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Hello LLVMdev, Our processor has mac (multiply and accumulate) instructions which takes the accumulator register (acc) as an implicit operand. This is different from typical three or four operands mac instructions. As an illustration, the following instructions compute a + b x c + e x f + g *h. initacc a //initialize the accumulator register fmac b c fmac e f fmac g h mfacc i //move result from the accumulator register to register i A straightforward implementation is to find the patterns in selectionDAG and turn them into mac instructions cha...