Function prev_live

compiler/src/modules/vm/optimizer.rs:187–194

Nearest live instruction before `from`; skips entries already marked dead by inner folds. */

(dead: &[bool], from: usize)

/* Nearest live instruction before `from`; skips entries already marked dead by inner folds. */
fn prev_live(dead: &[bool], from: usize) -> Option<usize> {
    let mut i = from;
    while i > 0 {
        i -= 1;
        if !dead[i] { return Some(i); }
    }
    None
}

fn try_fold_binop(chunk: &mut SSAChunk, dead: &mut [bool], ip: usize) {
    let Some(prev1_ip) = prev_live(dead, ip) else { return };