From: Yerden Zhumabekov <e_zhumabekov@sts.kz>
Date: Thu, 29 Jan 2015 08:48:59 +0000 (+0600)
Subject: hash: add assembly implementation of CRC32 intrinsics
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=00bf774bab0beec54427bacb09137c7d6d83e819;p=dpdk.git

hash: add assembly implementation of CRC32 intrinsics

Added:
- crc32c_sse42_u32() emits 'crc32l' asm instruction;
- crc32c_sse42_u64() emits 'crc32q' asm instruction;
- crc32c_sse42_u64_mimic(), wrapper in case of run on 32-bit platform.

Signed-off-by: Yerden Zhumabekov <e_zhumabekov@sts.kz>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
---

diff --git a/lib/librte_hash/rte_hash_crc.h b/lib/librte_hash/rte_hash_crc.h
index 4da7ca432b..fe35996616 100644
--- a/lib/librte_hash/rte_hash_crc.h
+++ b/lib/librte_hash/rte_hash_crc.h
@@ -363,6 +363,40 @@ crc32c_2words(uint64_t data, uint32_t init_val)
 	return crc;
 }
 
+static inline uint32_t
+crc32c_sse42_u32(uint32_t data, uint32_t init_val)
+{
+	__asm__ volatile(
+			"crc32l %[data], %[init_val];"
+			: [init_val] "+r" (init_val)
+			: [data] "rm" (data));
+	return init_val;
+}
+
+static inline uint32_t
+crc32c_sse42_u64(uint64_t data, uint64_t init_val)
+{
+	__asm__ volatile(
+			"crc32q %[data], %[init_val];"
+			: [init_val] "+r" (init_val)
+			: [data] "rm" (data));
+	return init_val;
+}
+
+static inline uint32_t
+crc32c_sse42_u64_mimic(uint64_t data, uint64_t init_val)
+{
+	union {
+		uint32_t u32[2];
+		uint64_t u64;
+	} d;
+
+	d.u64 = data;
+	init_val = crc32c_sse42_u32(d.u32[0], init_val);
+	init_val = crc32c_sse42_u32(d.u32[1], init_val);
+	return init_val;
+}
+
 /**
  * Use single crc32 instruction to perform a hash on a 4 byte value.
  *