[Benchmark] Added multiple adder benchmarks to have better coverage in testing FPGA arch with adders

openfpga_flow/benchmarks/micro_benchmark/adder/adder_16/adder_16.v

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+// Creating a scaleable adder
+
+module adder_16(cout, sum, a, b, cin);
+parameter size = 6;  /* declare a parameter. default required */
+output cout;
+output [size-1:0] sum; 	 // sum uses the size parameter
+input cin;
+input [size-1:0] a, b;  // 'a' and 'b' use the size parameter
+
+assign {cout, sum} = a + b + cin;
+
+endmodule
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+

openfpga_flow/benchmarks/micro_benchmark/adder/adder_4/adder_4.v

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+// Creating a scaleable adder
+
+module adder_4(cout, sum, a, b, cin);
+parameter size = 4;  /* declare a parameter. default required */
+output cout;
+output [size-1:0] sum; 	 // sum uses the size parameter
+input cin;
+input [size-1:0] a, b;  // 'a' and 'b' use the size parameter
+
+assign {cout, sum} = a + b + cin;
+
+endmodule
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openfpga_flow/benchmarks/micro_benchmark/adder/adder_6/adder_6.v

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+// Creating a scaleable adder
+
+module adder_6(cout, sum, a, b, cin);
+parameter size = 6;  /* declare a parameter. default required */
+output cout;
+output [size-1:0] sum; 	 // sum uses the size parameter
+input cin;
+input [size-1:0] a, b;  // 'a' and 'b' use the size parameter
+
+assign {cout, sum} = a + b + cin;
+
+endmodule
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openfpga_flow/benchmarks/micro_benchmark/adder/adder_8/adder_8_post_synthesis.v

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+/* Generated by Yosys 0.9+2406 (git sha1 3a9968de, gcc 8.4.0 -fPIC -Os) */
+
+module adder_8(\a[0] , \a[1] , \a[2] , \a[3] , \a[4] , \a[5] , \a[6] , \a[7] , \b[0] , \b[1] , \b[2] , \b[3] , \b[4] , \b[5] , \b[6] , \b[7] , cin, cout, \sum[0] , \sum[1] , \sum[2] , \sum[3] , \sum[4] , \sum[5] , \sum[6] , \sum[7] );
+  wire _00_;
+  wire _01_;
+  wire _02_;
+  wire _03_;
+  wire _04_;
+  wire _05_;
+  wire _06_;
+  wire _07_;
+  wire _08_;
+  wire _09_;
+  wire _10_;
+  wire _11_;
+  wire _12_;
+  input \a[0] ;
+  input \a[1] ;
+  input \a[2] ;
+  input \a[3] ;
+  input \a[4] ;
+  input \a[5] ;
+  input \a[6] ;
+  input \a[7] ;
+  input \b[0] ;
+  input \b[1] ;
+  input \b[2] ;
+  input \b[3] ;
+  input \b[4] ;
+  input \b[5] ;
+  input \b[6] ;
+  input \b[7] ;
+  input cin;
+  output cout;
+  output \sum[0] ;
+  output \sum[1] ;
+  output \sum[2] ;
+  output \sum[3] ;
+  output \sum[4] ;
+  output \sum[5] ;
+  output \sum[6] ;
+  output \sum[7] ;
+  assign cout = 8'h8e >> { _00_, \a[7] , \b[7]  };
+  assign _08_ = 4'h8 >> { \a[5] , \b[5]  };
+  assign \sum[0]  = 8'h96 >> { \a[0] , \b[0] , cin };
+  assign \sum[1]  = 8'h69 >> { _05_, \a[1] , \b[1]  };
+  assign \sum[2]  = 16'h6a56 >> { _05_, \a[1] , \b[1] , _04_ };
+  assign \sum[3]  = 16'h9996 >> { _03_, _06_, \a[3] , \b[3]  };
+  assign \sum[4]  = 8'h69 >> { _02_, \a[4] , \b[4]  };
+  assign \sum[5]  = 8'h69 >> { _09_, \a[5] , \b[5]  };
+  assign _09_ = 8'h71 >> { _02_, \a[4] , \b[4]  };
+  assign \sum[6]  = 16'h9996 >> { _01_, _08_, \a[6] , \b[6]  };
+  assign \sum[7]  = 8'h69 >> { _00_, \a[7] , \b[7]  };
+  assign _00_ = 16'h011f >> { \a[6] , \b[6] , _01_, _08_ };
+  assign _01_ = 16'h4054 >> { _02_, \a[4] , \b[4] , _07_ };
+  assign _02_ = 16'h011f >> { \a[3] , \b[3] , _03_, _06_ };
+  assign _03_ = 16'h80a8 >> { _05_, \a[1] , \b[1] , _04_ };
+  assign _04_ = 4'h6 >> { \a[2] , \b[2]  };
+  assign _05_ = 8'h17 >> { \a[0] , \b[0] , cin };
+  assign _06_ = 4'h8 >> { \a[2] , \b[2]  };
+  assign _07_ = 4'h1 >> { \a[5] , \b[5]  };
+  assign _10_ = 1'h0;
+  assign _11_ = 1'h1;
+  assign _12_ = 1'hx;
+endmodule