[PATCH] D67875: [X86] X86DAGToDAGISel::matchBEXTRFromAndImm(): if can't use BEXTR, fallback to BZHI (PR43381)
    Craig Topper via Phabricator via llvm-commits 
    llvm-commits at lists.llvm.org
       
    Sun Sep 22 13:07:22 PDT 2019
    
    
  
craig.topper added a comment.
What if we just do the larger than 32-bit mask? Its not clear that making BZHI just to fold a load is an improvement. You have to materialize an immediate instead so the total uops increased.
Repository:
  rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D67875/new/
https://reviews.llvm.org/D67875
    
    
More information about the llvm-commits
mailing list