2 ; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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.
12 ;EXPORT |vp8_loop_filter_simple_horizontal_edge_neon|
13 EXPORT |vp8_loop_filter_bhs_neon|
14 EXPORT |vp8_loop_filter_mbhs_neon|
18 AREA ||.text||, CODE, READONLY, ALIGN=2
20 ; r0 unsigned char *s, PRESERVE
24 |vp8_loop_filter_simple_horizontal_edge_neon| PROC
26 sub r3, r0, r1, lsl #1 ; move src pointer down by 2 lines
28 vld1.u8 {q7}, [r0@128], r1 ; q0
29 vld1.u8 {q5}, [r3@128], r1 ; p0
30 vld1.u8 {q8}, [r0@128] ; q1
31 vld1.u8 {q6}, [r3@128] ; p1
33 vabd.u8 q15, q6, q7 ; abs(p0 - q0)
34 vabd.u8 q14, q5, q8 ; abs(p1 - q1)
36 vqadd.u8 q15, q15, q15 ; abs(p0 - q0) * 2
37 vshr.u8 q14, q14, #1 ; abs(p1 - q1) / 2
38 vmov.u8 q0, #0x80 ; 0x80
40 vqadd.u8 q15, q15, q14 ; abs(p0 - q0) * 2 + abs(p1 - q1) / 2
42 veor q7, q7, q0 ; qs0: q0 offset to convert to a signed value
43 veor q6, q6, q0 ; ps0: p0 offset to convert to a signed value
44 veor q5, q5, q0 ; ps1: p1 offset to convert to a signed value
45 veor q8, q8, q0 ; qs1: q1 offset to convert to a signed value
47 vcge.u8 q15, q1, q15 ; (abs(p0 - q0)*2 + abs(p1-q1)/2 > limit)*-1
49 vsubl.s8 q2, d14, d12 ; ( qs0 - ps0)
52 vqsub.s8 q4, q5, q8 ; q4: vp8_filter = vp8_signed_char_clamp(ps1-qs1)
54 vmul.s16 q2, q2, q13 ; 3 * ( qs0 - ps0)
57 vmov.u8 q10, #0x03 ; 0x03
58 vmov.u8 q9, #0x04 ; 0x04
60 vaddw.s8 q2, q2, d8 ; vp8_filter + 3 * ( qs0 - ps0)
63 vqmovn.s16 d8, q2 ; vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * ( qs0 - ps0))
66 vand q14, q4, q15 ; vp8_filter &= mask
68 vqadd.s8 q2, q14, q10 ; Filter2 = vp8_signed_char_clamp(vp8_filter+3)
69 vqadd.s8 q3, q14, q9 ; Filter1 = vp8_signed_char_clamp(vp8_filter+4)
70 vshr.s8 q2, q2, #3 ; Filter2 >>= 3
71 vshr.s8 q4, q3, #3 ; Filter1 >>= 3
76 vqadd.s8 q11, q6, q2 ; u = vp8_signed_char_clamp(ps0 + Filter2)
77 vqsub.s8 q10, q7, q4 ; u = vp8_signed_char_clamp(qs0 - Filter1)
79 veor q6, q11, q0 ; *op0 = u^0x80
80 veor q7, q10, q0 ; *oq0 = u^0x80
82 vst1.u8 {q6}, [r3@128] ; store op0
83 vst1.u8 {q7}, [r0@128] ; store oq0
86 ENDP ; |vp8_loop_filter_simple_horizontal_edge_neon|
90 ; r2 const unsigned char *blimit
92 |vp8_loop_filter_bhs_neon| PROC
94 ldrb r3, [r2] ; load blim from mem
95 vdup.s8 q1, r3 ; duplicate blim
97 add r0, r0, r1, lsl #2 ; src = y_ptr + 4 * y_stride
98 bl vp8_loop_filter_simple_horizontal_edge_neon
99 ; vp8_loop_filter_simple_horizontal_edge_neon preserves r0, r1 and q1
100 add r0, r0, r1, lsl #2 ; src = y_ptr + 8* y_stride
101 bl vp8_loop_filter_simple_horizontal_edge_neon
102 add r0, r0, r1, lsl #2 ; src = y_ptr + 12 * y_stride
104 b vp8_loop_filter_simple_horizontal_edge_neon
105 ENDP ;|vp8_loop_filter_bhs_neon|
107 ; r0 unsigned char *y
109 ; r2 const unsigned char *blimit
111 |vp8_loop_filter_mbhs_neon| PROC
112 ldrb r3, [r2] ; load blim from mem
113 vdup.s8 q1, r3 ; duplicate mblim
114 b vp8_loop_filter_simple_horizontal_edge_neon
115 ENDP ;|vp8_loop_filter_bhs_neon|