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comparison: media/libvpx/vp8/encoder/arm/armv6/vp8_mse16x16_armv6.asm
media/libvpx/vp8/encoder/arm/armv6/vp8_mse16x16_armv6.asm
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:ba9bac80a2ac |
|---|---|
| 1 ; | |
| 2 ; Copyright (c) 2011 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_mse16x16_armv6| | |
| 13 | |
| 14 ARM | |
| 15 | |
| 16 AREA ||.text||, CODE, READONLY, ALIGN=2 | |
| 17 | |
| 18 ; r0 unsigned char *src_ptr | |
| 19 ; r1 int source_stride | |
| 20 ; r2 unsigned char *ref_ptr | |
| 21 ; r3 int recon_stride | |
| 22 ; stack unsigned int *sse | |
| 23 ; | |
| 24 ;note: Based on vp8_variance16x16_armv6. In this function, sum is never used. | |
| 25 ; So, we can remove this part of calculation. | |
| 26 | |
| 27 |vp8_mse16x16_armv6| PROC | |
| 28 | |
| 29 push {r4-r9, lr} | |
| 30 | |
| 31 pld [r0, r1, lsl #0] | |
| 32 pld [r2, r3, lsl #0] | |
| 33 | |
| 34 mov r12, #16 ; set loop counter to 16 (=block height) | |
| 35 mov r4, #0 ; initialize sse = 0 | |
| 36 | |
| 37 loop | |
| 38 ; 1st 4 pixels | |
| 39 ldr r5, [r0, #0x0] ; load 4 src pixels | |
| 40 ldr r6, [r2, #0x0] ; load 4 ref pixels | |
| 41 | |
| 42 mov lr, #0 ; constant zero | |
| 43 | |
| 44 usub8 r8, r5, r6 ; calculate difference | |
| 45 pld [r0, r1, lsl #1] | |
| 46 sel r7, r8, lr ; select bytes with positive difference | |
| 47 usub8 r9, r6, r5 ; calculate difference with reversed operands | |
| 48 pld [r2, r3, lsl #1] | |
| 49 sel r8, r9, lr ; select bytes with negative difference | |
| 50 | |
| 51 ; calculate partial sums | |
| 52 usad8 r5, r7, lr ; calculate sum of positive differences | |
| 53 usad8 r6, r8, lr ; calculate sum of negative differences | |
| 54 orr r8, r8, r7 ; differences of all 4 pixels | |
| 55 | |
| 56 ldr r5, [r0, #0x4] ; load 4 src pixels | |
| 57 | |
| 58 ; calculate sse | |
| 59 uxtb16 r6, r8 ; byte (two pixels) to halfwords | |
| 60 uxtb16 r7, r8, ror #8 ; another two pixels to halfwords | |
| 61 smlad r4, r6, r6, r4 ; dual signed multiply, add and accumulate (1) | |
| 62 | |
| 63 ; 2nd 4 pixels | |
| 64 ldr r6, [r2, #0x4] ; load 4 ref pixels | |
| 65 smlad r4, r7, r7, r4 ; dual signed multiply, add and accumulate (2) | |
| 66 | |
| 67 usub8 r8, r5, r6 ; calculate difference | |
| 68 sel r7, r8, lr ; select bytes with positive difference | |
| 69 usub8 r9, r6, r5 ; calculate difference with reversed operands | |
| 70 sel r8, r9, lr ; select bytes with negative difference | |
| 71 | |
| 72 ; calculate partial sums | |
| 73 usad8 r5, r7, lr ; calculate sum of positive differences | |
| 74 usad8 r6, r8, lr ; calculate sum of negative differences | |
| 75 orr r8, r8, r7 ; differences of all 4 pixels | |
| 76 ldr r5, [r0, #0x8] ; load 4 src pixels | |
| 77 ; calculate sse | |
| 78 uxtb16 r6, r8 ; byte (two pixels) to halfwords | |
| 79 uxtb16 r7, r8, ror #8 ; another two pixels to halfwords | |
| 80 smlad r4, r6, r6, r4 ; dual signed multiply, add and accumulate (1) | |
| 81 | |
| 82 ; 3rd 4 pixels | |
| 83 ldr r6, [r2, #0x8] ; load 4 ref pixels | |
| 84 smlad r4, r7, r7, r4 ; dual signed multiply, add and accumulate (2) | |
| 85 | |
| 86 usub8 r8, r5, r6 ; calculate difference | |
| 87 sel r7, r8, lr ; select bytes with positive difference | |
| 88 usub8 r9, r6, r5 ; calculate difference with reversed operands | |
| 89 sel r8, r9, lr ; select bytes with negative difference | |
| 90 | |
| 91 ; calculate partial sums | |
| 92 usad8 r5, r7, lr ; calculate sum of positive differences | |
| 93 usad8 r6, r8, lr ; calculate sum of negative differences | |
| 94 orr r8, r8, r7 ; differences of all 4 pixels | |
| 95 | |
| 96 ldr r5, [r0, #0xc] ; load 4 src pixels | |
| 97 | |
| 98 ; calculate sse | |
| 99 uxtb16 r6, r8 ; byte (two pixels) to halfwords | |
| 100 uxtb16 r7, r8, ror #8 ; another two pixels to halfwords | |
| 101 smlad r4, r6, r6, r4 ; dual signed multiply, add and accumulate (1) | |
| 102 | |
| 103 ; 4th 4 pixels | |
| 104 ldr r6, [r2, #0xc] ; load 4 ref pixels | |
| 105 smlad r4, r7, r7, r4 ; dual signed multiply, add and accumulate (2) | |
| 106 | |
| 107 usub8 r8, r5, r6 ; calculate difference | |
| 108 add r0, r0, r1 ; set src_ptr to next row | |
| 109 sel r7, r8, lr ; select bytes with positive difference | |
| 110 usub8 r9, r6, r5 ; calculate difference with reversed operands | |
| 111 add r2, r2, r3 ; set dst_ptr to next row | |
| 112 sel r8, r9, lr ; select bytes with negative difference | |
| 113 | |
| 114 ; calculate partial sums | |
| 115 usad8 r5, r7, lr ; calculate sum of positive differences | |
| 116 usad8 r6, r8, lr ; calculate sum of negative differences | |
| 117 orr r8, r8, r7 ; differences of all 4 pixels | |
| 118 | |
| 119 subs r12, r12, #1 ; next row | |
| 120 | |
| 121 ; calculate sse | |
| 122 uxtb16 r6, r8 ; byte (two pixels) to halfwords | |
| 123 uxtb16 r7, r8, ror #8 ; another two pixels to halfwords | |
| 124 smlad r4, r6, r6, r4 ; dual signed multiply, add and accumulate (1) | |
| 125 smlad r4, r7, r7, r4 ; dual signed multiply, add and accumulate (2) | |
| 126 | |
| 127 bne loop | |
| 128 | |
| 129 ; return stuff | |
| 130 ldr r1, [sp, #28] ; get address of sse | |
| 131 mov r0, r4 ; return sse | |
| 132 str r4, [r1] ; store sse | |
| 133 | |
| 134 pop {r4-r9, pc} | |
| 135 | |
| 136 ENDP | |
| 137 | |
| 138 END |
