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# the dead flag was no longer valid.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