1 /*
2 * Copyright 2012 The LibYuv Project Authors. All rights reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "libyuv/basic_types.h"
12
13 #ifdef __cplusplus
14 namespace libyuv {
15 extern "C" {
16 #endif
17
18 #if !defined(YUV_DISABLE_ASM) && defined(__ARM_NEON__)
19
SumSquareError_NEON(const uint8 * src_a,const uint8 * src_b,int count)20 uint32 SumSquareError_NEON(const uint8* src_a, const uint8* src_b, int count) {
21 volatile uint32 sse;
22 asm volatile (
23 "vmov.u8 q8, #0 \n"
24 "vmov.u8 q10, #0 \n"
25 "vmov.u8 q9, #0 \n"
26 "vmov.u8 q11, #0 \n"
27
28 ".p2align 2 \n"
29 "1: \n"
30 "vld1.u8 {q0}, [%0]! \n"
31 "vld1.u8 {q1}, [%1]! \n"
32 "subs %2, %2, #16 \n"
33 "vsubl.u8 q2, d0, d2 \n"
34 "vsubl.u8 q3, d1, d3 \n"
35 "vmlal.s16 q8, d4, d4 \n"
36 "vmlal.s16 q9, d6, d6 \n"
37 "vmlal.s16 q10, d5, d5 \n"
38 "vmlal.s16 q11, d7, d7 \n"
39 "bgt 1b \n"
40
41 "vadd.u32 q8, q8, q9 \n"
42 "vadd.u32 q10, q10, q11 \n"
43 "vadd.u32 q11, q8, q10 \n"
44 "vpaddl.u32 q1, q11 \n"
45 "vadd.u64 d0, d2, d3 \n"
46 "vmov.32 %3, d0[0] \n"
47 : "+r"(src_a),
48 "+r"(src_b),
49 "+r"(count),
50 "=r"(sse)
51 :
52 : "memory", "cc", "q0", "q1", "q2", "q3", "q8", "q9", "q10", "q11");
53 return sse;
54 }
55
56 #endif // __ARM_NEON__
57
58 #ifdef __cplusplus
59 } // extern "C"
60 } // namespace libyuv
61 #endif
62
63