src/llvm-project/llvm/test/Analysis/DotMachineCFG/AMDGPU/irreducible.mir

# RUN: llc -mtriple=amdgcn-- -run-pass=dot-machine-cfg  -mcfg-dot-filename-prefix=%t -o -  %s 2>&1 > /dev/null
# RUN: FileCheck %s -input-file=%t.irreducible.dot --check-prefix=MCFG
# RUN: llc -mtriple=amdgcn-- -run-pass=dot-machine-cfg  -mcfg-dot-filename-prefix=%t -dot-mcfg-only -o -  %s 2>&1 > /dev/null
# RUN: FileCheck %s -input-file=%t.irreducible.dot --check-prefix=MCFG-ONLY

# MCFG: digraph "Machine CFG for 'irreducible' function"
# MCFG-NEXT: label="Machine CFG for 'irreducible' function"
# MCFG: Node{{[0-9A-Za-z]*}} [shape=record,label="{bb.0:\l| successors: %bb.1(0x40000000), %bb.2(0x40000000)\l  liveins: $vgpr0, $vgpr1, $vgpr2, $sgpr4_sgpr5, $sgpr6_sgpr7, $sgpr8_sgpr9,\l... $sgpr10_sgpr11, $sgpr14, $sgpr15, $sgpr16\l  %0:sreg_32 = IMPLICIT_DEF\l  %1:vgpr_32 = COPY $vgpr0\l  %2:vgpr_32 = V_MOV_B32_e32 0, implicit $exec\l  S_CMP_EQ_U32 %0:sreg_32, 0, implicit-def $scc\l  S_CBRANCH_SCC1 %bb.1, implicit $scc\l  S_BRANCH %bb.2\l}"];
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{bb.1:\l|\l successors: %bb.3(0x80000000)\l\l  %3:vgpr_32 = PHI %2:vgpr_32, %bb.0, %4:vgpr_32, %bb.5\l  %5:vgpr_32 = V_ADD_U32_e64 %3:vgpr_32, 1, 0, implicit $exec\l  S_BRANCH %bb.3\l}"];
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{bb.2:\l|\l successors: %bb.3(0x80000000)\l\l  %6:vgpr_32 = PHI %2:vgpr_32, %bb.0, %4:vgpr_32, %bb.4\l  %7:vgpr_32 = V_ADD_U32_e64 %6:vgpr_32, 2, 0, implicit $exec\l}"];
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{bb.3:\l|\l successors: %bb.4(0x80000000)\l\l  %4:vgpr_32 = PHI %5:vgpr_32, %bb.1, %7:vgpr_32, %bb.2\l}"];
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{bb.4:\l|\l successors: %bb.2(0x40000000), %bb.5(0x40000000)\l\l  %8:vgpr_32 = V_AND_B32_e32 3, %1:vgpr_32, implicit $exec\l  %9:sreg_64 = V_CMP_EQ_U32_e64 %8:vgpr_32, 2, implicit $exec\l  %10:sreg_64 = SI_IF killed %9:sreg_64, %bb.2, implicit-def dead $exec,\l... implicit-def dead $scc, implicit $exec\l}"];
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{bb.5:\l|\l successors: %bb.1(0x40000000), %bb.6(0x40000000)\l\l  %11:sreg_64 = V_CMP_EQ_U32_e64 %8:vgpr_32, 1, implicit $exec\l  %12:sreg_64 = SI_IF killed %11:sreg_64, %bb.1, implicit-def dead $exec,\l... implicit-def dead $scc, implicit $exec\l}"];
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{bb.6:\l|\l\l S_ENDPGM 0\l}"];

# MCFG-ONLY: digraph "Machine CFG for 'irreducible' function"
# MCFG-ONLY-NEXT: label="Machine CFG for 'irreducible' function"
# MCFG-ONLY: Node{{[0-9A-Za-z]*}} [shape=record,label="{%bb.0}"];
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{%bb.1}"];
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{%bb.2}"];
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{%bb.3}"];
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{%bb.4}"];
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{%bb.5}"];
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} -> Node{{[0-9A-Za-z]*}};
# MCFG-ONLY-NEXT: Node{{[0-9A-Za-z]*}} [shape=record,label="{%bb.6}"];
---
name:            irreducible
tracksRegLiveness: true
machineFunctionInfo:
  isEntryFunction: true
body:             |
  bb.0:
    successors: %bb.1, %bb.2
    liveins: $vgpr0, $vgpr1, $vgpr2, $sgpr4_sgpr5, $sgpr6_sgpr7, $sgpr8_sgpr9, $sgpr10_sgpr11, $sgpr14, $sgpr15, $sgpr16

    %0:sreg_32 = IMPLICIT_DEF
    %2:vgpr_32 = COPY $vgpr0
    %3:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
    S_CMP_EQ_U32 %0, 0, implicit-def $scc
    S_CBRANCH_SCC1 %bb.1, implicit $scc
    S_BRANCH %bb.2

  bb.1:
    %28:vgpr_32 = PHI %3, %bb.0, %49, %bb.5
    %29:vgpr_32 = V_ADD_U32_e64 %28, 1, 0, implicit $exec
    S_BRANCH %bb.3

  bb.2:
    %38:vgpr_32 = PHI %3, %bb.0, %49, %bb.4
    %39:vgpr_32 = V_ADD_U32_e64 %38, 2, 0, implicit $exec

  bb.3:
    %49:vgpr_32 = PHI %29, %bb.1, %39, %bb.2

  bb.4:
    successors: %bb.2, %bb.5

    %50:vgpr_32 = V_AND_B32_e32 3, %2, implicit $exec
    %51:sreg_64 = V_CMP_EQ_U32_e64 %50, 2, implicit $exec
    %52:sreg_64 = SI_IF killed %51:sreg_64, %bb.2, implicit-def dead $exec, implicit-def dead $scc, implicit $exec

  bb.5:
    successors: %bb.1, %bb.6
    %61:sreg_64 = V_CMP_EQ_U32_e64 %50, 1, implicit $exec
    %62:sreg_64 = SI_IF killed %61:sreg_64, %bb.1, implicit-def dead $exec, implicit-def dead $scc, implicit $exec

  bb.6:
    S_ENDPGM 0
...