[PATCH] D57925: [TTI] Add generic cost model for fixed point smul/umul

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

> An alternative would be to assume the mull/mulh cost is the same as 2 * mul - what do people think?

Would it be possible to add a separate method for getting the widening multiplication cost, defaulting to your current implementation? It would come in handy for MULO cost modeling as well. And probably more likely to receive a good target-specific implementation than the full smul.fix intrinsics.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D57925/new/

https://reviews.llvm.org/D57925