eal/ppc: vector memcpy for IBM Power

The SSE based memory copy in DPDK only support x86. This patch adds
altivec based memory copy functions for IBM Power architecture. This
patch includes altivec.h which requires GCC version>= 4.8.

Signed-off-by: Chao Zhu <chaozhu@linux.vnet.ibm.com>
Acked-by: David Marchand <david.marchand@6wind.com>

diff --git a/lib/librte_eal/common/include/arch/ppc_64/rte_memcpy.h b/lib/librte_eal/common/include/arch/ppc_64/rte_memcpy.h
new file mode 100644 (file)
index 0000000..31daa0d
--- /dev/null
+++ b/lib/librte_eal/common/include/arch/ppc_64/rte_memcpy.h
@@ -0,0 +1,225 @@
+/*
+ *   BSD LICENSE
+ *
+ *   Copyright (C) IBM Corporation 2014.
+ *
+ *   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 IBM Corporation 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.
+*/
+
+#ifndef _RTE_MEMCPY_PPC_64_H_
+#define _RTE_MEMCPY_PPC_64_H_
+
+#include <stdint.h>
+#include <string.h>
+/*To include altivec.h, GCC version must  >= 4.8 */
+#include <altivec.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_memcpy.h"
+
+static inline void
+rte_mov16(uint8_t *dst, const uint8_t *src)
+{
+       vec_vsx_st(vec_vsx_ld(0, src), 0, dst);
+}
+
+static inline void
+rte_mov32(uint8_t *dst, const uint8_t *src)
+{
+       vec_vsx_st(vec_vsx_ld(0, src), 0, dst);
+       vec_vsx_st(vec_vsx_ld(16, src), 16, dst);
+}
+
+static inline void
+rte_mov48(uint8_t *dst, const uint8_t *src)
+{
+       vec_vsx_st(vec_vsx_ld(0, src), 0, dst);
+       vec_vsx_st(vec_vsx_ld(16, src), 16, dst);
+       vec_vsx_st(vec_vsx_ld(32, src), 32, dst);
+}
+
+static inline void
+rte_mov64(uint8_t *dst, const uint8_t *src)
+{
+       vec_vsx_st(vec_vsx_ld(0, src), 0, dst);
+       vec_vsx_st(vec_vsx_ld(16, src), 16, dst);
+       vec_vsx_st(vec_vsx_ld(32, src), 32, dst);
+       vec_vsx_st(vec_vsx_ld(48, src), 48, dst);
+}
+
+static inline void
+rte_mov128(uint8_t *dst, const uint8_t *src)
+{
+       vec_vsx_st(vec_vsx_ld(0, src), 0, dst);
+       vec_vsx_st(vec_vsx_ld(16, src), 16, dst);
+       vec_vsx_st(vec_vsx_ld(32, src), 32, dst);
+       vec_vsx_st(vec_vsx_ld(48, src), 48, dst);
+       vec_vsx_st(vec_vsx_ld(64, src), 64, dst);
+       vec_vsx_st(vec_vsx_ld(80, src), 80, dst);
+       vec_vsx_st(vec_vsx_ld(96, src), 96, dst);
+       vec_vsx_st(vec_vsx_ld(112, src), 112, dst);
+}
+
+static inline void
+rte_mov256(uint8_t *dst, const uint8_t *src)
+{
+       rte_mov128(dst, src);
+       rte_mov128(dst + 128, src + 128);
+}
+
+#define rte_memcpy(dst, src, n)              \
+       ((__builtin_constant_p(n)) ?          \
+       memcpy((dst), (src), (n)) :          \
+       rte_memcpy_func((dst), (src), (n)))
+
+static inline void *
+rte_memcpy_func(void *dst, const void *src, size_t n)
+{
+       void *ret = dst;
+
+       /* We can't copy < 16 bytes using XMM registers so do it manually. */
+       if (n < 16) {
+               if (n & 0x01) {
+                       *(uint8_t *)dst = *(const uint8_t *)src;
+                       dst = (uint8_t *)dst + 1;
+                       src = (const uint8_t *)src + 1;
+               }
+               if (n & 0x02) {
+                       *(uint16_t *)dst = *(const uint16_t *)src;
+                       dst = (uint16_t *)dst + 1;
+                       src = (const uint16_t *)src + 1;
+               }
+               if (n & 0x04) {
+                       *(uint32_t *)dst = *(const uint32_t *)src;
+                       dst = (uint32_t *)dst + 1;
+                       src = (const uint32_t *)src + 1;
+               }
+               if (n & 0x08)
+                       *(uint64_t *)dst = *(const uint64_t *)src;
+               return ret;
+       }
+
+       /* Special fast cases for <= 128 bytes */
+       if (n <= 32) {
+               rte_mov16((uint8_t *)dst, (const uint8_t *)src);
+               rte_mov16((uint8_t *)dst - 16 + n,
+                       (const uint8_t *)src - 16 + n);
+               return ret;
+       }
+
+       if (n <= 64) {
+               rte_mov32((uint8_t *)dst, (const uint8_t *)src);
+               rte_mov32((uint8_t *)dst - 32 + n,
+                       (const uint8_t *)src - 32 + n);
+               return ret;
+       }
+
+       if (n <= 128) {
+               rte_mov64((uint8_t *)dst, (const uint8_t *)src);
+               rte_mov64((uint8_t *)dst - 64 + n,
+                       (const uint8_t *)src - 64 + n);
+               return ret;
+       }
+
+       /*
+        * For large copies > 128 bytes. This combination of 256, 64 and 16 byte
+        * copies was found to be faster than doing 128 and 32 byte copies as
+        * well.
+        */
+       for ( ; n >= 256; n -= 256) {
+               rte_mov256((uint8_t *)dst, (const uint8_t *)src);
+               dst = (uint8_t *)dst + 256;
+               src = (const uint8_t *)src + 256;
+       }
+
+       /*
+        * We split the remaining bytes (which will be less than 256) into
+        * 64byte (2^6) chunks.
+        * Using incrementing integers in the case labels of a switch statement
+        * enourages the compiler to use a jump table. To get incrementing
+        * integers, we shift the 2 relevant bits to the LSB position to first
+        * get decrementing integers, and then subtract.
+        */
+       switch (3 - (n >> 6)) {
+       case 0x00:
+               rte_mov64((uint8_t *)dst, (const uint8_t *)src);
+               n -= 64;
+               dst = (uint8_t *)dst + 64;
+               src = (const uint8_t *)src + 64;      /* fallthrough */
+       case 0x01:
+               rte_mov64((uint8_t *)dst, (const uint8_t *)src);
+               n -= 64;
+               dst = (uint8_t *)dst + 64;
+               src = (const uint8_t *)src + 64;      /* fallthrough */
+       case 0x02:
+               rte_mov64((uint8_t *)dst, (const uint8_t *)src);
+               n -= 64;
+               dst = (uint8_t *)dst + 64;
+               src = (const uint8_t *)src + 64;      /* fallthrough */
+       default:
+               ;
+       }
+
+       /*
+        * We split the remaining bytes (which will be less than 64) into
+        * 16byte (2^4) chunks, using the same switch structure as above.
+        */
+       switch (3 - (n >> 4)) {
+       case 0x00:
+               rte_mov16((uint8_t *)dst, (const uint8_t *)src);
+               n -= 16;
+               dst = (uint8_t *)dst + 16;
+               src = (const uint8_t *)src + 16;      /* fallthrough */
+       case 0x01:
+               rte_mov16((uint8_t *)dst, (const uint8_t *)src);
+               n -= 16;
+               dst = (uint8_t *)dst + 16;
+               src = (const uint8_t *)src + 16;      /* fallthrough */
+       case 0x02:
+               rte_mov16((uint8_t *)dst, (const uint8_t *)src);
+               n -= 16;
+               dst = (uint8_t *)dst + 16;
+               src = (const uint8_t *)src + 16;      /* fallthrough */
+       default:
+               ;
+       }
+
+       /* Copy any remaining bytes, without going beyond end of buffers */
+       if (n != 0)
+               rte_mov16((uint8_t *)dst - 16 + n,
+                       (const uint8_t *)src - 16 + n);
+       return ret;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_MEMCPY_PPC_64_H_ */