llvm/test/CodeGen/AMDGPU/remat-physreg-copy-subreg-extract-already-live-at-def-issue120970.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -run-pass=register-coalescer -o - %s | FileCheck %s

# This used to assert due to trying to rematerialize V_MOV_B64_PSEUDO
# at copy to $vgpr1. This would assert since this would clobber the
# live value in $vgpr0.

---
name: rematerialize_physreg_sub_def_already_live_at_def_assert
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; CHECK-LABEL: name: rematerialize_physreg_sub_def_already_live_at_def_assert
    ; CHECK: liveins: $vgpr0
    ; CHECK-NEXT: {{  $}}
    ; CHECK-NEXT: [[V_MOV_B:%[0-9]+]]:vreg_64 = V_MOV_B64_PSEUDO 1, implicit $exec
    ; CHECK-NEXT: $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    ; CHECK-NEXT: $vgpr1 = COPY [[V_MOV_B]].sub1
    ; CHECK-NEXT: SI_RETURN implicit $vgpr0, implicit killed $vgpr1
    %0:vreg_64 = V_MOV_B64_PSEUDO 1, implicit $exec
    %1:vgpr_32 = COPY %0.sub1
    $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    $vgpr1 = COPY %1
    SI_RETURN implicit $vgpr0, implicit killed $vgpr1
...

# Same as previous, except with an IMPLICIT_DEF
---
name: rematerialize_physreg_sub_def_already_live_at_def_assert_implicit_def
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; CHECK-LABEL: name: rematerialize_physreg_sub_def_already_live_at_def_assert_implicit_def
    ; CHECK: liveins: $vgpr0
    ; CHECK-NEXT: {{  $}}
    ; CHECK-NEXT: [[DEF:%[0-9]+]]:vreg_64 = IMPLICIT_DEF
    ; CHECK-NEXT: $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    ; CHECK-NEXT: $vgpr1 = COPY [[DEF]].sub1
    ; CHECK-NEXT: SI_RETURN implicit $vgpr0, implicit killed $vgpr1
    %0:vreg_64 = IMPLICIT_DEF
    %1:vgpr_32 = COPY %0.sub1
    $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    $vgpr1 = COPY %1
    SI_RETURN implicit $vgpr0, implicit killed $vgpr1
...

---
name: rematerialize_physreg_sub_def_no_live_sub_def_0
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; CHECK-LABEL: name: rematerialize_physreg_sub_def_no_live_sub_def_0
    ; CHECK: liveins: $vgpr0
    ; CHECK-NEXT: {{  $}}
    ; CHECK-NEXT: dead $vgpr0_vgpr1 = V_MOV_B64_PSEUDO 1, implicit $exec, implicit-def $vgpr1
    ; CHECK-NEXT: SI_RETURN implicit killed $vgpr1
    %0:vreg_64 = V_MOV_B64_PSEUDO 1, implicit $exec
    %1:vgpr_32 = COPY %0.sub1
    $vgpr1 = COPY %1
    SI_RETURN implicit killed $vgpr1
...

---
name: rematerialize_physreg_sub_def_no_live_sub_def_1
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; CHECK-LABEL: name: rematerialize_physreg_sub_def_no_live_sub_def_1
    ; CHECK: liveins: $vgpr0
    ; CHECK-NEXT: {{  $}}
    ; CHECK-NEXT: dead $vgpr1_vgpr2 = V_MOV_B64_PSEUDO 1, implicit $exec, implicit-def $vgpr1
    ; CHECK-NEXT: SI_RETURN implicit killed $vgpr1
    %0:vreg_64 = V_MOV_B64_PSEUDO 1, implicit $exec
    %1:vgpr_32 = COPY %0.sub0
    $vgpr1 = COPY %1
    SI_RETURN implicit killed $vgpr1
...