tree 89d9bbfb93b413ac35bc4f03d89b6d5ec188c3f7
parent 5ff8c036063d83c6eff495de7709b12875113d62
author Simon Pilgrim <llvm-dev@redking.me.uk> 1743493169 +0100
committer GitHub <noreply@github.com> 1743493169 +0100
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[X86] combineINSERT_SUBVECTOR - fold insert_subvector(base,extract_subvector(broadcast)) -> blend shuffle(base,broadcast) (REAPPLIED) (#133724)

If the broadcast is already the full vector width, try to prefer a blend/vshuff64x2 over a vector insertion which is usually lower latency (and sometimes a lower uop count), and reduces changes in vector sizes that can interfere with further combines.

Updated version of #133083 - which lead to infinite loops due to shuffle lowering recreating the INSERT_SUBVECTOR pattern, this variant creates the BLENDI/SHUF128 nodes directly.