[PATCH] D105280: [2/2][RemoveRedundantDebugValues] Introduce a MIR pass that removes redundant DBG_VALUEs

[Djordje Todorovic via Phabricator via llvm-commits]

djtodoro created this revision.
djtodoro added reviewers: jmorse, Orlando, aprantl, dstenb.
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Herald added subscribers: hiraditya, nemanjai.
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This patch adds the forward scan for finding redundant `DBG_VALUEs`.

This analysis aims to remove redundant `DBG_VALUEs` by going forward
in the basic block by considering the first `DBG_VALUE` as a valid
until its first (location) operand is not clobbered/modified.
For example:

  (1) DBG_VALUE $edi, !"var1", ...
  (2) <block of code that does affect $edi>
  (3) DBG_VALUE $edi, !"var1", ...
   ...

in this case, we can remove (3).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D105280

Files:
  llvm/lib/CodeGen/RemoveRedundantDebugValues.cpp
  llvm/test/CodeGen/PowerPC/non-debug-mi-search-frspxsrsp.ll
  llvm/test/DebugInfo/MIR/X86/remove-redundant-dbg-vals.mir

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