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_predict4x4_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_predict4x4_neon| PROC 26 push {r4, lr} 27 28 ldr r12, _bifilter4_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 (5x4) 36 vld1.u8 {d2}, [r0], r1 ;load src data 37 add r2, r12, r2, lsl #3 ;calculate Hfilter location (2coeffsx4bytes=8bytes) 38 39 vld1.u8 {d3}, [r0], r1 40 vld1.u32 {d31}, [r2] ;first_pass filter 41 42 vld1.u8 {d4}, [r0], r1 43 vdup.8 d0, d31[0] ;first_pass filter (d0-d1) 44 vld1.u8 {d5}, [r0], r1 45 vdup.8 d1, d31[4] 46 vld1.u8 {d6}, [r0], r1 47 48 vshr.u64 q4, q1, #8 ;construct src_ptr[1] 49 vshr.u64 q5, q2, #8 50 vshr.u64 d12, d6, #8 51 52 vzip.32 d2, d3 ;put 2-line data in 1 register (src_ptr[0]) 53 vzip.32 d4, d5 54 vzip.32 d8, d9 ;put 2-line data in 1 register (src_ptr[1]) 55 vzip.32 d10, d11 56 57 vmull.u8 q7, d2, d0 ;(src_ptr[0] * vp8_filter[0]) 58 vmull.u8 q8, d4, d0 59 vmull.u8 q9, d6, d0 60 61 vmlal.u8 q7, d8, d1 ;(src_ptr[1] * vp8_filter[1]) 62 vmlal.u8 q8, d10, d1 63 vmlal.u8 q9, d12, d1 64 65 vqrshrn.u16 d28, q7, #7 ;shift/round/saturate to u8 66 vqrshrn.u16 d29, q8, #7 67 vqrshrn.u16 d30, q9, #7 68 69;Second pass: 4x4 70secondpass_filter 71 cmp r3, #0 ;skip second_pass filter if yoffset=0 72 beq skip_secondpass_filter 73 74 add r3, r12, r3, lsl #3 ;calculate Vfilter location 75 vld1.u32 {d31}, [r3] ;load second_pass filter 76 77 vdup.8 d0, d31[0] ;second_pass filter parameters (d0-d5) 78 vdup.8 d1, d31[4] 79 80 vmull.u8 q1, d28, d0 81 vmull.u8 q2, d29, d0 82 83 vext.8 d26, d28, d29, #4 ;construct src_ptr[pixel_step] 84 vext.8 d27, d29, d30, #4 85 86 vmlal.u8 q1, d26, d1 87 vmlal.u8 q2, d27, d1 88 89 add r0, r4, lr 90 add r1, r0, lr 91 add r2, r1, lr 92 93 vqrshrn.u16 d2, q1, #7 ;shift/round/saturate to u8 94 vqrshrn.u16 d3, q2, #7 95 96 vst1.32 {d2[0]}, [r4] ;store result 97 vst1.32 {d2[1]}, [r0] 98 vst1.32 {d3[0]}, [r1] 99 vst1.32 {d3[1]}, [r2] 100 101 pop {r4, pc} 102 103;-------------------- 104skip_firstpass_filter 105 106 vld1.32 {d28[0]}, [r0], r1 ;load src data 107 vld1.32 {d28[1]}, [r0], r1 108 vld1.32 {d29[0]}, [r0], r1 109 vld1.32 {d29[1]}, [r0], r1 110 vld1.32 {d30[0]}, [r0], r1 111 112 b secondpass_filter 113 114;--------------------- 115skip_secondpass_filter 116 vst1.32 {d28[0]}, [r4], lr ;store result 117 vst1.32 {d28[1]}, [r4], lr 118 vst1.32 {d29[0]}, [r4], lr 119 vst1.32 {d29[1]}, [r4], lr 120 121 pop {r4, pc} 122 123 ENDP 124 125;----------------- 126 127_bifilter4_coeff_ 128 DCD bifilter4_coeff 129bifilter4_coeff 130 DCD 128, 0, 112, 16, 96, 32, 80, 48, 64, 64, 48, 80, 32, 96, 16, 112 131 132 END 133