File: PHIElimination-crash.mir

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llvm-toolchain-20 1%3A20.1.8-1
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# RUN: llc -mtriple=aarch64-linux-gnu -verify-machineinstrs -o /dev/null %s \
# RUN:   -run-pass=livevars,phi-node-elimination,twoaddressinstruction \
# RUN:   -no-phi-elim-live-out-early-exit=1 -phi-elim-split-all-critical-edges=1
# RUN: llc -mtriple=aarch64-linux-gnu -verify-each -o /dev/null %s \
# RUN:   --passes='require<live-vars>,phi-node-elimination,two-address-instruction' \
# RUN:   -no-phi-elim-live-out-early-exit=1 -phi-elim-split-all-critical-edges=1

# Used to result in
#
#     *** Bad machine code: LiveVariables: Block should not be in AliveBlocks ***
#
# Just verify that we do not crash (or get verifier error).

---
name: test
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $nzcv, $wzr
    Bcc 8, %bb.2, implicit $nzcv

  bb.1:
    %x:gpr32 = COPY $wzr

  bb.2:
    %y:gpr32 = PHI %x:gpr32, %bb.1, undef %undef:gpr32, %bb.0
    $wzr = COPY %y:gpr32
...