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Matt Arsenault 87117a2e20 MachineVerifier: Add tests which are incorrectly accepted

In the process of splitting out the liveness tracking, I ran into
these cases which should have been caught. There are still missing
errors for some cases in the entry block.

https://reviews.llvm.org/D127104

2023-09-01 09:06:57 -04:00

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 # XFAIL: *
 # REQUIRES: amdgpu-registered-target
 # RUN: not --crash llc -o - -mtriple=amdgcn-amd-amdhsa -run-pass=none -verify-machineinstrs %s
  # FIXME: This should catch the undefined use of %0
 ---
 name:            undef_virtreg
 body:             |
   bb.0:
     S_ENDPGM 0, implicit %0:sreg_32
 ...