//go:noinline
func dummy() {}

// Signed 64-bit compare-and-branch.
func si64(x, y chan int64) {
	// s390x:"CGRJ\t[$](2|4), R[0-9]+, R[0-9]+, "
	for <-x < <-y {
		dummy()
	}

	// s390x:"CL?GRJ\t[$]8, R[0-9]+, R[0-9]+, "
	for <-x == <-y {
		dummy()
	}
}

// Signed 64-bit compare-and-branch with 8-bit immediate.
func si64x8(doNotOptimize int64) {