[llvm] [RISCV][TTI] Recognize CONCAT_VECTORS if a shufflevector mask is multiple insert subvector. (PR #111459)
Craig Topper via llvm-commits
llvm-commits at lists.llvm.org
Mon Oct 7 17:42:29 PDT 2024
================
@@ -343,6 +343,49 @@ RISCVTTIImpl::getConstantPoolLoadCost(Type *Ty, TTI::TargetCostKind CostKind) {
/*AddressSpace=*/0, CostKind);
}
+InstructionCost
+RISCVTTIImpl::isMultipleInsertSubvector(VectorType *Tp, ArrayRef<int> Mask,
+ TTI::TargetCostKind CostKind) {
+ if (!isa<FixedVectorType>(Tp))
+ return InstructionCost::getInvalid();
+ std::pair<InstructionCost, MVT> LT = getTypeLegalizationCost(Tp);
+ if (LT.second.getScalarSizeInBits() == 1)
+ return InstructionCost::getInvalid();
+ // Try to guess SubTp.
+ for (unsigned SubVecSize = 1, E = Mask.size(); SubVecSize < E;
+ SubVecSize <<= 1) {
+ if (E % SubVecSize != 0)
----------------
topperc wrote:
Would it be sufficient to check that Mask.size() is a power 2 before the loop since SubVecSize can only be a power 2.
https://github.com/llvm/llvm-project/pull/111459
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