# RUN: llc -mtriple=hexagon -run-pass hexagon-peephole \
# RUN:   -disable-hexagon-optszext=false \
# RUN:   -disable-hexagon-opt-ext-to-64=false -o - %s | FileCheck %s

# Test coverage for HexagonPeephole:
# 1) SXTW + COPY isub_lo optimization
# 2) A4_combineir(0, r) + COPY isub_lo optimization
# 3) S2_lsr_i_p(d, 32) + COPY isub_lo -> COPY isub_hi

--- |
  define void @test_sxtw_copy() { ret void }
  define void @test_combine_copy() { ret void }
  define void @test_lsr_copy() { ret void }
...

---
# SXTW + COPY isub_lo should be peepholed: the COPY should use the
# original 32-bit source directly instead of extracting from the sxtw result.
# CHECK-LABEL: name: test_sxtw_copy
# CHECK: %2:intregs = COPY %0
name: test_sxtw_copy
tracksRegLiveness: true
registers:
  - { id: 0, class: intregs }
  - { id: 1, class: doubleregs }
  - { id: 2, class: intregs }
body: |
  bb.0:
    liveins: $r0
    %0:intregs = COPY $r0
    %1:doubleregs = A2_sxtw %0
    %2:intregs = COPY %1.isub_lo
    $r0 = COPY %2
    J2_jumpr $r31, implicit-def dead $pc, implicit killed $r0
...

---
# A4_combineir(0, r) + COPY isub_lo optimization: the COPY should use
# the 32-bit source register directly.
# CHECK-LABEL: name: test_combine_copy
# CHECK: %2:intregs = COPY %0
name: test_combine_copy
tracksRegLiveness: true
registers:
  - { id: 0, class: intregs }
  - { id: 1, class: doubleregs }
  - { id: 2, class: intregs }
body: |
  bb.0:
    liveins: $r0
    %0:intregs = COPY $r0
    %1:doubleregs = A4_combineir 0, %0
    %2:intregs = COPY %1.isub_lo
    $r0 = COPY %2
    J2_jumpr $r31, implicit-def dead $pc, implicit killed $r0
...

---
# S2_lsr_i_p(d, 32) + COPY isub_lo should be transformed to
# COPY isub_hi from the original double register.
# CHECK-LABEL: name: test_lsr_copy
# CHECK: %2:intregs = COPY %0.isub_hi
name: test_lsr_copy
tracksRegLiveness: true
registers:
  - { id: 0, class: doubleregs }
  - { id: 1, class: doubleregs }
  - { id: 2, class: intregs }
body: |
  bb.0:
    liveins: $d0
    %0:doubleregs = COPY $d0
    %1:doubleregs = S2_lsr_i_p %0, 32
    %2:intregs = COPY %1.isub_lo
    $r0 = COPY %2
    J2_jumpr $r31, implicit-def dead $pc, implicit killed $r0
...