hash: add wyhash + benchmark, add fnv1a, add u64.hex() (#3584)

tools/bench/wyhash.v

@@ -0,0 +1,55 @@
+module main
+
+import (
+	hash.fnv1a
+	hash.wyhash
+	rand
+	time
+)
+
+fn main() {
+	sample_size := 10000000
+	min_str_len := 20
+	max_str_len := 40
+	println('Generating $sample_size strings between $min_str_len - $max_str_len chars long...')
+	mut bytepile := []byte
+	for _ in 0 .. sample_size * max_str_len {
+		bytepile << byte(40 + rand.next(125 - 40))
+	}
+	mut str_lens := []int
+	for _ in 0 .. sample_size {
+		str_lens << min_str_len + rand.next(max_str_len - min_str_len)
+	}
+	println('Hashing each of the generated strings...')
+	t0 := time.ticks()
+	mut start_pos := 0
+	for len in str_lens {
+		end_pos := start_pos + len
+		str := string(bytepile[start_pos..end_pos],len)
+		_ = wyhash.wyhash_c(&str.str, u64(str.len), 1)
+		start_pos = end_pos
+	}
+	t1 := time.ticks()
+	d1 := t1 - t0
+	println(' * wyhash4 C: ${d1}ms')
+	start_pos = 0
+	for len in str_lens {
+		end_pos := start_pos + len
+		str := string(bytepile[start_pos..end_pos],len)
+		_ = wyhash.sum64_string(str, 1)
+		start_pos = end_pos
+	}
+	t2 := time.ticks()
+	d2 := t2 - t1
+	println(' * wyhash4: ${d2}ms')
+	start_pos = 0
+	for len in str_lens {
+		end_pos := start_pos + len
+		str := string(bytepile[start_pos..end_pos],len)
+		_ = fnv1a.sum64_string(str)
+		start_pos = end_pos
+	}
+	t3 := time.ticks()
+	d3 := t3 - t2
+	println(' * fnv1a64: ${d3}ms')
+}