[all-commits] [llvm/llvm-project] 153b84: [RISCV][GISEL] Legalize G_BITCAST for scalable vec...

[Michael Maitland via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 153b8431bbea189f9698ddaf08dbedca4c24a918
      https://github.com/llvm/llvm-project/commit/153b8431bbea189f9698ddaf08dbedca4c24a918
  Author: Michael Maitland <michaeltmaitland at gmail.com>
  Date:   2024-04-02 (Tue, 02 Apr 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp
    A llvm/test/CodeGen/RISCV/GlobalISel/legalizer/rvv/legalize-bitcast.mir

  Log Message:
  -----------
  [RISCV][GISEL] Legalize G_BITCAST for scalable vectors (#85970)

SelectionDAG marks ISD::BITCAST as legal between scalable vector types
and ISelDAGToDAG deletes them.

We mark G_BITCAST between scalable vectors as legal in GISel. A future
patch will handle what to do with them after the legalizer (likley
either drop them in a isel-preprocess or convert them to COPYs).

BITCAST is needed for legalization of G_INSERT and G_EXTRACT. This is a
precommit for legalization of G_INSERT and G_EXTRACT.



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