Update libvpx snapshot to v0.9.7-p1 (Cayuga).

source/libvpx/vp8/encoder/arm/armv6/vp8_sad16x16_armv6.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  |vp8_sad16x16_armv6|
 
     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
 ; stack max_sad (not used)
 |vp8_sad16x16_armv6| 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