[all-commits] [llvm/llvm-project] 465e3c: [LLVM][CodeGen] Lower ConstantInt vectors like shu...

[Paul Walker via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 465e3ce9f10019db071dc7794ae9ab22f9fc76f7
      https://github.com/llvm/llvm-project/commit/465e3ce9f10019db071dc7794ae9ab22f9fc76f7
  Author: Paul Walker <paul.walker at arm.com>
  Date:   2025-06-17 (Tue, 17 Jun 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
    M llvm/test/CodeGen/AArch64/sve-expand-div.ll
    M llvm/test/CodeGen/AArch64/sve-fixed-length-sdiv-pow2.ll
    M llvm/test/CodeGen/AArch64/sve-sdiv-pow2.ll

  Log Message:
  -----------
  [LLVM][CodeGen] Lower ConstantInt vectors like shufflevector base splats. (#144395)

ConstantInt vectors utilise DAG.getConstant() when constructing the
initial DAG. This can have the effect of legalising the constant before
the DAG combiner is run, significant altering the generated code. To
mitigate this (hopefully as a temporary measure) we instead try to
construct the DAG in the same way as shufflevector based splats.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications