[MLIR][Vector] Allow any strided memref for one-element vector.load in lowering vector.gather (#122437) In `Gather1DToConditionalLoads`, currently we will check if the stride of the most minor dim of the input memref is 1. And if not, the rewriting pattern will not be applied. However, according to the verification of `vector.load` here: https://github.com/llvm/llvm-project/blob/4e32271e8b304eb018c69f74c16edd1668fcdaf3/mlir/lib/Dialect/Vector/IR/VectorOps.cpp#L4971-L4975 .. if the output vector type of `vector.load` contains only one element, we can ignore the requirement of the stride of the input memref, i.e. the input memref can be with any stride layout attribute in such case. So here we can allow more cases in lowering `vector.gather` by relaxing such check. As shown in the test case attached in this patch [here](https://github.com/llvm/llvm-project/blob/1933fbad58302814ccce5991a9320c0967f3571b/mlir/test/Dialect/Vector/vector-gather-lowering.mlir#L151), now `vector.gather` of memref with non-trivial stride can be lowered successfully if the result vector contains only one element. --------- Signed-off-by: PragmaTwice <twice@apache.org> Co-authored-by: Andrzej Warzyński <andrzej.warzynski@gmail.com>
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