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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 4
# RUN: llc -mtriple=x86_64-pc-linux-gnu -run-pass=register-coalescer -verify-coalescing -o - %s | FileCheck %s
# Check for "Live range continues after dead def flag".
# There are 2 copies of undef, but the registers also appear to be
# live due to block live outs, and thus were not deleted as
# eliminateUndefCopy only considered the live range, and not the undef
# flag.
#
# removePartialRedundancy would move the COPY undef %0 in bb.1 to
# bb.0. The live range of %1 would then be extended to be live out of
# %bb.1 for the backedge phi. This would then fail the verifier, since
# the dead flag was no longer valid. This was fixed by directly
# considering the undef flag to avoid considering this special case.
---
name: partial_redundancy_coalesce_undef_copy_live_out
tracksRegLiveness: true
body: |
; CHECK-LABEL: name: partial_redundancy_coalesce_undef_copy_live_out
; CHECK: bb.0:
; CHECK-NEXT: successors: %bb.1(0x80000000)
; CHECK-NEXT: liveins: $rdi
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:gr32 = COPY $rdi
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.1:
; CHECK-NEXT: successors: %bb.1(0x80000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: dead [[XOR32ri:%[0-9]+]]:gr32 = XOR32ri undef [[XOR32ri]], 1, implicit-def dead $eflags
; CHECK-NEXT: dead [[MOV32rr:%[0-9]+]]:gr32 = MOV32rr [[COPY]]
; CHECK-NEXT: [[COPY:%[0-9]+]]:gr32 = IMPLICIT_DEF
; CHECK-NEXT: JMP_1 %bb.1
bb.0:
liveins: $rdi
%0:gr32 = COPY $rdi
bb.1:
%1:gr32 = COPY undef %0
dead %1:gr32 = XOR32ri %1, 1, implicit-def dead $eflags
dead %2:gr32 = MOV32rr killed %0
%0:gr32 = COPY killed undef %1
JMP_1 %bb.1
...
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