Function parse_r_i_imm

crates/asm-to-binary/src/assembler/parser.rs:454–460

Parse `"rd, rs1, imm"` -> (`rd_reg`, `rs1_reg`, `imm_i32`).

(operands: &str)

        return out;
    }

    if (-2_147_483_648..=2_147_483_647).contains(&imm) {
        load32(rd, imm as i32, &mut out);
        return out;
    }

    // 64-bit: split into high32 and low32, combine with shifts.
    // Uses t1 (x6) as a temporary for the high half.
    const T1: u8 = 6;
    let low32 = (imm & 0xFFFF_FFFF) as i32;