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use super::super::arg::Sf;
/// The struct that represents an A64 multiply-add instruction that can be
/// encoded.
///
/// +-------------+-------------+-------------+-------------+-------------+-------------+-------------+-------------+
/// | 31 30 29 28 | 27 26 25 24 | 23 22 21 20 | 19 18 17 16 | 15 14 13 12 | 11 10 09 08 | 07 06 05 04 | 03 02 01 00 |
/// | 0 0 1 1 0 1 1 0 0 0 0 |
/// | sf rm.............. ra.............. rn.............. rd.............. |
/// +-------------+-------------+-------------+-------------+-------------+-------------+-------------+-------------+
///
pub struct MAdd {
/// The number of the general-purpose destination register.
rd: u8,
/// The number of the first general-purpose source register.
rn: u8,
/// The number of the third general-purpose source register.
ra: u8,
/// The number of the second general-purpose source register.
rm: u8,
/// The size of the registers of this instruction.
sf: Sf
}
impl MAdd {
/// MUL
/// <https://developer.arm.com/documentation/ddi0602/2023-06/Base-Instructions/MUL--Multiply--an-alias-of-MADD->
pub fn mul(rd: u8, rn: u8, rm: u8, num_bits: u8) -> Self {
Self { rd, rn, ra: 0b11111, rm, sf: num_bits.into() }
}
}
impl From<MAdd> for u32 {
/// Convert an instruction into a 32-bit value.
fn from(inst: MAdd) -> Self {
0
| ((inst.sf as u32) << 31)
| (0b11011 << 24)
| ((inst.rm as u32) << 16)
| ((inst.ra as u32) << 10)
| ((inst.rn as u32) << 5)
| (inst.rd as u32)
}
}
impl From<MAdd> for [u8; 4] {
/// Convert an instruction into a 4 byte array.
fn from(inst: MAdd) -> [u8; 4] {
let result: u32 = inst.into();
result.to_le_bytes()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_mul_32() {
let result: u32 = MAdd::mul(0, 1, 2, 32).into();
assert_eq!(0x1B027C20, result);
}
#[test]
fn test_mul_64() {
let result: u32 = MAdd::mul(0, 1, 2, 64).into();
assert_eq!(0x9B027C20, result);
}
}
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