Method update

hail-fuzz/src/i2s/analysis.rs:114–142

(&mut self, prev: i64, next: i64)

impl StrideEstimator {
    fn update(&mut self, prev: i64, next: i64) {
        if prev == next {
            return;
        }

        let prev_stride = match self.stride {
            Some(stride) => stride,
            None => return self.start_stride(prev, next),
        };

        if prev_stride == next.wrapping_sub(prev) {
            self.stride_count += 1;
            // Keep track of the furthest away we have reached from the current stride.
            self.end = match prev_stride > 0 {
                true => self.end.max(next),
                false => self.end.min(next),
            };
            return;
        }

        if next == self.start {
            // We returned to the start of the stride.
            return;
        }

        // Stride does not match, update the best stride and reset.
        self.finalize_stride(prev_stride);
        self.start_stride(prev, next);
    }

    fn finalize_stride(&mut self, prev_stride: i64) {
        let new = Counter { start: self.start, stride: prev_stride, end: self.end };