Files
damn_simple_architecture/common/src/instructions/encode/tests.rs
T
2026-02-09 00:04:19 +00:00

99 lines
2.3 KiB
Rust

use crate::prelude::*;
#[test]
fn test_encode_nop() {
let no_reg = Register::Null as u32;
let no_op = u32::from(Instruction::Nop.opcode());
let expected = (no_op << 26) | (no_reg << 21) | (no_reg << 16) | (no_reg << 11);
let got = Instruction::Nop.encode();
assert_eq!(expected, got);
}
#[test]
fn test_encode_mov() {
let rg0 = Register::Rg0 as u32;
let rg1 = Register::Rg1 as u32;
let no_reg = Register::Null as u32;
let instruction = Instruction::Mov(RTypeArgs::new(
Some(Register::Rg0),
None,
Some(Register::Rg1),
None,
));
let mov = u32::from(instruction.opcode());
let expected = (mov << 26) | (rg0 << 21) | (no_reg << 16) | (rg1 << 11);
let got = instruction.encode();
assert_eq!(expected, got);
}
#[test]
fn test_encode_load_byte() {
let rg0 = Register::Rg0 as u32;
let rg1 = Register::Rg1 as u32;
let immediate = 100;
let instruction = Instruction::LoadByte(ITypeArgs::new(
immediate,
Some(Register::Rg0),
Some(Register::Rg1),
));
let load_byte = u32::from(instruction.opcode());
let expected = (load_byte << 26) | (rg0 << 21) | (rg1 << 16) | u32::from(immediate);
let got = instruction.encode();
assert_eq!(expected, got);
}
#[test]
fn test_encode_shift_left_shamt() {
let rg0 = Register::Rg0 as u32;
let no_reg = Register::Null as u32;
let shift_amount = 5;
let instruction = Instruction::ShiftLeft(RTypeArgs::new(
Some(Register::Rg0),
None,
None,
Some(shift_amount),
));
let shift_left = u32::from(instruction.opcode());
let expected = (shift_left << 26)
| (rg0 << 21)
| (no_reg << 16)
| (no_reg << 11)
| (u32::from(shift_amount) << 6);
let got = instruction.encode();
assert_eq!(expected, got);
}
#[test]
fn test_encode_shift_left_reg() {
let rg0 = Register::Rg0 as u32;
let rg1 = Register::Rg1 as u32;
let no_reg = Register::Null as u32;
let instruction = Instruction::ShiftLeft(RTypeArgs::new(
Some(Register::Rg0),
Some(Register::Rg1),
None,
None,
));
let shift_left = u32::from(instruction.opcode());
let expected = (shift_left << 26) | (rg0 << 21) | (rg1 << 16) | (no_reg << 11);
let got = instruction.encode();
assert_eq!(expected, got);
}