[PATCH] D108253: [WIP][X86] Introduce 'blend with broadcast' shuffle lowering strategy (PR50971)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: llvm/lib/Target/X86/X86ISelLowering.cpp:17293
   if (isShuffleMaskInputInPlace(0, Mask) || isShuffleMaskInputInPlace(1, Mask))
     return lowerShuffleAsDecomposedShuffleMerge(DL, MVT::v4f64, V1, V2, Mask,
                                                 Subtarget, DAG);
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We're doing something very similar here as well - but I have a suspicion that the lowerShuffleAsLanePermuteAndSHUFP is placed very specifically .....


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  https://reviews.llvm.org/D108253/new/

https://reviews.llvm.org/D108253