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

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: leonardchan, spatel, nikic.
Herald added a project: LLVM.

Based on an IR equivalent of target lowering's generic expansion - target specific costs will typically be lower (IR doesn't have a good mull/mulh equivalent) but we need a baseline.

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


Repository:
  rL LLVM

https://reviews.llvm.org/D57925

Files:
  include/llvm/CodeGen/BasicTTIImpl.h
  test/Analysis/CostModel/X86/arith-fix.ll

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