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If we're concatenating several smaller loads separated by a stride, we can try and increase the element size and perform a strided load. For example: ``` concat_vectors (load v4i8, p+0), (load v4i8, p+n), (load v4i8, p+n*2), (load v4i8, p+n*3) => vlse32 p, stride=n, VL=4 ``` This pattern can be produced by the SLP vectorizer. A special case is when the stride is exactly equal to the width of the vector, in which case it can be converted into a single consecutive vector load. For example: ``` concat_vectors (load v4i8, p), (load v4i8, p+4), (load v4i8, p+8), (load v4i8, p+12) => vle8 p, VL=16 ``` Reviewed By: craig.topper Differential Revision: https://reviews.llvm.org/D147713
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