[Benchmark] Add more micro benchmarks for mac ranging from 8 bit to 32 bit

openfpga_flow/benchmarks/micro_benchmark/mac/mac_12/mac_12.v

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+//-------------------------------------------------------
+//  Functionality: A 12-bit multiply-acculumate circuit
+//  Author:        Xifan Tang
+//-------------------------------------------------------
+
+module mac_12(a, b, c, out);
+parameter DATA_WIDTH = 12;  /* declare a parameter. default required */
+input [DATA_WIDTH - 1 : 0] a, b, c;
+output [DATA_WIDTH - 1 : 0] out;
+
+assign out = a * b + c;
+
+endmodule
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openfpga_flow/benchmarks/micro_benchmark/mac/mac_16/mac_16.v

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+//-------------------------------------------------------
+//  Functionality: A 16-bit multiply-acculumate circuit
+//  Author:        Xifan Tang
+//-------------------------------------------------------
+
+module mac_16(a, b, c, out);
+parameter DATA_WIDTH = 16;  /* declare a parameter. default required */
+input [DATA_WIDTH - 1 : 0] a, b, c;
+output [DATA_WIDTH - 1 : 0] out;
+
+assign out = a * b + c;
+
+endmodule
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openfpga_flow/benchmarks/micro_benchmark/mac/mac_32/mac_32.v

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+//-------------------------------------------------------
+//  Functionality: A 32-bit multiply-acculumate circuit
+//  Author:        Xifan Tang
+//-------------------------------------------------------
+
+module mac_32(a, b, c, out);
+parameter DATA_WIDTH = 32;  /* declare a parameter. default required */
+input [DATA_WIDTH - 1 : 0] a, b, c;
+output [DATA_WIDTH - 1 : 0] out;
+
+assign out = a * b + c;
+
+endmodule
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