ref: d4797aa8fd200413b61af63006fac847b3e0ca02
dir: /vp8/common/arm/armv6/filter_v6.asm/
; ; Copyright (c) 2010 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 |vp8_filter_block2d_first_pass_armv6| EXPORT |vp8_filter_block2d_second_pass_armv6| EXPORT |vp8_filter4_block2d_second_pass_armv6| EXPORT |vp8_filter_block2d_first_pass_only_armv6| EXPORT |vp8_filter_block2d_second_pass_only_armv6| AREA |.text|, CODE, READONLY ; name this block of code ;------------------------------------- ; r0 unsigned char *src_ptr ; r1 short *output_ptr ; r2 unsigned int src_pixels_per_line ; r3 unsigned int output_width ; stack unsigned int output_height ; stack const short *vp8_filter ;------------------------------------- ; vp8_filter the input and put in the output array. Apply the 6 tap FIR filter with ; the output being a 2 byte value and the intput being a 1 byte value. |vp8_filter_block2d_first_pass_armv6| PROC stmdb sp!, {r4 - r11, lr} ldr r11, [sp, #40] ; vp8_filter address ldr r7, [sp, #36] ; output height sub r2, r2, r3 ; inside loop increments input array, ; so the height loop only needs to add ; r2 - width to the input pointer mov r3, r3, lsl #1 ; multiply width by 2 because using shorts add r12, r3, #16 ; square off the output sub sp, sp, #4 ;;IF ARCHITECTURE=6 ;pld [r0, #-2] ;;pld [r0, #30] ;;ENDIF ldr r4, [r11] ; load up packed filter coefficients ldr r5, [r11, #4] ldr r6, [r11, #8] str r1, [sp] ; push destination to stack mov r7, r7, lsl #16 ; height is top part of counter ; six tap filter |height_loop_1st_6| ldrb r8, [r0, #-2] ; load source data ldrb r9, [r0, #-1] ldrb r10, [r0], #2 orr r7, r7, r3, lsr #2 ; construct loop counter |width_loop_1st_6| ldrb r11, [r0, #-1] pkhbt lr, r8, r9, lsl #16 ; r9 | r8 pkhbt r8, r9, r10, lsl #16 ; r10 | r9 ldrb r9, [r0] smuad lr, lr, r4 ; apply the filter pkhbt r10, r10, r11, lsl #16 ; r11 | r10 smuad r8, r8, r4 pkhbt r11, r11, r9, lsl #16 ; r9 | r11 smlad lr, r10, r5, lr ldrb r10, [r0, #1] smlad r8, r11, r5, r8 ldrb r11, [r0, #2] sub r7, r7, #1 pkhbt r9, r9, r10, lsl #16 ; r10 | r9 pkhbt r10, r10, r11, lsl #16 ; r11 | r10 smlad lr, r9, r6, lr smlad r11, r10, r6, r8 ands r10, r7, #0xff ; test loop counter add lr, lr, #0x40 ; round_shift_and_clamp ldrneb r8, [r0, #-2] ; load data for next loop usat lr, #8, lr, asr #7 add r11, r11, #0x40 ldrneb r9, [r0, #-1] usat r11, #8, r11, asr #7 strh lr, [r1], r12 ; result is transposed and stored, which ; will make second pass filtering easier. ldrneb r10, [r0], #2 strh r11, [r1], r12 bne width_loop_1st_6 ;;add r9, r2, #30 ; attempt to load 2 adjacent cache lines ;;IF ARCHITECTURE=6 ;pld [r0, r2] ;;pld [r0, r9] ;;ENDIF ldr r1, [sp] ; load and update dst address subs r7, r7, #0x10000 add r0, r0, r2 ; move to next input line add r1, r1, #2 ; move over to next column str r1, [sp] bne height_loop_1st_6 add sp, sp, #4 ldmia sp!, {r4 - r11, pc} ENDP ;--------------------------------- ; r0 short *src_ptr, ; r1 unsigned char *output_ptr, ; r2 unsigned int output_pitch, ; r3 unsigned int cnt, ; stack const short *vp8_filter ;--------------------------------- |vp8_filter_block2d_second_pass_armv6| PROC stmdb sp!, {r4 - r11, lr} ldr r11, [sp, #36] ; vp8_filter address sub sp, sp, #4 mov r7, r3, lsl #16 ; height is top part of counter str r1, [sp] ; push destination to stack ldr r4, [r11] ; load up packed filter coefficients ldr r5, [r11, #4] ldr r6, [r11, #8] pkhbt r12, r5, r4 ; pack the filter differently pkhbt r11, r6, r5 sub r0, r0, #4 ; offset input buffer |height_loop_2nd| ldr r8, [r0] ; load the data ldr r9, [r0, #4] orr r7, r7, r3, lsr #1 ; loop counter |width_loop_2nd| smuad lr, r4, r8 ; apply filter sub r7, r7, #1 smulbt r8, r4, r8 ldr r10, [r0, #8] smlad lr, r5, r9, lr smladx r8, r12, r9, r8 ldrh r9, [r0, #12] smlad lr, r6, r10, lr smladx r8, r11, r10, r8 add r0, r0, #4 smlatb r10, r6, r9, r8 add lr, lr, #0x40 ; round_shift_and_clamp ands r8, r7, #0xff usat lr, #8, lr, asr #7 add r10, r10, #0x40 strb lr, [r1], r2 ; the result is transposed back and stored usat r10, #8, r10, asr #7 ldrne r8, [r0] ; load data for next loop ldrne r9, [r0, #4] strb r10, [r1], r2 bne width_loop_2nd ldr r1, [sp] ; update dst for next loop subs r7, r7, #0x10000 add r0, r0, #16 ; updata src for next loop add r1, r1, #1 str r1, [sp] bne height_loop_2nd add sp, sp, #4 ldmia sp!, {r4 - r11, pc} ENDP ;--------------------------------- ; r0 short *src_ptr, ; r1 unsigned char *output_ptr, ; r2 unsigned int output_pitch, ; r3 unsigned int cnt, ; stack const short *vp8_filter ;--------------------------------- |vp8_filter4_block2d_second_pass_armv6| PROC stmdb sp!, {r4 - r11, lr} ldr r11, [sp, #36] ; vp8_filter address mov r7, r3, lsl #16 ; height is top part of counter ldr r4, [r11] ; load up packed filter coefficients add lr, r1, r3 ; save final destination pointer ldr r5, [r11, #4] ldr r6, [r11, #8] pkhbt r12, r5, r4 ; pack the filter differently pkhbt r11, r6, r5 mov r4, #0x40 ; rounding factor (for smlad{x}) |height_loop_2nd_4| ldrd r8, [r0, #-4] ; load the data orr r7, r7, r3, lsr #1 ; loop counter |width_loop_2nd_4| ldr r10, [r0, #4]! smladx r6, r9, r12, r4 ; apply filter pkhbt r8, r9, r8 smlad r5, r8, r12, r4 pkhbt r8, r10, r9 smladx r6, r10, r11, r6 sub r7, r7, #1 smlad r5, r8, r11, r5 mov r8, r9 ; shift the data for the next loop mov r9, r10 usat r6, #8, r6, asr #7 ; shift and clamp usat r5, #8, r5, asr #7 strb r5, [r1], r2 ; the result is transposed back and stored tst r7, #0xff strb r6, [r1], r2 bne width_loop_2nd_4 subs r7, r7, #0x10000 add r0, r0, #16 ; update src for next loop sub r1, lr, r7, lsr #16 ; update dst for next loop bne height_loop_2nd_4 ldmia sp!, {r4 - r11, pc} ENDP ;------------------------------------ ; r0 unsigned char *src_ptr ; r1 unsigned char *output_ptr, ; r2 unsigned int src_pixels_per_line ; r3 unsigned int cnt, ; stack unsigned int output_pitch, ; stack const short *vp8_filter ;------------------------------------ |vp8_filter_block2d_first_pass_only_armv6| PROC stmdb sp!, {r4 - r11, lr} ldr r4, [sp, #36] ; output pitch ldr r11, [sp, #40] ; HFilter address sub sp, sp, #8 mov r7, r3 sub r2, r2, r3 ; inside loop increments input array, ; so the height loop only needs to add ; r2 - width to the input pointer sub r4, r4, r3 str r4, [sp] ; save modified output pitch str r2, [sp, #4] mov r2, #0x40 ldr r4, [r11] ; load up packed filter coefficients ldr r5, [r11, #4] ldr r6, [r11, #8] ; six tap filter |height_loop_1st_only_6| ldrb r8, [r0, #-2] ; load data ldrb r9, [r0, #-1] ldrb r10, [r0], #2 mov r12, r3, lsr #1 ; loop counter |width_loop_1st_only_6| ldrb r11, [r0, #-1] pkhbt lr, r8, r9, lsl #16 ; r9 | r8 pkhbt r8, r9, r10, lsl #16 ; r10 | r9 ldrb r9, [r0] ;; smuad lr, lr, r4 smlad lr, lr, r4, r2 pkhbt r10, r10, r11, lsl #16 ; r11 | r10 ;; smuad r8, r8, r4 smlad r8, r8, r4, r2 pkhbt r11, r11, r9, lsl #16 ; r9 | r11 smlad lr, r10, r5, lr ldrb r10, [r0, #1] smlad r8, r11, r5, r8 ldrb r11, [r0, #2] subs r12, r12, #1 pkhbt r9, r9, r10, lsl #16 ; r10 | r9 pkhbt r10, r10, r11, lsl #16 ; r11 | r10 smlad lr, r9, r6, lr smlad r10, r10, r6, r8 ;; add lr, lr, #0x40 ; round_shift_and_clamp ldrneb r8, [r0, #-2] ; load data for next loop usat lr, #8, lr, asr #7 ;; add r10, r10, #0x40 strb lr, [r1], #1 ; store the result usat r10, #8, r10, asr #7 ldrneb r9, [r0, #-1] strb r10, [r1], #1 ldrneb r10, [r0], #2 bne width_loop_1st_only_6 ;;add r9, r2, #30 ; attempt to load 2 adjacent cache lines ;;IF ARCHITECTURE=6 ;pld [r0, r2] ;;pld [r0, r9] ;;ENDIF ldr lr, [sp] ; load back output pitch ldr r12, [sp, #4] ; load back output pitch subs r7, r7, #1 add r0, r0, r12 ; updata src for next loop add r1, r1, lr ; update dst for next loop bne height_loop_1st_only_6 add sp, sp, #8 ldmia sp!, {r4 - r11, pc} ENDP ; |vp8_filter_block2d_first_pass_only_armv6| ;------------------------------------ ; r0 unsigned char *src_ptr, ; r1 unsigned char *output_ptr, ; r2 unsigned int src_pixels_per_line ; r3 unsigned int cnt, ; stack unsigned int output_pitch, ; stack const short *vp8_filter ;------------------------------------ |vp8_filter_block2d_second_pass_only_armv6| PROC stmdb sp!, {r4 - r11, lr} ldr r11, [sp, #40] ; VFilter address ldr r12, [sp, #36] ; output pitch mov r7, r3, lsl #16 ; height is top part of counter sub r0, r0, r2, lsl #1 ; need 6 elements for filtering, 2 before, 3 after sub sp, sp, #8 ldr r4, [r11] ; load up packed filter coefficients ldr r5, [r11, #4] ldr r6, [r11, #8] str r0, [sp] ; save r0 to stack str r1, [sp, #4] ; save dst to stack ; six tap filter |width_loop_2nd_only_6| ldrb r8, [r0], r2 ; load data orr r7, r7, r3 ; loop counter ldrb r9, [r0], r2 ldrb r10, [r0], r2 |height_loop_2nd_only_6| ; filter first column in this inner loop, than, move to next colum. ldrb r11, [r0], r2 pkhbt lr, r8, r9, lsl #16 ; r9 | r8 pkhbt r8, r9, r10, lsl #16 ; r10 | r9 ldrb r9, [r0], r2 smuad lr, lr, r4 pkhbt r10, r10, r11, lsl #16 ; r11 | r10 smuad r8, r8, r4 pkhbt r11, r11, r9, lsl #16 ; r9 | r11 smlad lr, r10, r5, lr ldrb r10, [r0], r2 smlad r8, r11, r5, r8 ldrb r11, [r0] sub r7, r7, #2 sub r0, r0, r2, lsl #2 pkhbt r9, r9, r10, lsl #16 ; r10 | r9 pkhbt r10, r10, r11, lsl #16 ; r11 | r10 smlad lr, r9, r6, lr smlad r10, r10, r6, r8 ands r9, r7, #0xff add lr, lr, #0x40 ; round_shift_and_clamp ldrneb r8, [r0], r2 ; load data for next loop usat lr, #8, lr, asr #7 add r10, r10, #0x40 strb lr, [r1], r12 ; store the result for the column usat r10, #8, r10, asr #7 ldrneb r9, [r0], r2 strb r10, [r1], r12 ldrneb r10, [r0], r2 bne height_loop_2nd_only_6 ldr r0, [sp] ldr r1, [sp, #4] subs r7, r7, #0x10000 add r0, r0, #1 ; move to filter next column str r0, [sp] add r1, r1, #1 str r1, [sp, #4] bne width_loop_2nd_only_6 add sp, sp, #8 ldmia sp!, {r4 - r11, pc} ENDP ; |vp8_filter_block2d_second_pass_only_armv6| END