[all-commits] [llvm/llvm-project] 399865: [X86] combineConcatVectorOps - concat per-lane v2f...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 399865cbf02a323cba7910eeb1462feaf07c67dd
      https://github.com/llvm/llvm-project/commit/399865cbf02a323cba7910eeb1462feaf07c67dd
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-06-06 (Fri, 06 Jun 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-interleaved-store-i64-stride-2.ll

  Log Message:
  -----------
  [X86] combineConcatVectorOps - concat per-lane v2f64/v4f64 shuffles into vXf64 vshufpd (#143017)

We can always concatenate v2f64/v4f64 per-lane shuffles into a single vshufpd instruction, assuming we can profitably concatenate at least one of its operands (or its an unary shuffle).

I was really hoping to get this into combineX86ShufflesRecursively but it still can't handle concatenation/length changing as well as combineConcatVectorOps.



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