llvm-project/llvm/test/MachineVerifier/test_g_phi.mir

#RUN: not llc -o - -global-isel -run-pass=none -verify-machineinstrs %s 2>&1 | FileCheck %s
# REQUIRES: global-isel, aarch64-registered-target
--- |
  ; ModuleID = 'test.ll'
  source_filename = "test.ll"
  target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
  target triple = "aarch64-unknown-unknown"
  
  define i32 @test_phi(i32 %argc) {
  entry:
    %cmp = icmp ugt i32 %argc, 0
    br i1 %cmp, label %case1, label %case2
  
  case1:                                            ; preds = %entry
    %tmp11 = add i32 %argc, 1
    br label %return
  
  case2:                                            ; preds = %entry
    %tmp22 = add i32 %argc, 2
    br label %return
  
  return:                                           ; preds = %case2, %case1
    %res = phi i32 [ %tmp11, %case1 ], [ %tmp22, %case2 ]
    ret i32 %res
  }

...
---
name:            test_phi
legalized:       true
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:       
  - { id: 0, class: _, preferred-register: '' }
  - { id: 1, class: _, preferred-register: '' }
  - { id: 2, class: _, preferred-register: '' }
  - { id: 3, class: _, preferred-register: '' }
  - { id: 4, class: _, preferred-register: '' }
  - { id: 5, class: _, preferred-register: '' }
  - { id: 6, class: _, preferred-register: '' }
  - { id: 7, class: _, preferred-register: '' }
  - { id: 8, class: _, preferred-register: '' }
  - { id: 9, class: _, preferred-register: '' }
liveins:         
body:             |
  bb.1.entry:
    successors: %bb.2.case1(0x40000000), %bb.3.case2(0x40000000)
    liveins: $w0
    ; This test makes sure that the Verifier catches G_PHI with mismatching types.
    ; CHECK: Bad machine code: Generic Instruction G_PHI has operands with incompatible/missing types
  
    %0(s32) = COPY $w0
    %1(s32) = G_CONSTANT i32 0
    %3(s32) = G_CONSTANT i32 1
    %5(s32) = G_CONSTANT i32 2
    %8(s32) = G_ICMP intpred(ugt), %0(s32), %1
    %2(s1) = G_TRUNC %8(s32)
    G_BRCOND %2(s1), %bb.2.case1
    G_BR %bb.3.case2
  
  bb.2.case1:
    successors: %bb.4.return(0x80000000)
  
    %4(s32) = G_ADD %0, %3
    %9(s16) = G_TRUNC %4(s32)
    G_BR %bb.4.return
  
  bb.3.case2:
    successors: %bb.4.return(0x80000000)
  
    %6(s32) = G_ADD %0, %5
  
  bb.4.return:
    %7(s32) = G_PHI %9(s16), %bb.2.case1, %6(s32), %bb.3.case2
    $w0 = COPY %7(s32)
    RET_ReallyLR implicit $w0

...