Some optimizations

common/crc32.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <stdint.h>
+
+static inline uint32_t
+crc32_u8(uint8_t v, uint32_t hash) {
+	return __builtin_ia32_crc32qi(hash, v);
+}
+
+static inline uint32_t
+crc32_u16(uint16_t v, uint32_t hash) {
+	return __builtin_ia32_crc32hi(hash, v);
+}
+
+static inline uint32_t
+crc32_u32(uint32_t v, uint32_t hash) {
+	return __builtin_ia32_crc32si(hash, v);
+}
+
+static inline uint32_t
+crc32_u64(uint64_t v, uint32_t hash) {
+	return __builtin_ia32_crc32qi(hash, v);
+}
+
+static inline uint32_t
+crc32(const void *data, uint64_t size, uint32_t hash) {
+
+	for (uint64_t idx = 0; idx < size / 8; ++idx) {
+		hash = crc32_u64(*(const uint64_t *)data, hash);
+		data += 8;
+	}
+
+	if (size & 0x4) {
+		hash = crc32_u32(*(const uint32_t *)data, hash);
+		data += 4;
+	}
+
+	if (size & 0x2) {
+		hash = crc32_u16(*(const uint16_t *)data, hash);
+		data += 2;
+	}
+
+	if (size & 0x1)
+		hash = crc32_u8(*(const uint8_t *)data, hash);
+
+	return hash;
+}