[all-commits] [llvm/llvm-project] 84be95: [RISCV][CostModel] Refine Arithmetic reduction cos...

[Shih-Po Hung via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 84be954cb26ebde58d4ddd2255dfd99904d9ae1b
      https://github.com/llvm/llvm-project/commit/84be954cb26ebde58d4ddd2255dfd99904d9ae1b
  Author: Shih-Po Hung <shihpo.hung at sifive.com>
  Date:   2024-01-25 (Thu, 25 Jan 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/RISCV/reduce-add.ll
    M llvm/test/Analysis/CostModel/RISCV/reduce-and.ll
    M llvm/test/Analysis/CostModel/RISCV/reduce-fadd.ll
    M llvm/test/Analysis/CostModel/RISCV/reduce-or.ll
    M llvm/test/Analysis/CostModel/RISCV/reduce-scalable-fp.ll
    M llvm/test/Analysis/CostModel/RISCV/reduce-scalable-int.ll
    M llvm/test/Analysis/CostModel/RISCV/reduce-xor.ll
    M llvm/test/Analysis/CostModel/RISCV/rvv-intrinsics.ll

  Log Message:
  -----------
  [RISCV][CostModel] Refine Arithmetic reduction costs (#79103)

This patch is split off from #77342

- Correct for CodeSize cost that 1 instruction is not included. 3 is
from {VMV.S, ReductionOp, VMV.X}
- Add SplitCost
Unordered reduction chain a series of VADD/VFADD/... which scales with
LMUL.
 Ordered reductions chain a series of VFREDOSUMs.
- Use MVT to estimate VL.