[PATCH] D27103: [Constants] Represent the runtime length of a scalable vector. [IR support for SVE scalable vectors 3/4]

[Paul Walker via llvm-commits]

paulwalker-arm created this revision.
paulwalker-arm added reviewers: hfinkel, mkuper.
paulwalker-arm added a subscriber: llvm-commits.
Herald added a subscriber: mehdi_amini.
Herald added a reviewer: deadalnix.

  The length of a scalable vector is unknown during compilation.  When
  vectorising loops the runtime length is required to update induction
  variables and thus a representation is required within the IR.
  
  This patch introduces the 'vscale' identifier to represent the scaling
  factor 'n' of a scalable vector of the form '<n x #elements x ty>'.
  
  In use, induction variable updates for scalable vectorisation become:
  
    ; i += number_of_elements(<n x 4 x i32)
    %i.next = add i32 %i, mul (i32 vscale, i32 4)


https://reviews.llvm.org/D27103

Files:
  docs/LangRef.rst
  include/llvm-c/Core.h
  include/llvm/Bitcode/LLVMBitCodes.h
  include/llvm/IR/Constants.h
  include/llvm/IR/Value.def
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLParser.h
  lib/AsmParser/LLToken.h
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/IR/AsmWriter.cpp
  lib/IR/Constants.cpp
  lib/IR/LLVMContextImpl.cpp
  lib/IR/LLVMContextImpl.h
  test/Bitcode/compatibility.ll

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