llvm/test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-concat-vectors.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -O0 -mtriple=amdgcn-mesa-mesa3d -mcpu=gfx900 -run-pass=legalizer %s -o - | FileCheck -check-prefix=GFX9 %s

# The G_SHL will be split into <2 x s16>, introducing a
# G_UNMERGE_VALUES of G_CONCAT_VECTORS. The artifact combiner should
# eliminate the pair.
---
name: revisit_concat_vectors_unmerge_user
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0_vgpr1

    ; GFX9-LABEL: name: revisit_concat_vectors_unmerge_user
    ; GFX9: liveins: $vgpr0_vgpr1
    ; GFX9-NEXT: {{  $}}
    ; GFX9-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GFX9-NEXT: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 8
    ; GFX9-NEXT: [[LSHR:%[0-9]+]]:_(s32) = G_LSHR [[COPY]], [[C]](s32)
    ; GFX9-NEXT: [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 16
    ; GFX9-NEXT: [[LSHR1:%[0-9]+]]:_(s32) = G_LSHR [[COPY]], [[C1]](s32)
    ; GFX9-NEXT: [[C2:%[0-9]+]]:_(s32) = G_CONSTANT i32 24
    ; GFX9-NEXT: [[LSHR2:%[0-9]+]]:_(s32) = G_LSHR [[COPY]], [[C2]](s32)
    ; GFX9-NEXT: [[TRUNC:%[0-9]+]]:_(s16) = G_TRUNC [[COPY]](s32)
    ; GFX9-NEXT: [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[LSHR]](s32)
    ; GFX9-NEXT: [[TRUNC2:%[0-9]+]]:_(s16) = G_TRUNC [[LSHR1]](s32)
    ; GFX9-NEXT: [[TRUNC3:%[0-9]+]]:_(s16) = G_TRUNC [[LSHR2]](s32)
    ; GFX9-NEXT: [[C3:%[0-9]+]]:_(s16) = G_CONSTANT i16 2
    ; GFX9-NEXT: [[BUILD_VECTOR:%[0-9]+]]:_(<2 x s16>) = G_BUILD_VECTOR [[C3]](s16), [[C3]](s16)
    ; GFX9-NEXT: [[BUILD_VECTOR1:%[0-9]+]]:_(<2 x s16>) = G_BUILD_VECTOR [[C3]](s16), [[C3]](s16)
    ; GFX9-NEXT: [[BUILD_VECTOR2:%[0-9]+]]:_(<2 x s16>) = G_BUILD_VECTOR [[TRUNC]](s16), [[TRUNC1]](s16)
    ; GFX9-NEXT: [[BUILD_VECTOR3:%[0-9]+]]:_(<2 x s16>) = G_BUILD_VECTOR [[TRUNC2]](s16), [[TRUNC3]](s16)
    ; GFX9-NEXT: [[SHL:%[0-9]+]]:_(<2 x s16>) = G_SHL [[BUILD_VECTOR2]], [[BUILD_VECTOR]](<2 x s16>)
    ; GFX9-NEXT: [[SHL1:%[0-9]+]]:_(<2 x s16>) = G_SHL [[BUILD_VECTOR3]], [[BUILD_VECTOR1]](<2 x s16>)
    ; GFX9-NEXT: [[CONCAT_VECTORS:%[0-9]+]]:_(<4 x s16>) = G_CONCAT_VECTORS [[SHL]](<2 x s16>), [[SHL1]](<2 x s16>)
    ; GFX9-NEXT: $vgpr0_vgpr1 = COPY [[CONCAT_VECTORS]](<4 x s16>)
    %0:_(s32) = COPY $vgpr0
    %1:_(<4 x s8>) = G_BITCAST %0
    %2:_(s16) = G_CONSTANT i16 2
    %3:_(<4 x s16>) = G_BUILD_VECTOR %2, %2, %2, %2
    %4:_(<4 x s16>) = G_ANYEXT %1
    %5:_(<4 x s16>) = G_SHL %4, %3
    $vgpr0_vgpr1 = COPY %5
...