repositories / deb_ffmpeg.git / blame
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|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * Copyright (c) 2013 RISC OS Open Ltd <bavison@riscosopen.org> | |
| 3 | * | |
| 4 | * This file is part of FFmpeg. | |
| 5 | * | |
| 6 | * FFmpeg is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU Lesser General Public | |
| 8 | * License as published by the Free Software Foundation; either | |
| 9 | * version 2.1 of the License, or (at your option) any later version. | |
| 10 | * | |
| 11 | * FFmpeg is distributed in the hope that it will be useful, | |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | * Lesser General Public License for more details. | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU Lesser General Public | |
| 17 | * License along with FFmpeg; if not, write to the Free Software | |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 19 | */ | |
| 20 | ||
| 21 | #include "config.h" | |
| 22 | #include "libavutil/arm/asm.S" | |
| 23 | ||
| 24 | /** | |
| 25 | * ARM VFP optimised int32 to float conversion. | |
| 26 | * Assume len is a multiple of 8, destination buffer is at least 4 bytes aligned | |
| 27 | * (16 bytes alignment is best for BCM2835), little-endian. | |
| 28 | */ | |
| 29 | @ void ff_int32_to_float_fmul_array8_vfp(FmtConvertContext *c, float *dst, const int32_t *src, const float *mul, int len) | |
| 30 | function ff_int32_to_float_fmul_array8_vfp, export=1 | |
| 31 | push {lr} | |
| 32 | ldr a1, [sp, #4] | |
| 33 | subs lr, a1, #3*8 | |
| 34 | bcc 50f @ too short to pipeline | |
| 35 | @ Now need to find (len / 8) % 3. The approximation | |
| 36 | @ x / 24 = (x * 0xAB) >> 12 | |
| 37 | @ is good for x < 4096, which is true for both AC3 and DCA. | |
| 38 | mov a1, #0xAB | |
| 39 | ldr ip, =0x03070000 @ RunFast mode, short vectors of length 8, stride 1 | |
| 40 | mul a1, lr, a1 | |
| 41 | vpush {s16-s31} | |
| 42 | mov a1, a1, lsr #12 | |
| 43 | add a1, a1, a1, lsl #1 | |
| 44 | rsb a1, a1, lr, lsr #3 | |
| 45 | cmp a1, #1 | |
| 46 | fmrx a1, FPSCR | |
| 47 | fmxr FPSCR, ip | |
| 48 | beq 11f | |
| 49 | blo 10f | |
| 50 | @ Array is (2 + multiple of 3) x 8 floats long | |
| 51 | @ drop through... | |
| 52 | vldmia a3!, {s16-s23} | |
| 53 | vldmia a4!, {s2,s3} | |
| 54 | vldmia a3!, {s24-s31} | |
| 55 | vcvt.f32.s32 s16, s16 | |
| 56 | vcvt.f32.s32 s17, s17 | |
| 57 | vcvt.f32.s32 s18, s18 | |
| 58 | vcvt.f32.s32 s19, s19 | |
| 59 | vcvt.f32.s32 s20, s20 | |
| 60 | vcvt.f32.s32 s21, s21 | |
| 61 | vcvt.f32.s32 s22, s22 | |
| 62 | vcvt.f32.s32 s23, s23 | |
| 63 | vmul.f32 s16, s16, s2 | |
| 64 | @ drop through... | |
| 65 | 3: | |
| 66 | vldmia a3!, {s8-s15} | |
| 67 | vldmia a4!, {s1} | |
| 68 | vcvt.f32.s32 s24, s24 | |
| 69 | vcvt.f32.s32 s25, s25 | |
| 70 | vcvt.f32.s32 s26, s26 | |
| 71 | vcvt.f32.s32 s27, s27 | |
| 72 | vcvt.f32.s32 s28, s28 | |
| 73 | vcvt.f32.s32 s29, s29 | |
| 74 | vcvt.f32.s32 s30, s30 | |
| 75 | vcvt.f32.s32 s31, s31 | |
| 76 | vmul.f32 s24, s24, s3 | |
| 77 | vstmia a2!, {s16-s19} | |
| 78 | vstmia a2!, {s20-s23} | |
| 79 | 2: | |
| 80 | vldmia a3!, {s16-s23} | |
| 81 | vldmia a4!, {s2} | |
| 82 | vcvt.f32.s32 s8, s8 | |
| 83 | vcvt.f32.s32 s9, s9 | |
| 84 | vcvt.f32.s32 s10, s10 | |
| 85 | vcvt.f32.s32 s11, s11 | |
| 86 | vcvt.f32.s32 s12, s12 | |
| 87 | vcvt.f32.s32 s13, s13 | |
| 88 | vcvt.f32.s32 s14, s14 | |
| 89 | vcvt.f32.s32 s15, s15 | |
| 90 | vmul.f32 s8, s8, s1 | |
| 91 | vstmia a2!, {s24-s27} | |
| 92 | vstmia a2!, {s28-s31} | |
| 93 | 1: | |
| 94 | vldmia a3!, {s24-s31} | |
| 95 | vldmia a4!, {s3} | |
| 96 | vcvt.f32.s32 s16, s16 | |
| 97 | vcvt.f32.s32 s17, s17 | |
| 98 | vcvt.f32.s32 s18, s18 | |
| 99 | vcvt.f32.s32 s19, s19 | |
| 100 | vcvt.f32.s32 s20, s20 | |
| 101 | vcvt.f32.s32 s21, s21 | |
| 102 | vcvt.f32.s32 s22, s22 | |
| 103 | vcvt.f32.s32 s23, s23 | |
| 104 | vmul.f32 s16, s16, s2 | |
| 105 | vstmia a2!, {s8-s11} | |
| 106 | vstmia a2!, {s12-s15} | |
| 107 | ||
| 108 | subs lr, lr, #8*3 | |
| 109 | bpl 3b | |
| 110 | ||
| 111 | vcvt.f32.s32 s24, s24 | |
| 112 | vcvt.f32.s32 s25, s25 | |
| 113 | vcvt.f32.s32 s26, s26 | |
| 114 | vcvt.f32.s32 s27, s27 | |
| 115 | vcvt.f32.s32 s28, s28 | |
| 116 | vcvt.f32.s32 s29, s29 | |
| 117 | vcvt.f32.s32 s30, s30 | |
| 118 | vcvt.f32.s32 s31, s31 | |
| 119 | vmul.f32 s24, s24, s3 | |
| 120 | vstmia a2!, {s16-s19} | |
| 121 | vstmia a2!, {s20-s23} | |
| 122 | vstmia a2!, {s24-s27} | |
| 123 | vstmia a2!, {s28-s31} | |
| 124 | ||
| 125 | fmxr FPSCR, a1 | |
| 126 | vpop {s16-s31} | |
| 127 | pop {pc} | |
| 128 | ||
| 129 | 10: @ Array is (multiple of 3) x 8 floats long | |
| 130 | vldmia a3!, {s8-s15} | |
| 131 | vldmia a4!, {s1,s2} | |
| 132 | vldmia a3!, {s16-s23} | |
| 133 | vcvt.f32.s32 s8, s8 | |
| 134 | vcvt.f32.s32 s9, s9 | |
| 135 | vcvt.f32.s32 s10, s10 | |
| 136 | vcvt.f32.s32 s11, s11 | |
| 137 | vcvt.f32.s32 s12, s12 | |
| 138 | vcvt.f32.s32 s13, s13 | |
| 139 | vcvt.f32.s32 s14, s14 | |
| 140 | vcvt.f32.s32 s15, s15 | |
| 141 | vmul.f32 s8, s8, s1 | |
| 142 | b 1b | |
| 143 | ||
| 144 | 11: @ Array is (1 + multiple of 3) x 8 floats long | |
| 145 | vldmia a3!, {s24-s31} | |
| 146 | vldmia a4!, {s3} | |
| 147 | vldmia a3!, {s8-s15} | |
| 148 | vldmia a4!, {s1} | |
| 149 | vcvt.f32.s32 s24, s24 | |
| 150 | vcvt.f32.s32 s25, s25 | |
| 151 | vcvt.f32.s32 s26, s26 | |
| 152 | vcvt.f32.s32 s27, s27 | |
| 153 | vcvt.f32.s32 s28, s28 | |
| 154 | vcvt.f32.s32 s29, s29 | |
| 155 | vcvt.f32.s32 s30, s30 | |
| 156 | vcvt.f32.s32 s31, s31 | |
| 157 | vmul.f32 s24, s24, s3 | |
| 158 | b 2b | |
| 159 | ||
| 160 | 50: | |
| 161 | ldr lr, =0x03070000 @ RunFast mode, short vectors of length 8, stride 1 | |
| 162 | fmrx ip, FPSCR | |
| 163 | fmxr FPSCR, lr | |
| 164 | 51: | |
| 165 | vldmia a3!, {s8-s15} | |
| 166 | vldmia a4!, {s0} | |
| 167 | vcvt.f32.s32 s8, s8 | |
| 168 | vcvt.f32.s32 s9, s9 | |
| 169 | vcvt.f32.s32 s10, s10 | |
| 170 | vcvt.f32.s32 s11, s11 | |
| 171 | vcvt.f32.s32 s12, s12 | |
| 172 | vcvt.f32.s32 s13, s13 | |
| 173 | vcvt.f32.s32 s14, s14 | |
| 174 | vcvt.f32.s32 s15, s15 | |
| 175 | vmul.f32 s8, s8, s0 | |
| 176 | subs a1, a1, #8 | |
| 177 | vstmia a2!, {s8-s11} | |
| 178 | vstmia a2!, {s12-s15} | |
| 179 | bne 51b | |
| 180 | ||
| 181 | fmxr FPSCR, ip | |
| 182 | pop {pc} | |
| 183 | endfunc | |
| 184 | ||
| 185 | /** | |
| 186 | * ARM VFP optimised int32 to float conversion. | |
| 187 | * Assume len is a multiple of 8, destination buffer is at least 4 bytes aligned | |
| 188 | * (16 bytes alignment is best for BCM2835), little-endian. | |
| 189 | * TODO: could be further optimised by unrolling and interleaving, as above | |
| 190 | */ | |
| 191 | @ void ff_int32_to_float_fmul_scalar_vfp(float *dst, const int32_t *src, float mul, int len) | |
| 192 | function ff_int32_to_float_fmul_scalar_vfp, export=1 | |
| 193 | VFP tmp .req a4 | |
| 194 | VFP len .req a3 | |
| 195 | NOVFP tmp .req a3 | |
| 196 | NOVFP len .req a4 | |
| 197 | NOVFP vmov s0, a3 | |
| 198 | ldr tmp, =0x03070000 @ RunFast mode, short vectors of length 8, stride 1 | |
| 199 | fmrx ip, FPSCR | |
| 200 | fmxr FPSCR, tmp | |
| 201 | 1: | |
| 202 | vldmia a2!, {s8-s15} | |
| 203 | vcvt.f32.s32 s8, s8 | |
| 204 | vcvt.f32.s32 s9, s9 | |
| 205 | vcvt.f32.s32 s10, s10 | |
| 206 | vcvt.f32.s32 s11, s11 | |
| 207 | vcvt.f32.s32 s12, s12 | |
| 208 | vcvt.f32.s32 s13, s13 | |
| 209 | vcvt.f32.s32 s14, s14 | |
| 210 | vcvt.f32.s32 s15, s15 | |
| 211 | vmul.f32 s8, s8, s0 | |
| 212 | subs len, len, #8 | |
| 213 | vstmia a1!, {s8-s11} | |
| 214 | vstmia a1!, {s12-s15} | |
| 215 | bne 1b | |
| 216 | ||
| 217 | fmxr FPSCR, ip | |
| 218 | bx lr | |
| 219 | endfunc | |
| 220 | .unreq tmp | |
| 221 | .unreq len |