if !*calibrate {
		return
	}

	computeKaratsubaThresholds()

	// compute basicSqrThreshold where overhead becomes negligible
	minSqr := computeSqrThreshold(10, 30, 1, 3, sqrModeMul, sqrModeBasic)
	// compute karatsubaSqrThreshold where karatsuba is faster
	maxSqr := computeSqrThreshold(200, 500, 10, 3, sqrModeBasic, sqrModeKaratsuba)
	if minSqr != 0 {
		fmt.Printf("found basicSqrThreshold = %d\n", minSqr)
	} else {