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- /*
- * Copyright (c) 2013 RISC OS Open Ltd
- * Author: Ben Avison <bavison@riscosopen.org>
- *
- * This file is part of Libav.
- *
- * Libav 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.
- *
- * Libav 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 Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
- #include "libavutil/arm/asm.S"
-
- @ TODO: * FFTs wider than 16
- @ * dispatch code
-
- function fft4_vfp
- vldr d0, [a1, #0*2*4] @ s0,s1 = z[0]
- vldr d4, [a1, #1*2*4] @ s8,s9 = z[1]
- vldr d1, [a1, #2*2*4] @ s2,s3 = z[2]
- vldr d5, [a1, #3*2*4] @ s10,s11 = z[3]
- @ stall
- vadd.f s12, s0, s8 @ i0
- vadd.f s13, s1, s9 @ i1
- vadd.f s14, s2, s10 @ i2
- vadd.f s15, s3, s11 @ i3
- vsub.f s8, s0, s8 @ i4
- vsub.f s9, s1, s9 @ i5
- vsub.f s10, s2, s10 @ i6
- vsub.f s11, s3, s11 @ i7
- @ stall
- @ stall
- vadd.f s0, s12, s14 @ z[0].re
- vsub.f s4, s12, s14 @ z[2].re
- vadd.f s1, s13, s15 @ z[0].im
- vsub.f s5, s13, s15 @ z[2].im
- vadd.f s7, s9, s10 @ z[3].im
- vsub.f s3, s9, s10 @ z[1].im
- vadd.f s2, s8, s11 @ z[1].re
- vsub.f s6, s8, s11 @ z[3].re
- @ stall
- @ stall
- vstr d0, [a1, #0*2*4]
- vstr d2, [a1, #2*2*4]
- @ stall
- @ stall
- vstr d1, [a1, #1*2*4]
- vstr d3, [a1, #3*2*4]
-
- bx lr
- endfunc
-
- .macro macro_fft8_head
- @ FFT4
- vldr d4, [a1, #0 * 2*4]
- vldr d6, [a1, #1 * 2*4]
- vldr d5, [a1, #2 * 2*4]
- vldr d7, [a1, #3 * 2*4]
- @ BF
- vldr d12, [a1, #4 * 2*4]
- vadd.f s16, s8, s12 @ vector op
- vldr d14, [a1, #5 * 2*4]
- vldr d13, [a1, #6 * 2*4]
- vldr d15, [a1, #7 * 2*4]
- vsub.f s20, s8, s12 @ vector op
- vadd.f s0, s16, s18
- vsub.f s2, s16, s18
- vadd.f s1, s17, s19
- vsub.f s3, s17, s19
- vadd.f s7, s21, s22
- vsub.f s5, s21, s22
- vadd.f s4, s20, s23
- vsub.f s6, s20, s23
- vsub.f s20, s24, s28 @ vector op
- vstr d0, [a1, #0 * 2*4] @ transfer s0-s7 to s24-s31 via memory
- vstr d1, [a1, #1 * 2*4]
- vldr s0, cos1pi4
- vadd.f s16, s24, s28 @ vector op
- vstr d2, [a1, #2 * 2*4]
- vstr d3, [a1, #3 * 2*4]
- vldr d12, [a1, #0 * 2*4]
- @ TRANSFORM
- vmul.f s20, s20, s0 @ vector x scalar op
- vldr d13, [a1, #1 * 2*4]
- vldr d14, [a1, #2 * 2*4]
- vldr d15, [a1, #3 * 2*4]
- @ BUTTERFLIES
- vadd.f s0, s18, s16
- vadd.f s1, s17, s19
- vsub.f s2, s17, s19
- vsub.f s3, s18, s16
- vadd.f s4, s21, s20
- vsub.f s5, s21, s20
- vadd.f s6, s22, s23
- vsub.f s7, s22, s23
- vadd.f s8, s0, s24 @ vector op
- vstr d0, [a1, #0 * 2*4] @ transfer s0-s3 to s12-s15 via memory
- vstr d1, [a1, #1 * 2*4]
- vldr d6, [a1, #0 * 2*4]
- vldr d7, [a1, #1 * 2*4]
- vadd.f s1, s5, s6
- vadd.f s0, s7, s4
- vsub.f s2, s5, s6
- vsub.f s3, s7, s4
- vsub.f s12, s24, s12 @ vector op
- vsub.f s5, s29, s1
- vsub.f s4, s28, s0
- vsub.f s6, s30, s2
- vsub.f s7, s31, s3
- vadd.f s16, s0, s28 @ vector op
- vstr d6, [a1, #4 * 2*4]
- vstr d7, [a1, #6 * 2*4]
- vstr d4, [a1, #0 * 2*4]
- vstr d5, [a1, #2 * 2*4]
- vstr d2, [a1, #5 * 2*4]
- vstr d3, [a1, #7 * 2*4]
- .endm
-
- .macro macro_fft8_tail
- vstr d8, [a1, #1 * 2*4]
- vstr d9, [a1, #3 * 2*4]
- .endm
-
- function fft8_vfp
- ldr a3, =0x03030000 @ RunFast mode, vector length 4, stride 1
- fmrx a2, FPSCR
- fmxr FPSCR, a3
- vpush {s16-s31}
-
- macro_fft8_head
- macro_fft8_tail
-
- vpop {s16-s31}
- fmxr FPSCR, a2
- bx lr
- endfunc
-
- .align 3
- cos1pi4: @ cos(1*pi/4) = sqrt(2)
- .float 0.707106769084930419921875
- cos1pi8: @ cos(1*pi/8) = sqrt(2+sqrt(2))/2
- .float 0.92387950420379638671875
- cos3pi8: @ cos(2*pi/8) = sqrt(2-sqrt(2))/2
- .float 0.3826834261417388916015625
-
- function ff_fft16_vfp, export=1
- ldr a3, =0x03030000 @ RunFast mode, vector length 4, stride 1
- fmrx a2, FPSCR
- fmxr FPSCR, a3
- vpush {s16-s31}
-
- macro_fft8_head
- @ FFT4(z+8)
- vldr d10, [a1, #8 * 2*4]
- vldr d12, [a1, #9 * 2*4]
- vldr d11, [a1, #10 * 2*4]
- vldr d13, [a1, #11 * 2*4]
- macro_fft8_tail
- vadd.f s16, s20, s24 @ vector op
- @ FFT4(z+12)
- vldr d4, [a1, #12 * 2*4]
- vldr d6, [a1, #13 * 2*4]
- vldr d5, [a1, #14 * 2*4]
- vsub.f s20, s20, s24 @ vector op
- vldr d7, [a1, #15 * 2*4]
- vadd.f s0, s16, s18
- vsub.f s4, s16, s18
- vadd.f s1, s17, s19
- vsub.f s5, s17, s19
- vadd.f s7, s21, s22
- vsub.f s3, s21, s22
- vadd.f s2, s20, s23
- vsub.f s6, s20, s23
- vadd.f s16, s8, s12 @ vector op
- vstr d0, [a1, #8 * 2*4]
- vstr d2, [a1, #10 * 2*4]
- vstr d1, [a1, #9 * 2*4]
- vsub.f s20, s8, s12
- vstr d3, [a1, #11 * 2*4]
- @ TRANSFORM(z[2],z[6],z[10],z[14],cos1pi4,cos1pi4)
- vldr d12, [a1, #10 * 2*4]
- vadd.f s0, s16, s18
- vadd.f s1, s17, s19
- vsub.f s6, s16, s18
- vsub.f s7, s17, s19
- vsub.f s3, s21, s22
- vadd.f s2, s20, s23
- vadd.f s5, s21, s22
- vsub.f s4, s20, s23
- vstr d0, [a1, #12 * 2*4]
- vmov s0, s6
- @ TRANSFORM(z[1],z[5],z[9],z[13],cos1pi8,cos3pi8)
- vldr d6, [a1, #9 * 2*4]
- vstr d1, [a1, #13 * 2*4]
- vldr d1, cos1pi4 @ s2 = cos1pi4, s3 = cos1pi8
- vstr d2, [a1, #15 * 2*4]
- vldr d7, [a1, #13 * 2*4]
- vadd.f s4, s25, s24
- vsub.f s5, s25, s24
- vsub.f s6, s0, s7
- vadd.f s7, s0, s7
- vmul.f s20, s12, s3 @ vector op
- @ TRANSFORM(z[3],z[7],z[11],z[15],cos3pi8,cos1pi8)
- vldr d4, [a1, #11 * 2*4]
- vldr d5, [a1, #15 * 2*4]
- vldr s1, cos3pi8
- vmul.f s24, s4, s2 @ vector * scalar op
- vmul.f s28, s12, s1 @ vector * scalar op
- vmul.f s12, s8, s1 @ vector * scalar op
- vadd.f s4, s20, s29
- vsub.f s5, s21, s28
- vsub.f s6, s22, s31
- vadd.f s7, s23, s30
- vmul.f s8, s8, s3 @ vector * scalar op
- vldr d8, [a1, #1 * 2*4]
- vldr d9, [a1, #5 * 2*4]
- vldr d10, [a1, #3 * 2*4]
- vldr d11, [a1, #7 * 2*4]
- vldr d14, [a1, #2 * 2*4]
- vadd.f s0, s6, s4
- vadd.f s1, s5, s7
- vsub.f s2, s5, s7
- vsub.f s3, s6, s4
- vadd.f s4, s12, s9
- vsub.f s5, s13, s8
- vsub.f s6, s14, s11
- vadd.f s7, s15, s10
- vadd.f s12, s0, s16 @ vector op
- vstr d0, [a1, #1 * 2*4]
- vstr d1, [a1, #5 * 2*4]
- vldr d4, [a1, #1 * 2*4]
- vldr d5, [a1, #5 * 2*4]
- vadd.f s0, s6, s4
- vadd.f s1, s5, s7
- vsub.f s2, s5, s7
- vsub.f s3, s6, s4
- vsub.f s8, s16, s8 @ vector op
- vstr d6, [a1, #1 * 2*4]
- vstr d7, [a1, #5 * 2*4]
- vldr d15, [a1, #6 * 2*4]
- vsub.f s4, s20, s0
- vsub.f s5, s21, s1
- vsub.f s6, s22, s2
- vsub.f s7, s23, s3
- vadd.f s20, s0, s20 @ vector op
- vstr d4, [a1, #9 * 2*4]
- @ TRANSFORM_ZERO(z[0],z[4],z[8],z[12])
- vldr d6, [a1, #8 * 2*4]
- vstr d5, [a1, #13 * 2*4]
- vldr d7, [a1, #12 * 2*4]
- vstr d2, [a1, #11 * 2*4]
- vldr d8, [a1, #0 * 2*4]
- vstr d3, [a1, #15 * 2*4]
- vldr d9, [a1, #4 * 2*4]
- vadd.f s0, s26, s24
- vadd.f s1, s25, s27
- vsub.f s2, s25, s27
- vsub.f s3, s26, s24
- vadd.f s4, s14, s12
- vadd.f s5, s13, s15
- vsub.f s6, s13, s15
- vsub.f s7, s14, s12
- vadd.f s8, s0, s28 @ vector op
- vstr d0, [a1, #3 * 2*4]
- vstr d1, [a1, #7 * 2*4]
- vldr d6, [a1, #3 * 2*4]
- vldr d7, [a1, #7 * 2*4]
- vsub.f s0, s16, s4
- vsub.f s1, s17, s5
- vsub.f s2, s18, s6
- vsub.f s3, s19, s7
- vsub.f s12, s28, s12 @ vector op
- vadd.f s16, s4, s16 @ vector op
- vstr d10, [a1, #3 * 2*4]
- vstr d11, [a1, #7 * 2*4]
- vstr d4, [a1, #2 * 2*4]
- vstr d5, [a1, #6 * 2*4]
- vstr d0, [a1, #8 * 2*4]
- vstr d1, [a1, #12 * 2*4]
- vstr d6, [a1, #10 * 2*4]
- vstr d7, [a1, #14 * 2*4]
- vstr d8, [a1, #0 * 2*4]
- vstr d9, [a1, #4 * 2*4]
-
- vpop {s16-s31}
- fmxr FPSCR, a2
- bx lr
- endfunc
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