riscy_isa/opcode/
op_function.rs

1#[derive(Copy, Clone, Debug, PartialEq)]
2pub enum OpFunction {
3    ADD,
4    SUB,
5    SLL,
6    SLT,
7    SLTU,
8    XOR,
9    SRL,
10    SRA,
11    OR,
12    AND,
13
14    MUL,
15    MULH,
16    MULHSU,
17    MULHU,
18    DIV,
19    DIVU,
20    REM,
21    REMU,
22}
23
24impl OpFunction {
25    pub fn from_func3_func7(func3: u8, func7: u8) -> Self {
26        match (func7, func3) {
27            (0b0000000, 0b000) => Self::ADD,
28            (0b0100000, 0b000) => Self::SUB,
29            (0b0000000, 0b001) => Self::SLL,
30            (0b0000000, 0b010) => Self::SLT,
31            (0b0000000, 0b011) => Self::SLTU,
32            (0b0000000, 0b100) => Self::XOR,
33            (0b0000000, 0b101) => Self::SRL,
34            (0b0100000, 0b101) => Self::SRA,
35            (0b0000000, 0b110) => Self::OR,
36            (0b0000000, 0b111) => Self::AND,
37            (0b0000001, 0b000) => Self::MUL,
38            (0b0000001, 0b001) => Self::MULH,
39            (0b0000001, 0b010) => Self::MULHSU,
40            (0b0000001, 0b011) => Self::MULHU,
41            (0b0000001, 0b100) => Self::DIV,
42            (0b0000001, 0b101) => Self::DIVU,
43            (0b0000001, 0b110) => Self::REM,
44            (0b0000001, 0b111) => Self::REMU,
45
46            _ => unimplemented!("Op func7={:07b} func3={:03b}", func7, func3),
47        }
48    }
49
50    pub fn to_func3(&self) -> i32 {
51        match self {
52            Self::ADD => 0b000,
53            Self::SUB => 0b000,
54            Self::SLL => 0b001,
55            Self::SLT => 0b010,
56            Self::SLTU => 0b011,
57            Self::XOR => 0b100,
58            Self::SRL => 0b101,
59            Self::SRA => 0b101,
60            Self::OR => 0b110,
61            Self::AND => 0b111,
62            Self::MUL => 0b000,
63            Self::MULH => 0b001,
64            Self::MULHSU => 0b010,
65            Self::MULHU => 0b011,
66            Self::DIV => 0b100,
67            Self::DIVU => 0b101,
68            Self::REM => 0b110,
69            Self::REMU => 0b111,
70        }
71    }
72
73    pub fn to_func7(&self) -> i32 {
74        match self {
75            Self::ADD => 0b0000000,
76            Self::SUB => 0b0100000,
77            Self::SLL => 0b0000000,
78            Self::SLT => 0b0000000,
79            Self::SLTU => 0b0000000,
80            Self::XOR => 0b0000000,
81            Self::SRL => 0b0000000,
82            Self::SRA => 0b0100000,
83            Self::OR => 0b0000000,
84            Self::AND => 0b0000000,
85            Self::MUL => 0b0000001,
86            Self::MULH => 0b0000001,
87            Self::MULHSU => 0b0000001,
88            Self::MULHU => 0b0000001,
89            Self::DIV => 0b0000001,
90            Self::DIVU => 0b0000001,
91            Self::REM => 0b0000001,
92            Self::REMU => 0b0000001,
93        }
94    }
95}
riscy_isa/opcode/op_function.rs

riscy_isa/opcode/
op_function.rs
