1233d2500723e5594f3e7c70896ffeeef32b9c950ywan; 2233d2500723e5594f3e7c70896ffeeef32b9c950ywan; Copyright (c) 2011 The WebM project authors. All Rights Reserved. 3233d2500723e5594f3e7c70896ffeeef32b9c950ywan; 4233d2500723e5594f3e7c70896ffeeef32b9c950ywan; Use of this source code is governed by a BSD-style license 5233d2500723e5594f3e7c70896ffeeef32b9c950ywan; that can be found in the LICENSE file in the root of the source 6233d2500723e5594f3e7c70896ffeeef32b9c950ywan; tree. An additional intellectual property rights grant can be found 7233d2500723e5594f3e7c70896ffeeef32b9c950ywan; in the file PATENTS. All contributing project authors may 8233d2500723e5594f3e7c70896ffeeef32b9c950ywan; be found in the AUTHORS file in the root of the source tree. 9233d2500723e5594f3e7c70896ffeeef32b9c950ywan; 10233d2500723e5594f3e7c70896ffeeef32b9c950ywan 11233d2500723e5594f3e7c70896ffeeef32b9c950ywan 12233d2500723e5594f3e7c70896ffeeef32b9c950ywan EXPORT |vp8_variance8x8_armv6| 13233d2500723e5594f3e7c70896ffeeef32b9c950ywan 14233d2500723e5594f3e7c70896ffeeef32b9c950ywan ARM 15233d2500723e5594f3e7c70896ffeeef32b9c950ywan 16233d2500723e5594f3e7c70896ffeeef32b9c950ywan AREA ||.text||, CODE, READONLY, ALIGN=2 17233d2500723e5594f3e7c70896ffeeef32b9c950ywan 18233d2500723e5594f3e7c70896ffeeef32b9c950ywan; r0 unsigned char *src_ptr 19233d2500723e5594f3e7c70896ffeeef32b9c950ywan; r1 int source_stride 20233d2500723e5594f3e7c70896ffeeef32b9c950ywan; r2 unsigned char *ref_ptr 21233d2500723e5594f3e7c70896ffeeef32b9c950ywan; r3 int recon_stride 22233d2500723e5594f3e7c70896ffeeef32b9c950ywan; stack unsigned int *sse 23233d2500723e5594f3e7c70896ffeeef32b9c950ywan|vp8_variance8x8_armv6| PROC 24233d2500723e5594f3e7c70896ffeeef32b9c950ywan 25233d2500723e5594f3e7c70896ffeeef32b9c950ywan push {r4-r10, lr} 26233d2500723e5594f3e7c70896ffeeef32b9c950ywan 27233d2500723e5594f3e7c70896ffeeef32b9c950ywan pld [r0, r1, lsl #0] 28233d2500723e5594f3e7c70896ffeeef32b9c950ywan pld [r2, r3, lsl #0] 29233d2500723e5594f3e7c70896ffeeef32b9c950ywan 30233d2500723e5594f3e7c70896ffeeef32b9c950ywan mov r12, #8 ; set loop counter to 8 (=block height) 31233d2500723e5594f3e7c70896ffeeef32b9c950ywan mov r4, #0 ; initialize sum = 0 32233d2500723e5594f3e7c70896ffeeef32b9c950ywan mov r5, #0 ; initialize sse = 0 33233d2500723e5594f3e7c70896ffeeef32b9c950ywan 34233d2500723e5594f3e7c70896ffeeef32b9c950ywanloop 35233d2500723e5594f3e7c70896ffeeef32b9c950ywan ; 1st 4 pixels 36233d2500723e5594f3e7c70896ffeeef32b9c950ywan ldr r6, [r0, #0x0] ; load 4 src pixels 37233d2500723e5594f3e7c70896ffeeef32b9c950ywan ldr r7, [r2, #0x0] ; load 4 ref pixels 38233d2500723e5594f3e7c70896ffeeef32b9c950ywan 39233d2500723e5594f3e7c70896ffeeef32b9c950ywan mov lr, #0 ; constant zero 40233d2500723e5594f3e7c70896ffeeef32b9c950ywan 41233d2500723e5594f3e7c70896ffeeef32b9c950ywan usub8 r8, r6, r7 ; calculate difference 42233d2500723e5594f3e7c70896ffeeef32b9c950ywan pld [r0, r1, lsl #1] 43233d2500723e5594f3e7c70896ffeeef32b9c950ywan sel r10, r8, lr ; select bytes with positive difference 44233d2500723e5594f3e7c70896ffeeef32b9c950ywan usub8 r9, r7, r6 ; calculate difference with reversed operands 45233d2500723e5594f3e7c70896ffeeef32b9c950ywan pld [r2, r3, lsl #1] 46233d2500723e5594f3e7c70896ffeeef32b9c950ywan sel r8, r9, lr ; select bytes with negative difference 47233d2500723e5594f3e7c70896ffeeef32b9c950ywan 48233d2500723e5594f3e7c70896ffeeef32b9c950ywan ; calculate partial sums 49233d2500723e5594f3e7c70896ffeeef32b9c950ywan usad8 r6, r10, lr ; calculate sum of positive differences 50233d2500723e5594f3e7c70896ffeeef32b9c950ywan usad8 r7, r8, lr ; calculate sum of negative differences 51233d2500723e5594f3e7c70896ffeeef32b9c950ywan orr r8, r8, r10 ; differences of all 4 pixels 52233d2500723e5594f3e7c70896ffeeef32b9c950ywan ; calculate total sum 53233d2500723e5594f3e7c70896ffeeef32b9c950ywan add r4, r4, r6 ; add positive differences to sum 54233d2500723e5594f3e7c70896ffeeef32b9c950ywan sub r4, r4, r7 ; subtract negative differences from sum 55233d2500723e5594f3e7c70896ffeeef32b9c950ywan 56233d2500723e5594f3e7c70896ffeeef32b9c950ywan ; calculate sse 57233d2500723e5594f3e7c70896ffeeef32b9c950ywan uxtb16 r7, r8 ; byte (two pixels) to halfwords 58233d2500723e5594f3e7c70896ffeeef32b9c950ywan uxtb16 r10, r8, ror #8 ; another two pixels to halfwords 59233d2500723e5594f3e7c70896ffeeef32b9c950ywan smlad r5, r7, r7, r5 ; dual signed multiply, add and accumulate (1) 60233d2500723e5594f3e7c70896ffeeef32b9c950ywan 61233d2500723e5594f3e7c70896ffeeef32b9c950ywan ; 2nd 4 pixels 62233d2500723e5594f3e7c70896ffeeef32b9c950ywan ldr r6, [r0, #0x4] ; load 4 src pixels 63233d2500723e5594f3e7c70896ffeeef32b9c950ywan ldr r7, [r2, #0x4] ; load 4 ref pixels 64233d2500723e5594f3e7c70896ffeeef32b9c950ywan smlad r5, r10, r10, r5 ; dual signed multiply, add and accumulate (2) 65233d2500723e5594f3e7c70896ffeeef32b9c950ywan 66233d2500723e5594f3e7c70896ffeeef32b9c950ywan usub8 r8, r6, r7 ; calculate difference 67233d2500723e5594f3e7c70896ffeeef32b9c950ywan add r0, r0, r1 ; set src_ptr to next row 68233d2500723e5594f3e7c70896ffeeef32b9c950ywan sel r10, r8, lr ; select bytes with positive difference 69233d2500723e5594f3e7c70896ffeeef32b9c950ywan usub8 r9, r7, r6 ; calculate difference with reversed operands 70233d2500723e5594f3e7c70896ffeeef32b9c950ywan add r2, r2, r3 ; set dst_ptr to next row 71233d2500723e5594f3e7c70896ffeeef32b9c950ywan sel r8, r9, lr ; select bytes with negative difference 72233d2500723e5594f3e7c70896ffeeef32b9c950ywan 73233d2500723e5594f3e7c70896ffeeef32b9c950ywan ; calculate partial sums 74233d2500723e5594f3e7c70896ffeeef32b9c950ywan usad8 r6, r10, lr ; calculate sum of positive differences 75233d2500723e5594f3e7c70896ffeeef32b9c950ywan usad8 r7, r8, lr ; calculate sum of negative differences 76233d2500723e5594f3e7c70896ffeeef32b9c950ywan orr r8, r8, r10 ; differences of all 4 pixels 77233d2500723e5594f3e7c70896ffeeef32b9c950ywan 78233d2500723e5594f3e7c70896ffeeef32b9c950ywan ; calculate total sum 79233d2500723e5594f3e7c70896ffeeef32b9c950ywan add r4, r4, r6 ; add positive differences to sum 80233d2500723e5594f3e7c70896ffeeef32b9c950ywan sub r4, r4, r7 ; subtract negative differences from sum 81233d2500723e5594f3e7c70896ffeeef32b9c950ywan 82233d2500723e5594f3e7c70896ffeeef32b9c950ywan ; calculate sse 83233d2500723e5594f3e7c70896ffeeef32b9c950ywan uxtb16 r7, r8 ; byte (two pixels) to halfwords 84233d2500723e5594f3e7c70896ffeeef32b9c950ywan uxtb16 r10, r8, ror #8 ; another two pixels to halfwords 85233d2500723e5594f3e7c70896ffeeef32b9c950ywan smlad r5, r7, r7, r5 ; dual signed multiply, add and accumulate (1) 86233d2500723e5594f3e7c70896ffeeef32b9c950ywan subs r12, r12, #1 ; next row 87233d2500723e5594f3e7c70896ffeeef32b9c950ywan smlad r5, r10, r10, r5 ; dual signed multiply, add and accumulate (2) 88233d2500723e5594f3e7c70896ffeeef32b9c950ywan 89233d2500723e5594f3e7c70896ffeeef32b9c950ywan bne loop 90233d2500723e5594f3e7c70896ffeeef32b9c950ywan 91233d2500723e5594f3e7c70896ffeeef32b9c950ywan ; return stuff 92233d2500723e5594f3e7c70896ffeeef32b9c950ywan ldr r8, [sp, #32] ; get address of sse 93233d2500723e5594f3e7c70896ffeeef32b9c950ywan mul r1, r4, r4 ; sum * sum 94233d2500723e5594f3e7c70896ffeeef32b9c950ywan str r5, [r8] ; store sse 95233d2500723e5594f3e7c70896ffeeef32b9c950ywan sub r0, r5, r1, ASR #6 ; return (sse - ((sum * sum) >> 6)) 96233d2500723e5594f3e7c70896ffeeef32b9c950ywan 97233d2500723e5594f3e7c70896ffeeef32b9c950ywan pop {r4-r10, pc} 98233d2500723e5594f3e7c70896ffeeef32b9c950ywan 99233d2500723e5594f3e7c70896ffeeef32b9c950ywan ENDP 100233d2500723e5594f3e7c70896ffeeef32b9c950ywan 101233d2500723e5594f3e7c70896ffeeef32b9c950ywan END 102