[PATCH] D51640: [DebugInfo] Normalize common kinds of DWARF sub-expressions.

[Jonas Devlieghere via Phabricator via llvm-commits]

JDevlieghere created this revision.
JDevlieghere added reviewers: aprantl, vsk.
JDevlieghere added a project: debug-info.
Herald added a reviewer: javed.absar.
Herald added a subscriber: hiraditya.

Normalize common kinds of DWARF sub-expressions to make debug info encoding a bit more compact:

1. `DW_OP_constu [X < 32]` -> `DW_OP_litX`
2. `DW_OP_constu [all ones]` -> `DW_OP_lit0, DW_OP_not`

Addresses Adrian's comments in https://reviews.llvm.org/D48676.


Repository:
  rL LLVM

https://reviews.llvm.org/D51640

Files:
  llvm/lib/CodeGen/AsmPrinter/DwarfExpression.cpp
  llvm/test/DebugInfo/ARM/PR26163.ll
  llvm/test/DebugInfo/ARM/split-complex.ll
  llvm/test/DebugInfo/Generic/incorrect-variable-debugloc1.ll
  llvm/test/DebugInfo/X86/PR26148.ll
  llvm/test/DebugInfo/X86/constant-loclist.ll
  llvm/test/DebugInfo/X86/partial-constant.ll
  llvm/test/DebugInfo/X86/pieces-4.ll
  llvm/test/DebugInfo/X86/stack-value-piece.ll

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