Method adaptive

crates/vm/src/frame.rs:8072–8086

(&mut self, specialize: impl FnOnce(&mut Self, usize, usize))

    /// Adaptive counter: trigger specialization at zero, otherwise advance countdown.
    #[inline]
    fn adaptive(&mut self, specialize: impl FnOnce(&mut Self, usize, usize)) {
        let instr_idx = self.lasti() as usize - 1;
        let cache_base = instr_idx + 1;
        let counter = self.code.instructions.read_adaptive_counter(cache_base);
        if bytecode::adaptive_counter_triggers(counter) {
            specialize(self, instr_idx, cache_base);
        } else {
            unsafe {
                self.code.instructions.write_adaptive_counter(
                    cache_base,
                    bytecode::advance_adaptive_counter(counter),
                );
            }
        }
    }

    /// Install a specialized opcode and set adaptive cooldown bits.
    #[inline]