[all-commits] [llvm/llvm-project] 218f24: [RISCV] Fix ssub_sat cost model to use signed VSSU...

[Jim Lin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 218f240472086d243ec6a30651e7ea9c2b9b4c8b
      https://github.com/llvm/llvm-project/commit/218f240472086d243ec6a30651e7ea9c2b9b4c8b
  Author: Jim Lin <jim at andestech.com>
  Date:   2026-03-25 (Wed, 25 Mar 2026)

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

  Log Message:
  -----------
  [RISCV] Fix ssub_sat cost model to use signed VSSUB instead of VSSUBU (#188195)

Intrinsic::ssub_sat was incorrectly mapped to RISCV::VSSUBU_VV (unsigned
saturating subtract) instead of RISCV::VSSUB_VV (signed saturating
subtract), causing wrong cost estimates.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply at anthropic.com>



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