| ; |
| ; 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_variance_halfpixvar16x16_hv_media| |
| |
| ARM |
| REQUIRE8 |
| PRESERVE8 |
| |
| AREA ||.text||, CODE, READONLY, ALIGN=2 |
| |
| ; r0 unsigned char *src_ptr |
| ; r1 int source_stride |
| ; r2 unsigned char *ref_ptr |
| ; r3 int recon_stride |
| ; stack unsigned int *sse |
| |vpx_variance_halfpixvar16x16_hv_media| PROC |
| |
| stmfd sp!, {r4-r12, lr} |
| |
| pld [r0, r1, lsl #0] |
| pld [r2, r3, lsl #0] |
| |
| mov r8, #0 ; initialize sum = 0 |
| ldr r10, c80808080 |
| mov r11, #0 ; initialize sse = 0 |
| mov r12, #16 ; set loop counter to 16 (=block height) |
| mov lr, #0 ; constant zero |
| loop |
| add r9, r0, r1 ; pointer to pixels on the next row |
| ; 1st 4 pixels |
| ldr r4, [r0, #0] ; load source pixels a, row N |
| ldr r6, [r0, #1] ; load source pixels b, row N |
| ldr r5, [r9, #0] ; load source pixels c, row N+1 |
| ldr r7, [r9, #1] ; load source pixels d, row N+1 |
| |
| ; x = (a + b + 1) >> 1, interpolate pixels horizontally on row N |
| mvn r6, r6 |
| uhsub8 r4, r4, r6 |
| eor r4, r4, r10 |
| ; y = (c + d + 1) >> 1, interpolate pixels horizontally on row N+1 |
| mvn r7, r7 |
| uhsub8 r5, r5, r7 |
| eor r5, r5, r10 |
| ; z = (x + y + 1) >> 1, interpolate half pixel values vertically |
| mvn r5, r5 |
| uhsub8 r4, r4, r5 |
| ldr r5, [r2, #0] ; load 4 ref pixels |
| eor r4, r4, r10 |
| |
| usub8 r6, r4, r5 ; calculate difference |
| pld [r0, r1, lsl #1] |
| sel r7, r6, lr ; select bytes with positive difference |
| usub8 r6, r5, r4 ; calculate difference with reversed operands |
| pld [r2, r3, lsl #1] |
| sel r6, r6, lr ; select bytes with negative difference |
| |
| ; calculate partial sums |
| usad8 r4, r7, lr ; calculate sum of positive differences |
| usad8 r5, r6, lr ; calculate sum of negative differences |
| orr r6, r6, r7 ; differences of all 4 pixels |
| ; calculate total sum |
| adds r8, r8, r4 ; add positive differences to sum |
| subs r8, r8, r5 ; subtract negative differences from sum |
| |
| ; calculate sse |
| uxtb16 r5, r6 ; byte (two pixels) to halfwords |
| uxtb16 r7, r6, ror #8 ; another two pixels to halfwords |
| smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1) |
| |
| ; 2nd 4 pixels |
| ldr r4, [r0, #4] ; load source pixels a, row N |
| ldr r6, [r0, #5] ; load source pixels b, row N |
| ldr r5, [r9, #4] ; load source pixels c, row N+1 |
| |
| smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2) |
| |
| ldr r7, [r9, #5] ; load source pixels d, row N+1 |
| |
| ; x = (a + b + 1) >> 1, interpolate pixels horizontally on row N |
| mvn r6, r6 |
| uhsub8 r4, r4, r6 |
| eor r4, r4, r10 |
| ; y = (c + d + 1) >> 1, interpolate pixels horizontally on row N+1 |
| mvn r7, r7 |
| uhsub8 r5, r5, r7 |
| eor r5, r5, r10 |
| ; z = (x + y + 1) >> 1, interpolate half pixel values vertically |
| mvn r5, r5 |
| uhsub8 r4, r4, r5 |
| ldr r5, [r2, #4] ; load 4 ref pixels |
| eor r4, r4, r10 |
| |
| usub8 r6, r4, r5 ; calculate difference |
| sel r7, r6, lr ; select bytes with positive difference |
| usub8 r6, r5, r4 ; calculate difference with reversed operands |
| sel r6, r6, lr ; select bytes with negative difference |
| |
| ; calculate partial sums |
| usad8 r4, r7, lr ; calculate sum of positive differences |
| usad8 r5, r6, lr ; calculate sum of negative differences |
| orr r6, r6, r7 ; differences of all 4 pixels |
| |
| ; calculate total sum |
| add r8, r8, r4 ; add positive differences to sum |
| sub r8, r8, r5 ; subtract negative differences from sum |
| |
| ; calculate sse |
| uxtb16 r5, r6 ; byte (two pixels) to halfwords |
| uxtb16 r7, r6, ror #8 ; another two pixels to halfwords |
| smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1) |
| |
| ; 3rd 4 pixels |
| ldr r4, [r0, #8] ; load source pixels a, row N |
| ldr r6, [r0, #9] ; load source pixels b, row N |
| ldr r5, [r9, #8] ; load source pixels c, row N+1 |
| |
| smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2) |
| |
| ldr r7, [r9, #9] ; load source pixels d, row N+1 |
| |
| ; x = (a + b + 1) >> 1, interpolate pixels horizontally on row N |
| mvn r6, r6 |
| uhsub8 r4, r4, r6 |
| eor r4, r4, r10 |
| ; y = (c + d + 1) >> 1, interpolate pixels horizontally on row N+1 |
| mvn r7, r7 |
| uhsub8 r5, r5, r7 |
| eor r5, r5, r10 |
| ; z = (x + y + 1) >> 1, interpolate half pixel values vertically |
| mvn r5, r5 |
| uhsub8 r4, r4, r5 |
| ldr r5, [r2, #8] ; load 4 ref pixels |
| eor r4, r4, r10 |
| |
| usub8 r6, r4, r5 ; calculate difference |
| sel r7, r6, lr ; select bytes with positive difference |
| usub8 r6, r5, r4 ; calculate difference with reversed operands |
| sel r6, r6, lr ; select bytes with negative difference |
| |
| ; calculate partial sums |
| usad8 r4, r7, lr ; calculate sum of positive differences |
| usad8 r5, r6, lr ; calculate sum of negative differences |
| orr r6, r6, r7 ; differences of all 4 pixels |
| |
| ; calculate total sum |
| add r8, r8, r4 ; add positive differences to sum |
| sub r8, r8, r5 ; subtract negative differences from sum |
| |
| ; calculate sse |
| uxtb16 r5, r6 ; byte (two pixels) to halfwords |
| uxtb16 r7, r6, ror #8 ; another two pixels to halfwords |
| smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1) |
| |
| ; 4th 4 pixels |
| ldr r4, [r0, #12] ; load source pixels a, row N |
| ldr r6, [r0, #13] ; load source pixels b, row N |
| ldr r5, [r9, #12] ; load source pixels c, row N+1 |
| smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2) |
| ldr r7, [r9, #13] ; load source pixels d, row N+1 |
| |
| ; x = (a + b + 1) >> 1, interpolate pixels horizontally on row N |
| mvn r6, r6 |
| uhsub8 r4, r4, r6 |
| eor r4, r4, r10 |
| ; y = (c + d + 1) >> 1, interpolate pixels horizontally on row N+1 |
| mvn r7, r7 |
| uhsub8 r5, r5, r7 |
| eor r5, r5, r10 |
| ; z = (x + y + 1) >> 1, interpolate half pixel values vertically |
| mvn r5, r5 |
| uhsub8 r4, r4, r5 |
| ldr r5, [r2, #12] ; load 4 ref pixels |
| eor r4, r4, r10 |
| |
| usub8 r6, r4, r5 ; calculate difference |
| add r0, r0, r1 ; set src_ptr to next row |
| sel r7, r6, lr ; select bytes with positive difference |
| usub8 r6, r5, r4 ; calculate difference with reversed operands |
| add r2, r2, r3 ; set dst_ptr to next row |
| sel r6, r6, lr ; select bytes with negative difference |
| |
| ; calculate partial sums |
| usad8 r4, r7, lr ; calculate sum of positive differences |
| usad8 r5, r6, lr ; calculate sum of negative differences |
| orr r6, r6, r7 ; differences of all 4 pixels |
| |
| ; calculate total sum |
| add r8, r8, r4 ; add positive differences to sum |
| sub r8, r8, r5 ; subtract negative differences from sum |
| |
| ; calculate sse |
| uxtb16 r5, r6 ; byte (two pixels) to halfwords |
| uxtb16 r7, r6, ror #8 ; another two pixels to halfwords |
| smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1) |
| subs r12, r12, #1 |
| smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2) |
| |
| bne loop |
| |
| ; return stuff |
| ldr r6, [sp, #40] ; get address of sse |
| mul r0, r8, r8 ; sum * sum |
| str r11, [r6] ; store sse |
| sub r0, r11, r0, lsr #8 ; return (sse - ((sum * sum) >> 8)) |
| |
| ldmfd sp!, {r4-r12, pc} |
| |
| ENDP |
| |
| c80808080 |
| DCD 0x80808080 |
| |
| END |
