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ARM: NEON optimised RDFT

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Originally committed as revision 22641 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-03-23 03:35:02 +00:00
parent fc4a2d1e8c
commit a8bb9ea532
5 changed files with 168 additions and 0 deletions
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2
libavcodec/arm/Makefile
View File

@ -27,6 +27,8 @@ NEON-OBJS-$(CONFIG_FFT) += arm/fft_neon.o \
NEON-OBJS-$(CONFIG_MDCT) += arm/mdct_neon.o \
NEON-OBJS-$(CONFIG_RDFT) += arm/rdft_neon.o \
NEON-OBJS-$(CONFIG_H264DSP) += arm/h264dsp_neon.o \
arm/h264idct_neon.o \
arm/h264pred_neon.o \

10
libavcodec/arm/fft_init_arm.c
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@ -27,6 +27,8 @@ void ff_imdct_calc_neon(FFTContext *s, FFTSample *output, const FFTSample *input
void ff_imdct_half_neon(FFTContext *s, FFTSample *output, const FFTSample *input);
void ff_mdct_calc_neon(FFTContext *s, FFTSample *output, const FFTSample *input);
void ff_rdft_calc_neon(struct RDFTContext *s, FFTSample *z);
av_cold void ff_fft_init_arm(FFTContext *s)
{
if (HAVE_NEON) {
@ -38,3 +40,11 @@ av_cold void ff_fft_init_arm(FFTContext *s)
s->permutation = FF_MDCT_PERM_INTERLEAVE;
}
}
#if CONFIG_RDFT
av_cold void ff_rdft_init_arm(RDFTContext *s)
{
if (HAVE_NEON)
s->rdft_calc = ff_rdft_calc_neon;
}
#endif

151
libavcodec/arm/rdft_neon.S Normal file
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@ -0,0 +1,151 @@
/*
* ARM NEON optimised RDFT
* Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
*
* 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 "asm.S"
preserve8
function ff_rdft_calc_neon, export=1
push {r4-r8,lr}
ldr r6, [r0, #4] @ inverse
mov r4, r0
mov r5, r1
lsls r6, r6, #31
bne 1f
add r0, r4, #20
bl ff_fft_permute_neon
add r0, r4, #20
mov r1, r5
bl ff_fft_calc_neon
1:
ldr r12, [r4, #0] @ nbits
mov r2, #1
lsl r12, r2, r12
add r0, r5, #8
add r1, r5, r12, lsl #2
lsr r12, r12, #2
ldr r2, [r4, #12] @ tcos
sub r12, r12, #2
ldr r3, [r4, #16] @ tsin
mov r7, r0
sub r1, r1, #8
mov lr, r1
mov r8, #-8
vld1.32 {d0}, [r0,:64]! @ d1[0,1]
vld1.32 {d1}, [r1,:64], r8 @ d2[0,1]
vld1.32 {d4}, [r2,:64]! @ tcos[i]
vld1.32 {d5}, [r3,:64]! @ tsin[i]
vmov.f32 d18, #0.5 @ k1
vdup.32 d19, r6
pld [r0, #32]
veor d19, d18, d19 @ k2
vmov.i32 d16, #0
vmov.i32 d17, #1<<31
pld [r1, #-32]
vtrn.32 d16, d17
pld [r2, #32]
vrev64.32 d16, d16 @ d16=1,0 d17=0,1
pld [r3, #32]
2:
veor q1, q0, q8 @ -d1[0],d1[1], d2[0],-d2[1]
vld1.32 {d24}, [r0,:64]! @ d1[0,1]
vadd.f32 d0, d0, d3 @ d1[0]+d2[0], d1[1]-d2[1]
vld1.32 {d25}, [r1,:64], r8 @ d2[0,1]
vadd.f32 d1, d2, d1 @ -d1[0]+d2[0], d1[1]+d2[1]
veor q3, q12, q8 @ -d1[0],d1[1], d2[0],-d2[1]
pld [r0, #32]
vmul.f32 q10, q0, q9 @ ev.re, ev.im, od.im, od.re
pld [r1, #-32]
vadd.f32 d0, d24, d7 @ d1[0]+d2[0], d1[1]-d2[1]
vadd.f32 d1, d6, d25 @ -d1[0]+d2[0], d1[1]+d2[1]
vmul.f32 q11, q0, q9 @ ev.re, ev.im, od.im, od.re
veor d7, d21, d16 @ -od.im, od.re
vrev64.32 d3, d21 @ od.re, od.im
veor d6, d20, d17 @ ev.re,-ev.im
veor d2, d3, d16 @ -od.re, od.im
vmla.f32 d20, d3, d4[1]
vmla.f32 d20, d7, d5[1]
vmla.f32 d6, d2, d4[1]
vmla.f32 d6, d21, d5[1]
vld1.32 {d4}, [r2,:64]! @ tcos[i]
veor d7, d23, d16 @ -od.im, od.re
vld1.32 {d5}, [r3,:64]! @ tsin[i]
veor d24, d22, d17 @ ev.re,-ev.im
vrev64.32 d3, d23 @ od.re, od.im
pld [r2, #32]
veor d2, d3, d16 @ -od.re, od.im
pld [r3, #32]
vmla.f32 d22, d3, d4[0]
vmla.f32 d22, d7, d5[0]
vmla.f32 d24, d2, d4[0]
vmla.f32 d24, d23, d5[0]
vld1.32 {d0}, [r0,:64]! @ d1[0,1]
vld1.32 {d1}, [r1,:64], r8 @ d2[0,1]
vst1.32 {d20}, [r7,:64]!
vst1.32 {d6}, [lr,:64], r8
vst1.32 {d22}, [r7,:64]!
vst1.32 {d24}, [lr,:64], r8
subs r12, r12, #2
bgt 2b
veor q1, q0, q8 @ -d1[0],d1[1], d2[0],-d2[1]
vadd.f32 d0, d0, d3 @ d1[0]+d2[0], d1[1]-d2[1]
vadd.f32 d1, d2, d1 @ -d1[0]+d2[0], d1[1]+d2[1]
ldr r2, [r4, #8] @ sign_convention
vmul.f32 q10, q0, q9 @ ev.re, ev.im, od.im, od.re
add r0, r0, #4
bfc r2, #0, #31
vld1.32 {d0[0]}, [r0,:32]
veor d7, d21, d16 @ -od.im, od.re
vrev64.32 d3, d21 @ od.re, od.im
veor d6, d20, d17 @ ev.re,-ev.im
vld1.32 {d22}, [r5,:64]
vdup.32 d1, r2
vmov d23, d22
veor d2, d3, d16 @ -od.re, od.im
vtrn.32 d22, d23
veor d0, d0, d1
veor d23, d23, d17
vmla.f32 d20, d3, d4[1]
vmla.f32 d20, d7, d5[1]
vmla.f32 d6, d2, d4[1]
vmla.f32 d6, d21, d5[1]
vadd.f32 d22, d22, d23
vst1.32 {d20}, [r7,:64]
vst1.32 {d6}, [lr,:64]
vst1.32 {d0[0]}, [r0,:32]
vst1.32 {d22}, [r5,:64]
cmp r6, #0
popeq {r4-r8,pc}
vmul.f32 d22, d22, d18
vst1.32 {d22}, [r5,:64]
add r0, r4, #20
mov r1, r5
bl ff_fft_permute_neon
add r0, r4, #20
mov r1, r5
pop {r4-r8,lr}
b ff_fft_calc_neon
endfunc

2
libavcodec/fft.h
View File

@ -207,6 +207,8 @@ struct RDFTContext {
int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans);
void ff_rdft_end(RDFTContext *s);
void ff_rdft_init_arm(RDFTContext *s);
static av_always_inline void ff_rdft_calc(RDFTContext *s, FFTSample *data)
{
s->rdft_calc(s, data);

3
libavcodec/rdft.c
View File

@ -121,6 +121,9 @@ av_cold int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans)
}
#endif
s->rdft_calc = ff_rdft_calc_c;
if (ARCH_ARM) ff_rdft_init_arm(s);
return 0;
}