[PATCH] D131967: [RISCV] Correct costs for vector ceil/floor/trunc/round

[Philip Reames via Phabricator via llvm-commits]

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Add vector costs for ceil/floor/trunc/round.  As can be seen in the tests, the prior default costs were a significant under estimate of the actual code generated.

These costs are computed by simply generating code with the current backend, and then counting the number of instructions.  I discount one vsetvli, and ignore the return.

These costs were generated by some simple scripting.  Assuming we're happy with the code structure, I plan to add a bunch more intrinsics using the same approach (in individual reviews).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131967

Files:
  llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
  llvm/test/Analysis/CostModel/RISCV/fround.ll

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