ab_riscv_primitives/instruction/rv64/b/
zbc.rs

1//! RV64 Zbc extension
2
3#[cfg(test)]
4mod tests;
5
6use crate::instruction::Instruction;
7use crate::instruction::rv64::Rv64Instruction;
8use crate::registers::Register;
9use core::fmt;
10
11/// RISC-V RV64 Zbc instruction (Carryless multiplication)
12#[derive(Debug, Clone, Copy, PartialEq, Eq)]
13pub enum Rv64ZbcInstruction<Reg> {
14    Clmul { rd: Reg, rs1: Reg, rs2: Reg },
15    Clmulh { rd: Reg, rs1: Reg, rs2: Reg },
16    Clmulr { rd: Reg, rs1: Reg, rs2: Reg },
17}
18
19impl<Reg> const Instruction for Rv64ZbcInstruction<Reg>
20where
21    Reg: [const] Register<Type = u64>,
22{
23    type Base = Rv64Instruction<Reg>;
24
25    #[inline(always)]
26    fn try_decode(instruction: u32) -> Option<Self> {
27        let opcode = (instruction & 0b111_1111) as u8;
28        let rd_bits = ((instruction >> 7) & 0x1f) as u8;
29        let funct3 = ((instruction >> 12) & 0b111) as u8;
30        let rs1_bits = ((instruction >> 15) & 0x1f) as u8;
31        let rs2_bits = ((instruction >> 20) & 0x1f) as u8;
32        let funct7 = ((instruction >> 25) & 0b111_1111) as u8;
33
34        Some(match opcode {
35            // R-type
36            0b0110011 => {
37                let rd = Reg::from_bits(rd_bits)?;
38                let rs1 = Reg::from_bits(rs1_bits)?;
39                let rs2 = Reg::from_bits(rs2_bits)?;
40                match (funct3, funct7) {
41                    (0b001, 0b0000101) => Self::Clmul { rd, rs1, rs2 },
42                    (0b011, 0b0000101) => Self::Clmulh { rd, rs1, rs2 },
43                    (0b010, 0b0000101) => Self::Clmulr { rd, rs1, rs2 },
44                    _ => {
45                        return None;
46                    }
47                }
48            }
49            _ => {
50                return None;
51            }
52        })
53    }
54
55    #[inline(always)]
56    fn size(&self) -> u8 {
57        size_of::<u32>() as u8
58    }
59}
60
61impl<Reg> fmt::Display for Rv64ZbcInstruction<Reg>
62where
63    Reg: fmt::Display,
64{
65    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
66        match self {
67            Self::Clmul { rd, rs1, rs2 } => write!(f, "clmul {}, {}, {}", rd, rs1, rs2),
68            Self::Clmulh { rd, rs1, rs2 } => write!(f, "clmulh {}, {}, {}", rd, rs1, rs2),
69            Self::Clmulr { rd, rs1, rs2 } => write!(f, "clmulr {}, {}, {}", rd, rs1, rs2),
70        }
71    }
72}
ab_riscv_primitives/instruction/rv64/b/zbc.rs

ab_riscv_primitives/instruction/rv64/b/
zbc.rs
