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_sad16x16_armv6| 13 14 ARM 15 REQUIRE8 16 PRESERVE8 17 18 AREA ||.text||, CODE, READONLY, ALIGN=2 19 20 ; r0 const unsigned char *src_ptr 21 ; r1 int src_stride 22 ; r2 const unsigned char *ref_ptr 23 ; r3 int ref_stride 24 ; stack max_sad (not used) 25 |vp8_sad16x16_armv6| PROC 26 stmfd sp!, {r4-r12, lr} 27 28 pld [r0, r1, lsl #0] 29 pld [r2, r3, lsl #0] 30 pld [r0, r1, lsl #1] 31 pld [r2, r3, lsl #1] 32 33 mov r4, #0 ; sad = 0; 34 mov r5, #8 ; loop count 35 36 loop 37 ; 1st row 38 ldr r6, [r0, #0x0] ; load 4 src pixels (1A) 39 ldr r8, [r2, #0x0] ; load 4 ref pixels (1A) 40 ldr r7, [r0, #0x4] ; load 4 src pixels (1A) 41 ldr r9, [r2, #0x4] ; load 4 ref pixels (1A) 42 ldr r10, [r0, #0x8] ; load 4 src pixels (1B) 43 ldr r11, [r0, #0xC] ; load 4 src pixels (1B) 44 45 usada8 r4, r8, r6, r4 ; calculate sad for 4 pixels 46 usad8 r8, r7, r9 ; calculate sad for 4 pixels 47 48 ldr r12, [r2, #0x8] ; load 4 ref pixels (1B) 49 ldr lr, [r2, #0xC] ; load 4 ref pixels (1B) 50 51 add r0, r0, r1 ; set src pointer to next row 52 add r2, r2, r3 ; set dst pointer to next row 53 54 pld [r0, r1, lsl #1] 55 pld [r2, r3, lsl #1] 56 57 usada8 r4, r10, r12, r4 ; calculate sad for 4 pixels 58 usada8 r8, r11, lr, r8 ; calculate sad for 4 pixels 59 60 ldr r6, [r0, #0x0] ; load 4 src pixels (2A) 61 ldr r7, [r0, #0x4] ; load 4 src pixels (2A) 62 add r4, r4, r8 ; add partial sad values 63 64 ; 2nd row 65 ldr r8, [r2, #0x0] ; load 4 ref pixels (2A) 66 ldr r9, [r2, #0x4] ; load 4 ref pixels (2A) 67 ldr r10, [r0, #0x8] ; load 4 src pixels (2B) 68 ldr r11, [r0, #0xC] ; load 4 src pixels (2B) 69 70 usada8 r4, r6, r8, r4 ; calculate sad for 4 pixels 71 usad8 r8, r7, r9 ; calculate sad for 4 pixels 72 73 ldr r12, [r2, #0x8] ; load 4 ref pixels (2B) 74 ldr lr, [r2, #0xC] ; load 4 ref pixels (2B) 75 76 add r0, r0, r1 ; set src pointer to next row 77 add r2, r2, r3 ; set dst pointer to next row 78 79 usada8 r4, r10, r12, r4 ; calculate sad for 4 pixels 80 usada8 r8, r11, lr, r8 ; calculate sad for 4 pixels 81 82 pld [r0, r1, lsl #1] 83 pld [r2, r3, lsl #1] 84 85 subs r5, r5, #1 ; decrement loop counter 86 add r4, r4, r8 ; add partial sad values 87 88 bne loop 89 90 mov r0, r4 ; return sad 91 ldmfd sp!, {r4-r12, pc} 92 93 ENDP 94 95 END 96 97
