[PATCH] D54271: [x86] use shuffles for scalar insertion into high elements of a constant vector
Sanjay Patel via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Nov 8 10:37:31 PST 2018
spatel created this revision.
spatel added reviewers: RKSimon, craig.topper.
Herald added a subscriber: mcrosier.
As discussed in https://reviews.llvm.org/D54073, we have a potential regression from more aggressive vector narrowing here, so let's try to avoid that by changing build-vector lowering slightly.
Insert-vector-element lowering always does this since there's no "pinsr" for ymm/zmm:
// If the vector is wider than 128 bits, extract the 128-bit subvector, insert
// into that, and then insert the subvector back into the result.
...but we can sometimes do better for insert-into-constant-vector by using shuffle lowering.
https://reviews.llvm.org/D54271
Files:
lib/Target/X86/X86ISelLowering.cpp
test/CodeGen/X86/insert-into-constant-vector.ll
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