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_bilinear_predict8x4_neon|
17 AREA ||.text||, CODE, READONLY, ALIGN=2
18 ; r0 unsigned char *src_ptr,
19 ; r1 int src_pixels_per_line,
22 ; r4 unsigned char *dst_ptr,
23 ; stack(lr) int dst_pitch
25 |vp8_bilinear_predict8x4_neon| PROC
28 adr r12, bifilter8x4_coeff
29 ldr r4, [sp, #8] ;load parameters from stack
30 ldr lr, [sp, #12] ;load parameters from stack
32 cmp r2, #0 ;skip first_pass filter if xoffset=0
33 beq skip_firstpass_filter
35 ;First pass: output_height lines x output_width columns (5x8)
36 add r2, r12, r2, lsl #3 ;calculate filter location
38 vld1.u8 {q1}, [r0], r1 ;load src data
39 vld1.u32 {d31}, [r2] ;load first_pass filter
40 vld1.u8 {q2}, [r0], r1
41 vdup.8 d0, d31[0] ;first_pass filter (d0 d1)
42 vld1.u8 {q3}, [r0], r1
44 vld1.u8 {q4}, [r0], r1
46 vmull.u8 q6, d2, d0 ;(src_ptr[0] * vp8_filter[0])
47 vld1.u8 {q5}, [r0], r1
53 vext.8 d3, d2, d3, #1 ;construct src_ptr[-1]
57 vext.8 d11, d10, d11, #1
59 vmlal.u8 q6, d3, d1 ;(src_ptr[1] * vp8_filter[1])
65 vqrshrn.u16 d22, q6, #7 ;shift/round/saturate to u8
66 vqrshrn.u16 d23, q7, #7
67 vqrshrn.u16 d24, q8, #7
68 vqrshrn.u16 d25, q9, #7
69 vqrshrn.u16 d26, q10, #7
73 cmp r3, #0 ;skip second_pass filter if yoffset=0
74 beq skip_secondpass_filter
76 add r3, r12, r3, lsl #3
79 vld1.u32 {d31}, [r3] ;load second_pass filter
82 vdup.8 d0, d31[0] ;second_pass filter parameters (d0 d1)
85 vmull.u8 q1, d22, d0 ;(src_ptr[0] * vp8_filter[0])
90 vmlal.u8 q1, d23, d1 ;(src_ptr[pixel_step] * vp8_filter[1])
97 vqrshrn.u16 d2, q1, #7 ;shift/round/saturate to u8
98 vqrshrn.u16 d3, q2, #7
99 vqrshrn.u16 d4, q3, #7
100 vqrshrn.u16 d5, q4, #7
102 vst1.u8 {d2}, [r4] ;store result
109 ;--------------------
110 skip_firstpass_filter
111 vld1.u8 {d22}, [r0], r1 ;load src data
112 vld1.u8 {d23}, [r0], r1
113 vld1.u8 {d24}, [r0], r1
114 vld1.u8 {d25}, [r0], r1
115 vld1.u8 {d26}, [r0], r1
119 ;---------------------
120 skip_secondpass_filter
121 vst1.u8 {d22}, [r4], lr ;store result
122 vst1.u8 {d23}, [r4], lr
123 vst1.u8 {d24}, [r4], lr
124 vst1.u8 {d25}, [r4], lr
133 DCD 128, 0, 112, 16, 96, 32, 80, 48, 64, 64, 48, 80, 32, 96, 16, 112