[dpdk-dev] [PATCH] hash: replace libc memcmp with optimized memory compare functions for arm64
Jerin Jacob
jerin.jacob at caviumnetworks.com
Thu Nov 19 14:51:15 CET 2015
The following measurements shows improvement over the default
libc memcmp function
Length(B) by X% over libc memcmp
16 149.57%
32 122.7%
48 104.96%
64 98.21%
80 93.75%
96 90.55%
112 110.48%
128 137.24%
Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
---
lib/librte_hash/rte_cmp_arm64.h | 114 ++++++++++++++++++++++++++++++++++++++
lib/librte_hash/rte_cuckoo_hash.c | 7 ++-
2 files changed, 120 insertions(+), 1 deletion(-)
create mode 100644 lib/librte_hash/rte_cmp_arm64.h
diff --git a/lib/librte_hash/rte_cmp_arm64.h b/lib/librte_hash/rte_cmp_arm64.h
new file mode 100644
index 0000000..6fd937b
--- /dev/null
+++ b/lib/librte_hash/rte_cmp_arm64.h
@@ -0,0 +1,114 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2015 Cavium networks. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Cavium networks nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* Functions to compare multiple of 16 byte keys (up to 128 bytes) */
+static int
+rte_hash_k16_cmp_eq(const void *key1, const void *key2,
+ size_t key_len __rte_unused)
+{
+ uint64_t x0, x1, y0, y1;
+
+ asm volatile(
+ "ldp %x[x1], %x[x0], [%x[p1]]"
+ : [x1]"=r"(x1), [x0]"=r"(x0)
+ : [p1]"r"(key1)
+ );
+ asm volatile(
+ "ldp %x[y1], %x[y0], [%x[p2]]"
+ : [y1]"=r"(y1), [y0]"=r"(y0)
+ : [p2]"r"(key2)
+ );
+ x0 ^= y0;
+ x1 ^= y1;
+ return !(x0 == 0 && x1 == 0);
+}
+
+static int
+rte_hash_k32_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k16_cmp_eq((const char *) key1 + 16,
+ (const char *) key2 + 16, key_len);
+}
+
+static int
+rte_hash_k48_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k16_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k16_cmp_eq((const char *) key1 + 16,
+ (const char *) key2 + 16, key_len) ||
+ rte_hash_k16_cmp_eq((const char *) key1 + 32,
+ (const char *) key2 + 32, key_len);
+}
+
+static int
+rte_hash_k64_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k32_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k32_cmp_eq((const char *) key1 + 32,
+ (const char *) key2 + 32, key_len);
+}
+
+static int
+rte_hash_k80_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k16_cmp_eq((const char *) key1 + 64,
+ (const char *) key2 + 64, key_len);
+}
+
+static int
+rte_hash_k96_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k32_cmp_eq((const char *) key1 + 64,
+ (const char *) key2 + 64, key_len);
+}
+
+static int
+rte_hash_k112_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k32_cmp_eq((const char *) key1 + 64,
+ (const char *) key2 + 64, key_len) ||
+ rte_hash_k16_cmp_eq((const char *) key1 + 96,
+ (const char *) key2 + 96, key_len);
+}
+
+static int
+rte_hash_k128_cmp_eq(const void *key1, const void *key2, size_t key_len)
+{
+ return rte_hash_k64_cmp_eq(key1, key2, key_len) ||
+ rte_hash_k64_cmp_eq((const char *) key1 + 64,
+ (const char *) key2 + 64, key_len);
+}
diff --git a/lib/librte_hash/rte_cuckoo_hash.c b/lib/librte_hash/rte_cuckoo_hash.c
index 1e970de..e6520dd 100644
--- a/lib/librte_hash/rte_cuckoo_hash.c
+++ b/lib/librte_hash/rte_cuckoo_hash.c
@@ -63,6 +63,10 @@
#include "rte_cmp_x86.h"
#endif
+#if defined(RTE_ARCH_ARM64)
+#include "rte_cmp_arm64.h"
+#endif
+
TAILQ_HEAD(rte_hash_list, rte_tailq_entry);
static struct rte_tailq_elem rte_hash_tailq = {
@@ -280,7 +284,8 @@ rte_hash_create(const struct rte_hash_parameters *params)
* If x86 architecture is used, select appropriate compare function,
* which may use x86 instrinsics, otherwise use memcmp
*/
-#if defined(RTE_ARCH_X86_64) || defined(RTE_ARCH_I686) || defined(RTE_ARCH_X86_X32)
+#if defined(RTE_ARCH_X86_64) || defined(RTE_ARCH_I686) ||\
+ defined(RTE_ARCH_X86_X32) || defined(RTE_ARCH_ARM64)
/* Select function to compare keys */
switch (params->key_len) {
case 16:
--
2.1.0
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