vp8/common/arm/armv6/copymem16x16_v6.asm

   1 ;
   2 ;  Copyright (c) 2010 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_copy_mem16x16_v6|
  13     ; ARM
  14     ; REQUIRE8
  15     ; PRESERVE8
  16
  17     AREA    Block, CODE, READONLY ; name this block of code
  18 ;void copy_mem16x16_v6( unsigned char *src, int src_stride, unsigned char *dst, int dst_stride)
  19 ;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  20 |vp8_copy_mem16x16_v6| PROC
  21     stmdb       sp!, {r4 - r7}
  22     ;push   {r4-r7}
  23
  24     ;preload
  25     pld     [r0, #31]                ; preload for next 16x16 block
  26
  27     ands    r4, r0, #15
  28     beq     copy_mem16x16_fast
  29
  30     ands    r4, r0, #7
  31     beq     copy_mem16x16_8
  32
  33     ands    r4, r0, #3
  34     beq     copy_mem16x16_4
  35
  36     ;copy one byte each time
  37     ldrb    r4, [r0]
  38     ldrb    r5, [r0, #1]
  39     ldrb    r6, [r0, #2]
  40     ldrb    r7, [r0, #3]
  41
  42     mov     r12, #16
  43
  44 copy_mem16x16_1_loop
  45     strb    r4, [r2]
  46     strb    r5, [r2, #1]
  47     strb    r6, [r2, #2]
  48     strb    r7, [r2, #3]
  49
  50     ldrb    r4, [r0, #4]
  51     ldrb    r5, [r0, #5]
  52     ldrb    r6, [r0, #6]
  53     ldrb    r7, [r0, #7]
  54
  55     subs    r12, r12, #1
  56
  57     strb    r4, [r2, #4]
  58     strb    r5, [r2, #5]
  59     strb    r6, [r2, #6]
  60     strb    r7, [r2, #7]
  61
  62     ldrb    r4, [r0, #8]
  63     ldrb    r5, [r0, #9]
  64     ldrb    r6, [r0, #10]
  65     ldrb    r7, [r0, #11]
  66
  67     strb    r4, [r2, #8]
  68     strb    r5, [r2, #9]
  69     strb    r6, [r2, #10]
  70     strb    r7, [r2, #11]
  71
  72     ldrb    r4, [r0, #12]
  73     ldrb    r5, [r0, #13]
  74     ldrb    r6, [r0, #14]
  75     ldrb    r7, [r0, #15]
  76
  77     add     r0, r0, r1
  78
  79     strb    r4, [r2, #12]
  80     strb    r5, [r2, #13]
  81     strb    r6, [r2, #14]
  82     strb    r7, [r2, #15]
  83
  84     add     r2, r2, r3
  85
  86     ldrneb  r4, [r0]
  87     ldrneb  r5, [r0, #1]
  88     ldrneb  r6, [r0, #2]
  89     ldrneb  r7, [r0, #3]
  90
  91     pld     [r0, #31]               ; preload for next 16x16 block
  92
  93     bne     copy_mem16x16_1_loop
  94
  95     ldmia       sp!, {r4 - r7}
  96     ;pop        {r4-r7}
  97     mov     pc, lr
  98
  99 ;copy 4 bytes each time
 100 copy_mem16x16_4
 101     ldr     r4, [r0]
 102     ldr     r5, [r0, #4]
 103     ldr     r6, [r0, #8]
 104     ldr     r7, [r0, #12]
 105
 106     mov     r12, #16
 107
 108 copy_mem16x16_4_loop
 109     subs    r12, r12, #1
 110     add     r0, r0, r1
 111
 112     str     r4, [r2]
 113     str     r5, [r2, #4]
 114     str     r6, [r2, #8]
 115     str     r7, [r2, #12]
 116
 117     add     r2, r2, r3
 118
 119     ldrne   r4, [r0]
 120     ldrne   r5, [r0, #4]
 121     ldrne   r6, [r0, #8]
 122     ldrne   r7, [r0, #12]
 123
 124     pld     [r0, #31]               ; preload for next 16x16 block
 125
 126     bne     copy_mem16x16_4_loop
 127
 128     ldmia       sp!, {r4 - r7}
 129     ;pop        {r4-r7}
 130     mov     pc, lr
 131
 132 ;copy 8 bytes each time
 133 copy_mem16x16_8
 134     sub     r1, r1, #16
 135     sub     r3, r3, #16
 136
 137     mov     r12, #16
 138
 139 copy_mem16x16_8_loop
 140     ldmia   r0!, {r4-r5}
 141     ;ldm        r0, {r4-r5}
 142     ldmia   r0!, {r6-r7}
 143
 144     add     r0, r0, r1
 145
 146     stmia   r2!, {r4-r5}
 147     subs    r12, r12, #1
 148     ;stm        r2, {r4-r5}
 149     stmia   r2!, {r6-r7}
 150
 151     add     r2, r2, r3
 152
 153     pld     [r0, #31]               ; preload for next 16x16 block
 154     bne     copy_mem16x16_8_loop
 155
 156     ldmia       sp!, {r4 - r7}
 157     ;pop        {r4-r7}
 158     mov     pc, lr
 159
 160 ;copy 16 bytes each time
 161 copy_mem16x16_fast
 162     ;sub        r1, r1, #16
 163     ;sub        r3, r3, #16
 164
 165     mov     r12, #16
 166
 167 copy_mem16x16_fast_loop
 168     ldmia   r0, {r4-r7}
 169     ;ldm        r0, {r4-r7}
 170     add     r0, r0, r1
 171
 172     subs    r12, r12, #1
 173     stmia   r2, {r4-r7}
 174     ;stm        r2, {r4-r7}
 175     add     r2, r2, r3
 176
 177     pld     [r0, #31]               ; preload for next 16x16 block
 178     bne     copy_mem16x16_fast_loop
 179
 180     ldmia       sp!, {r4 - r7}
 181     ;pop        {r4-r7}
 182     mov     pc, lr
 183
 184     ENDP  ; |vp8_copy_mem16x16_v6|
 185
 186     END