[all-commits] [llvm/llvm-project] 055ac7: [GISel] Add support for scalable vectors in getLCM...

[Michael Maitland via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 055ac72ecca4b56826ac02851f8a18f20a8557df
      https://github.com/llvm/llvm-project/commit/055ac72ecca4b56826ac02851f8a18f20a8557df
  Author: Michael Maitland <michaeltmaitland at gmail.com>
  Date:   2024-02-06 (Tue, 06 Feb 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/Utils.h
    M llvm/lib/CodeGen/GlobalISel/Utils.cpp
    M llvm/unittests/CodeGen/GlobalISel/GISelUtilsTest.cpp

  Log Message:
  -----------
  [GISel] Add support for scalable vectors in getLCMType (#80306)

This function can be called from buildCopyToRegs where at least one of
the types is a scalable vector type. This function crashed because it
did not know how to handle scalable vector types.

This patch extends the functionality of getLCMType to handle when at
least one of the types is a scalable vector. getLCMType between a fixed
and scalable vector is not implemented since the docstring of the
function explains that getLCMType is used to build MERGE/UNMERGE
instructions and we will never build a MERGE/UNMERGE between fixed and
scalable vectors.