[all-commits] [llvm/llvm-project] 6dba5f: [TTI] Align optional FMFs in getExtendedReductionC...

[Elvis Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6dba5f659567af21a01224845077a269380d8e3a
      https://github.com/llvm/llvm-project/commit/6dba5f659567af21a01224845077a269380d8e3a
  Author: Elvis Wang <elvis.wang at sifive.com>
  Date:   2025-03-19 (Wed, 19 Mar 2025)

  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/ARM/ARMTargetTransformInfo.cpp
    M llvm/lib/Target/ARM/ARMTargetTransformInfo.h
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h

  Log Message:
  -----------
  [TTI] Align optional FMFs in getExtendedReductionCost() to getArithmeticReductionCost(). (#131968)

In the implementation of the getExtendedReductionCost(), it ofter calls
getArithmeticReductionCost() with FMFs. But we shouldn't call
getArithmeticReductionCost() with FMFs for non-floating-point reductions
which will return the wrong cost.

This patch makes FMFs in getExtendedReductionCost() optional and align
to the getArithmeticReductionCost(). So the TTI will return the correct
cost for non-FP extended-reductions query without FMFs.

This patch is not quite NFC but it's hard to test from the CostModel
side.

Split from #113903.



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