- // Todo: AVX512 allows gather/scatter, works with strided and random as well
- if ((DataWidth < 32) || (Consecutive == 0))
+bool X86TTIImpl::isLegalMaskedGather(Type *DataTy) {
+ // This function is called now in two cases: from the Loop Vectorizer
+ // and from the Scalarizer.
+ // When the Loop Vectorizer asks about legality of the feature,
+ // the vectorization factor is not calculated yet. The Loop Vectorizer
+ // sends a scalar type and the decision is based on the width of the
+ // scalar element.
+ // Later on, the cost model will estimate usage this intrinsic based on
+ // the vector type.
+ // The Scalarizer asks again about legality. It sends a vector type.
+ // In this case we can reject non-power-of-2 vectors.
+ if (isa<VectorType>(DataTy) && !isPowerOf2_32(DataTy->getVectorNumElements()))