ab_riscv_primitives/instructions/rv64/zk/
zbkx.rs

1//! RV64 Zbkx 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 Zbkx instruction (Crossbar permutations)
12#[instruction]
13#[derive(Debug, Clone, Copy, PartialEq, Eq)]
14pub enum Rv64ZbkxInstruction<Reg> {
15    Xperm4 { rd: Reg, rs1: Reg, rs2: Reg },
16    Xperm8 { rd: Reg, rs1: Reg, rs2: Reg },
17}
18
19#[instruction]
20impl<Reg> const Instruction for Rv64ZbkxInstruction<Reg>
21where
22    Reg: [const] Register<Type = u64>,
23{
24    type Reg = Reg;
25
26    #[inline(always)]
27    fn try_decode(instruction: u32) -> Option<Self> {
28        let opcode = (instruction & 0b111_1111) as u8;
29        let rd_bits = ((instruction >> 7) & 0x1f) as u8;
30        let funct3 = ((instruction >> 12) & 0b111) as u8;
31        let rs1_bits = ((instruction >> 15) & 0x1f) as u8;
32        let rs2_bits = ((instruction >> 20) & 0x1f) as u8;
33        let funct7 = ((instruction >> 25) & 0b111_1111) as u8;
34
35        match opcode {
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                    (0b010, 0b0010100) => Some(Self::Xperm4 { rd, rs1, rs2 }),
42                    (0b100, 0b0010100) => Some(Self::Xperm8 { rd, rs1, rs2 }),
43                    _ => None,
44                }
45            }
46            _ => None,
47        }
48    }
49
50    #[inline(always)]
51    fn alignment() -> u8 {
52        align_of::<u32>() as u8
53    }
54
55    #[inline(always)]
56    fn size(&self) -> u8 {
57        size_of::<u32>() as u8
58    }
59}
60
61impl<Reg> fmt::Display for Rv64ZbkxInstruction<Reg>
62where
63    Reg: fmt::Display,
64{
65    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
66        match self {
67            Self::Xperm4 { rd, rs1, rs2 } => write!(f, "xperm4 {}, {}, {}", rd, rs1, rs2),
68            Self::Xperm8 { rd, rs1, rs2 } => write!(f, "xperm8 {}, {}, {}", rd, rs1, rs2),
69        }
70    }
71}
ab_riscv_primitives/instructions/rv64/zk/zbkx.rs

ab_riscv_primitives/instructions/rv64/zk/
zbkx.rs
