| /* | |
| * 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(__ARM_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( | |
| "vmov.u16 q4, #0 \n" // accumulator | |
| "1: \n" | |
| "vld1.8 {q0, q1}, [%0]! \n" | |
| "vld1.8 {q2, q3}, [%1]! \n" | |
| "veor.32 q0, q0, q2 \n" | |
| "veor.32 q1, q1, q3 \n" | |
| "vcnt.i8 q0, q0 \n" | |
| "vcnt.i8 q1, q1 \n" | |
| "subs %2, %2, #32 \n" | |
| "vadd.u8 q0, q0, q1 \n" // 16 byte counts | |
| "vpadal.u8 q4, q0 \n" // 8 shorts | |
| "bgt 1b \n" | |
| "vpaddl.u16 q0, q4 \n" // 4 ints | |
| "vpadd.u32 d0, d0, d1 \n" | |
| "vpadd.u32 d0, d0, d0 \n" | |
| "vmov.32 %3, d0[0] \n" | |
| : "+r"(src_a), "+r"(src_b), "+r"(count), "=r"(diff) | |
| : | |
| : "cc", "q0", "q1", "q2", "q3", "q4"); | |
| return diff; | |
| } | |
| uint32_t SumSquareError_NEON(const uint8_t* src_a, | |
| const uint8_t* src_b, | |
| int count) { | |
| uint32_t sse; | |
| asm volatile( | |
| "vmov.u8 q8, #0 \n" | |
| "vmov.u8 q10, #0 \n" | |
| "vmov.u8 q9, #0 \n" | |
| "vmov.u8 q11, #0 \n" | |
| "1: \n" | |
| "vld1.8 {q0}, [%0]! \n" | |
| "vld1.8 {q1}, [%1]! \n" | |
| "subs %2, %2, #16 \n" | |
| "vsubl.u8 q2, d0, d2 \n" | |
| "vsubl.u8 q3, d1, d3 \n" | |
| "vmlal.s16 q8, d4, d4 \n" | |
| "vmlal.s16 q9, d6, d6 \n" | |
| "vmlal.s16 q10, d5, d5 \n" | |
| "vmlal.s16 q11, d7, d7 \n" | |
| "bgt 1b \n" | |
| "vadd.u32 q8, q8, q9 \n" | |
| "vadd.u32 q10, q10, q11 \n" | |
| "vadd.u32 q11, q8, q10 \n" | |
| "vpaddl.u32 q1, q11 \n" | |
| "vadd.u64 d0, d2, d3 \n" | |
| "vmov.32 %3, d0[0] \n" | |
| : "+r"(src_a), "+r"(src_b), "+r"(count), "=r"(sse) | |
| : | |
| : "memory", "cc", "q0", "q1", "q2", "q3", "q8", "q9", "q10", "q11"); | |
| return sse; | |
| } | |
| #endif // defined(__ARM_NEON__) && !defined(__aarch64__) | |
| #ifdef __cplusplus | |
| } // extern "C" | |
| } // namespace libyuv | |
| #endif |