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1# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py2# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-coalescing -run-pass=register-coalescer -o - %s | FileCheck %s3 4# Check that there's no "Live segment doesn't end at a valid5# instruction" failure after coalescing %0 into %2, which is6# ultimately a pair of dead copies.7 8---9name: coalesce_into_dead_subreg_copy10tracksRegLiveness: true11machineFunctionInfo:12 isEntryFunction: true13 scratchRSrcReg: '$sgpr0_sgpr1_sgpr2_sgpr3'14 stackPtrOffsetReg: '$sgpr32'15 occupancy: 816body: |17 ; CHECK-LABEL: name: coalesce_into_dead_subreg_copy18 ; CHECK: bb.0:19 ; CHECK-NEXT: successors: %bb.1(0x80000000)20 ; CHECK-NEXT: {{ $}}21 ; 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)22 ; CHECK-NEXT: S_BRANCH %bb.123 ; CHECK-NEXT: {{ $}}24 ; CHECK-NEXT: bb.1:25 bb.0:26 %0:sreg_64_xexec = S_LOAD_DWORDX2_IMM undef %1:sgpr_64, 24, 0 :: (dereferenceable invariant load (s64), addrspace 4)27 undef %2.sub0:sreg_64 = COPY %0.sub0:sreg_64_xexec28 %2.sub1:sreg_64 = COPY killed %0.sub1:sreg_64_xexec29 S_BRANCH %bb.130 31 bb.1:32 33...34