| /* |
| * Copyright 2012 The LibYuv Project Authors. All rights reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "libyuv/basic_types.h" |
| |
| #include "libyuv/compare_row.h" |
| #include "libyuv/row.h" |
| |
| #ifdef __cplusplus |
| namespace libyuv { |
| extern "C" { |
| #endif |
| |
| #if !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__) |
| |
| // 256 bits at a time |
| // uses short accumulator which restricts count to 131 KB |
| uint32_t HammingDistance_NEON(const uint8_t* src_a, |
| const uint8_t* src_b, |
| int count) { |
| uint32_t diff; |
| asm volatile( |
| "movi v4.8h, #0 \n" |
| |
| "1: \n" |
| "ld1 {v0.16b, v1.16b}, [%0], #32 \n" |
| "ld1 {v2.16b, v3.16b}, [%1], #32 \n" |
| "eor v0.16b, v0.16b, v2.16b \n" |
| "prfm pldl1keep, [%0, 448] \n" // prefetch 7 lines ahead |
| "eor v1.16b, v1.16b, v3.16b \n" |
| "cnt v0.16b, v0.16b \n" |
| "prfm pldl1keep, [%1, 448] \n" |
| "cnt v1.16b, v1.16b \n" |
| "subs %w2, %w2, #32 \n" |
| "add v0.16b, v0.16b, v1.16b \n" |
| "uadalp v4.8h, v0.16b \n" |
| "b.gt 1b \n" |
| |
| "uaddlv s4, v4.8h \n" |
| "fmov %w3, s4 \n" |
| : "+r"(src_a), "+r"(src_b), "+r"(count), "=r"(diff) |
| : |
| : "cc", "v0", "v1", "v2", "v3", "v4"); |
| return diff; |
| } |
| |
| uint32_t SumSquareError_NEON(const uint8_t* src_a, |
| const uint8_t* src_b, |
| int count) { |
| uint32_t sse; |
| asm volatile( |
| "eor v16.16b, v16.16b, v16.16b \n" |
| "eor v18.16b, v18.16b, v18.16b \n" |
| "eor v17.16b, v17.16b, v17.16b \n" |
| "eor v19.16b, v19.16b, v19.16b \n" |
| |
| "1: \n" |
| "ld1 {v0.16b}, [%0], #16 \n" |
| "ld1 {v1.16b}, [%1], #16 \n" |
| "subs %w2, %w2, #16 \n" |
| "usubl v2.8h, v0.8b, v1.8b \n" |
| "usubl2 v3.8h, v0.16b, v1.16b \n" |
| "prfm pldl1keep, [%0, 448] \n" // prefetch 7 lines ahead |
| "smlal v16.4s, v2.4h, v2.4h \n" |
| "smlal v17.4s, v3.4h, v3.4h \n" |
| "prfm pldl1keep, [%1, 448] \n" |
| "smlal2 v18.4s, v2.8h, v2.8h \n" |
| "smlal2 v19.4s, v3.8h, v3.8h \n" |
| "b.gt 1b \n" |
| |
| "add v16.4s, v16.4s, v17.4s \n" |
| "add v18.4s, v18.4s, v19.4s \n" |
| "add v19.4s, v16.4s, v18.4s \n" |
| "addv s0, v19.4s \n" |
| "fmov %w3, s0 \n" |
| : "+r"(src_a), "+r"(src_b), "+r"(count), "=r"(sse) |
| : |
| : "cc", "v0", "v1", "v2", "v3", "v16", "v17", "v18", "v19"); |
| return sse; |
| } |
| |
| #endif // !defined(LIBYUV_DISABLE_NEON) && defined(__aarch64__) |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| } // namespace libyuv |
| #endif |
