vppinfra: vectorized index to pointer function
Type: improvement
Change-Id: I05e1a8fa31761b113355123429d72da18881d4b0
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vppinfra/vector/index_to_ptr.h b/src/vppinfra/vector/index_to_ptr.h
new file mode 100644
index 0000000..91de354
--- /dev/null
+++ b/src/vppinfra/vector/index_to_ptr.h
@@ -0,0 +1,254 @@
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright(c) 2021 Cisco Systems, Inc.
+ */
+
+#ifndef included_vector_index_to_ptr_h
+#define included_vector_index_to_ptr_h
+#include <vppinfra/clib.h>
+
+#ifdef CLIB_HAVE_VEC128
+static_always_inline void
+clib_index_to_ptr_u32x4 (u32 *indices, void **ptrs, i32 i, u64x2 ov, u8 shift)
+{
+ u32x4 iv4 = u32x4_load_unaligned (indices + i);
+ u64x2 pv2;
+ pv2 = u64x2_from_u32x4 (iv4);
+ u64x2_store_unaligned ((pv2 << shift) + ov, ptrs + i);
+#ifdef __aarch64__
+ pv2 = u64x2_from_u32x4_high (iv4);
+#else
+ pv2 = u64x2_from_u32x4 ((u32x4) u8x16_word_shift_right (iv4, 8));
+#endif
+ u64x2_store_unaligned ((pv2 << shift) + ov, ptrs + i + 2);
+}
+#endif
+
+/** \brief Convert array of indices to pointers with base and shift
+
+ @param indices source array of u32 indices
+ @param base base pointer
+ @param shift numbers of bits to be shifted
+ @param ptrs destinatin array of pointers
+ @param n_elts number of elements in the source array
+*/
+
+static_always_inline void
+clib_index_to_ptr_u32 (u32 *indices, void *base, u8 shift, void **ptrs,
+ u32 n_elts)
+{
+#if defined CLIB_HAVE_VEC512
+ if (n_elts >= 8)
+ {
+ u64x8 off = u64x8_splat ((u64) base);
+ u64x8 b0, b1, b2, b3, b4, b5, b6, b7;
+
+ while (n_elts >= 64)
+ {
+ b0 = u64x8_from_u32x8 (u32x8_load_unaligned (indices));
+ b1 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 8));
+ b2 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 16));
+ b3 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 24));
+ b4 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 32));
+ b5 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 40));
+ b6 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 48));
+ b7 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 56));
+ u64x8_store_unaligned ((b0 << shift) + off, ptrs);
+ u64x8_store_unaligned ((b1 << shift) + off, ptrs + 8);
+ u64x8_store_unaligned ((b2 << shift) + off, ptrs + 16);
+ u64x8_store_unaligned ((b3 << shift) + off, ptrs + 24);
+ u64x8_store_unaligned ((b4 << shift) + off, ptrs + 32);
+ u64x8_store_unaligned ((b5 << shift) + off, ptrs + 40);
+ u64x8_store_unaligned ((b6 << shift) + off, ptrs + 48);
+ u64x8_store_unaligned ((b7 << shift) + off, ptrs + 56);
+ ptrs += 64;
+ indices += 64;
+ n_elts -= 64;
+ }
+
+ if (n_elts == 0)
+ return;
+
+ if (n_elts >= 32)
+ {
+ b0 = u64x8_from_u32x8 (u32x8_load_unaligned (indices));
+ b1 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 8));
+ b2 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 16));
+ b3 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 24));
+ u64x8_store_unaligned ((b0 << shift) + off, ptrs);
+ u64x8_store_unaligned ((b1 << shift) + off, ptrs + 8);
+ u64x8_store_unaligned ((b2 << shift) + off, ptrs + 16);
+ u64x8_store_unaligned ((b3 << shift) + off, ptrs + 24);
+ ptrs += 32;
+ indices += 32;
+ n_elts -= 32;
+ }
+ if (n_elts >= 16)
+ {
+ b0 = u64x8_from_u32x8 (u32x8_load_unaligned (indices));
+ b1 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + 8));
+ u64x8_store_unaligned ((b0 << shift) + off, ptrs);
+ u64x8_store_unaligned ((b1 << shift) + off, ptrs + 8);
+ ptrs += 16;
+ indices += 16;
+ n_elts -= 16;
+ }
+ if (n_elts > 8)
+ {
+ b0 = u64x8_from_u32x8 (u32x8_load_unaligned (indices));
+ u64x8_store_unaligned ((b0 << shift) + off, ptrs);
+ ptrs += 8;
+ indices += 8;
+ n_elts -= 8;
+ }
+
+ b0 = u64x8_from_u32x8 (u32x8_load_unaligned (indices + n_elts - 8));
+ u64x8_store_unaligned ((b0 << shift) + off, ptrs + n_elts - 8);
+ }
+ else
+ {
+ u32 mask = pow2_mask (n_elts);
+ u64x8 r = u64x8_from_u32x8 (u32x8_mask_load_zero (indices, mask));
+ u64x8_mask_store ((r << shift) + u64x8_splat ((u64) base), ptrs, mask);
+ return;
+ }
+#elif defined CLIB_HAVE_VEC256
+ if (n_elts >= 4)
+ {
+ u64x4 off = u64x4_splat ((u64) base);
+ u64x4 b0, b1, b2, b3, b4, b5, b6, b7;
+
+ while (n_elts >= 32)
+ {
+ b0 = u64x4_from_u32x4 (u32x4_load_unaligned (indices));
+ b1 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 4));
+ b2 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 8));
+ b3 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 12));
+ b4 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 16));
+ b5 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 20));
+ b6 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 24));
+ b7 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 28));
+ u64x4_store_unaligned ((b0 << shift) + off, ptrs);
+ u64x4_store_unaligned ((b1 << shift) + off, ptrs + 4);
+ u64x4_store_unaligned ((b2 << shift) + off, ptrs + 8);
+ u64x4_store_unaligned ((b3 << shift) + off, ptrs + 12);
+ u64x4_store_unaligned ((b4 << shift) + off, ptrs + 16);
+ u64x4_store_unaligned ((b5 << shift) + off, ptrs + 20);
+ u64x4_store_unaligned ((b6 << shift) + off, ptrs + 24);
+ u64x4_store_unaligned ((b7 << shift) + off, ptrs + 28);
+ ptrs += 32;
+ indices += 32;
+ n_elts -= 32;
+ }
+
+ if (n_elts == 0)
+ return;
+
+ if (n_elts >= 16)
+ {
+ b0 = u64x4_from_u32x4 (u32x4_load_unaligned (indices));
+ b1 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 4));
+ b2 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 8));
+ b3 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 12));
+ u64x4_store_unaligned ((b0 << shift) + off, ptrs);
+ u64x4_store_unaligned ((b1 << shift) + off, ptrs + 4);
+ u64x4_store_unaligned ((b2 << shift) + off, ptrs + 8);
+ u64x4_store_unaligned ((b3 << shift) + off, ptrs + 12);
+ ptrs += 16;
+ indices += 16;
+ n_elts -= 16;
+ }
+ if (n_elts >= 8)
+ {
+ b0 = u64x4_from_u32x4 (u32x4_load_unaligned (indices));
+ b1 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + 4));
+ u64x4_store_unaligned ((b0 << shift) + off, ptrs);
+ u64x4_store_unaligned ((b1 << shift) + off, ptrs + 4);
+ ptrs += 8;
+ indices += 8;
+ n_elts -= 8;
+ }
+ if (n_elts > 4)
+ {
+ b0 = u64x4_from_u32x4 (u32x4_load_unaligned (indices));
+ u64x4_store_unaligned ((b0 << shift) + off, ptrs);
+ ptrs += 4;
+ indices += 4;
+ n_elts -= 4;
+ }
+
+ b0 = u64x4_from_u32x4 (u32x4_load_unaligned (indices + n_elts - 4));
+ u64x4_store_unaligned ((b0 << shift) + off, ptrs + n_elts - 4);
+ return;
+ }
+#ifdef CLIB_HAVE_VEC256_MASK_LOAD_STORE
+ else
+ {
+ u32 mask = pow2_mask (n_elts);
+ u64x4 r = u64x4_from_u32x4 (u32x4_mask_load_zero (indices, mask));
+ u64x4_mask_store ((r << shift) + u64x4_splat ((u64) base), ptrs, mask);
+ return;
+ }
+#endif
+#elif defined(CLIB_HAVE_VEC128)
+ if (n_elts >= 4)
+ {
+ u64x2 ov = u64x2_splat ((u64) base);
+ u32 *i = (u32 *) indices;
+ void **p = (void **) ptrs;
+ u32 n = n_elts;
+
+ while (n >= 32)
+ {
+ clib_index_to_ptr_u32x4 (indices, ptrs, 0, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 4, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 8, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 12, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 16, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 20, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 24, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 28, ov, shift);
+ indices += 32;
+ ptrs += 32;
+ n -= 32;
+ }
+
+ if (n == 0)
+ return;
+
+ if (n >= 16)
+ {
+ clib_index_to_ptr_u32x4 (indices, ptrs, 0, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 4, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 8, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 12, ov, shift);
+ indices += 16;
+ ptrs += 16;
+ n -= 16;
+ }
+
+ if (n >= 8)
+ {
+ clib_index_to_ptr_u32x4 (indices, ptrs, 0, ov, shift);
+ clib_index_to_ptr_u32x4 (indices, ptrs, 4, ov, shift);
+ indices += 8;
+ ptrs += 8;
+ n -= 8;
+ }
+
+ if (n > 4)
+ clib_index_to_ptr_u32x4 (indices, ptrs, 0, ov, shift);
+
+ clib_index_to_ptr_u32x4 (i, p, n_elts - 4, ov, shift);
+ return;
+ }
+#endif
+ while (n_elts)
+ {
+ ptrs[0] = base + ((u64) indices[0] << shift);
+ ptrs += 1;
+ indices += 1;
+ n_elts -= 1;
+ }
+}
+
+#endif