[PATCH] D128192: [GlobalISel][DebugInfo] Propagate debug location for localized constants

[Vladislav Dzhidzhoev via Phabricator via llvm-commits]

dzhidzhoev created this revision.
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After IRTranslator pass, constants are deduplicated and translated into instructions at entry block, having debug locations lost.
Localization of constants may cause emission of extra zero lines in debug_line section, like here https://godbolt.org/z/ecvsxxfKn. In this example, constant gets placed as
a first instruction in entry block, and despite it has no debug location, AsmPrinter emits zero line for it.

If a localized constant has the only user, we can assume that it has the same debug location as its user, since they are placed consequently.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128192

Files:
  llvm/lib/CodeGen/GlobalISel/Localizer.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/localizer-propagate-debug-loc.mir

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