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1# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 42# RUN: llc -mtriple=x86_64-pc-linux-gnu -run-pass=register-coalescer -verify-coalescing -o - %s | FileCheck %s3 4# Check for "Live range continues after dead def flag".5 6# There are 2 copies of undef, but the registers also appear to be7# live due to block live outs, and thus were not deleted as8# eliminateUndefCopy only considered the live range, and not the undef9# flag.10#11# removePartialRedundancy would move the COPY undef %0 in bb.1 to12# bb.0. The live range of %1 would then be extended to be live out of13# %bb.1 for the backedge phi. This would then fail the verifier, since14# the dead flag was no longer valid. This was fixed by directly15# considering the undef flag to avoid considering this special case.16 17---18name: partial_redundancy_coalesce_undef_copy_live_out19tracksRegLiveness: true20body: |21 ; CHECK-LABEL: name: partial_redundancy_coalesce_undef_copy_live_out22 ; CHECK: bb.0:23 ; CHECK-NEXT: successors: %bb.1(0x80000000)24 ; CHECK-NEXT: liveins: $rdi25 ; CHECK-NEXT: {{ $}}26 ; CHECK-NEXT: [[COPY:%[0-9]+]]:gr32 = COPY $rdi27 ; CHECK-NEXT: {{ $}}28 ; CHECK-NEXT: bb.1:29 ; CHECK-NEXT: successors: %bb.1(0x80000000)30 ; CHECK-NEXT: {{ $}}31 ; CHECK-NEXT: dead [[XOR32ri:%[0-9]+]]:gr32 = XOR32ri undef [[XOR32ri]], 1, implicit-def dead $eflags32 ; CHECK-NEXT: dead [[MOV32rr:%[0-9]+]]:gr32 = MOV32rr [[COPY]]33 ; CHECK-NEXT: [[COPY:%[0-9]+]]:gr32 = IMPLICIT_DEF34 ; CHECK-NEXT: JMP_1 %bb.135 bb.0:36 liveins: $rdi37 38 %0:gr32 = COPY $rdi39 40 bb.1:41 %1:gr32 = COPY undef %042 dead %1:gr32 = XOR32ri %1, 1, implicit-def dead $eflags43 dead %2:gr32 = MOV32rr killed %044 %0:gr32 = COPY killed undef %145 JMP_1 %bb.146 47...48