test/CodeGen/AArch64/GlobalISel/legalize-phi.mir

# RUN: llc -mtriple=aarch64-unknown-unknown -verify-machineinstrs -run-pass=legalizer %s -o - | 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 @legalize_phi(i32 %argc) {
  entry:
    ret i32 0
  }

  define i64* @legalize_phi_ptr(i64* %a, i64* %b, i1 %cond) {
  entry:
    ret i64* null
  }

  define i32 @legalize_phi_empty(i32 %argc) {
  entry:
    ret i32 0
  }

  define i32 @legalize_phi_loop(i32 %argc) {
  entry:
    ret i32 0
  }

  define i32 @legalize_phi_cycle(i32 %argc) {
  entry:
    ret i32 0
  }
  define i32 @legalize_phi_same_bb(i32 %argc) {
  entry:
    ret i32 0
  }

  define i32 @legalize_phi_diff_bb(i32 %argc, i32 %argc2) {
  entry:
    ret i32 0
  }

...
---
name:            legalize_phi
alignment:       2
exposesReturnsTwice: false
legalized:       false
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: '' }
  - { id: 10, class: _, preferred-register: '' }
liveins:
body:             |
  ; CHECK-LABEL: name: legalize_phi
  ; CHECK: bb.0:
  ; CHECK:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK:   liveins: $w0
  ; CHECK:   [[COPY:%[0-9]+]]:_(s32) = COPY $w0
  ; CHECK:   [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
  ; CHECK:   [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
  ; CHECK:   [[C2:%[0-9]+]]:_(s32) = G_CONSTANT i32 2
  ; CHECK:   [[ICMP:%[0-9]+]]:_(s32) = G_ICMP intpred(ugt), [[COPY]](s32), [[C]]
  ; CHECK:   [[TRUNC:%[0-9]+]]:_(s1) = G_TRUNC [[ICMP]](s32)
  ; CHECK:   G_BRCOND [[TRUNC]](s1), %bb.1
  ; CHECK:   G_BR %bb.2
  ; CHECK: bb.1:
  ; CHECK:   successors: %bb.3(0x80000000)
  ; CHECK:   [[ADD:%[0-9]+]]:_(s32) = G_ADD [[COPY]], [[C1]]
  ; CHECK:   [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[ADD]](s32)
  ; CHECK:   G_BR %bb.3
  ; CHECK: bb.2:
  ; CHECK:   successors: %bb.3(0x80000000)
  ; CHECK:   [[ADD1:%[0-9]+]]:_(s32) = G_ADD [[COPY]], [[C2]]
  ; CHECK:   [[TRUNC2:%[0-9]+]]:_(s16) = G_TRUNC [[ADD1]](s32)
  ; CHECK: bb.3:
  ; CHECK:   [[PHI:%[0-9]+]]:_(s16) = G_PHI [[TRUNC1]](s16), %bb.1, [[TRUNC2]](s16), %bb.2
  ; CHECK:   [[C3:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
  ; CHECK:   [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT [[PHI]](s16)
  ; CHECK:   [[AND:%[0-9]+]]:_(s32) = G_AND [[ANYEXT]], [[C3]]
  ; CHECK:   $w0 = COPY [[AND]](s32)
  ; CHECK:   RET_ReallyLR implicit $w0
  bb.0:
   ; Test that we insert legalization artifacts(Truncs here) into the correct BBs
   ; while legalizing the G_PHI to s16.


    successors: %bb.1(0x40000000), %bb.2(0x40000000)
    liveins: $w0

    %0(s32) = COPY $w0
    %1(s32) = G_CONSTANT i32 0
    %3(s32) = G_CONSTANT i32 1
    %6(s32) = G_CONSTANT i32 2
    %2(s1) = G_ICMP intpred(ugt), %0(s32), %1
    G_BRCOND %2(s1), %bb.1
    G_BR %bb.2

  bb.1:
    successors: %bb.3(0x80000000)

    %4(s32) = G_ADD %0, %3
    %5(s1) = G_TRUNC %4(s32)
    G_BR %bb.3

  bb.2:
    successors: %bb.3(0x80000000)

    %7(s32) = G_ADD %0, %6
    %8(s1) = G_TRUNC %7(s32)

  bb.3:
    %9(s1) = G_PHI %5(s1), %bb.1, %8(s1), %bb.2
    %11:_(s1) = G_PHI %5(s1), %bb.1, %8(s1), %bb.2
    %10(s32) = G_ZEXT %9(s1)
    $w0 = COPY %10(s32)
    RET_ReallyLR implicit $w0

...
---
name:            legalize_phi_ptr
alignment:       2
exposesReturnsTwice: false
legalized:       false
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: '' }
liveins:
body:             |
  ; CHECK-LABEL: name: legalize_phi_ptr
  ; CHECK: bb.0:
  ; CHECK:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK:   liveins: $w2, $x0, $x1
  ; CHECK:   [[COPY:%[0-9]+]]:_(p0) = COPY $x0
  ; CHECK:   [[COPY1:%[0-9]+]]:_(p0) = COPY $x1
  ; CHECK:   [[COPY2:%[0-9]+]]:_(s32) = COPY $w2
  ; CHECK:   [[TRUNC:%[0-9]+]]:_(s1) = G_TRUNC [[COPY2]](s32)
  ; CHECK:   G_BRCOND [[TRUNC]](s1), %bb.1
  ; CHECK:   G_BR %bb.2
  ; CHECK: bb.1:
  ; CHECK:   successors: %bb.2(0x80000000)
  ; CHECK: bb.2:
  ; CHECK:   [[PHI:%[0-9]+]]:_(p0) = G_PHI [[COPY]](p0), %bb.0, [[COPY1]](p0), %bb.1
  ; CHECK:   $x0 = COPY [[PHI]](p0)
  ; CHECK:   RET_ReallyLR implicit $x0
  bb.1:

    successors: %bb.2, %bb.3
    liveins: $w2, $x0, $x1

    %0(p0) = COPY $x0
    %1(p0) = COPY $x1
    %4(s32) = COPY $w2
    %2(s1) = G_TRUNC %4(s32)
    G_BRCOND %2(s1), %bb.2
    G_BR %bb.3

  bb.2:
    successors: %bb.3

  bb.3:
    %3(p0) = G_PHI %0(p0), %bb.1, %1(p0), %bb.2
    $x0 = COPY %3(p0)
    RET_ReallyLR implicit $x0

...
---
name:            legalize_phi_empty
alignment:       2
exposesReturnsTwice: false
legalized:       false
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: '' }
  - { id: 10, class: _, preferred-register: '' }
liveins:
body:             |
  ; CHECK-LABEL: name: legalize_phi_empty
  ; CHECK: bb.0:
  ; CHECK:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK:   liveins: $w0
  ; CHECK:   [[COPY:%[0-9]+]]:_(s32) = COPY $w0
  ; CHECK:   [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
  ; CHECK:   [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 3
  ; CHECK:   [[C2:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
  ; CHECK:   [[ICMP:%[0-9]+]]:_(s32) = G_ICMP intpred(ugt), [[COPY]](s32), [[C]]
  ; CHECK:   [[TRUNC:%[0-9]+]]:_(s1) = G_TRUNC [[ICMP]](s32)
  ; CHECK:   [[ADD:%[0-9]+]]:_(s32) = G_ADD [[COPY]], [[C1]]
  ; CHECK:   G_BRCOND [[TRUNC]](s1), %bb.1
  ; CHECK:   G_BR %bb.2
  ; CHECK: bb.1:
  ; CHECK:   successors: %bb.3(0x80000000)
  ; CHECK:   [[ADD1:%[0-9]+]]:_(s32) = G_ADD [[COPY]], [[C2]]
  ; CHECK:   [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[ADD1]](s32)
  ; CHECK:   G_BR %bb.3
  ; CHECK: bb.2:
  ; CHECK:   successors: %bb.3(0x80000000)
  ; CHECK:   [[TRUNC2:%[0-9]+]]:_(s16) = G_TRUNC [[ADD]](s32)
  ; CHECK: bb.3:
  ; CHECK:   [[PHI:%[0-9]+]]:_(s16) = G_PHI [[TRUNC1]](s16), %bb.1, [[TRUNC2]](s16), %bb.2
  ; CHECK:   [[C3:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
  ; CHECK:   [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT [[PHI]](s16)
  ; CHECK:   [[AND:%[0-9]+]]:_(s32) = G_AND [[ANYEXT]], [[C3]]
  ; CHECK:   $w0 = COPY [[AND]](s32)
  ; CHECK:   RET_ReallyLR implicit $w0
  bb.0:
    successors: %bb.1(0x40000000), %bb.2(0x40000000)
    liveins: $w0
   ; Test that we properly legalize a phi with a predecessor that's empty




    %0(s32) = COPY $w0
    %1(s32) = G_CONSTANT i32 0
    %3(s32) = G_CONSTANT i32 3
    %6(s32) = G_CONSTANT i32 1
    %2(s1) = G_ICMP intpred(ugt), %0(s32), %1
    %4(s32) = G_ADD %0, %3
    %5(s1) = G_TRUNC %4(s32)
    G_BRCOND %2(s1), %bb.1
    G_BR %bb.2

  bb.1:
    successors: %bb.3(0x80000000)

    %7(s32) = G_ADD %0, %6
    %8(s1) = G_TRUNC %7(s32)
    G_BR %bb.3

  bb.2:
    successors: %bb.3(0x80000000)


  bb.3:
    %9(s1) = G_PHI %8(s1), %bb.1, %5(s1), %bb.2
    %10(s32) = G_ZEXT %9(s1)
    $w0 = COPY %10(s32)
    RET_ReallyLR implicit $w0

...
---
name:            legalize_phi_loop
alignment:       2
exposesReturnsTwice: false
legalized:       false
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: '' }
liveins:
body:             |
  ; CHECK-LABEL: name: legalize_phi_loop
  ; CHECK: bb.0:
  ; CHECK:   successors: %bb.1(0x80000000)
  ; CHECK:   liveins: $w0
  ; CHECK:   [[COPY:%[0-9]+]]:_(s32) = COPY $w0
  ; CHECK:   [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
  ; CHECK:   [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
  ; CHECK:   [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[C1]](s32)
  ; CHECK: bb.1:
  ; CHECK:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK:   [[PHI:%[0-9]+]]:_(s16) = G_PHI [[TRUNC]](s16), %bb.0, [[TRUNC3:%[0-9]+]](s16), %bb.1
  ; CHECK:   [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT [[PHI]](s16)
  ; CHECK:   [[COPY1:%[0-9]+]]:_(s32) = COPY [[C]](s32)
  ; CHECK:   [[ADD:%[0-9]+]]:_(s32) = G_ADD [[ANYEXT]], [[COPY1]]
  ; CHECK:   [[TRUNC1:%[0-9]+]]:_(s8) = G_TRUNC [[ADD]](s32)
  ; CHECK:   [[C2:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
  ; CHECK:   [[COPY2:%[0-9]+]]:_(s32) = COPY [[ADD]](s32)
  ; CHECK:   [[AND:%[0-9]+]]:_(s32) = G_AND [[COPY2]], [[C2]]
  ; CHECK:   [[ICMP:%[0-9]+]]:_(s32) = G_ICMP intpred(ugt), [[AND]](s32), [[COPY]]
  ; CHECK:   [[TRUNC2:%[0-9]+]]:_(s1) = G_TRUNC [[ICMP]](s32)
  ; CHECK:   [[TRUNC3]]:_(s16) = G_TRUNC [[ADD]](s32)
  ; CHECK:   G_BRCOND [[TRUNC2]](s1), %bb.1
  ; CHECK: bb.2:
  ; CHECK:   [[C3:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
  ; CHECK:   [[COPY3:%[0-9]+]]:_(s32) = COPY [[ADD]](s32)
  ; CHECK:   [[AND1:%[0-9]+]]:_(s32) = G_AND [[COPY3]], [[C3]]
  ; CHECK:   $w0 = COPY [[AND1]](s32)
  ; CHECK:   RET_ReallyLR implicit $w0
  bb.0:
    successors: %bb.1(0x80000000)
    liveins: $w0
   ; Test that we properly legalize a phi that uses a value from the same BB

    %0(s32) = COPY $w0
    %2(s8) = G_CONSTANT i8 1
    %7(s8) = G_CONSTANT i8 0

  bb.1:
    successors: %bb.1(0x40000000), %bb.3(0x40000000)

    %1(s8) = G_PHI %7(s8), %bb.0, %3(s8), %bb.1
    %3(s8) = G_ADD %1, %2
    %4(s32) = G_ZEXT %3(s8)
    %5(s1) = G_ICMP intpred(ugt), %4(s32), %0
    G_BRCOND %5(s1), %bb.1

  bb.3:
    %6(s32) = G_ZEXT %3(s8)
    $w0 = COPY %6(s32)
    RET_ReallyLR implicit $w0

...
---
name:            legalize_phi_cycle
alignment:       2
exposesReturnsTwice: false
legalized:       false
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: '' }
liveins:
body:             |
  ; CHECK-LABEL: name: legalize_phi_cycle
  ; CHECK: bb.0:
  ; CHECK:   successors: %bb.1(0x80000000)
  ; CHECK:   liveins: $w0
  ; CHECK:   [[COPY:%[0-9]+]]:_(s32) = COPY $w0
  ; CHECK:   [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
  ; CHECK:   [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[C]](s32)
  ; CHECK: bb.1:
  ; CHECK:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK:   [[PHI:%[0-9]+]]:_(s16) = G_PHI [[TRUNC]](s16), %bb.0, [[COPY1:%[0-9]+]](s16), %bb.1
  ; CHECK:   [[TRUNC1:%[0-9]+]]:_(s8) = G_TRUNC [[PHI]](s16)
  ; CHECK:   [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
  ; CHECK:   [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT [[PHI]](s16)
  ; CHECK:   [[AND:%[0-9]+]]:_(s32) = G_AND [[ANYEXT]], [[C1]]
  ; CHECK:   [[ICMP:%[0-9]+]]:_(s32) = G_ICMP intpred(ugt), [[AND]](s32), [[COPY]]
  ; CHECK:   [[TRUNC2:%[0-9]+]]:_(s1) = G_TRUNC [[ICMP]](s32)
  ; CHECK:   [[COPY1]]:_(s16) = COPY [[PHI]](s16)
  ; CHECK:   G_BRCOND [[TRUNC2]](s1), %bb.1
  ; CHECK: bb.2:
  ; CHECK:   $w0 = COPY [[AND]](s32)
  ; CHECK:   RET_ReallyLR implicit $w0
  bb.0:
    successors: %bb.1(0x80000000)
    liveins: $w0
   ; Test that we properly legalize a phi that uses itself


    %0(s32) = COPY $w0
    %4(s8) = G_CONSTANT i8 0

  bb.1:
    successors: %bb.1(0x40000000), %bb.3(0x40000000)

    %1(s8) = G_PHI %4(s8), %bb.0, %1(s8), %bb.1
    %2(s32) = G_ZEXT %1(s8)
    %3(s1) = G_ICMP intpred(ugt), %2(s32), %0
    G_BRCOND %3(s1), %bb.1

  bb.3:
    $w0 = COPY %2(s32)
    RET_ReallyLR implicit $w0

...
---
name:            legalize_phi_same_bb
alignment:       2
exposesReturnsTwice: false
legalized:       false
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: '' }
  - { id: 10, class: _, preferred-register: '' }
  - { id: 11, class: _, preferred-register: '' }
  - { id: 12, class: _, preferred-register: '' }
  - { id: 13, class: _, preferred-register: '' }
  - { id: 14, class: _, preferred-register: '' }
liveins:
body:             |
  ; CHECK-LABEL: name: legalize_phi_same_bb
  ; CHECK: bb.0:
  ; CHECK:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK:   liveins: $w0
  ; CHECK:   [[COPY:%[0-9]+]]:_(s32) = COPY $w0
  ; CHECK:   [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
  ; CHECK:   [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 3
  ; CHECK:   [[C2:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
  ; CHECK:   [[C3:%[0-9]+]]:_(s32) = G_CONSTANT i32 42
  ; CHECK:   [[ICMP:%[0-9]+]]:_(s32) = G_ICMP intpred(ugt), [[COPY]](s32), [[C]]
  ; CHECK:   [[TRUNC:%[0-9]+]]:_(s1) = G_TRUNC [[ICMP]](s32)
  ; CHECK:   [[ADD:%[0-9]+]]:_(s32) = G_ADD [[COPY]], [[C1]]
  ; CHECK:   G_BRCOND [[TRUNC]](s1), %bb.1
  ; CHECK:   G_BR %bb.2
  ; CHECK: bb.1:
  ; CHECK:   successors: %bb.3(0x80000000)
  ; CHECK:   [[ADD1:%[0-9]+]]:_(s32) = G_ADD [[COPY]], [[C2]]
  ; CHECK:   [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[ADD1]](s32)
  ; CHECK:   [[TRUNC2:%[0-9]+]]:_(s16) = G_TRUNC [[ADD1]](s32)
  ; CHECK:   G_BR %bb.3
  ; CHECK: bb.2:
  ; CHECK:   successors: %bb.3(0x80000000)
  ; CHECK:   [[TRUNC3:%[0-9]+]]:_(s16) = G_TRUNC [[C3]](s32)
  ; CHECK:   [[TRUNC4:%[0-9]+]]:_(s16) = G_TRUNC [[ADD]](s32)
  ; CHECK: bb.3:
  ; CHECK:   [[PHI:%[0-9]+]]:_(s16) = G_PHI [[TRUNC2]](s16), %bb.1, [[TRUNC4]](s16), %bb.2
  ; CHECK:   [[PHI1:%[0-9]+]]:_(s16) = G_PHI [[TRUNC1]](s16), %bb.1, [[TRUNC3]](s16), %bb.2
  ; CHECK:   [[C4:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
  ; CHECK:   [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT [[PHI]](s16)
  ; CHECK:   [[AND:%[0-9]+]]:_(s32) = G_AND [[ANYEXT]], [[C4]]
  ; CHECK:   [[C5:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
  ; CHECK:   [[ANYEXT1:%[0-9]+]]:_(s32) = G_ANYEXT [[PHI1]](s16)
  ; CHECK:   [[AND1:%[0-9]+]]:_(s32) = G_AND [[ANYEXT1]], [[C5]]
  ; CHECK:   [[ADD2:%[0-9]+]]:_(s32) = G_ADD [[AND]], [[AND1]]
  ; CHECK:   $w0 = COPY [[ADD2]](s32)
  ; CHECK:   RET_ReallyLR implicit $w0
  bb.0:
    successors: %bb.1(0x40000000), %bb.2(0x40000000)
    liveins: $w0
   ; Make sure that we correctly insert the new legalized G_PHI at the
   ; correct location (ie make sure G_PHIs are the first insts in the BB).




    %0(s32) = COPY $w0
    %1(s32) = G_CONSTANT i32 0
    %3(s32) = G_CONSTANT i32 3
    %6(s32) = G_CONSTANT i32 1
    %14(s8) = G_CONSTANT i8 42
    %2(s1) = G_ICMP intpred(ugt), %0(s32), %1
    %4(s32) = G_ADD %0, %3
    %5(s8) = G_TRUNC %4(s32)
    G_BRCOND %2(s1), %bb.1
    G_BR %bb.2

  bb.1:
    successors: %bb.3(0x80000000)

    %7(s32) = G_ADD %0, %6
    %8(s8) = G_TRUNC %7(s32)
    G_BR %bb.3

  bb.2:
    successors: %bb.3(0x80000000)


  bb.3:
    %9(s8) = G_PHI %8(s8), %bb.1, %5(s8), %bb.2
    %10(s8) = G_PHI %8(s8), %bb.1, %14(s8), %bb.2
    %11(s32) = G_ZEXT %9(s8)
    %12(s32) = G_ZEXT %10(s8)
    %13(s32) = G_ADD %11, %12
    $w0 = COPY %13(s32)
    RET_ReallyLR implicit $w0

...
---
name:            legalize_phi_diff_bb
alignment:       2
exposesReturnsTwice: false
legalized:       false
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: '' }
  - { id: 10, class: _, preferred-register: '' }
  - { id: 11, class: _, preferred-register: '' }
  - { id: 12, class: _, preferred-register: '' }
  - { id: 13, class: _, preferred-register: '' }
  - { id: 14, class: _, preferred-register: '' }
  - { id: 15, class: _, preferred-register: '' }
liveins:
body:             |
  ; CHECK-LABEL: name: legalize_phi_diff_bb
  ; CHECK: bb.0:
  ; CHECK:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK:   liveins: $w0, $w1
  ; CHECK:   [[COPY:%[0-9]+]]:_(s32) = COPY $w0
  ; CHECK:   [[COPY1:%[0-9]+]]:_(s32) = COPY $w1
  ; CHECK:   [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
  ; CHECK:   [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 3
  ; CHECK:   [[C2:%[0-9]+]]:_(s32) = G_CONSTANT i32 1
  ; CHECK:   [[C3:%[0-9]+]]:_(s32) = G_CONSTANT i32 44
  ; CHECK:   [[C4:%[0-9]+]]:_(s32) = G_CONSTANT i32 43
  ; CHECK:   [[ICMP:%[0-9]+]]:_(s32) = G_ICMP intpred(ugt), [[COPY]](s32), [[C]]
  ; CHECK:   [[TRUNC:%[0-9]+]]:_(s1) = G_TRUNC [[ICMP]](s32)
  ; CHECK:   [[ADD:%[0-9]+]]:_(s32) = G_ADD [[COPY]], [[C1]]
  ; CHECK:   [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[ADD]](s32)
  ; CHECK:   [[TRUNC2:%[0-9]+]]:_(s16) = G_TRUNC [[ADD]](s32)
  ; CHECK:   G_BRCOND [[TRUNC]](s1), %bb.1
  ; CHECK:   G_BR %bb.2
  ; CHECK: bb.1:
  ; CHECK:   successors: %bb.2(0x40000000), %bb.1(0x40000000)
  ; CHECK:   [[PHI:%[0-9]+]]:_(s16) = G_PHI [[TRUNC2]](s16), %bb.0, [[TRUNC5:%[0-9]+]](s16), %bb.1
  ; CHECK:   [[TRUNC3:%[0-9]+]]:_(s8) = G_TRUNC [[PHI]](s16)
  ; CHECK:   [[C5:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
  ; CHECK:   [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT [[PHI]](s16)
  ; CHECK:   [[AND:%[0-9]+]]:_(s32) = G_AND [[ANYEXT]], [[C5]]
  ; CHECK:   [[ADD1:%[0-9]+]]:_(s32) = G_ADD [[AND]], [[C2]]
  ; CHECK:   [[ICMP1:%[0-9]+]]:_(s32) = G_ICMP intpred(ugt), [[ADD1]](s32), [[C3]]
  ; CHECK:   [[TRUNC4:%[0-9]+]]:_(s1) = G_TRUNC [[ICMP1]](s32)
  ; CHECK:   [[COPY2:%[0-9]+]]:_(s16) = COPY [[PHI]](s16)
  ; CHECK:   [[TRUNC5]]:_(s16) = G_TRUNC [[C4]](s32)
  ; CHECK:   G_BRCOND [[TRUNC4]](s1), %bb.2
  ; CHECK:   G_BR %bb.1
  ; CHECK: bb.2:
  ; CHECK:   [[PHI1:%[0-9]+]]:_(s16) = G_PHI [[COPY2]](s16), %bb.1, [[TRUNC1]](s16), %bb.0
  ; CHECK:   [[C6:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
  ; CHECK:   [[ANYEXT1:%[0-9]+]]:_(s32) = G_ANYEXT [[PHI1]](s16)
  ; CHECK:   [[AND1:%[0-9]+]]:_(s32) = G_AND [[ANYEXT1]], [[C6]]
  ; CHECK:   $w0 = COPY [[AND1]](s32)
  ; CHECK:   RET_ReallyLR implicit $w0
  bb.0:
    successors: %bb.1(0x40000000), %bb.3(0x40000000)
    liveins: $w0, $w1
   ; Make sure that we correctly legalize PHIs sharing common defs
   ; in different BBs.



    %0(s32) = COPY $w0
    %1(s32) = COPY $w1
    %2(s32) = G_CONSTANT i32 0
    %4(s32) = G_CONSTANT i32 3
    %9(s32) = G_CONSTANT i32 1
    %11(s32) = G_CONSTANT i32 44
    %15(s8) = G_CONSTANT i8 43
    %3(s1) = G_ICMP intpred(ugt), %0(s32), %2
    %5(s32) = G_ADD %0, %4
    %6(s8) = G_TRUNC %5(s32)
    G_BRCOND %3(s1), %bb.1
    G_BR %bb.3

  bb.1:
    successors: %bb.3(0x40000000), %bb.1(0x40000000)

    %7(s8) = G_PHI %6(s8), %bb.0, %15(s8), %bb.1
    %8(s32) = G_ZEXT %7(s8)
    %10(s32) = G_ADD %8, %9
    %12(s1) = G_ICMP intpred(ugt), %10(s32), %11
    G_BRCOND %12(s1), %bb.3
    G_BR %bb.1

  bb.3:
    %13(s8) = G_PHI %7(s8), %bb.1, %6(s8), %bb.0
    %14(s32) = G_ZEXT %13(s8)
    $w0 = COPY %14(s32)
    RET_ReallyLR implicit $w0

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