97 lines
3.0 KiB
NASM
97 lines
3.0 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_sad16x16_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 const unsigned char *src_ptr
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; r1 int src_stride
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; r2 const unsigned char *ref_ptr
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; r3 int ref_stride
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; stack max_sad (not used)
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|vp8_sad16x16_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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pld [r0, r1, lsl #1]
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pld [r2, r3, lsl #1]
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mov r4, #0 ; sad = 0;
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mov r5, #8 ; loop count
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loop
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; 1st row
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ldr r6, [r0, #0x0] ; load 4 src pixels (1A)
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ldr r8, [r2, #0x0] ; load 4 ref pixels (1A)
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ldr r7, [r0, #0x4] ; load 4 src pixels (1A)
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ldr r9, [r2, #0x4] ; load 4 ref pixels (1A)
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ldr r10, [r0, #0x8] ; load 4 src pixels (1B)
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ldr r11, [r0, #0xC] ; load 4 src pixels (1B)
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usada8 r4, r8, r6, r4 ; calculate sad for 4 pixels
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usad8 r8, r7, r9 ; calculate sad for 4 pixels
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ldr r12, [r2, #0x8] ; load 4 ref pixels (1B)
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ldr lr, [r2, #0xC] ; load 4 ref pixels (1B)
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add r0, r0, r1 ; set src pointer to next row
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add r2, r2, r3 ; set dst pointer to next row
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pld [r0, r1, lsl #1]
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pld [r2, r3, lsl #1]
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usada8 r4, r10, r12, r4 ; calculate sad for 4 pixels
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usada8 r8, r11, lr, r8 ; calculate sad for 4 pixels
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ldr r6, [r0, #0x0] ; load 4 src pixels (2A)
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ldr r7, [r0, #0x4] ; load 4 src pixels (2A)
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add r4, r4, r8 ; add partial sad values
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; 2nd row
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ldr r8, [r2, #0x0] ; load 4 ref pixels (2A)
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ldr r9, [r2, #0x4] ; load 4 ref pixels (2A)
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ldr r10, [r0, #0x8] ; load 4 src pixels (2B)
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ldr r11, [r0, #0xC] ; load 4 src pixels (2B)
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usada8 r4, r6, r8, r4 ; calculate sad for 4 pixels
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usad8 r8, r7, r9 ; calculate sad for 4 pixels
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ldr r12, [r2, #0x8] ; load 4 ref pixels (2B)
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ldr lr, [r2, #0xC] ; load 4 ref pixels (2B)
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add r0, r0, r1 ; set src pointer to next row
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add r2, r2, r3 ; set dst pointer to next row
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usada8 r4, r10, r12, r4 ; calculate sad for 4 pixels
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usada8 r8, r11, lr, r8 ; calculate sad for 4 pixels
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pld [r0, r1, lsl #1]
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pld [r2, r3, lsl #1]
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subs r5, r5, #1 ; decrement loop counter
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add r4, r4, r8 ; add partial sad values
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bne loop
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mov r0, r4 ; return sad
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ldmfd sp!, {r4-r12, pc}
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ENDP
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END
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