2013-07-19 08:23:57 +00:00
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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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2013-07-22 10:05:16 +00:00
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* This file is part of FFmpeg.
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2013-07-19 08:23:57 +00:00
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*
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2013-07-22 10:05:16 +00:00
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* FFmpeg is free software; you can redistribute it and/or
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2013-07-19 08:23:57 +00:00
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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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2013-07-22 10:05:16 +00:00
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* FFmpeg is distributed in the hope that it will be useful,
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2013-07-19 08:23:57 +00:00
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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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2013-07-22 10:05:16 +00:00
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* License along with FFmpeg; if not, write to the Free Software
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2013-07-19 08:23:57 +00:00
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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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@ TODO: * FFTs wider than 16
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@ * dispatch code
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function fft4_vfp
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vldr d0, [a1, #0*2*4] @ s0,s1 = z[0]
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vldr d4, [a1, #1*2*4] @ s8,s9 = z[1]
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vldr d1, [a1, #2*2*4] @ s2,s3 = z[2]
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vldr d5, [a1, #3*2*4] @ s10,s11 = z[3]
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@ stall
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vadd.f s12, s0, s8 @ i0
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vadd.f s13, s1, s9 @ i1
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vadd.f s14, s2, s10 @ i2
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vadd.f s15, s3, s11 @ i3
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vsub.f s8, s0, s8 @ i4
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vsub.f s9, s1, s9 @ i5
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vsub.f s10, s2, s10 @ i6
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vsub.f s11, s3, s11 @ i7
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@ stall
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@ stall
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vadd.f s0, s12, s14 @ z[0].re
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vsub.f s4, s12, s14 @ z[2].re
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vadd.f s1, s13, s15 @ z[0].im
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vsub.f s5, s13, s15 @ z[2].im
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vadd.f s7, s9, s10 @ z[3].im
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vsub.f s3, s9, s10 @ z[1].im
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vadd.f s2, s8, s11 @ z[1].re
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vsub.f s6, s8, s11 @ z[3].re
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@ stall
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@ stall
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vstr d0, [a1, #0*2*4]
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vstr d2, [a1, #2*2*4]
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@ stall
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@ stall
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vstr d1, [a1, #1*2*4]
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vstr d3, [a1, #3*2*4]
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bx lr
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endfunc
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.macro macro_fft8_head
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@ FFT4
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vldr d4, [a1, #0 * 2*4]
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vldr d6, [a1, #1 * 2*4]
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vldr d5, [a1, #2 * 2*4]
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vldr d7, [a1, #3 * 2*4]
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@ BF
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vldr d12, [a1, #4 * 2*4]
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vadd.f s16, s8, s12 @ vector op
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vldr d14, [a1, #5 * 2*4]
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vldr d13, [a1, #6 * 2*4]
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vldr d15, [a1, #7 * 2*4]
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vsub.f s20, s8, s12 @ vector op
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vadd.f s0, s16, s18
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vsub.f s2, s16, s18
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vadd.f s1, s17, s19
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vsub.f s3, s17, s19
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vadd.f s7, s21, s22
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vsub.f s5, s21, s22
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vadd.f s4, s20, s23
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vsub.f s6, s20, s23
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vsub.f s20, s24, s28 @ vector op
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vstr d0, [a1, #0 * 2*4] @ transfer s0-s7 to s24-s31 via memory
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vstr d1, [a1, #1 * 2*4]
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vldr s0, cos1pi4
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vadd.f s16, s24, s28 @ vector op
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vstr d2, [a1, #2 * 2*4]
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vstr d3, [a1, #3 * 2*4]
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vldr d12, [a1, #0 * 2*4]
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@ TRANSFORM
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vmul.f s20, s20, s0 @ vector x scalar op
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vldr d13, [a1, #1 * 2*4]
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vldr d14, [a1, #2 * 2*4]
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vldr d15, [a1, #3 * 2*4]
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@ BUTTERFLIES
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vadd.f s0, s18, s16
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vadd.f s1, s17, s19
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vsub.f s2, s17, s19
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vsub.f s3, s18, s16
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vadd.f s4, s21, s20
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vsub.f s5, s21, s20
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vadd.f s6, s22, s23
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vsub.f s7, s22, s23
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vadd.f s8, s0, s24 @ vector op
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vstr d0, [a1, #0 * 2*4] @ transfer s0-s3 to s12-s15 via memory
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vstr d1, [a1, #1 * 2*4]
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vldr d6, [a1, #0 * 2*4]
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vldr d7, [a1, #1 * 2*4]
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vadd.f s1, s5, s6
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vadd.f s0, s7, s4
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vsub.f s2, s5, s6
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vsub.f s3, s7, s4
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vsub.f s12, s24, s12 @ vector op
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vsub.f s5, s29, s1
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vsub.f s4, s28, s0
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vsub.f s6, s30, s2
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vsub.f s7, s31, s3
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vadd.f s16, s0, s28 @ vector op
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vstr d6, [a1, #4 * 2*4]
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vstr d7, [a1, #6 * 2*4]
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vstr d4, [a1, #0 * 2*4]
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vstr d5, [a1, #2 * 2*4]
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vstr d2, [a1, #5 * 2*4]
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vstr d3, [a1, #7 * 2*4]
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.endm
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.macro macro_fft8_tail
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vstr d8, [a1, #1 * 2*4]
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vstr d9, [a1, #3 * 2*4]
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.endm
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function fft8_vfp
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ldr a3, =0x03030000 @ RunFast mode, vector length 4, stride 1
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fmrx a2, FPSCR
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fmxr FPSCR, a3
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vpush {s16-s31}
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macro_fft8_head
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macro_fft8_tail
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vpop {s16-s31}
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fmxr FPSCR, a2
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bx lr
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endfunc
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.align 3
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cos1pi4: @ cos(1*pi/4) = sqrt(2)
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.float 0.707106769084930419921875
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cos1pi8: @ cos(1*pi/8) = sqrt(2+sqrt(2))/2
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.float 0.92387950420379638671875
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cos3pi8: @ cos(2*pi/8) = sqrt(2-sqrt(2))/2
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.float 0.3826834261417388916015625
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function ff_fft16_vfp, export=1
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ldr a3, =0x03030000 @ RunFast mode, vector length 4, stride 1
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fmrx a2, FPSCR
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fmxr FPSCR, a3
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vpush {s16-s31}
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macro_fft8_head
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@ FFT4(z+8)
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vldr d10, [a1, #8 * 2*4]
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vldr d12, [a1, #9 * 2*4]
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vldr d11, [a1, #10 * 2*4]
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vldr d13, [a1, #11 * 2*4]
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macro_fft8_tail
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vadd.f s16, s20, s24 @ vector op
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@ FFT4(z+12)
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vldr d4, [a1, #12 * 2*4]
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vldr d6, [a1, #13 * 2*4]
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vldr d5, [a1, #14 * 2*4]
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vsub.f s20, s20, s24 @ vector op
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vldr d7, [a1, #15 * 2*4]
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vadd.f s0, s16, s18
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vsub.f s4, s16, s18
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vadd.f s1, s17, s19
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vsub.f s5, s17, s19
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vadd.f s7, s21, s22
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vsub.f s3, s21, s22
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vadd.f s2, s20, s23
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vsub.f s6, s20, s23
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vadd.f s16, s8, s12 @ vector op
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vstr d0, [a1, #8 * 2*4]
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vstr d2, [a1, #10 * 2*4]
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vstr d1, [a1, #9 * 2*4]
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vsub.f s20, s8, s12
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vstr d3, [a1, #11 * 2*4]
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@ TRANSFORM(z[2],z[6],z[10],z[14],cos1pi4,cos1pi4)
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vldr d12, [a1, #10 * 2*4]
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vadd.f s0, s16, s18
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vadd.f s1, s17, s19
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vsub.f s6, s16, s18
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vsub.f s7, s17, s19
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vsub.f s3, s21, s22
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vadd.f s2, s20, s23
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vadd.f s5, s21, s22
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vsub.f s4, s20, s23
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vstr d0, [a1, #12 * 2*4]
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vmov s0, s6
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@ TRANSFORM(z[1],z[5],z[9],z[13],cos1pi8,cos3pi8)
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vldr d6, [a1, #9 * 2*4]
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vstr d1, [a1, #13 * 2*4]
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vldr d1, cos1pi4 @ s2 = cos1pi4, s3 = cos1pi8
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vstr d2, [a1, #15 * 2*4]
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vldr d7, [a1, #13 * 2*4]
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vadd.f s4, s25, s24
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vsub.f s5, s25, s24
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vsub.f s6, s0, s7
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vadd.f s7, s0, s7
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vmul.f s20, s12, s3 @ vector op
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@ TRANSFORM(z[3],z[7],z[11],z[15],cos3pi8,cos1pi8)
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vldr d4, [a1, #11 * 2*4]
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vldr d5, [a1, #15 * 2*4]
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vldr s1, cos3pi8
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vmul.f s24, s4, s2 @ vector * scalar op
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vmul.f s28, s12, s1 @ vector * scalar op
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vmul.f s12, s8, s1 @ vector * scalar op
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vadd.f s4, s20, s29
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vsub.f s5, s21, s28
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vsub.f s6, s22, s31
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vadd.f s7, s23, s30
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vmul.f s8, s8, s3 @ vector * scalar op
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vldr d8, [a1, #1 * 2*4]
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vldr d9, [a1, #5 * 2*4]
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vldr d10, [a1, #3 * 2*4]
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vldr d11, [a1, #7 * 2*4]
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vldr d14, [a1, #2 * 2*4]
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vadd.f s0, s6, s4
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vadd.f s1, s5, s7
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vsub.f s2, s5, s7
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vsub.f s3, s6, s4
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vadd.f s4, s12, s9
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vsub.f s5, s13, s8
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vsub.f s6, s14, s11
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vadd.f s7, s15, s10
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vadd.f s12, s0, s16 @ vector op
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vstr d0, [a1, #1 * 2*4]
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vstr d1, [a1, #5 * 2*4]
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vldr d4, [a1, #1 * 2*4]
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vldr d5, [a1, #5 * 2*4]
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vadd.f s0, s6, s4
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vadd.f s1, s5, s7
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vsub.f s2, s5, s7
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vsub.f s3, s6, s4
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vsub.f s8, s16, s8 @ vector op
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vstr d6, [a1, #1 * 2*4]
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vstr d7, [a1, #5 * 2*4]
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vldr d15, [a1, #6 * 2*4]
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vsub.f s4, s20, s0
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vsub.f s5, s21, s1
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vsub.f s6, s22, s2
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vsub.f s7, s23, s3
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vadd.f s20, s0, s20 @ vector op
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vstr d4, [a1, #9 * 2*4]
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@ TRANSFORM_ZERO(z[0],z[4],z[8],z[12])
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vldr d6, [a1, #8 * 2*4]
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vstr d5, [a1, #13 * 2*4]
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vldr d7, [a1, #12 * 2*4]
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vstr d2, [a1, #11 * 2*4]
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vldr d8, [a1, #0 * 2*4]
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vstr d3, [a1, #15 * 2*4]
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vldr d9, [a1, #4 * 2*4]
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vadd.f s0, s26, s24
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vadd.f s1, s25, s27
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vsub.f s2, s25, s27
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vsub.f s3, s26, s24
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vadd.f s4, s14, s12
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vadd.f s5, s13, s15
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vsub.f s6, s13, s15
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vsub.f s7, s14, s12
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vadd.f s8, s0, s28 @ vector op
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vstr d0, [a1, #3 * 2*4]
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vstr d1, [a1, #7 * 2*4]
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vldr d6, [a1, #3 * 2*4]
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vldr d7, [a1, #7 * 2*4]
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vsub.f s0, s16, s4
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vsub.f s1, s17, s5
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vsub.f s2, s18, s6
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vsub.f s3, s19, s7
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vsub.f s12, s28, s12 @ vector op
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vadd.f s16, s4, s16 @ vector op
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vstr d10, [a1, #3 * 2*4]
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vstr d11, [a1, #7 * 2*4]
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vstr d4, [a1, #2 * 2*4]
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vstr d5, [a1, #6 * 2*4]
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vstr d0, [a1, #8 * 2*4]
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vstr d1, [a1, #12 * 2*4]
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vstr d6, [a1, #10 * 2*4]
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vstr d7, [a1, #14 * 2*4]
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vstr d8, [a1, #0 * 2*4]
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vstr d9, [a1, #4 * 2*4]
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vpop {s16-s31}
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fmxr FPSCR, a2
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bx lr
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endfunc
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