[all-commits] [llvm/llvm-project] 59f05b: [RISCV][TTI] Model cost for insert/extract into il...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 59f05b683def5ef728baf8c4ae8f846e957ad67f
      https://github.com/llvm/llvm-project/commit/59f05b683def5ef728baf8c4ae8f846e957ad67f
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2024-08-29 (Thu, 29 Aug 2024)

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

  Log Message:
  -----------
  [RISCV][TTI] Model cost for insert/extract into illegal types (#106440)

We'd previously just deferred to the base implementation, but that more
or less always returns 1. This underestimates the cost of the
insert/extract, biases the SLP vectorizer towards forming illegally
typed vectors, and underestimates the cost of scalarized operations
(like unaligned scatter/gather).



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