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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -march=amdgcn -run-pass peephole-opt -verify-machineinstrs -o - %s | FileCheck -check-prefix=GCN %s
# Check that when we jump through several subregisters in sequence of
# reg_sequence we can still find a plain src for a copy.
# In this specific test, we want %4 to read directly from %1 and
# %5 from %0. These values come from the respective chains:
# %4 -> %3.sub0 -> %2.sub1 -> %1
# %5 -> %3.sub1 -> %2.sub0 -> %0
#
# We used to not simplify this because we were bailing when two
# subreg indices were in the same chain (%3.subX and %2.subY)
---
name: reg_sequence_removal
body: |
bb.0:
liveins: $vgpr0, $vgpr1
; GCN-LABEL: name: reg_sequence_removal
; GCN: liveins: $vgpr0, $vgpr1
; GCN-NEXT: {{ $}}
; GCN-NEXT: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN-NEXT: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr1
; GCN-NEXT: [[REG_SEQUENCE:%[0-9]+]]:vreg_64 = REG_SEQUENCE [[COPY]], %subreg.sub0, [[COPY1]], %subreg.sub1
; GCN-NEXT: [[REG_SEQUENCE1:%[0-9]+]]:vreg_64 = REG_SEQUENCE [[REG_SEQUENCE]].sub1, %subreg.sub0, [[REG_SEQUENCE]].sub0, %subreg.sub1
; GCN-NEXT: [[COPY2:%[0-9]+]]:vgpr_32 = COPY [[COPY1]]
; GCN-NEXT: [[COPY3:%[0-9]+]]:vgpr_32 = COPY [[COPY]]
; GCN-NEXT: KILL [[COPY3]], implicit [[COPY2]]
%0:vgpr_32 = COPY $vgpr0
%1:vgpr_32 = COPY $vgpr1
%2:vreg_64 = REG_SEQUENCE %0, %subreg.sub0, %1, %subreg.sub1
%3:vreg_64 = REG_SEQUENCE %2.sub1, %subreg.sub0, %2.sub0, %subreg.sub1
%4:vgpr_32 = COPY %3.sub0
%5:vgpr_32 = COPY %3.sub1
KILL implicit %4, %5
...
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