// Type checking guarantees that TIDEAL len/cap are positive and fit in an int.
	// The case of len or cap overflow when converting TUINT or TUINTPTR to TINT
	// will be handled by the negative range checks in unsafeslice during runtime.
	if ir.ShouldCheckPtr(ir.CurFunc, 1) {
		fnname := "unsafeslicecheckptr"
		fn := typecheck.LookupRuntime(fnname)