[llvm-bugs] [Bug 26183] Combining unary integer shuffles to PSHUFB

via llvm-bugs llvm-bugs at lists.llvm.org
Sun Dec 31 10:24:09 PST 2017


Simon Pilgrim <llvm-dev at redking.me.uk> changed:

           What    |Removed                     |Added
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #5 from Simon Pilgrim <llvm-dev at redking.me.uk> ---
(In reply to Simon Pilgrim from comment #4)
> Agreed, the MachineCombiner pass looks like a good option for scheduler
> driven combines.
> My only concern is if we end up with a lot of code duplication with the
> existing x86 target shuffle combines.

Resolving this as a number of patches have now covered PSHUFB combining
(including the fast-variable-shuffle attribute).

I've created Bug #35784 for the scheduler driven optimization conversation.

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