ab_riscv_primitives/instructions/rv64/b/
zbc.rs

1//! RV64 Zbc extension
2
3#[cfg(test)]
4mod tests;
5
6use crate::instructions::Instruction;
7use crate::registers::general_purpose::Register;
8use ab_riscv_macros::instruction;
9use core::fmt;
10
11/// RISC-V RV64 Zbc instruction (Carryless multiplication)
12#[instruction]
13#[derive(Debug, Clone, Copy, PartialEq, Eq)]
14pub enum Rv64ZbcInstruction<Reg> {
15    Clmul { rd: Reg, rs1: Reg, rs2: Reg },
16    Clmulh { rd: Reg, rs1: Reg, rs2: Reg },
17    Clmulr { rd: Reg, rs1: Reg, rs2: Reg },
18}
19
20#[instruction]
21impl<Reg> const Instruction for Rv64ZbcInstruction<Reg>
22where
23    Reg: [const] Register<Type = u64>,
24{
25    type Reg = Reg;
26
27    #[inline(always)]
28    fn try_decode(instruction: u32) -> Option<Self> {
29        let opcode = (instruction & 0b111_1111) as u8;
30        let rd_bits = ((instruction >> 7) & 0x1f) as u8;
31        let funct3 = ((instruction >> 12) & 0b111) as u8;
32        let rs1_bits = ((instruction >> 15) & 0x1f) as u8;
33        let rs2_bits = ((instruction >> 20) & 0x1f) as u8;
34        let funct7 = ((instruction >> 25) & 0b111_1111) as u8;
35
36        match opcode {
37            // R-type
38            0b0110011 => {
39                let rd = Reg::from_bits(rd_bits)?;
40                let rs1 = Reg::from_bits(rs1_bits)?;
41                let rs2 = Reg::from_bits(rs2_bits)?;
42                match (funct3, funct7) {
43                    (0b001, 0b0000101) => Some(Self::Clmul { rd, rs1, rs2 }),
44                    (0b011, 0b0000101) => Some(Self::Clmulh { rd, rs1, rs2 }),
45                    (0b010, 0b0000101) => Some(Self::Clmulr { rd, rs1, rs2 }),
46                    _ => None,
47                }
48            }
49            _ => None,
50        }
51    }
52
53    #[inline(always)]
54    fn alignment() -> u8 {
55        size_of::<u32>() as u8
56    }
57
58    #[inline(always)]
59    fn size(&self) -> u8 {
60        size_of::<u32>() as u8
61    }
62}
63
64impl<Reg> fmt::Display for Rv64ZbcInstruction<Reg>
65where
66    Reg: fmt::Display,
67{
68    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
69        match self {
70            Self::Clmul { rd, rs1, rs2 } => write!(f, "clmul {}, {}, {}", rd, rs1, rs2),
71            Self::Clmulh { rd, rs1, rs2 } => write!(f, "clmulh {}, {}, {}", rd, rs1, rs2),
72            Self::Clmulr { rd, rs1, rs2 } => write!(f, "clmulr {}, {}, {}", rd, rs1, rs2),
73        }
74    }
75}
ab_riscv_primitives/instructions/rv64/b/zbc.rs

ab_riscv_primitives/instructions/rv64/b/
zbc.rs
