[PATCH] D49499: [X86] Prefer unpckhpd over movhlps in isel for fake unary cases

Craig Topper via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Fri Jul 20 10:11:18 PDT 2018


craig.topper added a comment.

@RKSimon what are your thoughts on this patch? Is this ok as is or should we prefer movhlps by default for code size? On Intel CPUs I think they are the same perf. I checked Haswell microcode and they use the same uop with the operands swapped.


https://reviews.llvm.org/D49499





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