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arm: Add VFP-accelerated version of imdct_half
Before After
Mean StdDev Mean StdDev Change
This function 2653.0 28.5 1108.8 51.4 +139.3%
Overall 17049.5 408.2 15973.0 223.2 +6.7%
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö
parent
d6e4f5fef0
commit
b63bb251ea
@ -53,6 +53,7 @@ ARMV6-OBJS-$(CONFIG_VP8_DECODER) += arm/vp8_armv6.o \
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arm/vp8dsp_armv6.o
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VFP-OBJS-$(CONFIG_DCA_DECODER) += arm/synth_filter_vfp.o
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VFP-OBJS-$(CONFIG_MDCT) += arm/mdct_vfp.o
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VFP-OBJS-$(HAVE_ARMV6) += arm/fmtconvert_vfp.o
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NEON-OBJS += arm/fmtconvert_neon.o
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@ -26,6 +26,8 @@
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void ff_fft_permute_neon(FFTContext *s, FFTComplex *z);
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void ff_fft_calc_neon(FFTContext *s, FFTComplex *z);
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void ff_imdct_half_vfp(FFTContext *s, FFTSample *output, const FFTSample *input);
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void ff_imdct_calc_neon(FFTContext *s, FFTSample *output, const FFTSample *input);
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void ff_imdct_half_neon(FFTContext *s, FFTSample *output, const FFTSample *input);
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void ff_mdct_calc_neon(FFTContext *s, FFTSample *output, const FFTSample *input);
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@ -48,6 +50,13 @@ av_cold void ff_fft_init_arm(FFTContext *s)
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{
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int cpu_flags = av_get_cpu_flags();
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if (have_vfp(cpu_flags)) {
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#if CONFIG_MDCT
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if (!have_vfpv3(cpu_flags))
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s->imdct_half = ff_imdct_half_vfp;
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#endif
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}
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if (have_neon(cpu_flags)) {
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s->fft_permute = ff_fft_permute_neon;
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s->fft_calc = ff_fft_calc_neon;
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206
libavcodec/arm/mdct_vfp.S
Normal file
206
libavcodec/arm/mdct_vfp.S
Normal file
@ -0,0 +1,206 @@
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/*
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* Copyright (c) 2013 RISC OS Open Ltd
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* Author: Ben Avison <bavison@riscosopen.org>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/arm/asm.S"
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CONTEXT .req a1
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ORIGOUT .req a2
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IN .req a3
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OUT .req v1
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REVTAB .req v2
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TCOS .req v3
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TSIN .req v4
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OLDFPSCR .req v5
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J0 .req a2
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J1 .req a4
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J2 .req ip
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J3 .req lr
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.macro prerotation_innerloop
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.set trig_lo, k
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.set trig_hi, n4 - k - 2
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.set in_lo, trig_lo * 2
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.set in_hi, trig_hi * 2
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vldr d8, [TCOS, #trig_lo*4] @ s16,s17
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vldr d9, [TCOS, #trig_hi*4] @ s18,s19
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vldr s0, [IN, #in_hi*4 + 12]
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vldr s1, [IN, #in_hi*4 + 4]
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vldr s2, [IN, #in_lo*4 + 12]
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vldr s3, [IN, #in_lo*4 + 4]
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vmul.f s8, s0, s16 @ vector operation
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vldr d10, [TSIN, #trig_lo*4] @ s20,s21
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vldr d11, [TSIN, #trig_hi*4] @ s22,s23
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vldr s4, [IN, #in_lo*4]
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vldr s5, [IN, #in_lo*4 + 8]
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vldr s6, [IN, #in_hi*4]
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vldr s7, [IN, #in_hi*4 + 8]
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ldr J0, [REVTAB, #trig_lo*2]
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vmul.f s12, s0, s20 @ vector operation
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ldr J2, [REVTAB, #trig_hi*2]
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mov J1, J0, lsr #16
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and J0, J0, #255 @ halfword value will be < n4
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vmls.f s8, s4, s20 @ vector operation
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mov J3, J2, lsr #16
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and J2, J2, #255 @ halfword value will be < n4
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add J0, OUT, J0, lsl #3
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vmla.f s12, s4, s16 @ vector operation
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add J1, OUT, J1, lsl #3
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add J2, OUT, J2, lsl #3
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add J3, OUT, J3, lsl #3
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vstr s8, [J0]
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vstr s9, [J1]
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vstr s10, [J2]
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vstr s11, [J3]
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vstr s12, [J0, #4]
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vstr s13, [J1, #4]
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vstr s14, [J2, #4]
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vstr s15, [J3, #4]
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.set k, k + 2
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.endm
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.macro postrotation_innerloop tail, head
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.set trig_lo_head, n8 - k - 2
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.set trig_hi_head, n8 + k
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.set out_lo_head, trig_lo_head * 2
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.set out_hi_head, trig_hi_head * 2
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.set trig_lo_tail, n8 - (k - 2) - 2
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.set trig_hi_tail, n8 + (k - 2)
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.set out_lo_tail, trig_lo_tail * 2
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.set out_hi_tail, trig_hi_tail * 2
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.if (k & 2) == 0
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TCOS_D0_HEAD .req d10 @ s20,s21
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TCOS_D1_HEAD .req d11 @ s22,s23
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TCOS_S0_TAIL .req s24
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.else
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TCOS_D0_HEAD .req d12 @ s24,s25
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TCOS_D1_HEAD .req d13 @ s26,s27
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TCOS_S0_TAIL .req s20
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.endif
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.ifnc "\tail",""
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vmls.f s8, s0, TCOS_S0_TAIL @ vector operation
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.endif
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.ifnc "\head",""
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vldr d8, [TSIN, #trig_lo_head*4] @ s16,s17
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vldr d9, [TSIN, #trig_hi_head*4] @ s18,s19
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vldr TCOS_D0_HEAD, [TCOS, #trig_lo_head*4]
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.endif
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.ifnc "\tail",""
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vmla.f s12, s4, TCOS_S0_TAIL @ vector operation
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.endif
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.ifnc "\head",""
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vldr s0, [OUT, #out_lo_head*4]
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vldr s1, [OUT, #out_lo_head*4 + 8]
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vldr s2, [OUT, #out_hi_head*4]
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vldr s3, [OUT, #out_hi_head*4 + 8]
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vldr s4, [OUT, #out_lo_head*4 + 4]
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vldr s5, [OUT, #out_lo_head*4 + 12]
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vldr s6, [OUT, #out_hi_head*4 + 4]
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vldr s7, [OUT, #out_hi_head*4 + 12]
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.endif
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.ifnc "\tail",""
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vstr s8, [OUT, #out_lo_tail*4]
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vstr s9, [OUT, #out_lo_tail*4 + 8]
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vstr s10, [OUT, #out_hi_tail*4]
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vstr s11, [OUT, #out_hi_tail*4 + 8]
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.endif
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.ifnc "\head",""
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vmul.f s8, s4, s16 @ vector operation
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.endif
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.ifnc "\tail",""
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vstr s12, [OUT, #out_hi_tail*4 + 12]
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vstr s13, [OUT, #out_hi_tail*4 + 4]
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vstr s14, [OUT, #out_lo_tail*4 + 12]
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vstr s15, [OUT, #out_lo_tail*4 + 4]
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.endif
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.ifnc "\head",""
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vmul.f s12, s0, s16 @ vector operation
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vldr TCOS_D1_HEAD, [TCOS, #trig_hi_head*4]
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.endif
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.unreq TCOS_D0_HEAD
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.unreq TCOS_D1_HEAD
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.unreq TCOS_S0_TAIL
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.ifnc "\head",""
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.set k, k + 2
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.endif
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.endm
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/* void ff_imdct_half_vfp(FFTContext *s,
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* FFTSample *output,
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* const FFTSample *input)
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*/
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function ff_imdct_half_vfp, export=1
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ldr ip, [CONTEXT, #5*4] @ mdct_bits
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teq ip, #6
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it ne
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bne ff_imdct_half_c @ only case currently accelerated is the one used by DCA
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.set n, 1<<6
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.set n2, n/2
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.set n4, n/4
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.set n8, n/8
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push {v1-v5,lr}
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vpush {s16-s27}
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fmrx OLDFPSCR, FPSCR
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ldr lr, =0x03030000 @ RunFast mode, short vectors of length 4, stride 1
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fmxr FPSCR, lr
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mov OUT, ORIGOUT
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ldr REVTAB, [CONTEXT, #2*4]
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ldr TCOS, [CONTEXT, #6*4]
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ldr TSIN, [CONTEXT, #7*4]
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.set k, 0
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.rept n8/2
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prerotation_innerloop
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.endr
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fmxr FPSCR, OLDFPSCR
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mov ORIGOUT, OUT
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ldr ip, [CONTEXT, #9*4]
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blx ip @ s->fft_calc(s, output)
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ldr lr, =0x03030000 @ RunFast mode, short vectors of length 4, stride 1
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fmxr FPSCR, lr
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.set k, 0
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postrotation_innerloop , head
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.rept n8/2 - 1
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postrotation_innerloop tail, head
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.endr
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postrotation_innerloop tail
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fmxr FPSCR, OLDFPSCR
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vpop {s16-s27}
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pop {v1-v5,pc}
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endfunc
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.unreq CONTEXT
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.unreq ORIGOUT
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.unreq IN
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.unreq OUT
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.unreq REVTAB
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.unreq TCOS
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.unreq TSIN
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.unreq OLDFPSCR
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.unreq J0
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.unreq J1
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.unreq J2
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.unreq J3
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@ -132,7 +132,7 @@ function ff_synth_filter_float_vfp, export=1
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str lr, [P_SB_OFF] @ rotate offset, modulo buffer size, ready for next call
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ldr a3, [sp, #(16+6+2)*4] @ fetch in from stack, to pass to imdct_half
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VFP vmov s16, SCALE @ imdct_half is free to corrupt s0, but it contains one of our arguments in hardfp case
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bl ff_imdct_half_c
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bl ff_imdct_half_vfp
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VFP vmov SCALE, s16
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fmrx OLDFPSCR, FPSCR
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