[all-commits] [llvm/llvm-project] ca0cd6: [RISCV] Improve SK_Reverse shuffle costs for fixed...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ca0cd670dcf13c152db0a69ef14037ff19be9b29
      https://github.com/llvm/llvm-project/commit/ca0cd670dcf13c152db0a69ef14037ff19be9b29
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2023-03-13 (Mon, 13 Mar 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/RISCV/shuffle-reverse.ll

  Log Message:
  -----------
  [RISCV] Improve SK_Reverse shuffle costs for fixed length vectors

As noted by @luke (https://reviews.llvm.org/D145953#inline-1409312), we were accounting for the cost of vector element size using vlenb whereas the expression can be constant folded for fixed length vectors.

Differential Revision: https://reviews.llvm.org/D145973