[PATCH] D153509: [WIP][IR] Add RangeMetadata on top of ExtMetadata

[Nicolai Hähnle via Phabricator via llvm-commits]

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This is an extremely rough draft of a potential change to replace !range
metadata by something implemented on top of ExtMetadata.

That is, replace

  !range !{ i32 5, i32 20 }

by something like

  !range !llvm.range{ ranges: [{ lo: i32 5, hi: i32 20 }] }

Structured data doesn't actually have arrays at the time of writing, so
the draft is limited to a single lo/hi pair. The main point is to show
a concrete example and explore how the ExtMetadata infrastructure is used.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D153509

Files:
  llvm/include/llvm/IR/ExtMetadata.h
  llvm/lib/IR/ConstantRange.cpp
  llvm/lib/IR/ExtMetadata.cpp
  llvm/lib/IR/LLVMContext.cpp
  llvm/lib/IR/MDBuilder.cpp

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