OpenPower,xeon phi for one; Even within the amd64 and arm families, there are enough variations (AArch vs qualcomm) and evolutions (SSE3 to SSE4) to make the t

OpenPower,xeon phi for one; Even within the amd64 and arm families, there are enough variations (AArch vs qualcomm) and evolutions (SSE3 to SSE4) to make the task of developing a new and performant backend from scratch very resource consuming Also while taken individually most of the non amd64/arm platforms might not be significant, combine together they still represent a big share of the pie, doubly more so in the embedded world which rust (tries?) to target.