From b4bd28a490012ecbce292561da404d4e9b02d24b Mon Sep 17 00:00:00 2001
From: Christophe Fontaine <christophe.fontaine@enea.com>
Date: Wed, 31 May 2017 11:27:19 +0200
Subject: Remove calls to crc_u32 and add clib_crc32c for armv8+crc

crc_u32 was not defined for non x86_64 with SSE4.2 processors.

Calls to "crc_u32" are removed and replaced by either a call to
clib_crc32c or a call to clib_xxhash, as the result is not used
as a check value but as a hash.

Change-Id: I3af4d68e2e5ebd0c9b0a6090f848d043cb0f20a2
Signed-off-by: Christophe Fontaine <christophe.fontaine@enea.com>
---
 src/vppinfra/bihash_16_8.h | 30 ++++--------------------------
 src/vppinfra/bihash_24_8.h |  4 ++--
 src/vppinfra/bihash_48_8.h | 38 ++++----------------------------------
 src/vppinfra/crc32.h       | 26 +++++++++++++++++++++++++-
 4 files changed, 35 insertions(+), 63 deletions(-)

(limited to 'src/vppinfra')

diff --git a/src/vppinfra/bihash_16_8.h b/src/vppinfra/bihash_16_8.h
index ce80f70e50a..6b1b563e25b 100644
--- a/src/vppinfra/bihash_16_8.h
+++ b/src/vppinfra/bihash_16_8.h
@@ -24,6 +24,7 @@
 #include <vppinfra/format.h>
 #include <vppinfra/pool.h>
 #include <vppinfra/xxhash.h>
+#include <vppinfra/crc32.h>
 
 typedef struct
 {
@@ -40,39 +41,16 @@ clib_bihash_is_free_16_8 (clib_bihash_kv_16_8_t * v)
   return 0;
 }
 
-#if __SSE4_2__
-#ifndef __defined_crc_u32__
-#define __defined_crc_u32__
-static inline u32
-crc_u32 (u32 data, u32 value)
-{
-  __asm__ volatile ("crc32l %[data], %[value];":[value] "+r" (value):[data]
-		    "rm" (data));
-  return value;
-}
-#endif /* __defined_crc_u32__ */
-
 static inline u64
 clib_bihash_hash_16_8 (clib_bihash_kv_16_8_t * v)
 {
-  u32 *dp = (u32 *) & v->key[0];
-  u32 value = 0;
-
-  value = crc_u32 (dp[0], value);
-  value = crc_u32 (dp[1], value);
-  value = crc_u32 (dp[2], value);
-  value = crc_u32 (dp[3], value);
-
-  return value;
-}
+#ifdef clib_crc32c_uses_intrinsics
+  return clib_crc32c ((u8 *) v->key, 16);
 #else
-static inline u64
-clib_bihash_hash_16_8 (clib_bihash_kv_16_8_t * v)
-{
   u64 tmp = v->key[0] ^ v->key[1];
   return clib_xxhash (tmp);
-}
 #endif
+}
 
 static inline u8 *
 format_bihash_kvp_16_8 (u8 * s, va_list * args)
diff --git a/src/vppinfra/bihash_24_8.h b/src/vppinfra/bihash_24_8.h
index 655dab8015f..db77daa4e2c 100644
--- a/src/vppinfra/bihash_24_8.h
+++ b/src/vppinfra/bihash_24_8.h
@@ -20,11 +20,11 @@
 #ifndef __included_bihash_24_8_h__
 #define __included_bihash_24_8_h__
 
+#include <vppinfra/crc32.h>
 #include <vppinfra/heap.h>
 #include <vppinfra/format.h>
 #include <vppinfra/pool.h>
 #include <vppinfra/xxhash.h>
-#include <vppinfra/crc32.h>
 
 typedef struct
 {
@@ -44,7 +44,7 @@ clib_bihash_is_free_24_8 (const clib_bihash_kv_24_8_t * v)
 static inline u64
 clib_bihash_hash_24_8 (const clib_bihash_kv_24_8_t * v)
 {
-#if __SSE4_2__
+#ifdef clib_crc32c_uses_intrinsics
   return clib_crc32c ((u8 *) v->key, 24);
 #else
   u64 tmp = v->key[0] ^ v->key[1] ^ v->key[2];
diff --git a/src/vppinfra/bihash_48_8.h b/src/vppinfra/bihash_48_8.h
index 1a6e76913ed..48079e0a1cf 100644
--- a/src/vppinfra/bihash_48_8.h
+++ b/src/vppinfra/bihash_48_8.h
@@ -21,6 +21,7 @@
 #ifndef __included_bihash_48_8_h__
 #define __included_bihash_48_8_h__
 
+#include <vppinfra/crc32.h>
 #include <vppinfra/heap.h>
 #include <vppinfra/format.h>
 #include <vppinfra/pool.h>
@@ -41,48 +42,17 @@ clib_bihash_is_free_48_8 (const clib_bihash_kv_48_8_t * v)
   return 0;
 }
 
-#if __SSE4_2__
-#ifndef __defined_crc_u32__
-#define __defined_crc_u32__
-static inline u32
-crc_u32 (u32 data, u32 value)
-{
-  __asm__ volatile ("crc32l %[data], %[value];":[value] "+r" (value):[data]
-		    "rm" (data));
-  return value;
-}
-#endif /* __defined_crc_u32__ */
-
 static inline u64
 clib_bihash_hash_48_8 (const clib_bihash_kv_48_8_t * v)
 {
-  const u32 *dp = (const u32 *) &v->key[0];
-  u32 value = 0;
-
-  value = crc_u32 (dp[0], value);
-  value = crc_u32 (dp[1], value);
-  value = crc_u32 (dp[2], value);
-  value = crc_u32 (dp[3], value);
-  value = crc_u32 (dp[4], value);
-  value = crc_u32 (dp[5], value);
-  value = crc_u32 (dp[6], value);
-  value = crc_u32 (dp[7], value);
-  value = crc_u32 (dp[8], value);
-  value = crc_u32 (dp[9], value);
-  value = crc_u32 (dp[10], value);
-  value = crc_u32 (dp[11], value);
-
-  return value;
-}
+#ifdef clib_crc32c_uses_intrinsics
+  return clib_crc32c ((u8 *) v->key, 48);
 #else
-static inline u64
-clib_bihash_hash_48_8 (const clib_bihash_kv_48_8_t * v)
-{
   u64 tmp = v->key[0] ^ v->key[1] ^ v->key[2] ^ v->key[3] ^ v->key[4]
     ^ v->key[5];
   return clib_xxhash (tmp);
-}
 #endif
+}
 
 static inline u8 *
 format_bihash_kvp_48_8 (u8 * s, va_list * args)
diff --git a/src/vppinfra/crc32.h b/src/vppinfra/crc32.h
index abb2953fb4d..5a47236a2ba 100644
--- a/src/vppinfra/crc32.h
+++ b/src/vppinfra/crc32.h
@@ -17,6 +17,7 @@
 #define __included_crc32_h__
 
 #if __SSE4_2__
+#define clib_crc32c_uses_intrinsics
 #include <x86intrin.h>
 
 static_always_inline u32
@@ -45,8 +46,31 @@ clib_crc32c (u8 * s, int len)
   return v;
 }
 
-#endif
+#elif __ARM_FEATURE_CRC32
+#define clib_crc32c_with_intrinsics
+#include <arm_acle.h>
+
+static_always_inline u32
+clib_crc32c (u8 * s, int len)
+{
+  u32 v = 0;
+
+  for (; len >= 8; len -= 8, s += 8)
+    v = __crc32cd (v, *((u64 *) s));
+
+  for (; len >= 4; len -= 4, s += 4)
+    v = __crc32cw (v, *((u32 *) s));
+
+  for (; len >= 2; len -= 2, s += 2)
+    v = __crc32ch (v, *((u16 *) s));
+
+  for (; len >= 1; len -= 1, s += 1)
+    v = __crc32cb (v, *((u8 *) s));
 
+  return v;
+}
+
+#endif
 #endif /* __included_crc32_h__ */
 
 /*
-- 
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