TheRock/compiler/amd-llvm/llvm/test/CodeGen/AArch64/PHIElimination-reuse-copy.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
# RUN: llc -run-pass=livevars,phi-node-elimination -verify-machineinstrs -mtriple=aarch64-linux-gnu -o - %s | FileCheck %s

# Verify that the original COPY in bb.1 is reappropriated as the PHI source in bb.2,
# instead of creating a new COPY with the same source register.

---
name: copy_virtual_reg
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: copy_virtual_reg
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.2(0x40000000), %bb.1(0x40000000)
  ; CHECK-NEXT:   liveins: $nzcv, $w0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   %a:gpr32 = COPY killed $w0
  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:gpr32 = IMPLICIT_DEF
  ; CHECK-NEXT:   Bcc 8, %bb.2, implicit killed $nzcv
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.2(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   %b:gpr32 = COPY killed %a
  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:gpr32 = COPY killed %b
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   %c:gpr32 = COPY killed [[DEF]]
  ; CHECK-NEXT:   dead %d:gpr32 = COPY killed %c
  bb.0:
    liveins: $nzcv, $w0
    %a:gpr32 = COPY $w0
    Bcc 8, %bb.2, implicit $nzcv
  bb.1:
    %b:gpr32 = COPY %a:gpr32
  bb.2:
    %c:gpr32 = PHI %b:gpr32, %bb.1, undef %undef:gpr32, %bb.0
    %d:gpr32 = COPY %c:gpr32
...

---
name: copy_physical_reg
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: copy_physical_reg
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.2(0x40000000), %bb.1(0x40000000)
  ; CHECK-NEXT:   liveins: $nzcv, $w0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:gpr32 = IMPLICIT_DEF
  ; CHECK-NEXT:   Bcc 8, %bb.2, implicit killed $nzcv
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.2(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   dead $x0 = IMPLICIT_DEF implicit-def $w0
  ; CHECK-NEXT:   %a:gpr32 = COPY killed $w0
  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:gpr32 = COPY killed %a
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   dead %b:gpr32 = COPY killed [[DEF]]
  bb.0:
    liveins: $nzcv, $w0
    Bcc 8, %bb.2, implicit $nzcv
  bb.1:
    $x0 = IMPLICIT_DEF
    %a:gpr32 = COPY $w0
  bb.2:
    %b:gpr32 = PHI %a:gpr32, %bb.1, undef %undef:gpr32, %bb.0
...

---
name: copy_to_dead
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: copy_to_dead
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.2(0x40000000), %bb.1(0x40000000)
  ; CHECK-NEXT:   liveins: $wzr, $xzr
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:gpr32 = COPY $wzr
  ; CHECK-NEXT:   dead [[COPY1:%[0-9]+]]:gpr64 = COPY $xzr
  ; CHECK-NEXT:   TBZW killed [[COPY]], 0, %bb.2
  ; CHECK-NEXT:   B %bb.1
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.2(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   dead [[DEF:%[0-9]+]]:gpr64 = IMPLICIT_DEF
  ; CHECK-NEXT:   dead [[DEF1:%[0-9]+]]:gpr64 = IMPLICIT_DEF
  ; CHECK-NEXT:   B %bb.2
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   dead [[DEF2:%[0-9]+]]:gpr64 = IMPLICIT_DEF
  ; CHECK-NEXT:   dead [[DEF3:%[0-9]+]]:gpr64 = IMPLICIT_DEF
  ; CHECK-NEXT:   B %bb.1
  bb.0:
    liveins: $wzr, $xzr

    %9:gpr32 = COPY $wzr
    dead %5:gpr64 = COPY $xzr
    TBZW killed %9:gpr32, 0, %bb.2
    B %bb.1

  bb.1:
    successors: %bb.2(0x80000000); %bb.2(100.00%)

    dead %1:gpr64 = PHI undef %3:gpr64, %bb.2, undef %5:gpr64, %bb.0
    dead %2:gpr64 = PHI undef %4:gpr64, %bb.2, undef %5:gpr64, %bb.0
    B %bb.2

  bb.2:
    successors: %bb.1(0x80000000); %bb.1(100.00%)

    dead %3:gpr64 = PHI undef %1:gpr64, %bb.1, undef %5:gpr64, %bb.0
    dead %4:gpr64 = PHI undef %2:gpr64, %bb.1, undef %5:gpr64, %bb.0
    B %bb.1

...

---
name: update_livevars
tracksRegLiveness: true
body:             |
  ; CHECK-LABEL: name: update_livevars
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $w0, $w1, $nzcv
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:gpr32 = COPY killed $w0
  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:gpr32 = COPY killed $w1
  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:gpr32 = COPY killed [[COPY1]]
  ; CHECK-NEXT:   B %bb.1
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.2(0x40000000), %bb.1(0x40000000)
  ; CHECK-NEXT:   liveins: $nzcv
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   dead [[COPY3:%[0-9]+]]:gpr32 = COPY killed [[COPY2]]
  ; CHECK-NEXT:   [[COPY4:%[0-9]+]]:gpr32 = COPY [[COPY]]
  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:gpr32 = COPY [[COPY4]]
  ; CHECK-NEXT:   Bcc 1, %bb.1, implicit $nzcv
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $nzcv
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:gpr32 = COPY killed [[COPY4]]
  ; CHECK-NEXT:   B %bb.1
  bb.0:
    successors: %bb.1
    liveins: $w0, $w1, $nzcv

    %0:gpr32 = COPY killed $w0
    %1:gpr32 = COPY killed $w1
    B %bb.1

  bb.1:
    successors: %bb.2, %bb.1
    liveins: $nzcv

    %2:gpr32 = PHI %3, %bb.2, %1, %bb.0, %3, %bb.1
    %3:gpr32 = COPY %0
    Bcc 1, %bb.1, implicit $nzcv

  bb.2:
    successors: %bb.1
    liveins: $nzcv

    B %bb.1
...

---
name: copy_subreg
tracksRegLiveness: true
body:             |
  ; CHECK-LABEL: name: copy_subreg
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $x0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   [[COPY:%[0-9]+]]:gpr64 = COPY killed $x0
  ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:gpr64 = COPY killed [[COPY]]
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   dead [[COPY2:%[0-9]+]]:gpr32 = COPY killed [[COPY1]].sub_32
  bb.0:
    successors: %bb.1
    liveins: $x0

    %0:gpr64 = COPY killed $x0
    %1:gpr64 = COPY killed %0

  bb.1:
    %2:gpr32 = PHI %1.sub_32, %bb.0
...