[PATCH] D105390: [X86] Lower insertions into upper half of an 256-bit vector as broadcast+blend (PR50971)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: llvm/lib/Target/X86/X86ISelLowering.cpp:19006
+    // then prefer the broadcast+blend sequence.
+    if (VT.is256BitVector() && IdxVal >= NumEltsIn128 &&
+        ((Subtarget.hasAVX2() && EltVT != MVT::i8) ||
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Maybe generalize the IdxVal >= NumEltsIn128 limit to insert with broadcast if the scalar is already used in a (a) another insertelement/psinrw/pinsrb, (b) scalar_to_vector or (c) broadcast.


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  https://reviews.llvm.org/D105390/new/

https://reviews.llvm.org/D105390