Function parse_csr_name

crates/asm-to-binary/src/assembler/parser.rs:566–596

Map a CSR name or numeric literal to its 12-bit address.

(name: &str)

            let rd = parse_int_reg(parts[0].trim())?;
            let target = parts[1].trim().to_owned();
            Some(AsmToken::Jal { rd, target })
        }
        1 => {
            // Bare `jal label` means `jal ra, label`.
            let target = parts[0].trim().to_owned();
            if target.is_empty() {
                None
            } else {
                Some(AsmToken::Jal { rd: 1, target })
            }
        }
        _ => None,
    }
}

// Parse `rd, symbol` for the `la` pseudo-instruction.
fn parse_la(operands: &str) -> Option<AsmToken> {
    let parts: Vec<&str> = operands.splitn(2, ',').collect();
    if parts.len() != 2 {
        return None;
    }
    let rd = parse_int_reg(parts[0].trim())?;
    let symbol = parts[1].trim().to_owned();
    if symbol.is_empty() {
        None
    } else {
        Some(AsmToken::La { rd, symbol })
    }
}

// Parse `rs, label` for a compare-with-zero branch pseudo (`blez`/`bgez`/`bltz`/`bgtz`),
// expanding to the spec's `bge`/`blt` form against x0.
fn parse_branch_vs_zero(mnemonic: &str, operands: &str) -> Option<AsmToken> {
    let comma = operands.find(',')?;