ref: 64677c7e996684b7230afe90d598ec14221db2cd
dir: /vpx_dsp/arm/sad_media.asm/
; ; Copyright (c) 2011 The WebM project authors. All Rights Reserved. ; ; Use of this source code is governed by a BSD-style license ; that can be found in the LICENSE file in the root of the source ; tree. An additional intellectual property rights grant can be found ; in the file PATENTS. All contributing project authors may ; be found in the AUTHORS file in the root of the source tree. ; EXPORT |vpx_sad16x16_media| ARM REQUIRE8 PRESERVE8 AREA ||.text||, CODE, READONLY, ALIGN=2 ; r0 const unsigned char *src_ptr ; r1 int src_stride ; r2 const unsigned char *ref_ptr ; r3 int ref_stride |vpx_sad16x16_media| PROC stmfd sp!, {r4-r12, lr} pld [r0, r1, lsl #0] pld [r2, r3, lsl #0] pld [r0, r1, lsl #1] pld [r2, r3, lsl #1] mov r4, #0 ; sad = 0; mov r5, #8 ; loop count loop ; 1st row ldr r6, [r0, #0x0] ; load 4 src pixels (1A) ldr r8, [r2, #0x0] ; load 4 ref pixels (1A) ldr r7, [r0, #0x4] ; load 4 src pixels (1A) ldr r9, [r2, #0x4] ; load 4 ref pixels (1A) ldr r10, [r0, #0x8] ; load 4 src pixels (1B) ldr r11, [r0, #0xC] ; load 4 src pixels (1B) usada8 r4, r8, r6, r4 ; calculate sad for 4 pixels usad8 r8, r7, r9 ; calculate sad for 4 pixels ldr r12, [r2, #0x8] ; load 4 ref pixels (1B) ldr lr, [r2, #0xC] ; load 4 ref pixels (1B) add r0, r0, r1 ; set src pointer to next row add r2, r2, r3 ; set dst pointer to next row pld [r0, r1, lsl #1] pld [r2, r3, lsl #1] usada8 r4, r10, r12, r4 ; calculate sad for 4 pixels usada8 r8, r11, lr, r8 ; calculate sad for 4 pixels ldr r6, [r0, #0x0] ; load 4 src pixels (2A) ldr r7, [r0, #0x4] ; load 4 src pixels (2A) add r4, r4, r8 ; add partial sad values ; 2nd row ldr r8, [r2, #0x0] ; load 4 ref pixels (2A) ldr r9, [r2, #0x4] ; load 4 ref pixels (2A) ldr r10, [r0, #0x8] ; load 4 src pixels (2B) ldr r11, [r0, #0xC] ; load 4 src pixels (2B) usada8 r4, r6, r8, r4 ; calculate sad for 4 pixels usad8 r8, r7, r9 ; calculate sad for 4 pixels ldr r12, [r2, #0x8] ; load 4 ref pixels (2B) ldr lr, [r2, #0xC] ; load 4 ref pixels (2B) add r0, r0, r1 ; set src pointer to next row add r2, r2, r3 ; set dst pointer to next row usada8 r4, r10, r12, r4 ; calculate sad for 4 pixels usada8 r8, r11, lr, r8 ; calculate sad for 4 pixels pld [r0, r1, lsl #1] pld [r2, r3, lsl #1] subs r5, r5, #1 ; decrement loop counter add r4, r4, r8 ; add partial sad values bne loop mov r0, r4 ; return sad ldmfd sp!, {r4-r12, pc} ENDP END