[PATCH] D105390: [X86] Lower insertions into non-0'th 128-bit subvector as broadcast+blend (PR50971)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In D105390#2856736 <https://reviews.llvm.org/D105390#2856736>, @RKSimon wrote:

> I think the premise is sound, but creating variable shuffle/blend masks isn't great - its also uncovering a number of other poor codegen issues that need addressing.

My main question is, presumably we only want to do this iff that is the only insertion into that 128-bit-wide subreg?


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https://reviews.llvm.org/D105390