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Compiler projects using llvm 
# RUN: llc -march=hexagon -o - %s -run-pass=machine-cp | FileCheck %s

---
name: dont_propagate_past_lower_subreg_kill
tracksRegLiveness: true
body: |
  bb.0:
    ; CHECK-LABEL: name: dont_propagate_past_lower_subreg_kill
    ; CHECK: A2_nop implicit-def $d0
    ; CHECK: A2_nop implicit-def $r2
    ; CHECK: A2_nop implicit killed $r2
    ; CHECK: $d1 = COPY killed $d0
    ; CHECK: $d2 = COPY $d1
    ; CHECK: A2_nop implicit $d2
    A2_nop implicit-def $d0
    $d1 = COPY killed $d0
    $d0 = COPY killed $d1

    A2_nop implicit-def $r2
    A2_nop implicit killed $r2

    $d1 = COPY killed $d0
    $d2 = COPY $d1
    A2_nop implicit $d2

...

---
name: dont_propagate_past_upper_subreg_kill
tracksRegLiveness: true
body: |
  bb.0:
    ; CHECK-LABEL: name: dont_propagate_past_upper_subreg_kill
    ; CHECK: A2_nop implicit-def $d0
    ; CHECK: A2_nop implicit-def $r3
    ; CHECK: A2_nop implicit killed $r3
    ; CHECK: $d1 = COPY killed $d0
    ; CHECK: $d2 = COPY $d1
    ; CHECK: A2_nop implicit $d2
    A2_nop implicit-def $d0
    $d1 = COPY killed $d0
    $d0 = COPY killed $d1

    A2_nop implicit-def $r3
    A2_nop implicit killed $r3

    $d1 = COPY killed $d0
    $d2 = COPY $d1
    A2_nop implicit $d2

...