fbb37e9606
Based on discussion from https://discourse.llvm.org/t/rfc-vectorization-support-for-histogram-count-operations/74788 Current interface is: llvm.experimental.histogram(<vecty> ptrs, <intty> inc_amount, <vecty> mask) The integer type used by 'inc_amount' needs to match the type of the buckets in memory. The intrinsic covers the following operations: * Gather load * histogram on the elements of 'ptrs' * multiply the histogram results by 'inc_amount' * add the result of the multiply to the values loaded by the gather * scatter store the results of the add Supports lowering to histcnt instructions for AArch64 targets, and scalarization for all others at present.
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