[all-commits] [llvm/llvm-project] a67420: [RISCV][TTI] Model the cost of insert/extractelt w...

[Elvis Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a6742094324d7166b451c749acf81d27a504c47b
      https://github.com/llvm/llvm-project/commit/a6742094324d7166b451c749acf81d27a504c47b
  Author: Elvis Wang <elvis.wang at sifive.com>
  Date:   2024-12-12 (Thu, 12 Dec 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/RISCV/rvv-extractelement.ll
    M llvm/test/Analysis/CostModel/RISCV/rvv-insertelement.ll

  Log Message:
  -----------
  [RISCV][TTI] Model the cost of insert/extractelt when the vector split into multiple register group and idx exceed single group. (#118401)

This patch implements the cost when the size of the vector need to split
into multiple groups and the index exceed single vector group.

For extract element, we need to store split vectors to stack and load
the target element.
For insert element, we need to store split vectors to stack and store
the target element and load vectors back.

After this patch, the cost of insert/extract element will close to the
generated assembly.



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