diff options
author | Ben Avison <bavison@riscosopen.org> | 2014-03-20 22:59:14 +0400 |
---|---|---|
committer | Michael Niedermayer <michaelni@gmx.at> | 2014-03-26 23:22:18 +0400 |
commit | 87b128d5ef6aeb01cc8bba167c929c74cbf2e7c7 (patch) | |
tree | 4536015fb8b2039d45e13a869046238815a6aa24 /libavcodec | |
parent | 3017239d3a6f1c4049394be49ae207cd4475ad53 (diff) |
truehd: add hand-scheduled ARM asm version of mlp_filter_channel.
Profiling results for overall audio decode and the mlp_filter_channel(_arm)
function in particular are as follows:
Before After
Mean StdDev Mean StdDev Confidence Change
6:2 total 380.4 22.0 370.8 17.0 87.4% +2.6% (insignificant)
6:2 function 60.7 7.2 36.6 8.1 100.0% +65.8%
8:2 total 357.0 17.5 343.2 19.0 97.8% +4.0% (insignificant)
8:2 function 60.3 8.8 37.3 3.8 100.0% +61.8%
6:6 total 717.2 23.2 658.4 15.7 100.0% +8.9%
6:6 function 140.4 12.9 81.5 9.2 100.0% +72.4%
8:8 total 981.9 16.2 896.2 24.5 100.0% +9.6%
8:8 function 193.4 15.0 103.3 11.5 100.0% +87.2%
Experiments with adding preload instructions to this function yielded no
useful benefit, so these have not been included.
The assembly version has also been tested with a fuzz tester to ensure that
any combinations of inputs not exercised by my available test streams still
generate mathematically identical results to the C version.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec')
-rw-r--r-- | libavcodec/arm/Makefile | 2 | ||||
-rw-r--r-- | libavcodec/arm/mlpdsp_arm.S | 433 | ||||
-rw-r--r-- | libavcodec/arm/mlpdsp_init_arm.c | 36 | ||||
-rw-r--r-- | libavcodec/mlpdsp.c | 2 | ||||
-rw-r--r-- | libavcodec/mlpdsp.h | 1 |
5 files changed, 474 insertions, 0 deletions
diff --git a/libavcodec/arm/Makefile b/libavcodec/arm/Makefile index ed302e65c0..4658223965 100644 --- a/libavcodec/arm/Makefile +++ b/libavcodec/arm/Makefile @@ -16,6 +16,8 @@ OBJS-$(CONFIG_H264PRED) += arm/h264pred_init_arm.o OBJS-$(CONFIG_H264QPEL) += arm/h264qpel_init_arm.o OBJS-$(CONFIG_HPELDSP) += arm/hpeldsp_init_arm.o \ arm/hpeldsp_arm.o +OBJS-$(CONFIG_MLP_DECODER) += arm/mlpdsp_init_arm.o \ + arm/mlpdsp_arm.o OBJS-$(CONFIG_MPEGAUDIODSP) += arm/mpegaudiodsp_init_arm.o OBJS-$(CONFIG_MPEGVIDEO) += arm/mpegvideo_arm.o OBJS-$(CONFIG_NEON_CLOBBER_TEST) += arm/neontest.o diff --git a/libavcodec/arm/mlpdsp_arm.S b/libavcodec/arm/mlpdsp_arm.S new file mode 100644 index 0000000000..615819d3fe --- /dev/null +++ b/libavcodec/arm/mlpdsp_arm.S @@ -0,0 +1,433 @@ +/* + * Copyright (c) 2014 RISC OS Open Ltd + * Author: Ben Avison <bavison@riscosopen.org> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/arm/asm.S" + +#define MAX_CHANNELS 8 +#define MAX_FIR_ORDER 8 +#define MAX_IIR_ORDER 4 +#define MAX_RATEFACTOR 4 +#define MAX_BLOCKSIZE (40 * MAX_RATEFACTOR) + +PST .req a1 +PCO .req a2 +AC0 .req a3 +AC1 .req a4 +CO0 .req v1 +CO1 .req v2 +CO2 .req v3 +CO3 .req v4 +ST0 .req v5 +ST1 .req v6 +ST2 .req sl +ST3 .req fp +I .req ip +PSAMP .req lr + + +// Some macros that do loads/multiplies where the register number is determined +// from an assembly-time expression. Boy is GNU assembler's syntax ugly... + +.macro load group, index, base, offset + .altmacro + load_ \group, %(\index), \base, \offset + .noaltmacro +.endm + +.macro load_ group, index, base, offset + ldr \group\index, [\base, #\offset] +.endm + +.macro loadd group, index, base, offset + .altmacro + loadd_ \group, %(\index), %(\index+1), \base, \offset + .noaltmacro +.endm + +.macro loadd_ group, index0, index1, base, offset +A .if offset >= 256 +A ldr \group\index0, [\base, #\offset] +A ldr \group\index1, [\base, #(\offset) + 4] +A .else + ldrd \group\index0, \group\index1, [\base, #\offset] +A .endif +.endm + +.macro multiply index, accumulate, long + .altmacro + multiply_ %(\index), \accumulate, \long + .noaltmacro +.endm + +.macro multiply_ index, accumulate, long + .if \long + .if \accumulate + smlal AC0, AC1, CO\index, ST\index + .else + smull AC0, AC1, CO\index, ST\index + .endif + .else + .if \accumulate + mla AC0, CO\index, ST\index, AC0 + .else + mul AC0, CO\index, ST\index + .endif + .endif +.endm + +// A macro to update the load register number and load offsets + +.macro inc howmany + .set LOAD_REG, (LOAD_REG + \howmany) & 3 + .set OFFSET_CO, OFFSET_CO + 4 * \howmany + .set OFFSET_ST, OFFSET_ST + 4 * \howmany + .if FIR_REMAIN > 0 + .set FIR_REMAIN, FIR_REMAIN - \howmany + .if FIR_REMAIN == 0 + .set OFFSET_CO, 4 * MAX_FIR_ORDER + .set OFFSET_ST, 4 * (MAX_BLOCKSIZE + MAX_FIR_ORDER) + .endif + .elseif IIR_REMAIN > 0 + .set IIR_REMAIN, IIR_REMAIN - \howmany + .endif +.endm + +// Macro to implement the inner loop for one specific combination of parameters + +.macro implement_filter mask_minus1, shift_0, shift_8, iir_taps, fir_taps + .set TOTAL_TAPS, \iir_taps + \fir_taps + + // Deal with register allocation... + .set DEFINED_SHIFT, 0 + .set DEFINED_MASK, 0 + .set SHUFFLE_SHIFT, 0 + .set SHUFFLE_MASK, 0 + .set SPILL_SHIFT, 0 + .set SPILL_MASK, 0 + .if TOTAL_TAPS == 0 + // Little register pressure in this case - just keep MASK where it was + .if !\mask_minus1 + MASK .req ST1 + .set DEFINED_MASK, 1 + .endif + .else + .if \shift_0 + .if !\mask_minus1 + // AC1 is unused with shift 0 + MASK .req AC1 + .set DEFINED_MASK, 1 + .set SHUFFLE_MASK, 1 + .endif + .elseif \shift_8 + .if !\mask_minus1 + .if TOTAL_TAPS <= 4 + // All coefficients are preloaded (so pointer not needed) + MASK .req PCO + .set DEFINED_MASK, 1 + .set SHUFFLE_MASK, 1 + .else + .set SPILL_MASK, 1 + .endif + .endif + .else // shift not 0 or 8 + .if TOTAL_TAPS <= 3 + // All coefficients are preloaded, and at least one CO register is unused + .if \fir_taps & 1 + SHIFT .req CO0 + .set DEFINED_SHIFT, 1 + .set SHUFFLE_SHIFT, 1 + .else + SHIFT .req CO3 + .set DEFINED_SHIFT, 1 + .set SHUFFLE_SHIFT, 1 + .endif + .if !\mask_minus1 + MASK .req PCO + .set DEFINED_MASK, 1 + .set SHUFFLE_MASK, 1 + .endif + .elseif TOTAL_TAPS == 4 + // All coefficients are preloaded + SHIFT .req PCO + .set DEFINED_SHIFT, 1 + .set SHUFFLE_SHIFT, 1 + .if !\mask_minus1 + .set SPILL_MASK, 1 + .endif + .else + .set SPILL_SHIFT, 1 + .if !\mask_minus1 + .set SPILL_MASK, 1 + .endif + .endif + .endif + .endif + .if SPILL_SHIFT + SHIFT .req ST0 + .set DEFINED_SHIFT, 1 + .endif + .if SPILL_MASK + MASK .req ST1 + .set DEFINED_MASK, 1 + .endif + + // Preload coefficients if possible + .if TOTAL_TAPS <= 4 + .set OFFSET_CO, 0 + .if \fir_taps & 1 + .set LOAD_REG, 1 + .else + .set LOAD_REG, 0 + .endif + .rept \fir_taps + load CO, LOAD_REG, PCO, OFFSET_CO + .set LOAD_REG, (LOAD_REG + 1) & 3 + .set OFFSET_CO, OFFSET_CO + 4 + .endr + .set OFFSET_CO, 4 * MAX_FIR_ORDER + .rept \iir_taps + load CO, LOAD_REG, PCO, OFFSET_CO + .set LOAD_REG, (LOAD_REG + 1) & 3 + .set OFFSET_CO, OFFSET_CO + 4 + .endr + .endif + + // Move mask/shift to final positions if necessary + // Need to do this after preloading, because in some cases we + // reuse the coefficient pointer register + .if SHUFFLE_SHIFT + mov SHIFT, ST0 + .endif + .if SHUFFLE_MASK + mov MASK, ST1 + .endif + + // Begin loop +01: + .if TOTAL_TAPS == 0 + // Things simplify a lot in this case + // In fact this could be pipelined further if it's worth it... + ldr ST0, [PSAMP] + subs I, I, #1 + .if !\mask_minus1 + and ST0, ST0, MASK + .endif + str ST0, [PST, #-4]! + str ST0, [PST, #4 * (MAX_BLOCKSIZE + MAX_FIR_ORDER)] + str ST0, [PSAMP], #4 * MAX_CHANNELS + bne 01b + .else + .if \fir_taps & 1 + .set LOAD_REG, 1 + .else + .set LOAD_REG, 0 + .endif + .set LOAD_BANK, 0 + .set FIR_REMAIN, \fir_taps + .set IIR_REMAIN, \iir_taps + .if FIR_REMAIN == 0 // only IIR terms + .set OFFSET_CO, 4 * MAX_FIR_ORDER + .set OFFSET_ST, 4 * (MAX_BLOCKSIZE + MAX_FIR_ORDER) + .else + .set OFFSET_CO, 0 + .set OFFSET_ST, 0 + .endif + .set MUL_REG, LOAD_REG + .set COUNTER, 0 + .rept TOTAL_TAPS + 2 + // Do load(s) + .if FIR_REMAIN != 0 || IIR_REMAIN != 0 + .if COUNTER == 0 + .if TOTAL_TAPS > 4 + load CO, LOAD_REG, PCO, OFFSET_CO + .endif + load ST, LOAD_REG, PST, OFFSET_ST + inc 1 + .elseif COUNTER == 1 && (\fir_taps & 1) == 0 + .if TOTAL_TAPS > 4 + load CO, LOAD_REG, PCO, OFFSET_CO + .endif + load ST, LOAD_REG, PST, OFFSET_ST + inc 1 + .elseif LOAD_BANK == 0 + .if TOTAL_TAPS > 4 + .if FIR_REMAIN == 0 && IIR_REMAIN == 1 + load CO, LOAD_REG, PCO, OFFSET_CO + .else + loadd CO, LOAD_REG, PCO, OFFSET_CO + .endif + .endif + .set LOAD_BANK, 1 + .else + .if FIR_REMAIN == 0 && IIR_REMAIN == 1 + load ST, LOAD_REG, PST, OFFSET_ST + inc 1 + .else + loadd ST, LOAD_REG, PST, OFFSET_ST + inc 2 + .endif + .set LOAD_BANK, 0 + .endif + .endif + + // Do interleaved multiplies, slightly delayed + .if COUNTER >= 2 + multiply MUL_REG, COUNTER > 2, !\shift_0 + .set MUL_REG, (MUL_REG + 1) & 3 + .endif + .set COUNTER, COUNTER + 1 + .endr + + // Post-process the result of the multiplies + .if SPILL_SHIFT + ldr SHIFT, [sp, #9*4 + 0*4] + .endif + .if SPILL_MASK + ldr MASK, [sp, #9*4 + 1*4] + .endif + ldr ST2, [PSAMP] + subs I, I, #1 + .if \shift_8 + mov AC0, AC0, lsr #8 + orr AC0, AC0, AC1, lsl #24 + .elseif !\shift_0 + rsb ST3, SHIFT, #32 + mov AC0, AC0, lsr SHIFT +A orr AC0, AC0, AC1, lsl ST3 +T mov AC1, AC1, lsl ST3 +T orr AC0, AC0, AC1 + .endif + .if \mask_minus1 + add ST3, ST2, AC0 + .else + add ST2, ST2, AC0 + and ST3, ST2, MASK + sub ST2, ST3, AC0 + .endif + str ST3, [PST, #-4]! + str ST2, [PST, #4 * (MAX_BLOCKSIZE + MAX_FIR_ORDER)] + str ST3, [PSAMP], #4 * MAX_CHANNELS + bne 01b + .endif + b 99f + + .if DEFINED_SHIFT + .unreq SHIFT + .endif + .if DEFINED_MASK + .unreq MASK + .endif +.endm + +.macro switch_on_fir_taps mask_minus1, shift_0, shift_8, iir_taps +A ldr pc, [pc, a3, LSL #2] // firorder is in range 0-(8-iir_taps) +T tbh [pc, a3, lsl #1] +0: +A .word 0, 70f, 71f, 72f, 73f, 74f +T .hword (70f - 0b) / 2, (71f - 0b) / 2, (72f - 0b) / 2, (73f - 0b) / 2, (74f - 0b) / 2 + .if \iir_taps <= 3 +A .word 75f +T .hword (75f - 0b) / 2 + .if \iir_taps <= 2 +A .word 76f +T .hword (76f - 0b) / 2 + .if \iir_taps <= 1 +A .word 77f +T .hword (77f - 0b) / 2 + .if \iir_taps == 0 +A .word 78f +T .hword (78f - 0b) / 2 + .endif + .endif + .endif + .endif +70: implement_filter \mask_minus1, \shift_0, \shift_8, \iir_taps, 0 +71: implement_filter \mask_minus1, \shift_0, \shift_8, \iir_taps, 1 +72: implement_filter \mask_minus1, \shift_0, \shift_8, \iir_taps, 2 +73: implement_filter \mask_minus1, \shift_0, \shift_8, \iir_taps, 3 +74: implement_filter \mask_minus1, \shift_0, \shift_8, \iir_taps, 4 + .if \iir_taps <= 3 +75: implement_filter \mask_minus1, \shift_0, \shift_8, \iir_taps, 5 + .if \iir_taps <= 2 +76: implement_filter \mask_minus1, \shift_0, \shift_8, \iir_taps, 6 + .if \iir_taps <= 1 +77: implement_filter \mask_minus1, \shift_0, \shift_8, \iir_taps, 7 + .if \iir_taps == 0 +78: implement_filter \mask_minus1, \shift_0, \shift_8, \iir_taps, 8 + .endif + .endif + .endif + .endif +.endm + +.macro switch_on_iir_taps mask_minus1, shift_0, shift_8 +A ldr pc, [pc, a4, LSL #2] // irorder is in range 0-4 +T tbh [pc, a4, lsl #1] +0: +A .word 0, 60f, 61f, 62f, 63f, 64f +T .hword (60f - 0b) / 2, (61f - 0b) / 2, (62f - 0b) / 2, (63f - 0b) / 2, (64f - 0b) / 2 +60: switch_on_fir_taps \mask_minus1, \shift_0, \shift_8, 0 +61: switch_on_fir_taps \mask_minus1, \shift_0, \shift_8, 1 +62: switch_on_fir_taps \mask_minus1, \shift_0, \shift_8, 2 +63: switch_on_fir_taps \mask_minus1, \shift_0, \shift_8, 3 +64: switch_on_fir_taps \mask_minus1, \shift_0, \shift_8, 4 +.endm + +/* void ff_mlp_filter_channel_arm(int32_t *state, const int32_t *coeff, + * int firorder, int iirorder, + * unsigned int filter_shift, int32_t mask, + * int blocksize, int32_t *sample_buffer); + */ +function ff_mlp_filter_channel_arm, export=1 + push {v1-fp,lr} + add v1, sp, #9*4 // point at arguments on stack + ldm v1, {ST0,ST1,I,PSAMP} + cmp ST1, #-1 + bne 30f + movs ST2, ST0, lsl #29 // shift is in range 0-15; we want to special-case 0 and 8 + bne 20f + bcs 10f + switch_on_iir_taps 1, 1, 0 +10: switch_on_iir_taps 1, 0, 1 +20: switch_on_iir_taps 1, 0, 0 +30: movs ST2, ST0, lsl #29 // shift is in range 0-15; we want to special-case 0 and 8 + bne 50f + bcs 40f + switch_on_iir_taps 0, 1, 0 +40: switch_on_iir_taps 0, 0, 1 +50: switch_on_iir_taps 0, 0, 0 +99: pop {v1-fp,pc} +endfunc + + .unreq PST + .unreq PCO + .unreq AC0 + .unreq AC1 + .unreq CO0 + .unreq CO1 + .unreq CO2 + .unreq CO3 + .unreq ST0 + .unreq ST1 + .unreq ST2 + .unreq ST3 + .unreq I + .unreq PSAMP diff --git a/libavcodec/arm/mlpdsp_init_arm.c b/libavcodec/arm/mlpdsp_init_arm.c new file mode 100644 index 0000000000..9a14815463 --- /dev/null +++ b/libavcodec/arm/mlpdsp_init_arm.c @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2014 RISC OS Open Ltd + * Author: Ben Avison <bavison@riscosopen.org> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stdint.h> + +#include "libavutil/arm/cpu.h" +#include "libavutil/attributes.h" +#include "libavcodec/mlpdsp.h" + +void ff_mlp_filter_channel_arm(int32_t *state, const int32_t *coeff, + int firorder, int iirorder, + unsigned int filter_shift, int32_t mask, + int blocksize, int32_t *sample_buffer); + +av_cold void ff_mlpdsp_init_arm(MLPDSPContext *c) +{ + c->mlp_filter_channel = ff_mlp_filter_channel_arm; +} diff --git a/libavcodec/mlpdsp.c b/libavcodec/mlpdsp.c index b413e86db5..4b403b8e82 100644 --- a/libavcodec/mlpdsp.c +++ b/libavcodec/mlpdsp.c @@ -60,6 +60,8 @@ static void mlp_filter_channel(int32_t *state, const int32_t *coeff, av_cold void ff_mlpdsp_init(MLPDSPContext *c) { c->mlp_filter_channel = mlp_filter_channel; + if (ARCH_ARM) + ff_mlpdsp_init_arm(c); if (ARCH_X86) ff_mlpdsp_init_x86(c); } diff --git a/libavcodec/mlpdsp.h b/libavcodec/mlpdsp.h index 84a8aa3a3e..129bcfe7fb 100644 --- a/libavcodec/mlpdsp.h +++ b/libavcodec/mlpdsp.h @@ -32,6 +32,7 @@ typedef struct MLPDSPContext { } MLPDSPContext; void ff_mlpdsp_init(MLPDSPContext *c); +void ff_mlpdsp_init_arm(MLPDSPContext *c); void ff_mlpdsp_init_x86(MLPDSPContext *c); #endif /* AVCODEC_MLPDSP_H */ |