[PATCH] D147696: [Assignment Tracking][SROA] Fix fragment when slice size equals variable size

[Orlando Cazalet-Hyams via Phabricator via llvm-commits]

Orlando created this revision.
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Correctly handle the case of splitting an alloca which backs contiguous distinct variables, where a slice's size equals the size of a backed variable.

We need to ensure that we don't generate fragments expressions with fragments of the same size as the variable as this is a verifier error.

Prior to this patch a fragment expression would be created in this situation. e.g. splitting an alloca i64 with two adjacent 32-bit variables into two 32-bit allocas, the new dbg.assign expressions would contain (DW_OP_LLVM_fragment, 0, 32) and (DW_OP_LLVM_fragment, 32, 32) even though those fragments cover each variable entirely.


https://reviews.llvm.org/D147696

Files:
  llvm/lib/Transforms/Scalar/SROA.cpp
  llvm/test/DebugInfo/Generic/assignment-tracking/sroa/var-sized-fragment.ll

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