154 lines
5.8 KiB
NASM
154 lines
5.8 KiB
NASM
;
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; Copyright (c) 2011 The WebM project authors. All Rights Reserved.
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;
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; Use of this source code is governed by a BSD-style license
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; that can be found in the LICENSE file in the root of the source
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; tree. An additional intellectual property rights grant can be found
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; in the file PATENTS. All contributing project authors may
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; be found in the AUTHORS file in the root of the source tree.
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;
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EXPORT |vp9_variance16x16_armv6|
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ARM
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REQUIRE8
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PRESERVE8
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AREA ||.text||, CODE, READONLY, ALIGN=2
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; r0 unsigned char *src_ptr
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; r1 int source_stride
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; r2 unsigned char *ref_ptr
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; r3 int recon_stride
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; stack unsigned int *sse
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|vp9_variance16x16_armv6| PROC
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stmfd sp!, {r4-r12, lr}
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pld [r0, r1, lsl #0]
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pld [r2, r3, lsl #0]
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mov r8, #0 ; initialize sum = 0
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mov r11, #0 ; initialize sse = 0
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mov r12, #16 ; set loop counter to 16 (=block height)
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loop
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; 1st 4 pixels
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ldr r4, [r0, #0] ; load 4 src pixels
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ldr r5, [r2, #0] ; load 4 ref pixels
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mov lr, #0 ; constant zero
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usub8 r6, r4, r5 ; calculate difference
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pld [r0, r1, lsl #1]
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sel r7, r6, lr ; select bytes with positive difference
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usub8 r9, r5, r4 ; calculate difference with reversed operands
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pld [r2, r3, lsl #1]
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sel r6, r9, lr ; select bytes with negative difference
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; calculate partial sums
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usad8 r4, r7, lr ; calculate sum of positive differences
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usad8 r5, r6, lr ; calculate sum of negative differences
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orr r6, r6, r7 ; differences of all 4 pixels
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; calculate total sum
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adds r8, r8, r4 ; add positive differences to sum
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subs r8, r8, r5 ; substract negative differences from sum
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; calculate sse
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uxtb16 r5, r6 ; byte (two pixels) to halfwords
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uxtb16 r10, r6, ror #8 ; another two pixels to halfwords
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smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1)
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; 2nd 4 pixels
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ldr r4, [r0, #4] ; load 4 src pixels
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ldr r5, [r2, #4] ; load 4 ref pixels
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smlad r11, r10, r10, r11 ; dual signed multiply, add and accumulate (2)
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usub8 r6, r4, r5 ; calculate difference
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sel r7, r6, lr ; select bytes with positive difference
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usub8 r9, r5, r4 ; calculate difference with reversed operands
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sel r6, r9, lr ; select bytes with negative difference
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; calculate partial sums
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usad8 r4, r7, lr ; calculate sum of positive differences
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usad8 r5, r6, lr ; calculate sum of negative differences
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orr r6, r6, r7 ; differences of all 4 pixels
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; calculate total sum
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add r8, r8, r4 ; add positive differences to sum
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sub r8, r8, r5 ; substract negative differences from sum
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; calculate sse
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uxtb16 r5, r6 ; byte (two pixels) to halfwords
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uxtb16 r10, r6, ror #8 ; another two pixels to halfwords
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smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1)
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; 3rd 4 pixels
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ldr r4, [r0, #8] ; load 4 src pixels
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ldr r5, [r2, #8] ; load 4 ref pixels
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smlad r11, r10, r10, r11 ; dual signed multiply, add and accumulate (2)
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usub8 r6, r4, r5 ; calculate difference
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sel r7, r6, lr ; select bytes with positive difference
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usub8 r9, r5, r4 ; calculate difference with reversed operands
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sel r6, r9, lr ; select bytes with negative difference
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; calculate partial sums
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usad8 r4, r7, lr ; calculate sum of positive differences
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usad8 r5, r6, lr ; calculate sum of negative differences
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orr r6, r6, r7 ; differences of all 4 pixels
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; calculate total sum
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add r8, r8, r4 ; add positive differences to sum
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sub r8, r8, r5 ; substract negative differences from sum
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; calculate sse
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uxtb16 r5, r6 ; byte (two pixels) to halfwords
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uxtb16 r10, r6, ror #8 ; another two pixels to halfwords
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smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1)
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; 4th 4 pixels
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ldr r4, [r0, #12] ; load 4 src pixels
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ldr r5, [r2, #12] ; load 4 ref pixels
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smlad r11, r10, r10, r11 ; dual signed multiply, add and accumulate (2)
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usub8 r6, r4, r5 ; calculate difference
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add r0, r0, r1 ; set src_ptr to next row
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sel r7, r6, lr ; select bytes with positive difference
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usub8 r9, r5, r4 ; calculate difference with reversed operands
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add r2, r2, r3 ; set dst_ptr to next row
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sel r6, r9, lr ; select bytes with negative difference
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; calculate partial sums
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usad8 r4, r7, lr ; calculate sum of positive differences
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usad8 r5, r6, lr ; calculate sum of negative differences
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orr r6, r6, r7 ; differences of all 4 pixels
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; calculate total sum
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add r8, r8, r4 ; add positive differences to sum
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sub r8, r8, r5 ; substract negative differences from sum
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; calculate sse
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uxtb16 r5, r6 ; byte (two pixels) to halfwords
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uxtb16 r10, r6, ror #8 ; another two pixels to halfwords
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smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1)
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smlad r11, r10, r10, r11 ; dual signed multiply, add and accumulate (2)
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subs r12, r12, #1
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bne loop
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; return stuff
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ldr r6, [sp, #40] ; get address of sse
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mul r0, r8, r8 ; sum * sum
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str r11, [r6] ; store sse
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sub r0, r11, r0, asr #8 ; return (sse - ((sum * sum) >> 8))
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ldmfd sp!, {r4-r12, pc}
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ENDP
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END
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