# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -o - -mtriple=aarch64-unknown-unknown -run-pass=aarch64-prelegalizer-combiner -verify-machineinstrs  %s | FileCheck %s

# Simple unmerge(merge) case with two operands.
# The sources of the merge can be used in place of
# the destinations of the unmerge.
---
name:            test_combine_unmerge_merge
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_merge
    ; CHECK: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: [[DEF1:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: $w0 = COPY [[DEF]](s32)
    ; CHECK: $w1 = COPY [[DEF1]](s32)
    %0:_(s32) = G_IMPLICIT_DEF
    %1:_(s32) = G_IMPLICIT_DEF
    %2:_(s64) = G_MERGE_VALUES %0(s32), %1(s32)
    %3:_(s32), %4:_(s32) = G_UNMERGE_VALUES %2(s64)
    $w0 = COPY %3(s32)
    $w1 = COPY %4(s32)
...

# Simple unmerge(merge) case with three operands.
# The sources of the merge can be used in place of
# the destinations of the unmerge.
---
name:            test_combine_unmerge_merge_3ops
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_merge_3ops
    ; CHECK: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: [[DEF1:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: [[DEF2:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: $w0 = COPY [[DEF]](s32)
    ; CHECK: $w1 = COPY [[DEF1]](s32)
    ; CHECK: $w2 = COPY [[DEF2]](s32)
    %0:_(s32) = G_IMPLICIT_DEF
    %1:_(s32) = G_IMPLICIT_DEF
    %5:_(s32) = G_IMPLICIT_DEF
    %2:_(s96) = G_MERGE_VALUES %0(s32), %1(s32), %5(s32)
    %3:_(s32), %4:_(s32), %6:_(s32) = G_UNMERGE_VALUES %2(s96)
    $w0 = COPY %3(s32)
    $w1 = COPY %4(s32)
    $w2 = COPY %6(s32)
...

# Simple unmerge(buildvector) case with two operands.
# The sources of the buildvector can be used in place of
# the destinations of the unmerge.
---
name:            test_combine_unmerge_build_vector
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_build_vector
    ; CHECK: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: [[DEF1:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: $w0 = COPY [[DEF]](s32)
    ; CHECK: $w1 = COPY [[DEF1]](s32)
    %0:_(s32) = G_IMPLICIT_DEF
    %1:_(s32) = G_IMPLICIT_DEF
    %2:_(<2 x s32>) = G_BUILD_VECTOR %0(s32), %1(s32)
    %3:_(s32), %4:_(s32) = G_UNMERGE_VALUES %2(<2 x s32>)
    $w0 = COPY %3(s32)
    $w1 = COPY %4(s32)
...

# Simple unmerge(buildvector) case with three operands.
# The sources of the buildvector can be used in place of
# the destinations of the unmerge.
---
name:            test_combine_unmerge_buildvector_3ops
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_buildvector_3ops
    ; CHECK: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: [[DEF1:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: [[DEF2:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: $w0 = COPY [[DEF]](s32)
    ; CHECK: $w1 = COPY [[DEF1]](s32)
    ; CHECK: $w2 = COPY [[DEF2]](s32)
    %0:_(s32) = G_IMPLICIT_DEF
    %1:_(s32) = G_IMPLICIT_DEF
    %5:_(s32) = G_IMPLICIT_DEF
    %2:_(<3 x s32>) = G_BUILD_VECTOR %0(s32), %1(s32), %5(s32)
    %3:_(s32), %4:_(s32), %6:_(s32) = G_UNMERGE_VALUES %2(<3 x s32>)
    $w0 = COPY %3(s32)
    $w1 = COPY %4(s32)
    $w2 = COPY %6(s32)
...

# Simple unmerge(concatvectors) case.
# The sources of the concatvectors can be used in place of
# the destinations of the unmerge.
---
name:            test_combine_unmerge_concat_vectors
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_concat_vectors
    ; CHECK: [[COPY:%[0-9]+]]:_(<2 x s16>) = COPY $w0
    ; CHECK: [[COPY1:%[0-9]+]]:_(<2 x s16>) = COPY $w1
    ; CHECK: $w0 = COPY [[COPY]](<2 x s16>)
    ; CHECK: $w1 = COPY [[COPY1]](<2 x s16>)
    %0:_(<2 x s16>) = COPY $w0
    %1:_(<2 x s16>) = COPY $w1
    %2:_(<4 x s16>) = G_CONCAT_VECTORS %0(<2 x s16>), %1(<2 x s16>)
    %3:_(<2 x s16>), %4:_(<2 x s16>) = G_UNMERGE_VALUES %2(<4 x s16>)
    $w0 = COPY %3(<2 x s16>)
    $w1 = COPY %4(<2 x s16>)
...

# Unmerge(merge) case with two operands and a bitcast in the middle.
# The sources of the merge can be used in place of
# the destinations of the unmerge.
---
name:            test_combine_unmerge_bitcast_merge
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_bitcast_merge
    ; CHECK: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: [[DEF1:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: $w0 = COPY [[DEF]](s32)
    ; CHECK: $w1 = COPY [[DEF1]](s32)
    %0:_(s32) = G_IMPLICIT_DEF
    %1:_(s32) = G_IMPLICIT_DEF
    %2:_(s64) = G_MERGE_VALUES %0(s32), %1(s32)
    %5:_(<2 x s32>) = G_BITCAST %2(s64)
    %3:_(s32), %4:_(s32) = G_UNMERGE_VALUES %5(<2 x s32>)
    $w0 = COPY %3(s32)
    $w1 = COPY %4(s32)
...

# Unmerge(merge) with incompatible types: unmerge destTy != merge inputTy.
# The sources of the merge cannot be used in place of
# the destinations of the unmerge, since the types don't match.
---
name:            test_combine_unmerge_merge_incompatible_types
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_merge_incompatible_types
    ; CHECK: [[DEF:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: [[DEF1:%[0-9]+]]:_(s32) = G_IMPLICIT_DEF
    ; CHECK: [[MV:%[0-9]+]]:_(s64) = G_MERGE_VALUES [[DEF]](s32), [[DEF1]](s32)
    ; CHECK: [[UV:%[0-9]+]]:_(s16), [[UV1:%[0-9]+]]:_(s16), [[UV2:%[0-9]+]]:_(s16), [[UV3:%[0-9]+]]:_(s16) = G_UNMERGE_VALUES [[MV]](s64)
    ; CHECK: $h0 = COPY [[UV]](s16)
    ; CHECK: $h1 = COPY [[UV1]](s16)
    ; CHECK: $h2 = COPY [[UV2]](s16)
    ; CHECK: $h3 = COPY [[UV3]](s16)
    %0:_(s32) = G_IMPLICIT_DEF
    %1:_(s32) = G_IMPLICIT_DEF
    %2:_(s64) = G_MERGE_VALUES %0(s32), %1(s32)
    %3:_(s16), %4:_(s16), %5:_(s16), %6:_(s16) = G_UNMERGE_VALUES %2(s64)
    $h0 = COPY %3(s16)
    $h1 = COPY %4(s16)
    $h2 = COPY %5(s16)
    $h3 = COPY %6(s16)
...

# Unmerge(concatvectors) with incompatible types: unmerge destTy != merge inputTy
# but destTy.size() == inputTy.size().
# The sources of the concatvectors can be used in place of
# the destinations of the unmerge with a bitcast since the sizes
# match.
---
name:            test_combine_unmerge_merge_incompatible_types_but_same_size
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_merge_incompatible_types_but_same_size
    ; CHECK: [[COPY:%[0-9]+]]:_(<2 x s16>) = COPY $w0
    ; CHECK: [[COPY1:%[0-9]+]]:_(<2 x s16>) = COPY $w1
    ; CHECK: [[BITCAST:%[0-9]+]]:_(s32) = G_BITCAST [[COPY]](<2 x s16>)
    ; CHECK: [[BITCAST1:%[0-9]+]]:_(s32) = G_BITCAST [[COPY1]](<2 x s16>)
    ; CHECK: $w0 = COPY [[BITCAST]](s32)
    ; CHECK: $w1 = COPY [[BITCAST1]](s32)
    %0:_(<2 x s16>) = COPY $w0
    %1:_(<2 x s16>) = COPY $w1
    %2:_(<4 x s16>) = G_CONCAT_VECTORS %0(<2 x s16>), %1(<2 x s16>)
    %5:_(s64) = G_BITCAST %2(<4 x s16>)
    %3:_(s32), %4:_(s32) = G_UNMERGE_VALUES %5(s64)
    $w0 = COPY %3(s32)
    $w1 = COPY %4(s32)
...

# Unmerge a constant into a bunch of smaller constant.
# Constant is 0x0102030405060708090a0b0c0d0e0f10 and we break it down into
# bytes:
# cst1 0x10
# cst2 0x0f
# cst3 0x0e
# ...
---
name:            test_combine_unmerge_cst
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_cst
    ; CHECK: [[C:%[0-9]+]]:_(s8) = G_CONSTANT i8 16
    ; CHECK: [[C1:%[0-9]+]]:_(s8) = G_CONSTANT i8 15
    ; CHECK: [[C2:%[0-9]+]]:_(s8) = G_CONSTANT i8 14
    ; CHECK: [[C3:%[0-9]+]]:_(s8) = G_CONSTANT i8 13
    ; CHECK: [[C4:%[0-9]+]]:_(s8) = G_CONSTANT i8 12
    ; CHECK: [[C5:%[0-9]+]]:_(s8) = G_CONSTANT i8 11
    ; CHECK: [[C6:%[0-9]+]]:_(s8) = G_CONSTANT i8 10
    ; CHECK: [[C7:%[0-9]+]]:_(s8) = G_CONSTANT i8 9
    ; CHECK: [[C8:%[0-9]+]]:_(s8) = G_CONSTANT i8 8
    ; CHECK: [[C9:%[0-9]+]]:_(s8) = G_CONSTANT i8 7
    ; CHECK: [[C10:%[0-9]+]]:_(s8) = G_CONSTANT i8 6
    ; CHECK: [[C11:%[0-9]+]]:_(s8) = G_CONSTANT i8 5
    ; CHECK: [[C12:%[0-9]+]]:_(s8) = G_CONSTANT i8 4
    ; CHECK: [[C13:%[0-9]+]]:_(s8) = G_CONSTANT i8 3
    ; CHECK: [[C14:%[0-9]+]]:_(s8) = G_CONSTANT i8 2
    ; CHECK: [[C15:%[0-9]+]]:_(s8) = G_CONSTANT i8 1
    ; CHECK: $b0 = COPY [[C]](s8)
    ; CHECK: $b1 = COPY [[C1]](s8)
    ; CHECK: $b2 = COPY [[C2]](s8)
    ; CHECK: $b3 = COPY [[C3]](s8)
    ; CHECK: $b4 = COPY [[C4]](s8)
    ; CHECK: $b5 = COPY [[C5]](s8)
    ; CHECK: $b6 = COPY [[C6]](s8)
    ; CHECK: $b7 = COPY [[C7]](s8)
    ; CHECK: $b8 = COPY [[C8]](s8)
    ; CHECK: $b9 = COPY [[C9]](s8)
    ; CHECK: $b10 = COPY [[C10]](s8)
    ; CHECK: $b11 = COPY [[C11]](s8)
    ; CHECK: $b12 = COPY [[C12]](s8)
    ; CHECK: $b13 = COPY [[C13]](s8)
    ; CHECK: $b14 = COPY [[C14]](s8)
    ; CHECK: $b15 = COPY [[C15]](s8)
    %0:_(s128) = G_CONSTANT i128 1339673755198158349044581307228491536
    %1:_(s8),%2:_(s8),%3:_(s8),%4:_(s8),%5:_(s8),%6:_(s8),%7:_(s8),%8:_(s8),%9:_(s8),%10:_(s8),%11:_(s8),%12:_(s8),%13:_(s8),%14:_(s8),%15:_(s8),%16:_(s8) = G_UNMERGE_VALUES %0(s128)
    $b0 = COPY %1(s8)
    $b1 = COPY %2(s8)
    $b2 = COPY %3(s8)
    $b3 = COPY %4(s8)
    $b4 = COPY %5(s8)
    $b5 = COPY %6(s8)
    $b6 = COPY %7(s8)
    $b7 = COPY %8(s8)
    $b8 = COPY %9(s8)
    $b9 = COPY %10(s8)
    $b10 = COPY %11(s8)
    $b11 = COPY %12(s8)
    $b12 = COPY %13(s8)
    $b13 = COPY %14(s8)
    $b14 = COPY %15(s8)
    $b15 = COPY %16(s8)
...

# Unmerge a constant on a non-power of 2 type into a bunch of smaller constant.
# Constant is a 3 | 2 | 1 in chunks of 13-bit.
---
name:            test_combine_unmerge_cst_36bit
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_cst_36bit
    ; CHECK: [[C:%[0-9]+]]:_(s13) = G_CONSTANT i13 1
    ; CHECK: [[C1:%[0-9]+]]:_(s13) = G_CONSTANT i13 2
    ; CHECK: [[C2:%[0-9]+]]:_(s13) = G_CONSTANT i13 3
    ; CHECK: [[ZEXT:%[0-9]+]]:_(s16) = G_ZEXT [[C]](s13)
    ; CHECK: [[ZEXT1:%[0-9]+]]:_(s16) = G_ZEXT [[C1]](s13)
    ; CHECK: [[ZEXT2:%[0-9]+]]:_(s16) = G_ZEXT [[C2]](s13)
    ; CHECK: $h0 = COPY [[ZEXT]](s16)
    ; CHECK: $h1 = COPY [[ZEXT1]](s16)
    ; CHECK: $h2 = COPY [[ZEXT2]](s16)
    %0:_(s39) = G_CONSTANT i39 201342977
    %1:_(s13),%2:_(s13),%3:_(s13) = G_UNMERGE_VALUES %0(s39)
    %4:_(s16) = G_ZEXT %1(s13)
    %5:_(s16) = G_ZEXT %2(s13)
    %6:_(s16) = G_ZEXT %3(s13)
    $h0 = COPY %4(s16)
    $h1 = COPY %5(s16)
    $h2 = COPY %6(s16)
...

# Unmerge floating point constant.
---
name:            test_combine_unmerge_fpcst
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_fpcst
    ; CHECK: [[C:%[0-9]+]]:_(s16) = G_CONSTANT i16 1
    ; CHECK: [[C1:%[0-9]+]]:_(s16) = G_CONSTANT i16 2
    ; CHECK: [[C2:%[0-9]+]]:_(s16) = G_CONSTANT i16 3
    ; CHECK: [[C3:%[0-9]+]]:_(s16) = G_CONSTANT i16 4
    ; CHECK: $h0 = COPY [[C]](s16)
    ; CHECK: $h1 = COPY [[C1]](s16)
    ; CHECK: $h2 = COPY [[C2]](s16)
    ; CHECK: $h3 = COPY [[C3]](s16)
    %0:_(s64) = G_FCONSTANT double 0x0004000300020001
    %1:_(s16),%2:_(s16),%3:_(s16),%4:_(s16) = G_UNMERGE_VALUES %0(s64)
    $h0 = COPY %1(s16)
    $h1 = COPY %2(s16)
    $h2 = COPY %3(s16)
    $h3 = COPY %4(s16)
...

# Transform unmerge into trunc when only the first definition is live.
---
name:            test_combine_unmerge_dead_to_trunc
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_dead_to_trunc
    ; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
    ; CHECK: [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[COPY]](s64)
    ; CHECK: $h0 = COPY [[TRUNC]](s16)
    %0:_(s64) = COPY $x0
    %1:_(s16),%2:_(s16),%3:_(s16),%4:_(s16) = G_UNMERGE_VALUES %0(s64)
    $h0 = COPY %1(s16)
...

# Don't transform unmerge into trunc when middle lanes are live.
---
name:            test_dont_combine_unmerge_dead_to_trunc
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_dont_combine_unmerge_dead_to_trunc
    ; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
    ; CHECK: [[UV:%[0-9]+]]:_(s16), [[UV1:%[0-9]+]]:_(s16), [[UV2:%[0-9]+]]:_(s16), [[UV3:%[0-9]+]]:_(s16) = G_UNMERGE_VALUES [[COPY]](s64)
    ; CHECK: $h0 = COPY [[UV2]](s16)
    %0:_(s64) = COPY $x0
    %1:_(s16),%2:_(s16),%3:_(s16),%4:_(s16) = G_UNMERGE_VALUES %0(s64)
    $h0 = COPY %3(s16)
...

# Transform unmerge into trunc when only the first definition is live, even
# if the input and output types are vectors.
---
name:            test_combine_unmerge_dead_to_trunc_vec_in_n_out
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_dead_to_trunc_vec_in_n_out
    ; CHECK: [[COPY:%[0-9]+]]:_(<2 x s32>) = COPY $x0
    ; CHECK: [[BITCAST:%[0-9]+]]:_(s64) = G_BITCAST [[COPY]](<2 x s32>)
    ; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[BITCAST]](s64)
    ; CHECK: [[BITCAST1:%[0-9]+]]:_(<2 x s16>) = G_BITCAST [[TRUNC]](s32)
    ; CHECK: $w0 = COPY [[BITCAST1]](<2 x s16>)
    %0:_(<2 x s32>) = COPY $x0
    %1:_(<2 x s16>),%2:_(<2 x s16>) = G_UNMERGE_VALUES %0(<2 x s32>)
    $w0 = COPY %1(<2 x s16>)
...

# Transform unmerge into trunc when only the first definition is live, even
# if the input type is vector.
---
name:            test_combine_unmerge_dead_to_trunc_vec_in
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_dead_to_trunc_vec_in
    ; CHECK: [[COPY:%[0-9]+]]:_(<2 x s32>) = COPY $x0
    ; CHECK: [[BITCAST:%[0-9]+]]:_(s64) = G_BITCAST [[COPY]](<2 x s32>)
    ; CHECK: [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[BITCAST]](s64)
    ; CHECK: $h0 = COPY [[TRUNC]](s16)
    %0:_(<2 x s32>) = COPY $x0
    %1:_(s16),%2:_(s16),%3:_(s16),%4:_(s16) = G_UNMERGE_VALUES %0(<2 x s32>)
    $h0 = COPY %1(s16)
...

# Transform unmerge into trunc when only the first definition is live, even
# if the output type are vector.
---
name:            test_combine_unmerge_dead_to_trunc_vec_out
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_dead_to_trunc_vec_out
    ; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
    ; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s64)
    ; CHECK: [[BITCAST:%[0-9]+]]:_(<2 x s16>) = G_BITCAST [[TRUNC]](s32)
    ; CHECK: $w0 = COPY [[BITCAST]](<2 x s16>)
    %0:_(s64) = COPY $x0
    %1:_(<2 x s16>),%2:_(<2 x s16>) = G_UNMERGE_VALUES %0(s64)
    $w0 = COPY %1(<2 x s16>)
...

# Transform unmerge(zext) into zext.
# In that test, the source of the zext is same size as the first definition
# of the unmerge. Therefore a we can just reuse the input of the zext for
# this definition.
---
name:            test_combine_unmerge_zext_to_zext_same_size
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_zext_to_zext_same_size
    ; CHECK: [[COPY:%[0-9]+]]:_(s32) = COPY $w0
    ; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
    ; CHECK: $w0 = COPY [[COPY]](s32)
    ; CHECK: $w1 = COPY [[C]](s32)
    %0:_(s32) = COPY $w0
    %3:_(s64) = G_ZEXT %0(s32)
    %1:_(s32),%2:_(s32) = G_UNMERGE_VALUES %3(s64)
    $w0 = COPY %1(s32)
    $w1 = COPY %2(s32)
...

# Transform unmerge(zext) into zext.
# In that test, the source of the zext is smaller than the first definition
# of the unmerge. Therefore a G_ZEXT is required.
---
name:            test_combine_unmerge_zext_to_zext
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_combine_unmerge_zext_to_zext
    ; CHECK: [[COPY:%[0-9]+]]:_(s8) = COPY $b0
    ; CHECK: [[ZEXT:%[0-9]+]]:_(s16) = G_ZEXT [[COPY]](s8)
    ; CHECK: [[C:%[0-9]+]]:_(s16) = G_CONSTANT i16 0
    ; CHECK: $h0 = COPY [[ZEXT]](s16)
    ; CHECK: $h1 = COPY [[C]](s16)
    ; CHECK: $h2 = COPY [[C]](s16)
    ; CHECK: $h3 = COPY [[C]](s16)
    %0:_(s8) = COPY $b0
    %3:_(s64) = G_ZEXT %0(s8)
    %1:_(s16),%2:_(s16),%4:_(s16),%5:_(s16) = G_UNMERGE_VALUES %3(s64)
    $h0 = COPY %1(s16)
    $h1 = COPY %2(s16)
    $h2 = COPY %4(s16)
    $h3 = COPY %5(s16)
...

# Check that we don't apply the unmerge(zext) to zext transformation
# when the first destination of the unmerge is smaller than the source
# of the zext.
---
name:            test_dont_combine_unmerge_zext_to_zext_src_bigger
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_dont_combine_unmerge_zext_to_zext_src_bigger
    ; CHECK: [[COPY:%[0-9]+]]:_(s32) = COPY $w0
    ; CHECK: [[ZEXT:%[0-9]+]]:_(s64) = G_ZEXT [[COPY]](s32)
    ; CHECK: [[UV:%[0-9]+]]:_(s16), [[UV1:%[0-9]+]]:_(s16), [[UV2:%[0-9]+]]:_(s16), [[UV3:%[0-9]+]]:_(s16) = G_UNMERGE_VALUES [[ZEXT]](s64)
    ; CHECK: $h0 = COPY [[UV]](s16)
    ; CHECK: $h1 = COPY [[UV1]](s16)
    ; CHECK: $h2 = COPY [[UV2]](s16)
    ; CHECK: $h3 = COPY [[UV3]](s16)
    %0:_(s32) = COPY $w0
    %3:_(s64) = G_ZEXT %0(s32)
    %1:_(s16),%2:_(s16),%4:_(s16),%5:_(s16) = G_UNMERGE_VALUES %3(s64)
    $h0 = COPY %1(s16)
    $h1 = COPY %2(s16)
    $h2 = COPY %4(s16)
    $h3 = COPY %5(s16)
...

# Check that we don't apply the unmerge(zext) to zext transformation
# when the input zext deals with a vector type.
---
name:            test_dont_combine_unmerge_zext_to_zext_src_vector
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_dont_combine_unmerge_zext_to_zext_src_vector
    ; CHECK: [[COPY:%[0-9]+]]:_(<2 x s16>) = COPY $w0
    ; CHECK: [[ZEXT:%[0-9]+]]:_(<2 x s32>) = G_ZEXT [[COPY]](<2 x s16>)
    ; CHECK: [[UV:%[0-9]+]]:_(s32), [[UV1:%[0-9]+]]:_(s32) = G_UNMERGE_VALUES [[ZEXT]](<2 x s32>)
    ; CHECK: $w0 = COPY [[UV]](s32)
    ; CHECK: $w1 = COPY [[UV1]](s32)
    %0:_(<2 x s16>) = COPY $w0
    %3:_(<2 x s32>) = G_ZEXT %0(<2 x s16>)
    %1:_(s32),%2:_(s32) = G_UNMERGE_VALUES %3(<2 x s32>)
    $w0 = COPY %1(s32)
    $w1 = COPY %2(s32)
...

# Check that we don't apply the unmerge(zext) to zext transformation
# when the destination type is a vector type.
# We could actually handle this case but we would need to insert a cast.
---
name:            test_dont_combine_unmerge_zext_to_zext_dst_vector
body:             |
  bb.1:
    ; CHECK-LABEL: name: test_dont_combine_unmerge_zext_to_zext_dst_vector
    ; CHECK: [[COPY:%[0-9]+]]:_(s32) = COPY $w0
    ; CHECK: [[ZEXT:%[0-9]+]]:_(s64) = G_ZEXT [[COPY]](s32)
    ; CHECK: [[UV:%[0-9]+]]:_(<2 x s16>), [[UV1:%[0-9]+]]:_(<2 x s16>) = G_UNMERGE_VALUES [[ZEXT]](s64)
    ; CHECK: $w0 = COPY [[UV]](<2 x s16>)
    ; CHECK: $w1 = COPY [[UV1]](<2 x s16>)
    %0:_(s32) = COPY $w0
    %3:_(s64) = G_ZEXT %0(s32)
    %1:_(<2 x s16>),%2:_(<2 x s16>) = G_UNMERGE_VALUES %3(s64)
    $w0 = COPY %1(<2 x s16>)
    $w1 = COPY %2(<2 x s16>)
...