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microwatt/asic/behavioural/multiply_add_64x64.v

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module multiply_add_64x64
#(
parameter BITS=64
) (
`ifdef USE_POWER_PINS
inout VPWR,
inout VGND,
`endif
input clk,
input [BITS-1:0] a,
input [BITS-1:0] b,
input [BITS*2-1:0] c,
output [BITS*2-1:0] o
);
reg [BITS*2-1:0] o_tmp[2:0];
always @(posedge clk) begin
o_tmp[2] = o_tmp[1];
o_tmp[1] = o_tmp[0];
o_tmp[0] = (a * b) + c;
end
assign o = o_tmp[2];
endmodule