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_loop_filter_simple_horizontal_edge_neon| 13 ARM 14 REQUIRE8 15 PRESERVE8 16 17 AREA ||.text||, CODE, READONLY, ALIGN=2 18 ;Note: flimit, limit, and thresh shpuld be positive numbers. All 16 elements in flimit 19 ;are equal. So, in the code, only one load is needed 20 ;for flimit. Same way applies to limit and thresh. 21 ; r0 unsigned char *s, 22 ; r1 int p, //pitch 23 ; r2 const signed char *flimit, 24 ; r3 const signed char *limit, 25 ; stack(r4) const signed char *thresh, 26 ; //stack(r5) int count --unused 27 28 |vp8_loop_filter_simple_horizontal_edge_neon| PROC 29 sub r0, r0, r1, lsl #1 ; move src pointer down by 2 lines 30 31 ldr r12, _lfhy_coeff_ 32 vld1.u8 {q5}, [r0], r1 ; p1 33 vld1.s8 {d2[], d3[]}, [r2] ; flimit 34 vld1.s8 {d26[], d27[]}, [r3] ; limit -> q13 35 vld1.u8 {q6}, [r0], r1 ; p0 36 vld1.u8 {q0}, [r12]! ; 0x80 37 vld1.u8 {q7}, [r0], r1 ; q0 38 vld1.u8 {q10}, [r12]! ; 0x03 39 vld1.u8 {q8}, [r0] ; q1 40 41 ;vp8_filter_mask() function 42 vabd.u8 q15, q6, q7 ; abs(p0 - q0) 43 vabd.u8 q14, q5, q8 ; abs(p1 - q1) 44 vqadd.u8 q15, q15, q15 ; abs(p0 - q0) * 2 45 vshr.u8 q14, q14, #1 ; abs(p1 - q1) / 2 46 vqadd.u8 q15, q15, q14 ; abs(p0 - q0) * 2 + abs(p1 - q1) / 2 47 48 ;vp8_filter() function 49 veor q7, q7, q0 ; qs0: q0 offset to convert to a signed value 50 veor q6, q6, q0 ; ps0: p0 offset to convert to a signed value 51 veor q5, q5, q0 ; ps1: p1 offset to convert to a signed value 52 veor q8, q8, q0 ; qs1: q1 offset to convert to a signed value 53 54 vadd.u8 q1, q1, q1 ; flimit * 2 55 vadd.u8 q1, q1, q13 ; flimit * 2 + limit 56 vcge.u8 q15, q1, q15 ; (abs(p0 - q0)*2 + abs(p1-q1)/2 > flimit*2 + limit)*-1 57 58 ;;;;;;;;;; 59 ;vqsub.s8 q2, q7, q6 ; ( qs0 - ps0) 60 vsubl.s8 q2, d14, d12 ; ( qs0 - ps0) 61 vsubl.s8 q3, d15, d13 62 63 vqsub.s8 q4, q5, q8 ; q4: vp8_filter = vp8_signed_char_clamp(ps1-qs1) 64 65 ;vmul.i8 q2, q2, q10 ; 3 * ( qs0 - ps0) 66 vadd.s16 q11, q2, q2 ; 3 * ( qs0 - ps0) 67 vadd.s16 q12, q3, q3 68 69 vld1.u8 {q9}, [r12]! ; 0x04 70 71 vadd.s16 q2, q2, q11 72 vadd.s16 q3, q3, q12 73 74 vaddw.s8 q2, q2, d8 ; vp8_filter + 3 * ( qs0 - ps0) 75 vaddw.s8 q3, q3, d9 76 77 ;vqadd.s8 q4, q4, q2 ; vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * ( qs0 - ps0)) 78 vqmovn.s16 d8, q2 ; vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * ( qs0 - ps0)) 79 vqmovn.s16 d9, q3 80 ;;;;;;;;;;;;; 81 82 vand q4, q4, q15 ; vp8_filter &= mask 83 84 vqadd.s8 q2, q4, q10 ; Filter2 = vp8_signed_char_clamp(vp8_filter+3) 85 vqadd.s8 q4, q4, q9 ; Filter1 = vp8_signed_char_clamp(vp8_filter+4) 86 vshr.s8 q2, q2, #3 ; Filter2 >>= 3 87 vshr.s8 q4, q4, #3 ; Filter1 >>= 3 88 89 sub r0, r0, r1, lsl #1 90 91 ;calculate output 92 vqadd.s8 q11, q6, q2 ; u = vp8_signed_char_clamp(ps0 + Filter2) 93 vqsub.s8 q10, q7, q4 ; u = vp8_signed_char_clamp(qs0 - Filter1) 94 95 add r3, r0, r1 96 97 veor q6, q11, q0 ; *op0 = u^0x80 98 veor q7, q10, q0 ; *oq0 = u^0x80 99 100 vst1.u8 {q6}, [r0] ; store op0 101 vst1.u8 {q7}, [r3] ; store oq0 102 103 bx lr 104 ENDP ; |vp8_loop_filter_simple_horizontal_edge_neon| 105 106 ;----------------- 107 AREA hloopfiltery_dat, DATA, READWRITE ;read/write by default 108 ;Data section with name data_area is specified. DCD reserves space in memory for 16 data. 109 ;One word each is reserved. Label filter_coeff can be used to access the data. 110 ;Data address: filter_coeff, filter_coeff+4, filter_coeff+8 ... 111 _lfhy_coeff_ 112 DCD lfhy_coeff 113 lfhy_coeff 114 DCD 0x80808080, 0x80808080, 0x80808080, 0x80808080 115 DCD 0x03030303, 0x03030303, 0x03030303, 0x03030303 116 DCD 0x04040404, 0x04040404, 0x04040404, 0x04040404 117 118 END 119
