[PATCH] D63517: [x86] avoid vector load narrowing with extracted store uses (PR42305)

[Sanjay Patel via Phabricator via llvm-commits]

spatel created this revision.
spatel added reviewers: RKSimon, craig.topper.
Herald added subscribers: hiraditya, mcrosier.
Herald added a project: LLVM.

This is an exception to the rule that we should prefer xmm ops to ymm ops. As shown in PR42305:
https://bugs.llvm.org/show_bug.cgi?id=42305
...the store folding opportunity with vextractf128 may result in better perf by reducing the instruction count.


https://reviews.llvm.org/D63517

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/sandybridge-loads.ll
  llvm/test/CodeGen/X86/widen_load-3.ll

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