sgpr2_sgpr3'
# CHECK: frameOffsetReg:  '$sgpr50'
# CHECK: renamable $vgpr0 = BUFFER_LOAD_DWORD_OFFEN %stack.0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr50, 4, 0, 0, implicit $exec :: (load (s32), addrspace 5)
name: reserve_correct_register
tracksRegLiveness: true
machineFunctionInfo:
  isEntryFunction: true
  scratchRSrcReg:  '$sgpr0_sgpr1_sgpr2_sgpr3'
  frameOffsetReg:  '$sgpr50'
stack:
  - { id: 0, type: default, offset: 0, size: 4, alignment: 4 }

body:             |
  bb.0:
    renamable $vgpr0 = BUFFER_LOAD_DWORD_OFFEN %stack.0, $sgpr0_sgpr1_sgpr2_sgpr3, $sgpr50, 4, 0, 0, implicit $exec :: (load (s32), addrspace 5)
    S_ENDPGM 0
...