test/CodeGen/AMDGPU/fold-reload-into-m0.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-machineinstrs -stress-regalloc=2 -start-before=greedy -stop-after=virtregmap -o - %s | FileCheck %s

# Test that a spill of a copy of m0 is not folded to be a spill of m0 directly.

---

name:            merge_sgpr_spill_into_copy_from_m0
tracksRegLiveness: true
machineFunctionInfo:
  isEntryFunction: true
body:             |
  bb.0:

    ; CHECK-LABEL: name: merge_sgpr_spill_into_copy_from_m0
    ; CHECK: liveins: $vgpr0
    ; CHECK: S_NOP 0, implicit-def $m0
    ; CHECK: $sgpr0 = S_MOV_B32 $m0
    ; CHECK: $vgpr0 = V_WRITELANE_B32 killed $sgpr0, 0, $vgpr0
    ; CHECK: $sgpr0 = V_READLANE_B32 $vgpr0, 0
    ; CHECK: S_NOP 0, implicit-def dead renamable $sgpr1, implicit-def dead renamable $sgpr0, implicit killed renamable $sgpr0
    ; CHECK: $sgpr0 = V_READLANE_B32 $vgpr0, 0
    ; CHECK: $m0 = S_MOV_B32 killed $sgpr0
    ; CHECK: S_NOP 0
    ; CHECK: S_SENDMSG 0, implicit $m0, implicit $exec
    S_NOP 0, implicit-def $m0
    %0:sreg_32 = COPY $m0
    S_NOP 0, implicit-def %1:sreg_32, implicit-def %2:sreg_32, implicit %0
    $m0 = COPY %0
    S_SENDMSG 0, implicit $m0, implicit $exec

...

# Test that a reload into a copy of m0 is not folded to be a reload of m0 directly.

---

name:            reload_sgpr_spill_into_copy_to_m0
tracksRegLiveness: true
machineFunctionInfo:
  isEntryFunction: true
body:             |
  bb.0:

    ; CHECK-LABEL: name: reload_sgpr_spill_into_copy_to_m0
    ; CHECK: liveins: $vgpr0
    ; CHECK: S_NOP 0, implicit-def renamable $sgpr0, implicit-def dead renamable $sgpr1, implicit-def $m0
    ; CHECK: $vgpr0 = V_WRITELANE_B32 killed $sgpr0, 0, $vgpr0
    ; CHECK: $sgpr0 = V_READLANE_B32 $vgpr0, 0
    ; CHECK: S_NOP 0, implicit killed renamable $sgpr0, implicit-def dead renamable $sgpr1, implicit-def dead renamable $sgpr0
    ; CHECK: $sgpr0 = V_READLANE_B32 $vgpr0, 0
    ; CHECK: $m0 = S_MOV_B32 killed $sgpr0
    ; CHECK: S_NOP 0
    ; CHECK: S_SENDMSG 0, implicit $m0, implicit $exec
    S_NOP 0, implicit-def %0:sreg_32, implicit-def %1:sreg_32, implicit-def $m0
    S_NOP 0, implicit %0, implicit-def %3:sreg_32, implicit-def %4:sreg_32
    $m0 = COPY %0
    S_SENDMSG 0, implicit $m0, implicit $exec

...