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442 lines
18 KiB
442 lines
18 KiB
/* |
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* ARM NEON optimised FFT |
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* |
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* Copyright (c) 2009 Mans Rullgard <mans@mansr.com> |
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* Copyright (c) 2009 Naotoshi Nojiri |
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* Copyright (c) 2014 Janne Grunau <janne-libav@jannau.net> |
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* |
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* This algorithm (though not any of the implementation details) is |
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* based on libdjbfft by D. J. Bernstein. |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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/aarch64/asm.S" |
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#define M_SQRT1_2 0.70710678118654752440 |
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.macro transpose d0, d1, s0, s1 |
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trn1 \d0, \s0, \s1 |
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trn2 \d1, \s0, \s1 |
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.endm |
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function fft4_neon |
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ld1 {v0.2s,v1.2s,v2.2s,v3.2s}, [x0] |
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fadd v4.2s, v0.2s, v1.2s // r0+r1,i0+i1 |
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fsub v6.2s, v0.2s, v1.2s // r0-r1,i0-i1 |
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ext v16.8b, v2.8b, v3.8b, #4 |
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ext v17.8b, v3.8b, v2.8b, #4 |
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fadd v5.2s, v2.2s, v3.2s // i2+i3,r2+r3 |
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fsub v7.2s, v16.2s, v17.2s // r3-r2,i2-i3 |
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fadd v0.2s, v4.2s, v5.2s |
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fsub v2.2s, v4.2s, v5.2s |
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fadd v1.2s, v6.2s, v7.2s |
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fsub v3.2s, v6.2s, v7.2s |
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st1 {v0.2s,v1.2s,v2.2s,v3.2s}, [x0] |
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ret |
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endfunc |
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function fft8_neon |
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mov x1, x0 |
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ld1 {v0.2s, v1.2s, v2.2s, v3.2s}, [x0], #32 |
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ld1 {v16.2s,v17.2s,v18.2s,v19.2s}, [x0] |
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ext v22.8b, v2.8b, v3.8b, #4 |
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ext v23.8b, v3.8b, v2.8b, #4 |
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fadd v4.2s, v16.2s, v17.2s // r4+r5,i4+i5 |
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fadd v5.2s, v18.2s, v19.2s // r6+r7,i6+i7 |
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fsub v17.2s, v16.2s, v17.2s // r4-r5,i4-i5 |
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fsub v19.2s, v18.2s, v19.2s // r6-r7,i6-i7 |
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rev64 v27.2s, v28.2s // ??? |
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fadd v20.2s, v0.2s, v1.2s // r0+r1,i0+i1 |
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fadd v21.2s, v2.2s, v3.2s // r2+r3,i2+i3 |
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fmul v26.2s, v17.2s, v28.2s // -a2r*w,a2i*w |
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ext v6.8b, v4.8b, v5.8b, #4 |
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ext v7.8b, v5.8b, v4.8b, #4 |
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fmul v27.2s, v19.2s, v27.2s // a3r*w,-a3i*w |
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fsub v23.2s, v22.2s, v23.2s // i2-i3,r3-r2 |
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fsub v22.2s, v0.2s, v1.2s // r0-r1,i0-i1 |
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fmul v24.2s, v17.2s, v28.s[1] // a2r*w,a2i*w |
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fmul v25.2s, v19.2s, v28.s[1] // a3r*w,a3i*w |
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fadd v0.2s, v20.2s, v21.2s |
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fsub v2.2s, v20.2s, v21.2s |
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fadd v1.2s, v22.2s, v23.2s |
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rev64 v26.2s, v26.2s |
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rev64 v27.2s, v27.2s |
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fsub v3.2s, v22.2s, v23.2s |
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fsub v6.2s, v6.2s, v7.2s |
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fadd v24.2s, v24.2s, v26.2s // a2r+a2i,a2i-a2r t1,t2 |
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fadd v25.2s, v25.2s, v27.2s // a3r-a3i,a3i+a3r t5,t6 |
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fadd v7.2s, v4.2s, v5.2s |
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fsub v18.2s, v2.2s, v6.2s |
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ext v26.8b, v24.8b, v25.8b, #4 |
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ext v27.8b, v25.8b, v24.8b, #4 |
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fadd v2.2s, v2.2s, v6.2s |
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fsub v16.2s, v0.2s, v7.2s |
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fadd v5.2s, v25.2s, v24.2s |
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fsub v4.2s, v26.2s, v27.2s |
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fadd v0.2s, v0.2s, v7.2s |
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fsub v17.2s, v1.2s, v5.2s |
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fsub v19.2s, v3.2s, v4.2s |
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fadd v3.2s, v3.2s, v4.2s |
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fadd v1.2s, v1.2s, v5.2s |
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st1 {v16.2s,v17.2s,v18.2s,v19.2s}, [x0] |
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st1 {v0.2s, v1.2s, v2.2s, v3.2s}, [x1] |
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ret |
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endfunc |
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function fft16_neon |
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mov x1, x0 |
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ld1 {v0.2s, v1.2s, v2.2s, v3.2s}, [x0], #32 |
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ld1 {v16.2s,v17.2s,v18.2s,v19.2s}, [x0], #32 |
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ext v22.8b, v2.8b, v3.8b, #4 |
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ext v23.8b, v3.8b, v2.8b, #4 |
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fadd v4.2s, v16.2s, v17.2s // r4+r5,i4+i5 |
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fadd v5.2s, v18.2s, v19.2s // r6+r7,i6+i7 |
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fsub v17.2s, v16.2s, v17.2s // r4-r5,i4-i5 |
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fsub v19.2s, v18.2s, v19.2s // r6-r7,i6-i7 |
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rev64 v27.2s, v28.2s // ??? |
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fadd v20.2s, v0.2s, v1.2s // r0+r1,i0+i1 |
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fadd v21.2s, v2.2s, v3.2s // r2+r3,i2+i3 |
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fmul v26.2s, v17.2s, v28.2s // -a2r*w,a2i*w |
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ext v6.8b, v4.8b, v5.8b, #4 |
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ext v7.8b, v5.8b, v4.8b, #4 |
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fmul v27.2s, v19.2s, v27.2s // a3r*w,-a3i*w |
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fsub v23.2s, v22.2s, v23.2s // i2-i3,r3-r2 |
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fsub v22.2s, v0.2s, v1.2s // r0-r1,i0-i1 |
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fmul v24.2s, v17.2s, v28.s[1] // a2r*w,a2i*w |
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fmul v25.2s, v19.2s, v28.s[1] // a3r*w,a3i*w |
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fadd v0.2s, v20.2s, v21.2s |
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fsub v2.2s, v20.2s, v21.2s |
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fadd v1.2s, v22.2s, v23.2s |
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rev64 v26.2s, v26.2s |
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rev64 v27.2s, v27.2s |
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fsub v3.2s, v22.2s, v23.2s |
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fsub v6.2s, v6.2s, v7.2s |
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fadd v24.2s, v24.2s, v26.2s // a2r+a2i,a2i-a2r t1,t2 |
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fadd v25.2s, v25.2s, v27.2s // a3r-a3i,a3i+a3r t5,t6 |
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fadd v7.2s, v4.2s, v5.2s |
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fsub v18.2s, v2.2s, v6.2s |
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ld1 {v20.4s,v21.4s}, [x0], #32 |
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ld1 {v22.4s,v23.4s}, [x0], #32 |
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ext v26.8b, v24.8b, v25.8b, #4 |
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ext v27.8b, v25.8b, v24.8b, #4 |
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fadd v2.2s, v2.2s, v6.2s |
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fsub v16.2s, v0.2s, v7.2s |
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fadd v5.2s, v25.2s, v24.2s |
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fsub v4.2s, v26.2s, v27.2s |
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transpose v24.2d, v25.2d, v20.2d, v22.2d |
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transpose v26.2d, v27.2d, v21.2d, v23.2d |
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fadd v0.2s, v0.2s, v7.2s |
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fsub v17.2s, v1.2s, v5.2s |
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fsub v19.2s, v3.2s, v4.2s |
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fadd v3.2s, v3.2s, v4.2s |
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fadd v1.2s, v1.2s, v5.2s |
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ext v20.16b, v21.16b, v21.16b, #4 |
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ext v21.16b, v23.16b, v23.16b, #4 |
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zip1 v0.2d, v0.2d, v1.2d // {z[0], z[1]} |
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zip1 v1.2d, v2.2d, v3.2d // {z[2], z[3]} |
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zip1 v2.2d, v16.2d, v17.2d // {z[o1], z[o1+1]} |
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zip1 v3.2d, v18.2d, v19.2d // {z[o1+2],z[o1+3]} |
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// 2 x fft4 |
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transpose v22.2d, v23.2d, v20.2d, v21.2d |
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fadd v4.4s, v24.4s, v25.4s |
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fadd v5.4s, v26.4s, v27.4s |
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fsub v6.4s, v24.4s, v25.4s |
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fsub v7.4s, v22.4s, v23.4s |
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ld1 {v23.4s}, [x14] |
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fadd v24.4s, v4.4s, v5.4s // {z[o2+0],z[o2+1]} |
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fsub v26.4s, v4.4s, v5.4s // {z[o2+2],z[o2+3]} |
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fadd v25.4s, v6.4s, v7.4s // {z[o3+0],z[o3+1]} |
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fsub v27.4s, v6.4s, v7.4s // {z[o3+2],z[o3+3]} |
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//fft_pass_neon_16 |
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rev64 v7.4s, v25.4s |
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fmul v25.4s, v25.4s, v23.s[1] |
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fmul v7.4s, v7.4s, v29.4s |
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fmla v25.4s, v7.4s, v23.s[3] // {t1a,t2a,t5a,t6a} |
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zip1 v20.4s, v24.4s, v25.4s |
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zip2 v21.4s, v24.4s, v25.4s |
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fneg v22.4s, v20.4s |
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fadd v4.4s, v21.4s, v20.4s |
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fsub v6.4s, v20.4s, v21.4s // just the second half |
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fadd v5.4s, v21.4s, v22.4s // just the first half |
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tbl v4.16b, {v4.16b}, v30.16b // trans4_float |
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tbl v5.16b, {v5.16b,v6.16b}, v31.16b // trans8_float |
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fsub v20.4s, v0.4s, v4.4s // {z[o2],z[o2+1]} |
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fadd v16.4s, v0.4s, v4.4s // {z[0], z[1]} |
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fsub v22.4s, v2.4s, v5.4s // {z[o3],z[o3+1]} |
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fadd v18.4s, v2.4s, v5.4s // {z[o1],z[o1+1]} |
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//second half |
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rev64 v6.4s, v26.4s |
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fmul v26.4s, v26.4s, v23.s[2] |
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rev64 v7.4s, v27.4s |
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fmul v27.4s, v27.4s, v23.s[3] |
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fmul v6.4s, v6.4s, v29.4s |
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fmul v7.4s, v7.4s, v29.4s |
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fmla v26.4s, v6.4s, v23.s[2] // {t1,t2,t5,t6} |
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fmla v27.4s, v7.4s, v23.s[1] // {t1a,t2a,t5a,t6a} |
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zip1 v24.4s, v26.4s, v27.4s |
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zip2 v25.4s, v26.4s, v27.4s |
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fneg v26.4s, v24.4s |
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fadd v4.4s, v25.4s, v24.4s |
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fsub v6.4s, v24.4s, v25.4s // just the second half |
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fadd v5.4s, v25.4s, v26.4s // just the first half |
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tbl v4.16b, {v4.16b}, v30.16b // trans4_float |
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tbl v5.16b, {v5.16b,v6.16b}, v31.16b // trans8_float |
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fadd v17.4s, v1.4s, v4.4s // {z[2], z[3]} |
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fsub v21.4s, v1.4s, v4.4s // {z[o2+2],z[o2+3]} |
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fadd v19.4s, v3.4s, v5.4s // {z[o1+2],z[o1+3]} |
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fsub v23.4s, v3.4s, v5.4s // {z[o3+2],z[o3+3]} |
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st1 {v16.4s,v17.4s}, [x1], #32 |
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st1 {v18.4s,v19.4s}, [x1], #32 |
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st1 {v20.4s,v21.4s}, [x1], #32 |
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st1 {v22.4s,v23.4s}, [x1], #32 |
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ret |
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endfunc |
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const trans4_float, align=4 |
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.byte 0, 1, 2, 3 |
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.byte 8, 9, 10, 11 |
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.byte 4, 5, 6, 7 |
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.byte 12, 13, 14, 15 |
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endconst |
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const trans8_float, align=4 |
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.byte 24, 25, 26, 27 |
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.byte 0, 1, 2, 3 |
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.byte 28, 29, 30, 31 |
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.byte 4, 5, 6, 7 |
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endconst |
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function fft_pass_neon |
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sub x6, x2, #1 // n - 1, loop counter |
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lsl x5, x2, #3 // 2 * n * sizeof FFTSample |
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lsl x1, x2, #4 // 2 * n * sizeof FFTComplex |
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add x5, x4, x5 // wim |
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add x3, x1, x2, lsl #5 // 4 * n * sizeof FFTComplex |
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add x2, x0, x2, lsl #5 // &z[o2] |
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add x3, x0, x3 // &z[o3] |
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add x1, x0, x1 // &z[o1] |
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ld1 {v20.4s},[x2] // {z[o2],z[o2+1]} |
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ld1 {v22.4s},[x3] // {z[o3],z[o3+1]} |
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ld1 {v4.2s}, [x4], #8 // {wre[0],wre[1]} |
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trn2 v25.2d, v20.2d, v22.2d |
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sub x5, x5, #4 // wim-- |
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trn1 v24.2d, v20.2d, v22.2d |
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ld1 {v5.s}[0], [x5], x7 // d5[0] = wim[-1] |
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rev64 v7.4s, v25.4s |
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fmul v25.4s, v25.4s, v4.s[1] |
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ld1 {v16.4s}, [x0] // {z[0],z[1]} |
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fmul v7.4s, v7.4s, v29.4s |
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ld1 {v17.4s}, [x1] // {z[o1],z[o1+1]} |
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prfm pldl1keep, [x2, #16] |
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prfm pldl1keep, [x3, #16] |
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fmla v25.4s, v7.4s, v5.s[0] // {t1a,t2a,t5a,t6a} |
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prfm pldl1keep, [x0, #16] |
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prfm pldl1keep, [x1, #16] |
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zip1 v20.4s, v24.4s, v25.4s |
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zip2 v21.4s, v24.4s, v25.4s |
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fneg v22.4s, v20.4s |
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fadd v4.4s, v21.4s, v20.4s |
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fsub v6.4s, v20.4s, v21.4s // just the second half |
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fadd v5.4s, v21.4s, v22.4s // just the first half |
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tbl v4.16b, {v4.16b}, v30.16b // trans4_float |
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tbl v5.16b, {v5.16b,v6.16b}, v31.16b // trans8_float |
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fadd v20.4s, v16.4s, v4.4s |
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fsub v22.4s, v16.4s, v4.4s |
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fadd v21.4s, v17.4s, v5.4s |
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st1 {v20.4s}, [x0], #16 // {z[0], z[1]} |
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fsub v23.4s, v17.4s, v5.4s |
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st1 {v21.4s}, [x1], #16 // {z[o1],z[o1+1]} |
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st1 {v22.4s}, [x2], #16 // {z[o2],z[o2+1]} |
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st1 {v23.4s}, [x3], #16 // {z[o3],z[o3+1]} |
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1: |
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ld1 {v20.4s},[x2] // {z[o2],z[o2+1]} |
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ld1 {v22.4s},[x3] // {z[o3],z[o3+1]} |
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ld1 {v4.2s}, [x4], #8 // {wre[0],wre[1]} |
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transpose v26.2d, v27.2d, v20.2d, v22.2d |
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ld1 {v5.2s}, [x5], x7 // {wim[-1],wim[0]} |
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rev64 v6.4s, v26.4s |
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fmul v26.4s, v26.4s, v4.s[0] |
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rev64 v7.4s, v27.4s |
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fmul v27.4s, v27.4s, v4.s[1] |
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fmul v6.4s, v6.4s, v29.4s |
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fmul v7.4s, v7.4s, v29.4s |
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ld1 {v16.4s},[x0] // {z[0],z[1]} |
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fmla v26.4s, v6.4s, v5.s[1] // {t1,t2,t5,t6} |
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fmla v27.4s, v7.4s, v5.s[0] // {t1a,t2a,t5a,t6a} |
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ld1 {v17.4s},[x1] // {z[o1],z[o1+1]} |
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subs x6, x6, #1 // n-- |
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zip1 v20.4s, v26.4s, v27.4s |
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zip2 v21.4s, v26.4s, v27.4s |
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fneg v22.4s, v20.4s |
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fadd v4.4s, v21.4s, v20.4s |
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fsub v6.4s, v20.4s, v21.4s // just the second half |
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fadd v5.4s, v21.4s, v22.4s // just the first half |
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tbl v4.16b, {v4.16b}, v30.16b // trans4_float |
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tbl v5.16b, {v5.16b,v6.16b}, v31.16b // trans8_float |
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fadd v20.4s, v16.4s, v4.4s |
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fsub v22.4s, v16.4s, v4.4s |
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fadd v21.4s, v17.4s, v5.4s |
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st1 {v20.4s}, [x0], #16 // {z[0], z[1]} |
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fsub v23.4s, v17.4s, v5.4s |
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st1 {v21.4s}, [x1], #16 // {z[o1],z[o1+1]} |
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st1 {v22.4s}, [x2], #16 // {z[o2],z[o2+1]} |
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st1 {v23.4s}, [x3], #16 // {z[o3],z[o3+1]} |
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b.ne 1b |
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ret |
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endfunc |
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.macro def_fft n, n2, n4 |
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function fft\n\()_neon align=6 |
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sub sp, sp, #16 |
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stp x28, x30, [sp] |
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add x28, x0, #\n4*2*8 |
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bl fft\n2\()_neon |
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mov x0, x28 |
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bl fft\n4\()_neon |
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add x0, x28, #\n4*1*8 |
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bl fft\n4\()_neon |
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sub x0, x28, #\n4*2*8 |
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ldp x28, x30, [sp], #16 |
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movrel x4, X(ff_cos_\n) |
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mov x2, #\n4>>1 |
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b fft_pass_neon |
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endfunc |
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.endm |
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def_fft 32, 16, 8 |
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def_fft 64, 32, 16 |
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def_fft 128, 64, 32 |
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def_fft 256, 128, 64 |
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def_fft 512, 256, 128 |
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def_fft 1024, 512, 256 |
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def_fft 2048, 1024, 512 |
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def_fft 4096, 2048, 1024 |
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def_fft 8192, 4096, 2048 |
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def_fft 16384, 8192, 4096 |
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def_fft 32768, 16384, 8192 |
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def_fft 65536, 32768, 16384 |
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function ff_fft_calc_neon, export=1 |
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prfm pldl1keep, [x1] |
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movrel x10, trans4_float |
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ldr w2, [x0] |
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movrel x11, trans8_float |
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sub w2, w2, #2 |
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movrel x3, fft_tab_neon |
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ld1 {v30.16b}, [x10] |
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mov x7, #-8 |
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movrel x12, pmmp |
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ldr x3, [x3, x2, lsl #3] |
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movrel x13, mppm |
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movrel x14, X(ff_cos_16) |
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ld1 {v31.16b}, [x11] |
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mov x0, x1 |
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ld1 {v29.4s}, [x12] // pmmp |
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ld1 {v28.4s}, [x13] |
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br x3 |
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endfunc |
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function ff_fft_permute_neon, export=1 |
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mov x6, #1 |
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ldr w2, [x0] // nbits |
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ldr x3, [x0, #16] // tmp_buf |
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ldr x0, [x0, #8] // revtab |
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lsl x6, x6, x2 |
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mov x2, x6 |
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1: |
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ld1 {v0.2s,v1.2s}, [x1], #16 |
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ldr w4, [x0], #4 |
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uxth w5, w4 |
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lsr w4, w4, #16 |
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add x5, x3, x5, lsl #3 |
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add x4, x3, x4, lsl #3 |
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st1 {v0.2s}, [x5] |
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st1 {v1.2s}, [x4] |
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subs x6, x6, #2 |
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b.gt 1b |
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sub x1, x1, x2, lsl #3 |
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1: |
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ld1 {v0.4s,v1.4s}, [x3], #32 |
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st1 {v0.4s,v1.4s}, [x1], #32 |
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subs x2, x2, #4 |
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b.gt 1b |
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ret |
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endfunc |
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const fft_tab_neon |
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.quad fft4_neon |
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.quad fft8_neon |
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.quad fft16_neon |
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.quad fft32_neon |
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.quad fft64_neon |
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.quad fft128_neon |
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.quad fft256_neon |
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.quad fft512_neon |
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.quad fft1024_neon |
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.quad fft2048_neon |
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.quad fft4096_neon |
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.quad fft8192_neon |
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.quad fft16384_neon |
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.quad fft32768_neon |
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.quad fft65536_neon |
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endconst |
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const pmmp, align=4 |
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.float +1.0, -1.0, -1.0, +1.0 |
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endconst |
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const mppm, align=4 |
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.float -M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, -M_SQRT1_2 |
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endconst
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