[all-commits] [llvm/llvm-project] fc8974: [RISCV][NFC] Clarify getRISCVInstructionCost usage...

[Shih-Po Hung via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fc897450019bc0585f3592ee3a3d68bad2fdcbbc
      https://github.com/llvm/llvm-project/commit/fc897450019bc0585f3592ee3a3d68bad2fdcbbc
  Author: Shih-Po Hung <shihpo.hung at sifive.com>
  Date:   2025-02-03 (Mon, 03 Feb 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h

  Log Message:
  -----------
  [RISCV][NFC] Clarify getRISCVInstructionCost usage (#121556)

This patch adds a comment to explicitly state that
getRISCVInstructionCost uses vtype associated with widening and
narrowing instructions.
For example, vtype = (SEW):
For vfwcvt.f.f.v, the source is (SEW), the destination is (2 * SEW)
For vfncvt.f.f.w, the source is (2 * SEW), the destination is (SEW).
In these cases, the type passed to `getRISCVInstructionCost` differs
- The source type is used for `vfwcvt.f.f.v`.
- The destination type is used for `vfncvt.f.f.w`.



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