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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-coalescing -run-pass=register-coalescer -o - %s | FileCheck %s
# Check that there's no "Live segment doesn't end at a valid
# instruction" failure after coalescing %0 into %2, which is
# ultimately a pair of dead copies.
---
name: coalesce_into_dead_subreg_copy
tracksRegLiveness: true
machineFunctionInfo:
isEntryFunction: true
scratchRSrcReg: '$sgpr0_sgpr1_sgpr2_sgpr3'
stackPtrOffsetReg: '$sgpr32'
occupancy: 8
body: |
; CHECK-LABEL: name: coalesce_into_dead_subreg_copy
; CHECK: bb.0:
; CHECK-NEXT: successors: %bb.1(0x80000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: dead [[S_LOAD_DWORDX2_IMM:%[0-9]+]]:sreg_64_xexec = S_LOAD_DWORDX2_IMM undef %1:sgpr_64, 24, 0 :: (dereferenceable invariant load (s64), addrspace 4)
; CHECK-NEXT: S_BRANCH %bb.1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.1:
bb.0:
%0:sreg_64_xexec = S_LOAD_DWORDX2_IMM undef %1:sgpr_64, 24, 0 :: (dereferenceable invariant load (s64), addrspace 4)
undef %2.sub0:sreg_64 = COPY %0.sub0:sreg_64_xexec
%2.sub1:sreg_64 = COPY killed %0.sub1:sreg_64_xexec
S_BRANCH %bb.1
bb.1:
...
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