[PATCH] D137341: [VectorCombine] widen a load with subvector insert

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

Thanks for looking at this!

How useful/feasible would this be to support inserting into a upper subvector as well?

  define <8 x float> @upper(ptr dereferenceable(32) %x) {
    %offset = getelementptr inbounds float, ptr %x, i64 4
    %load = load <4 x float>, ptr %offset, align 4
    %insert = shufflevector <4 x float> undef, <4 x float> %load, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
    ret <8 x float> %insert
  }


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  https://reviews.llvm.org/D137341/new/

https://reviews.llvm.org/D137341