bench: add bench_random_number_generation.v

vlib/v/tests/bench/bench_random_number_generation.v

@@ -0,0 +1,50 @@
+import os
+import rand
+import rand.wyrand
+import rand.musl
+import rand.pcg32
+import benchmark
+
+const max_iterations = os.getenv_opt('MAX_ITERATIONS') or { '1000' }.int()
+
+fn main() {
+	mut sum := 0
+	mut bigsum := u64(0)
+	mut b := benchmark.start()
+
+	C.srand(7868768)
+	for _ in 0 .. max_iterations {
+		sum += C.rand()
+	}
+	b.measure('C.rand called ${max_iterations} times, sum: ${sum}')
+
+	rand.seed([u32(545123), 87834597])
+	for _ in 0 .. max_iterations {
+		bigsum += rand.u64()
+	}
+	b.measure('rand.u64 called ${max_iterations} times, bigsum: ${bigsum}')
+
+	bigsum = 0
+	mut wy := &wyrand.WyRandRNG{}
+	wy.seed([u32(2345345), 8787671])
+	for _ in 0 .. max_iterations {
+		bigsum += wy.u64()
+	}
+	b.measure('wy.u64 called ${max_iterations} times, bigsum: ${bigsum}')
+
+	bigsum = 0
+	mut mu := &musl.MuslRNG{}
+	mu.seed([u32(2345345)])
+	for _ in 0 .. max_iterations {
+		bigsum += mu.u64()
+	}
+	b.measure('mu.u64 called ${max_iterations} times, bigsum: ${bigsum}')
+
+	bigsum = 0
+	mut pc := &pcg32.PCG32RNG{}
+	pc.seed([u32(2345345), 34345, 77634, 12381])
+	for _ in 0 .. max_iterations {
+		bigsum += pc.u64()
+	}
+	b.measure('pc.u64 called ${max_iterations} times, bigsum: ${bigsum}')
+}