1 files changed, 39 insertions, 0 deletions
diff --git a/test/math/transforms/ntt.cpp b/test/math/transforms/ntt.cpp
new file mode 100644
index 0000000..cd32073
--- /dev/null
+++ b/test/math/transforms/ntt.cpp
@@ -0,0 +1,39 @@
+#include "../../util.h"
+#include <math/modPowIterativ.cpp>
+#include <math/transforms/ntt.cpp>
+
+void stress_test() {
+	ll queries = 0;
+	for (ll i = 0; i < 10'000; i++) {
+		int n = 1ll << Random::integer<int>(0, 10);
+		auto expected = Random::integers<ll>(n, 0, mod);
+		auto got = expected;
+		ntt(got, false);
+		ntt(got, true);
+		if (got != expected) cerr << "error" << FAIL;
+		queries += n;
+	}
+	cerr << "tested queries: " << queries << endl;
+}
+
+constexpr int N = 1ll << 22;
+void performance_test() {
+	timer t;
+	vector<ll> a = Random::integers<ll>(N, 0, mod);
+	vector<ll> b = Random::integers<ll>(N, 0, mod);
+	t.start();
+	ntt(a, true);
+	ntt(b, false);
+	t.stop();
+	hash_t hash = 0;
+	for (ll i = 0; i < N; i++) hash += i * a[i];
+	for (ll i = 0; i < N; i++) hash += i * b[i];
+	if (t.time > 500) cerr << "too slow: " << t.time << FAIL;
+	cerr << "tested performance: " << t.time << "ms (hash: " << hash << ")" << endl;
+}
+
+int main() {
+	stress_test();
+	performance_test();
+}
+