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[/] [yacc/] [trunk/] [syn/] [xilinx/] [shifter_xilinx.v] - Blame information for rev 4

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Line No.	Rev	Author	Line
1	2	tak.sugawa	`//Jul.5.2004 reduce critical path cell`
2			`//Apr.5.2005 always @(*)`
3			`include "define.h"
4			`module`
5			`shifter(a,c,shift_func,shift_amount);`
6			`input [31:0] a;`
7			`output [31:0] c;`
8			`input [1:0] shift_func;`
9			`input [4:0] shift_amount;`
10
11			`reg [31:0] c;`
12
13			`always @ (*) begin //`
14			`if (!shift_func[1] ) begin`
15			`case (shift_amount[4:0] )`
16			`5'b00000: c=a;`
17			`5'b00001: c={a[30:0],1'b0};`
18			`5'b00010: c={a[29:0],2'b00};`
19			`5'b00011: c={a[28:0],3'b000};`
20			`5'b00100: c={a[27:0],4'b0000};`
21			`5'b00101: c={a[26:0],5'b0_0000};`
22			`5'b00110: c={a[25:0],6'b00_0000};`
23			`5'b00111: c={a[24:0],7'b000_0000};`
24			`5'b01000: c={a[23:0],8'b0000_0000};`
25			`5'b01001: c={a[22:0],9'b0_0000_0000};`
26			`5'b01010: c={a[21:0],10'b00_0000_0000};`
27			`5'b01011: c={a[20:0],11'b000_0000_0000};`
28			`5'b01100: c={a[19:0],12'b0000_0000_0000};`
29			`5'b01101: c={a[18:0],13'b0_0000_0000_0000};`
30			`5'b01110: c={a[17:0],14'b00_0000_0000_0000};`
31			`5'b01111: c={a[16:0],15'b000_0000_0000_0000};`
32			`5'b10000: c={a[15:0],16'b0000_0000_0000_0000};`
33			`5'b10001: c={a[14:0],16'b0000_0000_0000_0000,1'b0};`
34			`5'b10010: c={a[13:0],16'b0000_0000_0000_0000,2'b00};`
35			`5'b10011: c={a[12:0],16'b0000_0000_0000_0000,3'b000};`
36			`5'b10100: c={a[11:0],16'b0000_0000_0000_0000,4'b0000};`
37			`5'b10101: c={a[10:0],16'b0000_0000_0000_0000,5'b0_0000};`
38			`5'b10110: c={a[9:0],16'b0000_0000_0000_0000,6'b00_0000};`
39			`5'b10111: c={a[8:0],16'b0000_0000_0000_0000,7'b000_0000};`
40			`5'b11000: c={a[7:0],16'b0000_0000_0000_0000,8'b0000_0000};`
41			`5'b11001: c={a[6:0],16'b0000_0000_0000_0000,9'b0_0000_0000};`
42			`5'b11010: c={a[5:0],16'b0000_0000_0000_0000,10'b00_0000_0000};`
43			`5'b11011: c={a[4:0],16'b0000_0000_0000_0000,11'b000_0000_0000};`
44			`5'b11100: c={a[3:0],16'b0000_0000_0000_0000,12'b0000_0000_0000};`
45			`5'b11101: c={a[2:0],16'b0000_0000_0000_0000,13'b0_0000_0000_0000};`
46			`5'b11110: c={a[1:0],16'b0000_0000_0000_0000,14'b00_0000_0000_0000};`
47			`5'b11111: c={a[0],16'b0000_0000_0000_0000,15'b000_0000_0000_0000};`
48			`endcase`
49			end else if (shift_func==`SHIFT_RIGHT_UNSIGNED) begin
50			`case (shift_amount)`
51			`5'b00000: c=a;`
52			`5'b00001: c={1'b0,a[31:1]};`
53			`5'b00010: c={2'b00,a[31:2]};`
54			`5'b00011: c={3'b000,a[31:3]};`
55			`5'b00100: c={4'b0000,a[31:4]};`
56			`5'b00101: c={5'b0_0000,a[31:5]};`
57			`5'b00110: c={6'b00_0000,a[31:6]};`
58			`5'b00111: c={7'b000_0000,a[31:7]};`
59			`5'b01000: c={8'b0000_0000,a[31:8]};`
60			`5'b01001: c={9'b0_0000_0000,a[31:9]};`
61			`5'b01010: c={10'b00_0000_0000,a[31:10]};`
62			`5'b01011: c={11'b000_0000_0000,a[31:11]};`
63			`5'b01100: c={12'b0000_0000_0000,a[31:12]};`
64			`5'b01101: c={13'b0_0000_0000_0000,a[31:13]};`
65			`5'b01110: c={14'b00_0000_0000_0000,a[31:14]};`
66			`5'b01111: c={15'b000_0000_0000_0000,a[31:15]};`
67			`5'b10000: c={16'b0000_0000_0000_0000,a[31:16]};`
68			`5'b10001: c={16'b0000_0000_0000_0000,1'b0,a[31:17]};`
69			`5'b10010: c={16'b0000_0000_0000_0000,2'b00,a[31:18]};`
70			`5'b10011: c={16'b0000_0000_0000_0000,3'b000,a[31:19]};`
71			`5'b10100: c={16'b0000_0000_0000_0000,4'b0000,a[31:20]};`
72			`5'b10101: c={16'b0000_0000_0000_0000,5'b0_0000,a[31:21]};`
73			`5'b10110: c={16'b0000_0000_0000_0000,6'b00_0000,a[31:22]};`
74			`5'b10111: c={16'b0000_0000_0000_0000,7'b000_0000,a[31:23]};`
75			`5'b11000: c={16'b0000_0000_0000_0000,8'b0000_0000,a[31:24]};`
76			`5'b11001: c={16'b0000_0000_0000_0000,9'b0_0000_0000,a[31:25]};`
77			`5'b11010: c={16'b0000_0000_0000_0000,10'b00_0000_0000,a[31:26]};`
78			`5'b11011: c={16'b0000_0000_0000_0000,11'b000_0000_0000,a[31:27]};`
79			`5'b11100: c={16'b0000_0000_0000_0000,12'b0000_0000_0000,a[31:28]};`
80			`5'b11101: c={16'b0000_0000_0000_0000,13'b0_0000_0000_0000,a[31:29]};`
81			`5'b11110: c={16'b0000_0000_0000_0000,14'b00_0000_0000_0000,a[31:30]};`
82			`5'b11111: c={16'b0000_0000_0000_0000,15'b000_0000_0000_0000,a[31:31]};`
83			`endcase`
84			`end else begin// SHIFT_RIGHT_SIGNED`
85			`case (shift_amount)`
86			`5'b00000: c=a;`
87			`5'b00001: c={a[31],a[31:1]};`
88			`5'b00010: c={{2{a[31]}},a[31:2]};`
89			`5'b00011: c={{3{a[31]}},a[31:3]};`
90			`5'b00100: c={{4{a[31]}},a[31:4]};`
91			`5'b00101: c={{5{a[31]}},a[31:5]};`
92			`5'b00110: c={{6{a[31]}},a[31:6]};`
93			`5'b00111: c={{7{a[31]}},a[31:7]};`
94			`5'b01000: c={{8{a[31]}},a[31:8]};`
95			`5'b01001: c={{9{a[31]}},a[31:9]};`
96			`5'b01010: c={{10{a[31]}},a[31:10]};`
97			`5'b01011: c={{11{a[31]}},a[31:11]};`
98			`5'b01100: c={{12{a[31]}},a[31:12]};`
99			`5'b01101: c={{13{a[31]}},a[31:13]};`
100			`5'b01110: c={{14{a[31]}},a[31:14]};`
101			`5'b01111: c={{15{a[31]}},a[31:15]};`
102			`5'b10000: c={{16{a[31]}},a[31:16]};`
103			`5'b10001: c={{17{a[31]}},a[31:17]};`
104			`5'b10010: c={{18{a[31]}},a[31:18]};`
105			`5'b10011: c={{19{a[31]}},a[31:19]};`
106			`5'b10100: c={{20{a[31]}},a[31:20]};`
107			`5'b10101: c={{21{a[31]}},a[31:21]};`
108			`5'b10110: c={{22{a[31]}},a[31:22]};`
109			`5'b10111: c={{23{a[31]}},a[31:23]};`
110			`5'b11000: c={{24{a[31]}},a[31:24]};`
111			`5'b11001: c={{25{a[31]}},a[31:25]};`
112			`5'b11010: c={{26{a[31]}},a[31:26]};`
113			`5'b11011: c={{27{a[31]}},a[31:27]};`
114			`5'b11100: c={{28{a[31]}},a[31:28]};`
115			`5'b11101: c={{29{a[31]}},a[31:29]};`
116			`5'b11110: c={{30{a[31]}},a[31:30]};`
117			`5'b11111: c={{31{a[31]}},a[31:31]};`
118			`endcase`
119			`end`
120			`end`
121
122
123
124
125
126
127			`endmodule`

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[/] [yacc/] [trunk/] [syn/] [xilinx/] [shifter_xilinx.v] - Blame information for rev 4