Function parse_branch

crates/asm-to-binary/src/assembler/parser.rs:495–509

Parse `rs1, rs2, label` for a branch instruction.

(kind: BranchKind, operands: &str)

}

// Parse `"rd, rs"` -> `(rd_reg, rs_reg)`. Used by `mv`.
fn parse_two_regs(operands: &str) -> Option<(u8, u8)> {
    let (rd_str, rs_str) = parse_two_fields(operands)?;
    Some((parse_int_reg(rd_str)?, parse_int_reg(rs_str)?))
}

// Parse `"rd, rs1, imm"` -> (rd_reg, rs1_reg, imm_i32).
fn parse_r_i_imm(operands: &str) -> Option<(u8, u8, i32)> {
    let mut parts = operands.splitn(3, ',');
    let rd = parse_int_reg(parts.next()?.trim())?;
    let rs1 = parse_int_reg(parts.next()?.trim())?;
    let imm = parse_imm_i64(parts.next()?.trim())? as i32;
    Some((rd, rs1, imm))
}

// Parse `"rs2, imm(rs1)"` -> (rs2_reg, rs1_reg, imm_i32). Used by stores.
fn parse_store_mem(operands: &str) -> Option<(u8, u8, i32)> {
    let comma = operands.find(',')?;