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[RISCV][NFC] Clarify getRISCVInstructionCost usage #121556

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Merged
merged 2 commits into from
Feb 3, 2025
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[RISCV][NFC] Clarify getRISCVInstructionCost usage #121556

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9402fbb
[RISCV][TTI] Use vtype for getRISCVInstructionCost
arcbbb Jan 3, 2025
02f633c
Add comments for widening/narrowing instructions
arcbbb Feb 3, 2025
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8 changes: 8 additions & 0 deletions llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,14 @@ class RISCVTTIImpl : public BasicTTIImplBase<RISCVTTIImpl> {
/// actual target hardware.
unsigned getEstimatedVLFor(VectorType *Ty);

/// This function calculates the costs for one or more RVV opcodes based
/// on the vtype and the cost kind.
/// \param Opcodes A list of opcodes of the RVV instruction to evaluate.
/// \param VT The MVT of vtype associated with the RVV instructions.
/// For widening/narrowing instructions where the result and source types
/// differ, it is important to check the spec to determine whether the vtype
/// refers to the result or source type.
/// \param CostKind The type of cost to compute.
InstructionCost getRISCVInstructionCost(ArrayRef<unsigned> OpCodes, MVT VT,
TTI::TargetCostKind CostKind);

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