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Compiler projects using llvm 
# RUN: llc -mtriple=aarch64--linux-gnu -run-pass=aarch64-copyelim %s -verify-machineinstrs -o - | FileCheck %s
---
# CHECK-LABEL: name: test1
# CHECK: ANDSWri $w0, 1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $wzr
name:            test1
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $x1, $x2

    $w0 = ANDSWri $w0, 1, implicit-def $nzcv
    STRWui killed $w0, killed $x1, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x2

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x2, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test2
# CHECK: ANDSXri $x0, 1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $xzr
name:            test2
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    $x0 = ANDSXri $x0, 1, implicit-def $nzcv
    STRXui killed $x0, killed $x1, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x2

    $x0 = COPY $xzr
    STRXui killed $x0, killed $x2, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test3
# CHECK: ADDSWri $w0, 1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $wzr
name:            test3
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $x1, $x2

    $w0 = ADDSWri $w0, 1, 0, implicit-def $nzcv
    STRWui killed $w0, killed $x1, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x2

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x2, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test4
# CHECK: ADDSXri $x0, 1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $xzr
name:            test4
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    $x0 = ADDSXri $x0, 1, 0, implicit-def $nzcv
    STRXui killed $x0, killed $x1, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x2

    $x0 = COPY $xzr
    STRXui killed $x0, killed $x2, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test5
# CHECK: SUBSWri $w0, 1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $wzr
name:            test5
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $x1, $x2

    $w0 = SUBSWri $w0, 1, 0, implicit-def $nzcv
    STRWui killed $w0, killed $x1, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x2

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x2, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test6
# CHECK: SUBSXri $x0, 1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $xzr
name:            test6
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    $x0 = SUBSXri $x0, 1, 0, implicit-def $nzcv
    STRXui killed $x0, killed $x1, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x2

    $x0 = COPY $xzr
    STRXui killed $x0, killed $x2, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test7
# CHECK: ADDSWrr $w0, $w1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $wzr
name:            test7
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $w1, $x2, $x3

    $w0 = ADDSWrr $w0, $w1, implicit-def $nzcv
    STRWui killed $w0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test8
# CHECK: ADDSXrr $x0, $x1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $xzr
name:            test8
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x2, $x3

    $x0 = ADDSXrr $x0, $x1, implicit-def $nzcv
    STRXui killed $x0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $x0 = COPY $xzr
    STRXui killed $x0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test9
# CHECK: ANDSWrr $w0, $w1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $wzr
name:            test9
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $w1, $x2, $x3

    $w0 = ANDSWrr $w0, $w1, implicit-def $nzcv
    STRWui killed $w0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test10
# CHECK: ANDSXrr $x0, $x1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $xzr
name:            test10
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x2, $x3

    $x0 = ANDSXrr $x0, $x1, implicit-def $nzcv
    STRXui killed $x0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $x0 = COPY $xzr
    STRXui killed $x0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test11
# CHECK: BICSWrr $w0, $w1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $wzr
name:            test11
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $w1, $x2, $x3

    $w0 = BICSWrr $w0, $w1, implicit-def $nzcv
    STRWui killed $w0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test12
# CHECK: BICSXrr $x0, $x1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $xzr
name:            test12
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x2, $x3

    $x0 = BICSXrr $x0, $x1, implicit-def $nzcv
    STRXui killed $x0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $x0 = COPY $xzr
    STRXui killed $x0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test13
# CHECK: SUBSWrr $w0, $w1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $wzr
name:            test13
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $w1, $x2, $x3

    $w0 = SUBSWrr $w0, $w1, implicit-def $nzcv
    STRWui killed $w0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test14
# CHECK: SUBSXrr $x0, $x1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $xzr
name:            test14
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x2, $x3

    $x0 = SUBSXrr $x0, $x1, implicit-def $nzcv
    STRXui killed $x0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $x0 = COPY $xzr
    STRXui killed $x0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test15
# CHECK: ADDSWrs $w0, $w1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $wzr
name:            test15
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $w1, $x2, $x3

    $w0 = ADDSWrs $w0, $w1, 0, implicit-def $nzcv
    STRWui killed $w0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test16
# CHECK: ADDSXrs $x0, $x1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $xzr
name:            test16
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x2, $x3

    $x0 = ADDSXrs $x0, $x1, 0, implicit-def $nzcv
    STRXui killed $x0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $x0 = COPY $xzr
    STRXui killed $x0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test17
# CHECK: ANDSWrs $w0, $w1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $wzr
name:            test17
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $w1, $x2, $x3

    $w0 = ANDSWrs $w0, $w1, 0, implicit-def $nzcv
    STRWui killed $w0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test18
# CHECK: ANDSXrs $x0, $x1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $xzr
name:            test18
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x2, $x3

    $x0 = ANDSXrs $x0, $x1, 0, implicit-def $nzcv
    STRXui killed $x0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $x0 = COPY $xzr
    STRXui killed $x0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# CHECK-LABEL: name: test19
# CHECK: BICSWrs $w0, $w1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: COPY $wzr
name:            test19
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $w1, $x2, $x3

    $w0 = BICSWrs $w0, $w1, 0, implicit-def $nzcv
    STRWui killed $w0, killed $x2, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x3

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x3, 0

  bb.2:
    RET_ReallyLR
...
# Unicorn test - we can remove a redundant copy and a redundant mov
# CHECK-LABEL: name: test20
# CHECK: SUBSWri $w1, 1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK-NOT: $w0 = COPY $wzr
# CHECK-NOT: $w1 = MOVi32imm 1
name:            test20
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w1, $x2

    $w0 = SUBSWri $w1, 1, 0, implicit-def $nzcv
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x2

    $w0 = COPY $wzr
    $w1 = MOVi32imm 1
    STRWui killed $w0, $x2, 0
    STRWui killed $w1, killed $x2, 1

  bb.2:
    RET_ReallyLR

...
# Negative test - MOVi32imm clobbers $w0
# CHECK-LABEL: name: test21
# CHECK: ANDSWri $w0, 1, implicit-def $nzcv
# CHECK: bb.1:
# CHECK: $w0 = COPY $wzr
name:            test21
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $x1, $x2

    $w0 = ANDSWri $w0, 1, implicit-def $nzcv
    STRWui killed $w0, $x1, 0
    $w0 = MOVi32imm -1
    STRWui killed $w0, killed $x1, 1
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x2

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x2, 0

  bb.2:
    RET_ReallyLR
...
# Negative test - SUBSXri self-clobbers x0, so MOVi64imm can't be removed
# CHECK-LABEL: name: test22
# CHECK: SUBSXri $x0, 1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK: $x0 = MOVi64imm 1
name:            test22
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x2

    $x0 = SUBSXri $x0, 1, 0, implicit-def $nzcv
    STRXui killed $x0, killed $x1, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.1:
    liveins: $x2

    $x0 = MOVi64imm 1
    STRXui killed $x0, killed $x2, 0

  bb.2:
    RET_ReallyLR
...
# Negative test - bb.1 has multiple preds
# CHECK-LABEL: name: test23
# CHECK: ADDSWri $w0, 1, 0, implicit-def $nzcv
# CHECK: bb.1:
# CHECK: COPY $wzr
name:            test23
tracksRegLiveness: true
body:             |
  bb.0.entry:
    liveins: $w0, $x1, $x2

    $w0 = ADDSWri $w0, 1, 0, implicit-def $nzcv
    STRWui killed $w0, killed $x1, 0
    Bcc 1, %bb.2, implicit killed $nzcv
    B %bb.1

  bb.3:
    liveins: $x2

    B %bb.1

  bb.1:
    liveins: $x2

    $w0 = COPY $wzr
    STRWui killed $w0, killed $x2, 0

  bb.2:
    RET_ReallyLR