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/////////////////////////////////////////////////////////////////////
////  Author: Liwei                                              ////
////                                                             ////
////                                                             ////
////  If you encountered any problem, please contact :           ////
////  Email: mcupro@yahoo.com.hk or mcupro@opencores.org         ////
////                                                             ////
////  Downloaded from:                                           ////
////     http://www.opencores.org/pdownloads.cgi/list/mips789    ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
//// Copyright (C) 2006-2007 Liwei                               ////
////                         mcupro@yahoo.com.hk                 ////
////                                                             ////
////                                                             ////
//// This source file may be used and distributed freely without ////
//// restriction provided that this copyright statement is not   ////
//// removed from the file and any derivative work contains the  ////
//// original copyright notice and the associated disclaimer.    ////
////                                                             ////
//// Please let the author know if it is used                    ////
//// for commercial purpose.                                     ////
////                                                             ////
////     THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY     ////
//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   ////
//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS   ////
//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR      ////
//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,         ////
//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    ////
//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE   ////
//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        ////
//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  ////
//// LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT  ////
//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT  ////
//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         ////
//// POSSIBILITY OF SUCH DAMAGE.                                 ////
////                                                             ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
////                                                             ////
//// Date of Creation: 2007.8.1                                  ////
////                                                             ////
//// Version: 0.0.1                                              ////
////                                                             ////
//// Description:                                                ////
////                                                             ////
////                                                             ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
//// Change log:                                                 ////
////                                                             ////
/////////////////////////////////////////////////////////////////////
 
 
`define CMP_BEQ      1
`define CMP_BNE      2
`define CMP_BLEZ     3
`define CMP_BGEZ     4
`define CMP_BGTZ     5
`define CMP_BLTZ     6
`define CMP_NOP      0
 
module compare (
        input [31:0] s,
        input [31:0] t,
        input [2:0]ctl,
        output reg res
    );
    reg [32:0]sum;
    always @ (*)
    case  (ctl)
        `CMP_BEQ:   res = s==t;
        `CMP_BNE:   res = s!=t;
        `CMP_BLTZ:  res = s[31];
        `CMP_BGTZ:  res = ~s[31] && (|s[30:0]);
        `CMP_BLEZ:  res = s[31] |(~|s);
        `CMP_BGEZ:  res = ~s[31];
        default res=1'B0;
    endcase
endmodule

Line No.	Rev	Author	Line
1	2	mcupro	`/////////////////////////////////////////////////////////////////////`
2			`//// Author: Liwei ////`
3			`//// ////`
4			`//// ////`
5			`//// If you encountered any problem, please contact : ////`
6			`//// Email: mcupro@yahoo.com.hk or mcupro@opencores.org ////`
7			`//// ////`
8			`//// Downloaded from: ////`
9			`//// http://www.opencores.org/pdownloads.cgi/list/mips789 ////`
10			`/////////////////////////////////////////////////////////////////////`
11			`//// ////`
12			`//// Copyright (C) 2006-2007 Liwei ////`
13			`//// mcupro@yahoo.com.hk ////`
14			`//// ////`
15			`//// ////`
16			`//// This source file may be used and distributed freely without ////`
17			`//// restriction provided that this copyright statement is not ////`
18			`//// removed from the file and any derivative work contains the ////`
19			`//// original copyright notice and the associated disclaimer. ////`
20			`//// ////`
21			`//// Please let the author know if it is used ////`
22			`//// for commercial purpose. ////`
23			`//// ////`
24			//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
25			`//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////`
26			`//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////`
27			`//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////`
28			`//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////`
29			`//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////`
30			`//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////`
31			`//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////`
32			`//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////`
33			`//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////`
34			`//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////`
35			`//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////`
36			`//// POSSIBILITY OF SUCH DAMAGE. ////`
37			`//// ////`
38			`/////////////////////////////////////////////////////////////////////`
39			`//// ////`
40			`//// ////`
41			`//// Date of Creation: 2007.8.1 ////`
42			`//// ////`
43			`//// Version: 0.0.1 ////`
44			`//// ////`
45			`//// Description: ////`
46			`//// ////`
47			`//// ////`
48			`/////////////////////////////////////////////////////////////////////`
49			`//// ////`
50			`//// Change log: ////`
51			`//// ////`
52			`/////////////////////////////////////////////////////////////////////`
53
54
55			`define CMP_BEQ 1
56			`define CMP_BNE 2
57			`define CMP_BLEZ 3
58			`define CMP_BGEZ 4
59			`define CMP_BGTZ 5
60			`define CMP_BLTZ 6
61			`define CMP_NOP 0
62
63			`module compare (`
64			`input [31:0] s,`
65			`input [31:0] t,`
66			`input [2:0]ctl,`
67			`output reg res`
68			`);`
69			`reg [32:0]sum;`
70			`always @ (*)`
71			`case (ctl)`
72			`CMP_BEQ: res = s==t;
73			`CMP_BNE: res = s!=t;
74			`CMP_BLTZ: res = s[31];
75			`CMP_BGTZ: res = ~s[31] && (\|s[30:0]);
76			`CMP_BLEZ: res = s[31] \|(~\|s);
77			`CMP_BGEZ: res = ~s[31];
78			`default res=1'B0;`
79			`endcase`
80			`endmodule`

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[/] [mips789/] [branches/] [mcupro/] [verilog/] [mips_core/] [cmpare.v] - Blame information for rev 55