chromium / webm / libvpx / 476e8fc8558592f5535ec2bcdfc6798d35f65f12 / . / vpx_dsp / arm / variance_halfpixvar16x16_v_media.asm

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; 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_v_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_v_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 ; set src pointer to next row | |

; 1st 4 pixels | |

ldr r4, [r0, #0] ; load 4 src pixels | |

ldr r6, [r9, #0] ; load 4 src pixels from next row | |

ldr r5, [r2, #0] ; load 4 ref pixels | |

; bilinear interpolation | |

mvn r6, r6 | |

uhsub8 r4, r4, r6 | |

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 4 src pixels | |

ldr r6, [r9, #4] ; load 4 src pixels from next row | |

ldr r5, [r2, #4] ; load 4 ref pixels | |

; bilinear interpolation | |

mvn r6, r6 | |

uhsub8 r4, r4, r6 | |

eor r4, r4, r10 | |

smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2) | |

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 4 src pixels | |

ldr r6, [r9, #8] ; load 4 src pixels from next row | |

ldr r5, [r2, #8] ; load 4 ref pixels | |

; bilinear interpolation | |

mvn r6, r6 | |

uhsub8 r4, r4, r6 | |

eor r4, r4, r10 | |

smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2) | |

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 4 src pixels | |

ldr r6, [r9, #12] ; load 4 src pixels from next row | |

ldr r5, [r2, #12] ; load 4 ref pixels | |

; bilinear interpolation | |

mvn r6, r6 | |

uhsub8 r4, r4, r6 | |

eor r4, r4, r10 | |

smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2) | |

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) | |

smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2) | |

subs r12, r12, #1 | |

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 | |