src/llvm-project/llvm/test/CodeGen/AMDGPU/sched-barrier-hang-weak-dep.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -march=amdgcn -mcpu=gfx908 -run-pass=machine-scheduler -verify-misched -o - %s | FileCheck %s

# This would hang after removing edges from the SCHED_BARRIER since the number
# of Preds/Succs would be left in an inconsistent state.

---
name: sched_barrier_cluster_dep_hang
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: sched_barrier_cluster_dep_hang
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:sreg_64 = IMPLICIT_DEF
  ; CHECK-NEXT:   [[DEF1:%[0-9]+]]:vgpr_32 = IMPLICIT_DEF
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   SCHED_BARRIER 128
  ; CHECK-NEXT:   [[GLOBAL_LOAD_DWORD_SADDR:%[0-9]+]]:vgpr_32 = GLOBAL_LOAD_DWORD_SADDR [[DEF]], [[DEF1]], 512, 0, implicit $exec :: (load (s32))
  ; CHECK-NEXT:   [[GLOBAL_LOAD_DWORD_SADDR1:%[0-9]+]]:vgpr_32 = GLOBAL_LOAD_DWORD_SADDR [[DEF]], [[DEF1]], 0, 0, implicit $exec :: (load (s32))
  ; CHECK-NEXT:   SCHED_BARRIER 128
  ; CHECK-NEXT:   [[V_MUL_LO_U32_e64_:%[0-9]+]]:vgpr_32 = nsw V_MUL_LO_U32_e64 [[GLOBAL_LOAD_DWORD_SADDR]], [[GLOBAL_LOAD_DWORD_SADDR]], implicit $exec
  ; CHECK-NEXT:   [[V_MUL_LO_U32_e64_1:%[0-9]+]]:vgpr_32 = nsw V_MUL_LO_U32_e64 [[GLOBAL_LOAD_DWORD_SADDR1]], [[GLOBAL_LOAD_DWORD_SADDR1]], implicit $exec
  ; CHECK-NEXT:   GLOBAL_STORE_DWORD_SADDR [[DEF1]], [[V_MUL_LO_U32_e64_]], [[DEF]], 512, 0, implicit $exec :: (store (s32))
  ; CHECK-NEXT:   GLOBAL_STORE_DWORD_SADDR [[DEF1]], [[V_MUL_LO_U32_e64_1]], [[DEF]], 0, 0, implicit $exec :: (store (s32))
  ; CHECK-NEXT:   S_ENDPGM 0
  bb.0:
    %0:sreg_64 = IMPLICIT_DEF
    %1:vgpr_32 = IMPLICIT_DEF

  bb.1:
    SCHED_BARRIER 128
    %3:vgpr_32 = GLOBAL_LOAD_DWORD_SADDR %0, %1, 0, 0, implicit $exec :: (load (s32))
    %5:vgpr_32 = GLOBAL_LOAD_DWORD_SADDR %0, %1, 512, 0, implicit $exec :: (load (s32))
    SCHED_BARRIER 128
    %6:vgpr_32 = nsw V_MUL_LO_U32_e64 %5, %5, implicit $exec
    %4:vgpr_32 = nsw V_MUL_LO_U32_e64 %3, %3, implicit $exec
    GLOBAL_STORE_DWORD_SADDR %1, %6, %0, 512, 0, implicit $exec :: (store (s32))
    GLOBAL_STORE_DWORD_SADDR %1, %4, %0, 0, 0, implicit $exec :: (store (s32))
    S_ENDPGM 0
...