[llvm] [RISCV] Cost UDIV/UREM by a constant power of 2 as a SHL/AND in getArithmeticInstrCost() (PR #179570)

[Craig Topper via llvm-commits]

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@@ -2669,6 +2669,27 @@ RISCVTTIImpl::getIndexedVectorInstrCostFromEnd(unsigned Opcode, Type *Val,
                             nullptr);
 }
 
+std::optional<InstructionCost>
+RISCVTTIImpl::getConvertedArithmeticInstructionCost(
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topperc wrote:

I think you should add a comment. Just reading the name, I don't know what "converted" means.

https://github.com/llvm/llvm-project/pull/179570