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[SVE][IR] Scalable Vector IR Type

Authored by huntergr on May 29 2019, 5:22 AM.

Description

[SVE][IR] Scalable Vector IR Type

  • Adds a 'scalable' flag to VectorType
  • Adds an 'ElementCount' class to VectorType to pass (possibly scalable) vector lengths, with overloaded operators.
  • Modifies existing helper functions to use ElementCount
  • Adds support for serializing/deserializing to/from both textual and bitcode IR formats
  • Extends the verifier to reject global variables of scalable types
  • Updates documentation

See the latest version of the RFC here: http://lists.llvm.org/pipermail/llvm-dev/2018-July/124396.html

Reviewers: rengolin, lattner, echristo, chandlerc, hfinkel, rkruppe, samparker, SjoerdMeijer, greened, sebpop

Reviewed By: hfinkel, sebpop

Differential Revision: https://reviews.llvm.org/D32530

llvm-svn: 361953