//--------------------------------------------------------------------------------------------------
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//--------------------------------------------------------------------------------------------------
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//
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//
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// Title : cmp
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// Title : cmp
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// Design : MicroRISCII
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// Design : MicroRISCII
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// Author : Ali Mashtizadeh
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// Author : Ali Mashtizadeh
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//
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//
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//-------------------------------------------------------------------------------------------------
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//-------------------------------------------------------------------------------------------------
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`timescale 1ps / 1ps
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`timescale 1ps / 1ps
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// Left to simplify decodeing
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// Left to simplify decodeing
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//`define CMP_J 4'b0000
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//`define CMP_J 4'b0000
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//`define CMP_JR 4'b0001
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//`define CMP_JR 4'b0001
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`define CMP_EQ 4'b0010
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`define CMP_EQ 4'b0010
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`define CMP_NE 4'b0011
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`define CMP_NE 4'b0011
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`define CMP_C 4'b0100
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`define CMP_C 4'b0100
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`define CMP_NC 4'b0101
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`define CMP_NC 4'b0101
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`define CMP_Z 4'b0110
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`define CMP_Z 4'b0110
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`define CMP_NZ 4'b0111
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`define CMP_NZ 4'b0111
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`define CMP_LT 4'b1000
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`define CMP_LT 4'b1000
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`define CMP_NLT 4'b1001
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`define CMP_NLT 4'b1001
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`define CMP_LTS 4'b1010
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`define CMP_LTS 4'b1010
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`define CMP_NLTS 4'b1011
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`define CMP_NLTS 4'b1011
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`define CMP_GT 4'b1100
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`define CMP_GT 4'b1100
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`define CMP_NGT 4'b1101
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`define CMP_NGT 4'b1101
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`define CMP_GTS 4'b1110
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`define CMP_GTS 4'b1110
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`define CMP_NGTS 4'b1111
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`define CMP_NGTS 4'b1111
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module cmp(a,b,cmp_op,true,c);
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module cmp(a,b,cmp_op,true,c);
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// Inputs
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// Inputs
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input [31:0] a;
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input [31:0] a;
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wire [31:0] a;
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wire [31:0] a;
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input [31:0] b;
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input [31:0] b;
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wire [31:0] b;
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wire [31:0] b;
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input [3:0] cmp_op;
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input [3:0] cmp_op;
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wire [3:0] cmp_op;
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wire [3:0] cmp_op;
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input c;
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input c;
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wire c;
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wire c;
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// Outputs
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// Outputs
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output true;
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output true;
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reg true;
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reg true;
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// Internal
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// Internal
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reg eq;
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reg eq;
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reg lt;
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reg lt;
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reg gt;
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reg gt;
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reg lts;
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reg lts;
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reg gts;
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reg gts;
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reg z;
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reg z;
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always @ (a || b)
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always @ (a || b)
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begin
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begin
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if (a == b)
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if (a == b)
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eq = 1'b1;
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eq = 1'b1;
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else
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else
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eq = 1'b0;
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eq = 1'b0;
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if (a < b)
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if (a < b)
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lt = 1'b1;
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lt = 1'b1;
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else
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else
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lt = 1'b0;
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lt = 1'b0;
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if ((a[30:0] < b[30]) && a[31] && b[31])
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if ((a[30:0] < b[30]) && a[31] && b[31])
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lts = 1'b1;
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lts = 1'b1;
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else if (a[31] == 1'b1 && b[31] == 1'b0)
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else if (a[31] == 1'b1 && b[31] == 1'b0)
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lts = 1'b1;
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lts = 1'b1;
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else
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else
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lts = 1'b0;
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lts = 1'b0;
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if (a > b)
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if (a > b)
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gt = 1'b1;
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gt = 1'b1;
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else
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else
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gt = 1'b0;
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gt = 1'b0;
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if ((a[30:0] > b[30]) && a[31] && b[31])
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if ((a[30:0] > b[30]) && a[31] && b[31])
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gts = 1'b1;
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gts = 1'b1;
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else if (a[31] == 1'b0 && b[31] == 1'b1)
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else if (a[31] == 1'b0 && b[31] == 1'b1)
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gts = 1'b1;
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gts = 1'b1;
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else
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else
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gts = 1'b0;
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gts = 1'b0;
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if (a == 32'b0)
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if (a == 32'b0)
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z = 1'b1;
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z = 1'b1;
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else
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else
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z = 1'b0;
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z = 1'b0;
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end
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end
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always @ (cmp_op || eq || z || c || lt || gt)
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always @ (cmp_op || eq || z || c || lt || gt)
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case (cmp_op)
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case (cmp_op)
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//`CMP_J : true = 1'b1; // Taken care of in decoder
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//`CMP_J : true = 1'b1; // Taken care of in decoder
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//`CMP_JR : true = 1'b1; // Taken care of in decoder
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//`CMP_JR : true = 1'b1; // Taken care of in decoder
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`CMP_EQ : true = eq;
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`CMP_EQ : true = eq;
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`CMP_NE : true = !(eq);
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`CMP_NE : true = !(eq);
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`CMP_Z : true = z;
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`CMP_Z : true = z;
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`CMP_NZ : true = !(z);
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`CMP_NZ : true = !(z);
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`CMP_C : true = c;
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`CMP_C : true = c;
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`CMP_NC : true = !(c);
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`CMP_NC : true = !(c);
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`CMP_LT : true = lts;
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`CMP_LT : true = lts;
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`CMP_NLT : true = !(lts);
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`CMP_NLT : true = !(lts);
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`CMP_LTS : true = lt;
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`CMP_LTS : true = lt;
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`CMP_NLTS : true = !(lt);
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`CMP_NLTS : true = !(lt);
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`CMP_GT : true = gts;
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`CMP_GT : true = gts;
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`CMP_NGT : true = !(gts);
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`CMP_NGT : true = !(gts);
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`CMP_GTS : true = gt;
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`CMP_GTS : true = gt;
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`CMP_NGTS : true = !(gt);
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`CMP_NGTS : true = !(gt);
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endcase
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endcase
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endmodule
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endmodule
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