[PATCH] D27105: [Constants] Add "stepvector" to represent the sequence 0, 1, 2, 3... [IR support for SVE scalable vectors 4/4]

[Paul Walker via llvm-commits]

paulwalker-arm created this revision.
paulwalker-arm added reviewers: hfinkel, mkuper.
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  [Constants] Add "stepvector" to represent the sequence 0,1,2,3...
  
  The sequence "<i32 0, i32 1, i32 2, i32 3...>" is represented by
  a ConstantVector containing an ArrayRef of all element values.
  For scalable vectors, where the element count is unknown, such a
  representation is impossible.
  
  Instead the complex constant "stepvector" can be used wherever an
  integer vector is expected. This allows the majority of vector
  sequences required for vectorisation to be produced for all vector
  types. Example Usage:
  
    getelementptr i8, i8* %ptr, <n x 4 x i32> stepvector
    getelementptr i8, i8* %ptr, <4 x i32> stepvector
  
  NOTE: The non-scalable vector case will utilise ConstantVector.


https://reviews.llvm.org/D27105

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
  test/Transforms/ConstProp/constant-expr.ll

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