llvm/llvm/test/CodeGen/AArch64/GlobalISel/select-phi.mir

# RUN: llc -mtriple=aarch64-unknown-unknown -o - -verify-machineinstrs -run-pass=instruction-select -global-isel-abort=1 %s | FileCheck %s
--- |
  ; ModuleID = '/tmp/test.ll'
  source_filename = "/tmp/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
    %tmp1 = add i32 %argc, 1
    br label %return

  case2:                                            ; preds = %entry
    %tmp2 = add i32 %argc, 2
    br label %return

  return:                                           ; preds = %case2, %case1
    %res = phi i32 [ %tmp1, %case1 ], [ %tmp2, %case2 ]
    ret i32 %res
  }

  define ptr @test_phi_ptr(ptr %a, ptr %b, i1 %cond) {
  entry:
    ret ptr null
  }

...
---
name:            test_phi
alignment:       4
exposesReturnsTwice: false
legalized:       true
regBankSelected: true
selected:        false
tracksRegLiveness: true
registers:
  - { id: 0, class: gpr, preferred-register: '' }
  - { id: 1, class: gpr, preferred-register: '' }
  - { id: 2, class: gpr, preferred-register: '' }
  - { id: 3, class: gpr, preferred-register: '' }
  - { id: 4, class: gpr, preferred-register: '' }
  - { id: 5, class: gpr, preferred-register: '' }
  - { id: 6, class: gpr, preferred-register: '' }
  - { id: 7, class: gpr, preferred-register: '' }
  - { id: 8, class: gpr, preferred-register: '' }
liveins:
body:             |
  bb.1.entry:
    successors: %bb.2.case1(0x40000000), %bb.3.case2(0x40000000)
    liveins: $w0
    ; CHECK-LABEL: name: test_phi
    ; CHECK: [[RES:%.*]]:gpr32 = PHI

    %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
    G_BRCOND %8, %bb.2.case1
    G_BR %bb.3.case2

  bb.2.case1:
    successors: %bb.4.return(0x80000000)

    %4(s32) = G_ADD %0, %3
    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 %4(s32), %bb.2.case1, %6(s32), %bb.3.case2
    $w0 = COPY %7(s32)
    RET_ReallyLR implicit $w0

...

---
name:            test_phi_ptr
alignment:       4
exposesReturnsTwice: false
legalized:       true
regBankSelected: true
selected:        false
tracksRegLiveness: true
registers:
  - { id: 0, class: gpr, preferred-register: '' }
  - { id: 1, class: gpr, preferred-register: '' }
  - { id: 2, class: gpr, preferred-register: '' }
  - { id: 3, class: gpr, preferred-register: '' }
  - { id: 4, class: _, preferred-register: '' }
  - { id: 5, class: _, preferred-register: '' }
liveins:
body:             |
  bb.0:
    successors: %bb.1, %bb.2
    liveins: $w2, $x0, $x1
    ; CHECK-LABEL: name: test_phi_ptr

    %0(p0) = COPY $x0
    %1(p0) = COPY $x1
    %2:gpr(s32) = COPY $w2
    G_BRCOND %2, %bb.1
    G_BR %bb.2

  bb.1:
    successors: %bb.2


  bb.2:
    ; CHECK: %{{[0-9]+}}:gpr64 = PHI %{{[0-9]+}}, %bb.0, %{{[0-9]+}}, %bb.1
    %3(p0) = G_PHI %0(p0), %bb.0, %1(p0), %bb.1
    $x0 = COPY %3(p0)
    RET_ReallyLR implicit $x0

...