#include "generic/rte_memcpy.h"
+#ifdef RTE_ARCH_ARM64_MEMCPY
+#include <rte_common.h>
+#include <rte_branch_prediction.h>
+
+/*
+ * The memory copy performance differs on different AArch64 micro-architectures.
+ * And the most recent glibc (e.g. 2.23 or later) can provide a better memcpy()
+ * performance compared to old glibc versions. It's always suggested to use a
+ * more recent glibc if possible, from which the entire system can get benefit.
+ *
+ * This implementation improves memory copy on some aarch64 micro-architectures,
+ * when an old glibc (e.g. 2.19, 2.17...) is being used. It is disabled by
+ * default and needs "RTE_ARCH_ARM64_MEMCPY" defined to activate. It's not
+ * always providing better performance than memcpy() so users need to run unit
+ * test "memcpy_perf_autotest" and customize parameters in customization section
+ * below for best performance.
+ *
+ * Compiler version will also impact the rte_memcpy() performance. It's observed
+ * on some platforms and with the same code, GCC 7.2.0 compiled binaries can
+ * provide better performance than GCC 4.8.5 compiled binaries.
+ */
+
+/**************************************
+ * Beginning of customization section
+ **************************************/
+#ifndef RTE_ARM64_MEMCPY_ALIGN_MASK
+#define RTE_ARM64_MEMCPY_ALIGN_MASK ((RTE_CACHE_LINE_SIZE >> 3) - 1)
+#endif
+
+#ifndef RTE_ARM64_MEMCPY_STRICT_ALIGN
+/* Only src unalignment will be treated as unaligned copy */
+#define RTE_ARM64_MEMCPY_IS_UNALIGNED_COPY(dst, src) \
+ ((uintptr_t)(src) & RTE_ARM64_MEMCPY_ALIGN_MASK)
+#else
+/* Both dst and src unalignment will be treated as unaligned copy */
+#define RTE_ARM64_MEMCPY_IS_UNALIGNED_COPY(dst, src) \
+ (((uintptr_t)(dst) | (uintptr_t)(src)) & RTE_ARM64_MEMCPY_ALIGN_MASK)
+#endif
+
+
+/*
+ * If copy size is larger than threshold, memcpy() will be used.
+ * Run "memcpy_perf_autotest" to determine the proper threshold.
+ */
+#ifdef RTE_ARM64_MEMCPY_ALIGNED_THRESHOLD
+#define USE_ALIGNED_RTE_MEMCPY(dst, src, n) \
+(!RTE_ARM64_MEMCPY_IS_UNALIGNED_COPY(dst, src) && \
+n <= (size_t)RTE_ARM64_MEMCPY_ALIGNED_THRESHOLD)
+#else
+#define USE_ALIGNED_RTE_MEMCPY(dst, src, n) \
+(!RTE_ARM64_MEMCPY_IS_UNALIGNED_COPY(dst, src))
+#endif
+#ifdef RTE_ARM64_MEMCPY_UNALIGNED_THRESHOLD
+#define USE_UNALIGNED_RTE_MEMCPY(dst, src, n) \
+(RTE_ARM64_MEMCPY_IS_UNALIGNED_COPY(dst, src) && \
+n <= (size_t)RTE_ARM64_MEMCPY_UNALIGNED_THRESHOLD)
+#else
+#define USE_UNALIGNED_RTE_MEMCPY(dst, src, n) \
+(RTE_ARM64_MEMCPY_IS_UNALIGNED_COPY(dst, src))
+#endif
+/*
+ * The logic of USE_RTE_MEMCPY() can also be modified to best fit platform.
+ */
+#if defined(RTE_ARM64_MEMCPY_ALIGNED_THRESHOLD) \
+|| defined(RTE_ARM64_MEMCPY_UNALIGNED_THRESHOLD)
+#define USE_RTE_MEMCPY(dst, src, n) \
+(USE_ALIGNED_RTE_MEMCPY(dst, src, n) || USE_UNALIGNED_RTE_MEMCPY(dst, src, n))
+#else
+#define USE_RTE_MEMCPY(dst, src, n) (1)
+#endif
+/**************************************
+ * End of customization section
+ **************************************/
+
+
+#if RTE_CC_IS_GNU && !defined RTE_ARM64_MEMCPY_SKIP_GCC_VER_CHECK
+#if (GCC_VERSION < 50400)
+#warning "The GCC version is quite old, which may result in sub-optimal \
+performance of the compiled code. It is suggested that at least GCC 5.4.0 \
+be used."
+#endif
+#endif
+
+static __rte_always_inline
+void rte_mov16(uint8_t *dst, const uint8_t *src)
+{
+ __uint128_t *dst128 = (__uint128_t *)dst;
+ const __uint128_t *src128 = (const __uint128_t *)src;
+ *dst128 = *src128;
+}
+
+static __rte_always_inline
+void rte_mov32(uint8_t *dst, const uint8_t *src)
+{
+ __uint128_t *dst128 = (__uint128_t *)dst;
+ const __uint128_t *src128 = (const __uint128_t *)src;
+ const __uint128_t x0 = src128[0], x1 = src128[1];
+ dst128[0] = x0;
+ dst128[1] = x1;
+}
+
+static __rte_always_inline
+void rte_mov48(uint8_t *dst, const uint8_t *src)
+{
+ __uint128_t *dst128 = (__uint128_t *)dst;
+ const __uint128_t *src128 = (const __uint128_t *)src;
+ const __uint128_t x0 = src128[0], x1 = src128[1], x2 = src128[2];
+ dst128[0] = x0;
+ dst128[1] = x1;
+ dst128[2] = x2;
+}
+
+static __rte_always_inline
+void rte_mov64(uint8_t *dst, const uint8_t *src)
+{
+ __uint128_t *dst128 = (__uint128_t *)dst;
+ const __uint128_t *src128 = (const __uint128_t *)src;
+ const __uint128_t
+ x0 = src128[0], x1 = src128[1], x2 = src128[2], x3 = src128[3];
+ dst128[0] = x0;
+ dst128[1] = x1;
+ dst128[2] = x2;
+ dst128[3] = x3;
+}
+
+static __rte_always_inline
+void rte_mov128(uint8_t *dst, const uint8_t *src)
+{
+ __uint128_t *dst128 = (__uint128_t *)dst;
+ const __uint128_t *src128 = (const __uint128_t *)src;
+ /* Keep below declaration & copy sequence for optimized instructions */
+ const __uint128_t
+ x0 = src128[0], x1 = src128[1], x2 = src128[2], x3 = src128[3];
+ dst128[0] = x0;
+ __uint128_t x4 = src128[4];
+ dst128[1] = x1;
+ __uint128_t x5 = src128[5];
+ dst128[2] = x2;
+ __uint128_t x6 = src128[6];
+ dst128[3] = x3;
+ __uint128_t x7 = src128[7];
+ dst128[4] = x4;
+ dst128[5] = x5;
+ dst128[6] = x6;
+ dst128[7] = x7;
+}
+
+static __rte_always_inline
+void rte_mov256(uint8_t *dst, const uint8_t *src)
+{
+ rte_mov128(dst, src);
+ rte_mov128(dst + 128, src + 128);
+}
+
+static __rte_always_inline void
+rte_memcpy_lt16(uint8_t *dst, const uint8_t *src, size_t n)
+{
+ if (n & 0x08) {
+ /* copy 8 ~ 15 bytes */
+ *(uint64_t *)dst = *(const uint64_t *)src;
+ *(uint64_t *)(dst - 8 + n) = *(const uint64_t *)(src - 8 + n);
+ } else if (n & 0x04) {
+ /* copy 4 ~ 7 bytes */
+ *(uint32_t *)dst = *(const uint32_t *)src;
+ *(uint32_t *)(dst - 4 + n) = *(const uint32_t *)(src - 4 + n);
+ } else if (n & 0x02) {
+ /* copy 2 ~ 3 bytes */
+ *(uint16_t *)dst = *(const uint16_t *)src;
+ *(uint16_t *)(dst - 2 + n) = *(const uint16_t *)(src - 2 + n);
+ } else if (n & 0x01) {
+ /* copy 1 byte */
+ *dst = *src;
+ }
+}
+
+static __rte_always_inline
+void rte_memcpy_ge16_lt128(uint8_t *dst, const uint8_t *src, size_t n)
+{
+ if (n < 64) {
+ if (n == 16) {
+ rte_mov16(dst, src);
+ } else if (n <= 32) {
+ rte_mov16(dst, src);
+ rte_mov16(dst - 16 + n, src - 16 + n);
+ } else if (n <= 48) {
+ rte_mov32(dst, src);
+ rte_mov16(dst - 16 + n, src - 16 + n);
+ } else {
+ rte_mov48(dst, src);
+ rte_mov16(dst - 16 + n, src - 16 + n);
+ }
+ } else {
+ rte_mov64((uint8_t *)dst, (const uint8_t *)src);
+ if (n > 48 + 64)
+ rte_mov64(dst - 64 + n, src - 64 + n);
+ else if (n > 32 + 64)
+ rte_mov48(dst - 48 + n, src - 48 + n);
+ else if (n > 16 + 64)
+ rte_mov32(dst - 32 + n, src - 32 + n);
+ else if (n > 64)
+ rte_mov16(dst - 16 + n, src - 16 + n);
+ }
+}
+
+static __rte_always_inline
+void rte_memcpy_ge128(uint8_t *dst, const uint8_t *src, size_t n)
+{
+ do {
+ rte_mov128(dst, src);
+ src += 128;
+ dst += 128;
+ n -= 128;
+ } while (likely(n >= 128));
+
+ if (likely(n)) {
+ if (n <= 16)
+ rte_mov16(dst - 16 + n, src - 16 + n);
+ else if (n <= 32)
+ rte_mov32(dst - 32 + n, src - 32 + n);
+ else if (n <= 48)
+ rte_mov48(dst - 48 + n, src - 48 + n);
+ else if (n <= 64)
+ rte_mov64(dst - 64 + n, src - 64 + n);
+ else
+ rte_memcpy_ge16_lt128(dst, src, n);
+ }
+}
+
+static __rte_always_inline
+void rte_memcpy_ge16_lt64(uint8_t *dst, const uint8_t *src, size_t n)
+{
+ if (n == 16) {
+ rte_mov16(dst, src);
+ } else if (n <= 32) {
+ rte_mov16(dst, src);
+ rte_mov16(dst - 16 + n, src - 16 + n);
+ } else if (n <= 48) {
+ rte_mov32(dst, src);
+ rte_mov16(dst - 16 + n, src - 16 + n);
+ } else {
+ rte_mov48(dst, src);
+ rte_mov16(dst - 16 + n, src - 16 + n);
+ }
+}
+
+static __rte_always_inline
+void rte_memcpy_ge64(uint8_t *dst, const uint8_t *src, size_t n)
+{
+ do {
+ rte_mov64(dst, src);
+ src += 64;
+ dst += 64;
+ n -= 64;
+ } while (likely(n >= 64));
+
+ if (likely(n)) {
+ if (n <= 16)
+ rte_mov16(dst - 16 + n, src - 16 + n);
+ else if (n <= 32)
+ rte_mov32(dst - 32 + n, src - 32 + n);
+ else if (n <= 48)
+ rte_mov48(dst - 48 + n, src - 48 + n);
+ else
+ rte_mov64(dst - 64 + n, src - 64 + n);
+ }
+}
+
+#if RTE_CACHE_LINE_SIZE >= 128
+static __rte_always_inline
+void *rte_memcpy(void *dst, const void *src, size_t n)
+{
+ if (n < 16) {
+ rte_memcpy_lt16((uint8_t *)dst, (const uint8_t *)src, n);
+ return dst;
+ }
+ if (n < 128) {
+ rte_memcpy_ge16_lt128((uint8_t *)dst, (const uint8_t *)src, n);
+ return dst;
+ }
+ __builtin_prefetch(src, 0, 0);
+ __builtin_prefetch(dst, 1, 0);
+ if (likely(USE_RTE_MEMCPY(dst, src, n))) {
+ rte_memcpy_ge128((uint8_t *)dst, (const uint8_t *)src, n);
+ return dst;
+ } else
+ return memcpy(dst, src, n);
+}
+
+#else
+static __rte_always_inline
+void *rte_memcpy(void *dst, const void *src, size_t n)
+{
+ if (n < 16) {
+ rte_memcpy_lt16((uint8_t *)dst, (const uint8_t *)src, n);
+ return dst;
+ }
+ if (n < 64) {
+ rte_memcpy_ge16_lt64((uint8_t *)dst, (const uint8_t *)src, n);
+ return dst;
+ }
+ __builtin_prefetch(src, 0, 0);
+ __builtin_prefetch(dst, 1, 0);
+ if (likely(USE_RTE_MEMCPY(dst, src, n))) {
+ rte_memcpy_ge64((uint8_t *)dst, (const uint8_t *)src, n);
+ return dst;
+ } else
+ return memcpy(dst, src, n);
+}
+#endif /* RTE_CACHE_LINE_SIZE >= 128 */
+
+#else
static inline void
rte_mov16(uint8_t *dst, const uint8_t *src)
{
#define rte_memcpy(d, s, n) memcpy((d), (s), (n))
+#endif /* RTE_ARCH_ARM64_MEMCPY */
+
#ifdef __cplusplus
}
#endif
git.droids-corp.org / dpdk.git / blobdiff