test/CodeGen/AArch64/mlicm-implicit-defs.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
# RUN: llc -mtriple=aarch64 -run-pass machinelicm -verify-machineinstrs -o - %s | FileCheck %s
# RUN: llc -mtriple=aarch64 -passes machinelicm -o - %s | FileCheck %s

---
name: unsafe_to_move
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: unsafe_to_move
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $x0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $x16 = COPY killed $x0
  ; CHECK-NEXT:   B %bb.1
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK-NEXT:   liveins: $x16
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $x1 = COPY killed $x16
  ; CHECK-NEXT:   $x2 = MOVi64imm 1024, implicit-def dead $x16
  ; CHECK-NEXT:   $x16 = LDRXroX killed $x1, killed $x2, 0, 0
  ; CHECK-NEXT:   $xzr = SUBSXri $x16, 0, 0, implicit-def $nzcv
  ; CHECK-NEXT:   Bcc 1, %bb.1, implicit $nzcv
  ; CHECK-NEXT:   B %bb.2
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   liveins: $x1
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $x0 = COPY killed $x1
  ; CHECK-NEXT:   RET_ReallyLR
  bb.0:
    liveins: $x0
    $x16 = COPY killed $x0
    B %bb.1

  bb.1:
    liveins: $x16
    $x1 = COPY killed $x16
    /* MOVi64imm below mimics a pseudo instruction that doesn't have any */
    /* unmodelled side effects, but uses x16 as a scratch register.      */
    $x2 = MOVi64imm 1024, implicit-def dead $x16
    $x16 = LDRXroX killed $x1, killed $x2, 0, 0
    $xzr = SUBSXri $x16, 0, 0, implicit-def $nzcv
    Bcc 1, %bb.1, implicit $nzcv
    B %bb.2

  bb.2:
    liveins: $x1
    $x0 = COPY killed $x1
    RET_ReallyLR
...

---
name: dead_implicit_def
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: dead_implicit_def
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $x0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $x12 = COPY killed $x0
  ; CHECK-NEXT:   $x2 = MOVi64imm 1024, implicit-def dead $x16
  ; CHECK-NEXT:   B %bb.1
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK-NEXT:   liveins: $x12, $x2
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $x1 = COPY killed $x12
  ; CHECK-NEXT:   $x16 = LDRXroX killed $x1, $x2, 0, 0
  ; CHECK-NEXT:   $xzr = SUBSXri $x16, 0, 0, implicit-def $nzcv
  ; CHECK-NEXT:   Bcc 1, %bb.1, implicit $nzcv
  ; CHECK-NEXT:   B %bb.2
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   liveins: $x1
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $x0 = COPY killed $x1
  ; CHECK-NEXT:   RET_ReallyLR
  bb.0:
    liveins: $x0
    $x12 = COPY killed $x0
    B %bb.1

  bb.1:
    liveins: $x12
    $x1 = COPY killed $x12
    /* MOVi64imm below mimics a pseudo instruction that doesn't have any */
    /* unmodelled side effects, but uses x16 as a scratch register.      */
    $x2 = MOVi64imm 1024, implicit-def dead $x16
    $x16 = LDRXroX killed $x1, killed $x2, 0, 0
    $xzr = SUBSXri $x16, 0, 0, implicit-def $nzcv
    Bcc 1, %bb.1, implicit $nzcv
    B %bb.2

  bb.2:
    liveins: $x1
    $x0 = COPY killed $x1
    RET_ReallyLR
...