[all-commits] [llvm/llvm-project] 7b33b8: [SelectionDAG] Support scalable splats in U(ADD|SU...

[Fraser Cormack via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7b33b849bd337fa68accf6a61e36cb4f0a947af1
      https://github.com/llvm/llvm-project/commit/7b33b849bd337fa68accf6a61e36cb4f0a947af1
  Author: Fraser Cormack <fraser at codeplay.com>
  Date:   2021-07-27 (Tue, 27 Jul 2021)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/RISCV/rvv/combine-sats.ll

  Log Message:
  -----------
  [SelectionDAG] Support scalable splats in U(ADD|SUB)SAT combines

This patch builds on top of D106575 in which scalable-vector splats were
supported in `ISD::matchBinaryPredicate`. It teaches the DAGCombiner how
to perform a variety of the pre-existing saturating add/sub combines on
scalable-vector types.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D106652