134 lines
5.1 KiB
NASM
134 lines
5.1 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 |vp8_mse16x16_armv6|
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ARM
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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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;
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;note: Based on vp8_variance16x16_armv6. In this function, sum is never used.
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; So, we can remove this part of calculation.
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|vp8_mse16x16_armv6| PROC
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push {r4-r9, lr}
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mov r12, #16 ; set loop counter to 16 (=block height)
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mov r4, #0 ; initialize sse = 0
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loop
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; 1st 4 pixels
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ldr r5, [r0, #0x0] ; load 4 src pixels
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ldr r6, [r2, #0x0] ; load 4 ref pixels
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mov lr, #0 ; constant zero
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usub8 r8, r5, r6 ; calculate difference
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sel r7, r8, lr ; select bytes with positive difference
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usub8 r9, r6, r5 ; calculate difference with reversed operands
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sel r8, r9, lr ; select bytes with negative difference
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; calculate partial sums
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usad8 r5, r7, lr ; calculate sum of positive differences
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usad8 r6, r8, lr ; calculate sum of negative differences
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orr r8, r8, r7 ; differences of all 4 pixels
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ldr r5, [r0, #0x4] ; load 4 src pixels
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; calculate sse
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uxtb16 r6, r8 ; byte (two pixels) to halfwords
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uxtb16 r7, r8, ror #8 ; another two pixels to halfwords
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smlad r4, r6, r6, r4 ; dual signed multiply, add and accumulate (1)
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; 2nd 4 pixels
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ldr r6, [r2, #0x4] ; load 4 ref pixels
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smlad r4, r7, r7, r4 ; dual signed multiply, add and accumulate (2)
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usub8 r8, r5, r6 ; calculate difference
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sel r7, r8, lr ; select bytes with positive difference
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usub8 r9, r6, r5 ; calculate difference with reversed operands
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sel r8, r9, lr ; select bytes with negative difference
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; calculate partial sums
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usad8 r5, r7, lr ; calculate sum of positive differences
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usad8 r6, r8, lr ; calculate sum of negative differences
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orr r8, r8, r7 ; differences of all 4 pixels
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ldr r5, [r0, #0x8] ; load 4 src pixels
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; calculate sse
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uxtb16 r6, r8 ; byte (two pixels) to halfwords
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uxtb16 r7, r8, ror #8 ; another two pixels to halfwords
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smlad r4, r6, r6, r4 ; dual signed multiply, add and accumulate (1)
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; 3rd 4 pixels
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ldr r6, [r2, #0x8] ; load 4 ref pixels
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smlad r4, r7, r7, r4 ; dual signed multiply, add and accumulate (2)
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usub8 r8, r5, r6 ; calculate difference
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sel r7, r8, lr ; select bytes with positive difference
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usub8 r9, r6, r5 ; calculate difference with reversed operands
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sel r8, r9, lr ; select bytes with negative difference
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; calculate partial sums
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usad8 r5, r7, lr ; calculate sum of positive differences
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usad8 r6, r8, lr ; calculate sum of negative differences
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orr r8, r8, r7 ; differences of all 4 pixels
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ldr r5, [r0, #0xc] ; load 4 src pixels
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; calculate sse
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uxtb16 r6, r8 ; byte (two pixels) to halfwords
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uxtb16 r7, r8, ror #8 ; another two pixels to halfwords
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smlad r4, r6, r6, r4 ; dual signed multiply, add and accumulate (1)
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; 4th 4 pixels
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ldr r6, [r2, #0xc] ; load 4 ref pixels
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smlad r4, r7, r7, r4 ; dual signed multiply, add and accumulate (2)
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usub8 r8, r5, r6 ; calculate difference
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add r0, r0, r1 ; set src_ptr to next row
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sel r7, r8, lr ; select bytes with positive difference
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usub8 r9, r6, r5 ; calculate difference with reversed operands
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add r2, r2, r3 ; set dst_ptr to next row
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sel r8, r9, lr ; select bytes with negative difference
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; calculate partial sums
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usad8 r5, r7, lr ; calculate sum of positive differences
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usad8 r6, r8, lr ; calculate sum of negative differences
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orr r8, r8, r7 ; differences of all 4 pixels
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subs r12, r12, #1 ; next row
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; calculate sse
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uxtb16 r6, r8 ; byte (two pixels) to halfwords
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uxtb16 r7, r8, ror #8 ; another two pixels to halfwords
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smlad r4, r6, r6, r4 ; dual signed multiply, add and accumulate (1)
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smlad r4, r7, r7, r4 ; dual signed multiply, add and accumulate (2)
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bne loop
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; return stuff
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ldr r1, [sp, #28] ; get address of sse
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mov r0, r4 ; return sse
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str r4, [r1] ; store sse
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pop {r4-r9, pc}
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ENDP
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END
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