blob: 3d00e124cb4fa9237504c6c13babea336781cc15 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
`include "core/isa.sv"
`include "core/uarch.sv"
module core_porch_conds
(
input word insn,
input psr_flags flags,
output logic execute,
conditional,
undefined
);
always_comb begin
undefined = 0;
conditional = 1;
unique case(insn `FIELD_COND)
`COND_EQ: execute = flags.z;
`COND_NE: execute = ~flags.z;
`COND_HS: execute = flags.c;
`COND_LO: execute = ~flags.c;
`COND_MI: execute = flags.n;
`COND_PL: execute = ~flags.n;
`COND_VS: execute = flags.v;
`COND_VC: execute = ~flags.v;
`COND_HI: execute = flags.c & ~flags.z;
`COND_LS: execute = ~flags.c | flags.z;
`COND_GE: execute = flags.n ~^ flags.v;
`COND_LT: execute = flags.n ^ flags.v;
`COND_GT: execute = ~flags.z & (flags.n ~^ flags.v);
`COND_LE: execute = flags.z | (flags.n ^ flags.v);
`COND_AL: begin
execute = 1;
conditional = 0;
end
`COND_UD: begin
execute = 1'bx;
conditional = 1'bx;
undefined = 1;
end
endcase
end
endmodule
|
