1 ; 2 ; Copyright (c) 2010 The WebM 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 12 EXPORT |vp8_bilinear_predict8x4_neon| 13 ARM 14 REQUIRE8 15 PRESERVE8 16 17 AREA ||.text||, CODE, READONLY, ALIGN=2 18 ; r0 unsigned char *src_ptr, 19 ; r1 int src_pixels_per_line, 20 ; r2 int xoffset, 21 ; r3 int yoffset, 22 ; r4 unsigned char *dst_ptr, 23 ; stack(lr) int dst_pitch 24 25 |vp8_bilinear_predict8x4_neon| PROC 26 push {r4, lr} 27 28 ldr r12, _bifilter8x4_coeff_ 29 ldr r4, [sp, #8] ;load parameters from stack 30 ldr lr, [sp, #12] ;load parameters from stack 31 32 cmp r2, #0 ;skip first_pass filter if xoffset=0 33 beq skip_firstpass_filter 34 35 ;First pass: output_height lines x output_width columns (5x8) 36 add r2, r12, r2, lsl #3 ;calculate filter location 37 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 43 vdup.8 d1, d31[4] 44 vld1.u8 {q4}, [r0], r1 45 46 vmull.u8 q6, d2, d0 ;(src_ptr[0] * vp8_filter[0]) 47 vld1.u8 {q5}, [r0], r1 48 vmull.u8 q7, d4, d0 49 vmull.u8 q8, d6, d0 50 vmull.u8 q9, d8, d0 51 vmull.u8 q10, d10, d0 52 53 vext.8 d3, d2, d3, #1 ;construct src_ptr[-1] 54 vext.8 d5, d4, d5, #1 55 vext.8 d7, d6, d7, #1 56 vext.8 d9, d8, d9, #1 57 vext.8 d11, d10, d11, #1 58 59 vmlal.u8 q6, d3, d1 ;(src_ptr[1] * vp8_filter[1]) 60 vmlal.u8 q7, d5, d1 61 vmlal.u8 q8, d7, d1 62 vmlal.u8 q9, d9, d1 63 vmlal.u8 q10, d11, d1 64 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 70 71 ;Second pass: 4x8 72 secondpass_filter 73 cmp r3, #0 ;skip second_pass filter if yoffset=0 74 beq skip_secondpass_filter 75 76 add r3, r12, r3, lsl #3 77 add r0, r4, lr 78 79 vld1.u32 {d31}, [r3] ;load second_pass filter 80 add r1, r0, lr 81 82 vdup.8 d0, d31[0] ;second_pass filter parameters (d0 d1) 83 vdup.8 d1, d31[4] 84 85 vmull.u8 q1, d22, d0 ;(src_ptr[0] * vp8_filter[0]) 86 vmull.u8 q2, d23, d0 87 vmull.u8 q3, d24, d0 88 vmull.u8 q4, d25, d0 89 90 vmlal.u8 q1, d23, d1 ;(src_ptr[pixel_step] * vp8_filter[1]) 91 vmlal.u8 q2, d24, d1 92 vmlal.u8 q3, d25, d1 93 vmlal.u8 q4, d26, d1 94 95 add r2, r1, lr 96 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, #7 101 102 vst1.u8 {d2}, [r4] ;store result 103 vst1.u8 {d3}, [r0] 104 vst1.u8 {d4}, [r1] 105 vst1.u8 {d5}, [r2] 106 107 pop {r4, pc} 108 109 ;-------------------- 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 116 117 b secondpass_filter 118 119 ;--------------------- 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 125 126 pop {r4, pc} 127 128 ENDP 129 130 ;----------------- 131 AREA bifilters8x4_dat, DATA, READWRITE ;read/write by default 132 ;Data section with name data_area is specified. DCD reserves space in memory for 48 data. 133 ;One word each is reserved. Label filter_coeff can be used to access the data. 134 ;Data address: filter_coeff, filter_coeff+4, filter_coeff+8 ... 135 _bifilter8x4_coeff_ 136 DCD bifilter8x4_coeff 137 bifilter8x4_coeff 138 DCD 128, 0, 112, 16, 96, 32, 80, 48, 64, 64, 48, 80, 32, 96, 16, 112 139 140 END 141
