fft_fixed_neon.S 9.38 KB
Newer Older
Mans Rullgard's avatar
Mans Rullgard committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
/*
 * Copyright (c) 2011 Mans Rullgard <mans@mansr.com>
 *
 * 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 "asm.S"

.macro  bflies          d0,  d1,  r0,  r1
        vrev64.32       \r0, \d1                @ t5, t6, t1, t2
        vhsub.s16       \r1, \d1, \r0           @ t1-t5, t2-t6, t5-t1, t6-t2
        vhadd.s16       \r0, \d1, \r0           @ t1+t5, t2+t6, t5+t1, t6+t2
        vext.16         \r1, \r1, \r1, #1       @ t2-t6, t5-t1, t6-t2, t1-t5
        vtrn.32         \r0, \r1                @ t1+t5, t2+t6, t2-t6, t5-t1
                                                @ t5,    t6,    t4,    t3
        vhsub.s16       \d1, \d0, \r0
        vhadd.s16       \d0, \d0, \r0
.endm

.macro  transform01     q0,  q1,  d3,  c0,  c1,  r0,  w0,  w1
        vrev32.16       \r0, \d3
        vmull.s16       \w0, \d3, \c0
        vmlal.s16       \w0, \r0, \c1
        vshrn.s32       \d3, \w0, #15
        bflies          \q0, \q1, \w0, \w1
.endm

.macro  transform2      d0,  d1,  d2,  d3,  q0,  q1,  c0,  c1,  c2,  c3, \
                        r0,  r1,  w0,  w1
        vrev32.16       \r0, \d1
        vrev32.16       \r1, \d3
        vmull.s16       \w0, \d1, \c0
        vmlal.s16       \w0, \r0, \c1
        vmull.s16       \w1, \d3, \c2
        vmlal.s16       \w1, \r1, \c3
        vshrn.s32       \d1, \w0, #15
        vshrn.s32       \d3, \w1, #15
        bflies          \q0, \q1, \w0, \w1
.endm

.macro  fft4            d0,  d1,  r0,  r1
        vhsub.s16       \r0, \d0, \d1           @ t3, t4, t8, t7
        vhsub.s16       \r1, \d1, \d0
        vhadd.s16       \d0, \d0, \d1           @ t1, t2, t6, t5
        vmov.i64        \d1, #0xffff<<32
        vbit            \r0, \r1, \d1
        vrev64.16       \r1, \r0                @ t7, t8, t4, t3
        vtrn.32         \r0, \r1                @ t3, t4, t7, t8
        vtrn.32         \d0, \r0                @ t1, t2, t3, t4, t6, t5, t8, t7
        vhsub.s16       \d1, \d0, \r0           @ r2, i2, r3, i1
        vhadd.s16       \d0, \d0, \r0           @ r0, i0, r1, i3
.endm

.macro  fft8            d0,  d1,  d2,  d3,  q0,  q1,  c0,  c1,  r0,  r1, w0, w1
        fft4            \d0, \d1, \r0, \r1
        vtrn.32         \d0, \d1                @ z0, z2, z1, z3
        vhadd.s16       \r0, \d2, \d3           @ t1, t2, t3, t4
        vhsub.s16       \d3, \d2, \d3           @ z5, z7
        vmov            \d2, \r0
        transform01     \q0, \q1, \d3, \c0, \c1, \r0, \w0, \w1
.endm

function fft4_neon
78
        vld1.16         {d0-d1},  [r0]
Mans Rullgard's avatar
Mans Rullgard committed
79
        fft4            d0,  d1,  d2,  d3
80
        vst1.16         {d0-d1},  [r0]
Mans Rullgard's avatar
Mans Rullgard committed
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261
        bx              lr
endfunc

function fft8_neon
        vld1.16         {d0-d3},  [r0,:128]
        movrel          r1,  coefs
        vld1.16         {d30},    [r1,:64]
        vdup.16         d31, d30[0]
        fft8            d0,  d1,  d2,  d3,  q0,  q1,  d31, d30, d20, d21, q8, q9
        vtrn.32         d0,  d1
        vtrn.32         d2,  d3
        vst1.16         {d0-d3},  [r0,:128]
        bx              lr
endfunc

function fft16_neon
        vld1.16         {d0-d3},  [r0,:128]!
        vld1.16         {d4-d7},  [r0,:128]
        movrel          r1,  coefs
        sub             r0,  r0,  #32
        vld1.16         {d28-d31},[r1,:128]
        vdup.16         d31, d28[0]
        fft8            d0,  d1,  d2,  d3,  q0,  q1,  d31, d28, d20, d21, q8, q9
        vswp            d5,  d6
        fft4            q2,  q3,  q8,  q9
        vswp            d5,  d6
        vtrn.32         q0,  q1             @ z0, z4, z2, z6, z1, z5, z3, z7
        vtrn.32         q2,  q3             @ z8, z12,z10,z14,z9, z13,z11,z15
        vswp            d1,  d2
        vdup.16         d31, d28[0]
        transform01     q0,  q2,  d5,  d31, d28, d20, q8, q9
        vdup.16         d26, d29[0]
        vdup.16         d27, d30[0]
        transform2      d2,  d6,  d3,  d7,  q1,  q3,  d26, d30, d27, d29, \
                        d20, d21, q8,  q9
        vtrn.32         q0,  q1
        vtrn.32         q2,  q3
        vst1.16         {d0-d3},  [r0,:128]!
        vst1.16         {d4-d7},  [r0,:128]
        bx              lr
endfunc

function fft_pass_neon
        push            {r4,lr}
        movrel          lr,  coefs + 24
        vld1.16         {d30},    [lr,:64]
        lsl             r12, r2,  #3
        vmov            d31, d30
        add             r3,  r1,  r2,  lsl #2
        mov             lr,  #-8
        sub             r3,  r3,  #2
        mov             r4,  r0
        vld1.16         {d27[]},  [r3,:16]
        sub             r3,  r3,  #6
        vld1.16         {q0},     [r4,:128], r12
        vld1.16         {q1},     [r4,:128], r12
        vld1.16         {q2},     [r4,:128], r12
        vld1.16         {q3},     [r4,:128], r12
        vld1.16         {d28},    [r1,:64]!
        vld1.16         {d29},    [r3,:64], lr
        vswp            d1,  d2
        vswp            d5,  d6
        vtrn.32         d0,  d1
        vtrn.32         d4,  d5
        vdup.16         d25, d28[1]
        vmul.s16        d27, d27, d31
        transform01     q0,  q2,  d5,  d25, d27, d20, q8,  q9
        b               2f
1:
        mov             r4,  r0
        vdup.16         d26, d29[0]
        vld1.16         {q0},     [r4,:128], r12
        vld1.16         {q1},     [r4,:128], r12
        vld1.16         {q2},     [r4,:128], r12
        vld1.16         {q3},     [r4,:128], r12
        vld1.16         {d28},    [r1,:64]!
        vld1.16         {d29},    [r3,:64], lr
        vswp            d1,  d2
        vswp            d5,  d6
        vtrn.32         d0,  d1
        vtrn.32         d4,  d5
        vdup.16         d24, d28[0]
        vdup.16         d25, d28[1]
        vdup.16         d27, d29[3]
        vmul.s16        q13, q13, q15
        transform2      d0,  d4,  d1,  d5,  q0,  q2,  d24, d26, d25, d27, \
                        d16, d17, q9,  q10
2:
        vtrn.32         d2,  d3
        vtrn.32         d6,  d7
        vdup.16         d24, d28[2]
        vdup.16         d26, d29[2]
        vdup.16         d25, d28[3]
        vdup.16         d27, d29[1]
        vmul.s16        q13, q13, q15
        transform2      d2,  d6,  d3,  d7,  q1,  q3,  d24, d26, d25, d27, \
                        d16, d17, q9,  q10
        vtrn.32         d0,  d1
        vtrn.32         d2,  d3
        vtrn.32         d4,  d5
        vtrn.32         d6,  d7
        vswp            d1,  d2
        vswp            d5,  d6
        mov             r4,  r0
        vst1.16         {q0},     [r4,:128], r12
        vst1.16         {q1},     [r4,:128], r12
        vst1.16         {q2},     [r4,:128], r12
        vst1.16         {q3},     [r4,:128], r12
        add             r0,  r0,  #16
        subs            r2,  r2,  #2
        bgt             1b
        pop             {r4,pc}
endfunc

#define F_SQRT1_2   23170
#define F_COS_16_1  30274
#define F_COS_16_3  12540

const   coefs, align=4
        .short          F_SQRT1_2, -F_SQRT1_2, -F_SQRT1_2,  F_SQRT1_2
        .short          F_COS_16_1,-F_COS_16_1,-F_COS_16_1, F_COS_16_1
        .short          F_COS_16_3,-F_COS_16_3,-F_COS_16_3, F_COS_16_3
        .short          1,         -1,         -1,          1
endconst

.macro  def_fft n, n2, n4
function fft\n\()_neon
        push            {r4, lr}
        mov             r4,  r0
        bl              fft\n2\()_neon
        add             r0,  r4,  #\n4*2*4
        bl              fft\n4\()_neon
        add             r0,  r4,  #\n4*3*4
        bl              fft\n4\()_neon
        mov             r0,  r4
        pop             {r4, lr}
        movrel          r1,  X(ff_cos_\n\()_fixed)
        mov             r2,  #\n4/2
        b               fft_pass_neon
endfunc
.endm

        def_fft    32,    16,     8
        def_fft    64,    32,    16
        def_fft   128,    64,    32
        def_fft   256,   128,    64
        def_fft   512,   256,   128
        def_fft  1024,   512,   256
        def_fft  2048,  1024,   512
        def_fft  4096,  2048,  1024
        def_fft  8192,  4096,  2048
        def_fft 16384,  8192,  4096
        def_fft 32768, 16384,  8192
        def_fft 65536, 32768, 16384

function ff_fft_fixed_calc_neon, export=1
        ldr             r2,  [r0]
        sub             r2,  r2,  #2
        movrel          r3,  fft_fixed_tab_neon
        ldr             r3,  [r3, r2, lsl #2]
        mov             r0,  r1
        bx              r3
endfunc

const   fft_fixed_tab_neon
        .word fft4_neon
        .word fft8_neon
        .word fft16_neon
        .word fft32_neon
        .word fft64_neon
        .word fft128_neon
        .word fft256_neon
        .word fft512_neon
        .word fft1024_neon
        .word fft2048_neon
        .word fft4096_neon
        .word fft8192_neon
        .word fft16384_neon
        .word fft32768_neon
        .word fft65536_neon
endconst