[all-commits] [llvm/llvm-project] bb9a57: [SLP] More accurately cost RISCV scalar splats (#2...

[Ryan Buchner via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bb9a57a70d35e36d4c8258cc9a15e5c29041d0d7
      https://github.com/llvm/llvm-project/commit/bb9a57a70d35e36d4c8258cc9a15e5c29041d0d7
  Author: Ryan Buchner <rbuchner at qti.qualcomm.com>
  Date:   2026-09-16 (Wed, 16 Sep 2026)

  Changed paths:
    M llvm/include/llvm/Analysis/TargetTransformInfo.h
    M llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
    M llvm/include/llvm/CodeGen/BasicTTIImpl.h
    M llvm/lib/Analysis/TargetTransformInfo.cpp
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
    M llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h
    M llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
    M llvm/lib/Target/ARM/ARMTargetTransformInfo.h
    M llvm/lib/Target/Hexagon/HexagonTargetTransformInfo.cpp
    M llvm/lib/Target/Hexagon/HexagonTargetTransformInfo.h
    M llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
    M llvm/lib/Target/PowerPC/PPCTargetTransformInfo.h
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
    M llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp
    M llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
    M llvm/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.cpp
    M llvm/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.h
    M llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    M llvm/lib/Target/X86/X86TargetTransformInfo.h
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/lib/Transforms/Vectorize/SLPVectorizer/SLPCostAnalysis.cpp
    M llvm/lib/Transforms/Vectorize/SLPVectorizer/SLPCostAnalysis.h
    M llvm/test/Transforms/SLPVectorizer/RISCV/check-node-without-vector-user.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/folded-broadcast-cost.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/remark-zext-incoming-for-neg-icmp.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/reordered-buildvector-scalars.ll

  Log Message:
  -----------
  [SLP] More accurately cost RISCV scalar splats (#213104)

Backends may have a fast path for splatting scalar operands (i.e. rather
than generating the splat vector, the vector instruction may be able to
take a scalar operand), for example RISCV `vfoo.vx` instructions. Pass a
hint to the TTI when costing the insert/shuffle sequence in such cases.

Fixes #212413.

Assisted By: Codex



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