94c52e4da8
When the license headers were updated, they accidentally contained trailing whitespace, so unfortunately we have to touch all the files again. Change-Id: I236c05fade06589e417179c0444cb39b09e4200d
279 lines
8.7 KiB
NASM
279 lines
8.7 KiB
NASM
;
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; Copyright (c) 2010 The VP8 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_sixtap_predict8x4_armv6|
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AREA |.text|, CODE, READONLY ; name this block of code
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;-------------------------------------
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; r0 unsigned char *src_ptr,
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; r1 int src_pixels_per_line,
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; r2 int xoffset,
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; r3 int yoffset,
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; stack unsigned char *dst_ptr,
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; stack int dst_pitch
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;-------------------------------------
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;note: In first pass, store the result in transpose(8linesx9columns) on stack. Temporary stack size is 184.
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;Line width is 20 that is 9 short data plus 2 to make it 4bytes aligned. In second pass, load data from stack,
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;and the result is stored in transpose.
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|vp8_sixtap_predict8x4_armv6| PROC
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stmdb sp!, {r4 - r11, lr}
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sub sp, sp, #184 ;reserve space on stack for temporary storage: 20x(8+1) +4
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cmp r2, #0 ;skip first_pass filter if xoffset=0
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str r3, [sp], #4 ;store yoffset
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beq skip_firstpass_filter
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;first-pass filter
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ldr r12, _filter8_coeff_
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sub r0, r0, r1, lsl #1
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add r2, r12, r2, lsl #4 ;calculate filter location
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add r0, r0, #3 ;adjust src only for loading convinience
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ldr r3, [r2] ; load up packed filter coefficients
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ldr r4, [r2, #4]
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ldr r5, [r2, #8]
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mov r2, #0x90000 ; height=9 is top part of counter
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sub r1, r1, #8
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mov lr, #20
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|first_pass_hloop_v6|
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ldrb r6, [r0, #-5] ; load source data
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ldrb r7, [r0, #-4]
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ldrb r8, [r0, #-3]
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ldrb r9, [r0, #-2]
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ldrb r10, [r0, #-1]
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orr r2, r2, #0x4 ; construct loop counter. width=8=4x2
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pkhbt r6, r6, r7, lsl #16 ; r7 | r6
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pkhbt r7, r7, r8, lsl #16 ; r8 | r7
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pkhbt r8, r8, r9, lsl #16 ; r9 | r8
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pkhbt r9, r9, r10, lsl #16 ; r10 | r9
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|first_pass_wloop_v6|
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smuad r11, r6, r3 ; vp8_filter[0], vp8_filter[1]
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smuad r12, r7, r3
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ldrb r6, [r0], #1
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smlad r11, r8, r4, r11 ; vp8_filter[2], vp8_filter[3]
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ldrb r7, [r0], #1
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smlad r12, r9, r4, r12
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pkhbt r10, r10, r6, lsl #16 ; r10 | r9
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pkhbt r6, r6, r7, lsl #16 ; r11 | r10
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smlad r11, r10, r5, r11 ; vp8_filter[4], vp8_filter[5]
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smlad r12, r6, r5, r12
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sub r2, r2, #1
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add r11, r11, #0x40 ; round_shift_and_clamp
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tst r2, #0xff ; test loop counter
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usat r11, #8, r11, asr #7
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add r12, r12, #0x40
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strh r11, [sp], lr ; result is transposed and stored, which
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usat r12, #8, r12, asr #7
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strh r12, [sp], lr
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movne r11, r6
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movne r12, r7
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movne r6, r8
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movne r7, r9
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movne r8, r10
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movne r9, r11
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movne r10, r12
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bne first_pass_wloop_v6
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;;add r9, ppl, #30 ; attempt to load 2 adjacent cache lines
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;;IF ARCHITECTURE=6
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;pld [src, ppl]
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;;pld [src, r9]
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;;ENDIF
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subs r2, r2, #0x10000
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mov r6, #158
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sub sp, sp, r6
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add r0, r0, r1 ; move to next input line
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bne first_pass_hloop_v6
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;second pass filter
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secondpass_filter
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mov r1, #18
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sub sp, sp, r1 ; 18+4
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ldr r3, [sp, #-4] ; load back yoffset
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ldr r0, [sp, #216] ; load dst address from stack 180+36
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ldr r1, [sp, #220] ; load dst stride from stack 180+40
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cmp r3, #0
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beq skip_secondpass_filter
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ldr r12, _filter8_coeff_
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add lr, r12, r3, lsl #4 ;calculate filter location
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mov r2, #0x00080000
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ldr r3, [lr] ; load up packed filter coefficients
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ldr r4, [lr, #4]
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ldr r5, [lr, #8]
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pkhbt r12, r4, r3 ; pack the filter differently
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pkhbt r11, r5, r4
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second_pass_hloop_v6
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ldr r6, [sp] ; load the data
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ldr r7, [sp, #4]
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orr r2, r2, #2 ; loop counter
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second_pass_wloop_v6
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smuad lr, r3, r6 ; apply filter
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smulbt r10, r3, r6
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ldr r8, [sp, #8]
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smlad lr, r4, r7, lr
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smladx r10, r12, r7, r10
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ldrh r9, [sp, #12]
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smlad lr, r5, r8, lr
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smladx r10, r11, r8, r10
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add sp, sp, #4
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smlatb r10, r5, r9, r10
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sub r2, r2, #1
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add lr, lr, #0x40 ; round_shift_and_clamp
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tst r2, #0xff
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usat lr, #8, lr, asr #7
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add r10, r10, #0x40
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strb lr, [r0], r1 ; the result is transposed back and stored
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usat r10, #8, r10, asr #7
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strb r10, [r0],r1
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movne r6, r7
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movne r7, r8
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bne second_pass_wloop_v6
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subs r2, r2, #0x10000
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add sp, sp, #12 ; updata src for next loop (20-8)
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sub r0, r0, r1, lsl #2
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add r0, r0, #1
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bne second_pass_hloop_v6
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add sp, sp, #20
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ldmia sp!, {r4 - r11, pc}
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;--------------------
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skip_firstpass_filter
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sub r0, r0, r1, lsl #1
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sub r1, r1, #8
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mov r2, #9
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mov r3, #20
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skip_firstpass_hloop
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ldrb r4, [r0], #1 ; load data
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subs r2, r2, #1
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ldrb r5, [r0], #1
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strh r4, [sp], r3 ; store it to immediate buffer
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ldrb r6, [r0], #1 ; load data
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strh r5, [sp], r3
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ldrb r7, [r0], #1
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strh r6, [sp], r3
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ldrb r8, [r0], #1
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strh r7, [sp], r3
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ldrb r9, [r0], #1
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strh r8, [sp], r3
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ldrb r10, [r0], #1
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strh r9, [sp], r3
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ldrb r11, [r0], #1
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strh r10, [sp], r3
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add r0, r0, r1 ; move to next input line
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strh r11, [sp], r3
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mov r4, #158
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sub sp, sp, r4 ; move over to next column
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bne skip_firstpass_hloop
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b secondpass_filter
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;--------------------
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skip_secondpass_filter
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mov r2, #8
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add sp, sp, #4 ;start from src[0] instead of src[-2]
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skip_secondpass_hloop
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ldr r6, [sp], #4
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subs r2, r2, #1
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ldr r8, [sp], #4
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mov r7, r6, lsr #16 ; unpack
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strb r6, [r0], r1
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mov r9, r8, lsr #16
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strb r7, [r0], r1
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add sp, sp, #12 ; 20-8
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strb r8, [r0], r1
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strb r9, [r0], r1
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sub r0, r0, r1, lsl #2
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add r0, r0, #1
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bne skip_secondpass_hloop
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add sp, sp, #16 ; 180 - (160 +4)
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ldmia sp!, {r4 - r11, pc}
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ENDP
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;-----------------
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AREA subpelfilters8_dat, DATA, READWRITE ;read/write by default
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;Data section with name data_area is specified. DCD reserves space in memory for 48 data.
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;One word each is reserved. Label filter_coeff can be used to access the data.
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;Data address: filter_coeff, filter_coeff+4, filter_coeff+8 ...
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_filter8_coeff_
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DCD filter8_coeff
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filter8_coeff
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DCD 0x00000000, 0x00000080, 0x00000000, 0x00000000
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DCD 0xfffa0000, 0x000c007b, 0x0000ffff, 0x00000000
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DCD 0xfff50002, 0x0024006c, 0x0001fff8, 0x00000000
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DCD 0xfff70000, 0x0032005d, 0x0000fffa, 0x00000000
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DCD 0xfff00003, 0x004d004d, 0x0003fff0, 0x00000000
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DCD 0xfffa0000, 0x005d0032, 0x0000fff7, 0x00000000
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DCD 0xfff80001, 0x006c0024, 0x0002fff5, 0x00000000
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DCD 0xffff0000, 0x007b000c, 0x0000fffa, 0x00000000
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;DCD 0, 0, 128, 0, 0, 0
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;DCD 0, -6, 123, 12, -1, 0
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;DCD 2, -11, 108, 36, -8, 1
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;DCD 0, -9, 93, 50, -6, 0
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;DCD 3, -16, 77, 77, -16, 3
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;DCD 0, -6, 50, 93, -9, 0
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;DCD 1, -8, 36, 108, -11, 2
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;DCD 0, -1, 12, 123, -6, 0
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END
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