test/tools/llvm-reduce/mir/preserve-reg-hints.mir

# REQUIRES: amdgpu-registered-target
# RUN: llvm-reduce -abort-on-invalid-reduction -mtriple=amdgcn-amd-amdhsa --delta-passes=instructions --test FileCheck --test-arg --check-prefix=CHECK-INTERESTINGNESS --test-arg %s --test-arg --input-file %s -o %t 2> %t.log
# RUN: FileCheck --match-full-lines --check-prefix=RESULT %s < %t

# CHECK-INTERESTINGNESS: S_NOP 0

# Make sure that register hints are preserved in the cloned function.

# RESULT: registers:
# RESULT-NEXT: - { id: 0, class: vgpr_32, preferred-register: '$vgpr0' }
# RESULT-NEXT: - { id: 1, class: vgpr_32, preferred-register: '' }
# RESULT-NEXT: - { id: 2, class: vgpr_32, preferred-register: '%1' }
# RESULT-NEXT: - { id: 3, class: vgpr_32, preferred-register: '%4' }
# RESULT-NEXT: - { id: 4, class: vgpr_32, preferred-register: '%3' }
---
name: register_hints
tracksRegLiveness: true
registers:
  - { id: 0, class: vgpr_32, preferred-register: '$vgpr0' }
  - { id: 1, class: vgpr_32, preferred-register: '' }
  - { id: 2, class: vgpr_32, preferred-register: '%1' }
  - { id: 3, class: vgpr_32, preferred-register: '%4' }
  - { id: 4, class: vgpr_32, preferred-register: '%3' }
body:             |
  bb.0:
    %0:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
    %1:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
    %2:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
    %3:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
    %4:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
    S_NOP 0
    S_ENDPGM 0, implicit %0, implicit %1, implicit %2, implicit %3, implicit %4

...