[PATCH] D109757: [StackColoring] Pre-commit of test case showing a debug invariance bug

[Bjorn Pettersson via Phabricator via llvm-commits]

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Having DBG_VALUE instructions referencing a stack slot while being outside
of the LIFETIME_START/LIFETIME_END markers for that stack slot is perhaps
not always ideal (from a debugging perspective), but it might happen during
codegen that we end up with such situations (e.g. positioning of the
DBG_VALUE instruction for a SDDbgOperand::FRAMEIX at ISel is a bit sloppy
in that context).

This patch adds a test case showing that StackColoring currently isn't
debug invariant, and that the position of DBG_VALUE instructions referencing
the stack slots might impact the decision making regarding stack slot reuse.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D109757

Files:
  llvm/test/CodeGen/X86/StackColoring-dbg-invariance.mir

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