From 28bdd0f7b75356b337ddb026992e92e4955c8890 Mon Sep 17 00:00:00 2001
From: Andrea Mazzoleni <amadvance@gmail.com>
Date: Tue, 20 Aug 2013 18:55:54 +0200
Subject: [PATCH] Adds the speed test for CRC.

---
 speed.c | 19 +++++++++++++++++++
 util.c  |  4 ++--
 util.h  |  2 ++
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/speed.c b/speed.c
index c080181c..9aa164e8 100644
--- a/speed.c
+++ b/speed.c
@@ -161,6 +161,25 @@ void speed(void)
 
 	printf("memset0 %"PRIu64" [MB/s]\n", ds / dt);
 
+	SPEED_START {
+		for(j=0;j<diskmax;++j) {
+			crc32c_gen(0, buffer[j], block_size);
+		}
+	} SPEED_STOP
+
+	printf("CRC table %"PRIu64" [MB/s]\n", ds / dt);
+
+#if defined(__i386__) || defined(__x86_64__)
+	if (cpu_has_sse42()) {
+		SPEED_START {
+			for(j=0;j<diskmax;++j) {
+				crc32c_x86(0, buffer[j], block_size);
+			}
+		} SPEED_STOP
+
+		printf("CRC intel-crc32l %"PRIu64" [MB/s]\n", ds / dt);
+	}
+#endif
 	SPEED_START {
 		for(j=0;j<diskmax;++j) {
 			memhash(HASH_MURMUR3, seed, digest, buffer[j], block_size);
diff --git a/util.c b/util.c
index 3523004c..17d8954d 100644
--- a/util.c
+++ b/util.c
@@ -1067,7 +1067,7 @@ static uint32_t CRC32C_3[256] = {
  */
 #define CRC_IV 0xffffffffU
 
-static uint32_t crc32c_gen(uint32_t crc, const unsigned char* ptr, unsigned size)
+uint32_t crc32c_gen(uint32_t crc, const unsigned char* ptr, unsigned size)
 {
 	crc ^= CRC_IV;
 
@@ -1091,7 +1091,7 @@ static uint32_t crc32c_gen(uint32_t crc, const unsigned char* ptr, unsigned size
 
 #if defined(__i386__) || defined(__x86_64__)
 
-static uint32_t crc32c_x86(uint32_t crc, const unsigned char* ptr, unsigned size)
+uint32_t crc32c_x86(uint32_t crc, const unsigned char* ptr, unsigned size)
 {
 	crc ^= CRC_IV;
 
diff --git a/util.h b/util.h
index 1aef6d15..6635667b 100644
--- a/util.h
+++ b/util.h
@@ -500,6 +500,8 @@ void randomize(void* ptr, unsigned size);
  * Computes the CRC-32 (Castagnoli)
  */
 uint32_t (*crc32c)(uint32_t crc, const unsigned char* ptr, unsigned size);
+uint32_t crc32c_gen(uint32_t crc, const unsigned char* ptr, unsigned size);
+uint32_t crc32c_x86(uint32_t crc, const unsigned char* ptr, unsigned size);
 
 /**
  * Initializes the CRC-32 (Castagnoli) support.