Thomas Tsou | 7e4e536 | 2013-10-30 21:18:55 -0400 | [diff] [blame] | 1 | /* |
| 2 | * NEON Convolution |
| 3 | * Copyright (C) 2012, 2013 Thomas Tsou <tom@tsou.cc> |
| 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2.1 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | #include <malloc.h> |
| 21 | #include <string.h> |
| 22 | #include <stdio.h> |
| 23 | |
| 24 | #ifdef HAVE_CONFIG_H |
| 25 | #include "config.h" |
| 26 | #endif |
| 27 | |
| 28 | /* Forward declarations from base implementation */ |
| 29 | int _base_convolve_real(float *x, int x_len, |
| 30 | float *h, int h_len, |
| 31 | float *y, int y_len, |
| 32 | int start, int len, |
| 33 | int step, int offset); |
| 34 | |
| 35 | int _base_convolve_complex(float *x, int x_len, |
| 36 | float *h, int h_len, |
| 37 | float *y, int y_len, |
| 38 | int start, int len, |
| 39 | int step, int offset); |
| 40 | |
| 41 | int bounds_check(int x_len, int h_len, int y_len, |
| 42 | int start, int len, int step); |
| 43 | |
| 44 | #ifdef HAVE_NEON |
| 45 | /* Calls into NEON assembler */ |
| 46 | void neon_conv_real4(float *x, float *h, float *y, int len); |
| 47 | void neon_conv_real8(float *x, float *h, float *y, int len); |
| 48 | void neon_conv_real12(float *x, float *h, float *y, int len); |
| 49 | void neon_conv_real16(float *x, float *h, float *y, int len); |
| 50 | void neon_conv_real20(float *x, float *h, float *y, int len); |
| 51 | void mac_cx_neon4(float *x, float *h, float *y, int len); |
| 52 | |
| 53 | /* Complex-complex convolution */ |
| 54 | static void neon_conv_cmplx_4n(float *x, float *h, float *y, int h_len, int len) |
| 55 | { |
| 56 | for (int i = 0; i < len; i++) |
| 57 | mac_cx_neon4(&x[2 * i], h, &y[2 * i], h_len >> 2); |
| 58 | } |
| 59 | #endif |
| 60 | |
Philipp Maier | 7e07cf2 | 2017-03-15 18:09:35 +0100 | [diff] [blame] | 61 | /* API: Initalize convolve module */ |
| 62 | void convolve_init(void) |
| 63 | { |
| 64 | /* Stub */ |
| 65 | return; |
| 66 | } |
| 67 | |
Thomas Tsou | 7e4e536 | 2013-10-30 21:18:55 -0400 | [diff] [blame] | 68 | /* API: Aligned complex-real */ |
| 69 | int convolve_real(float *x, int x_len, |
| 70 | float *h, int h_len, |
| 71 | float *y, int y_len, |
| 72 | int start, int len, |
| 73 | int step, int offset) |
| 74 | { |
| 75 | void (*conv_func)(float *, float *, float *, int) = NULL; |
| 76 | |
| 77 | if (bounds_check(x_len, h_len, y_len, start, len, step) < 0) |
| 78 | return -1; |
| 79 | |
| 80 | memset(y, 0, len * 2 * sizeof(float)); |
| 81 | |
| 82 | #ifdef HAVE_NEON |
| 83 | if (step <= 4) { |
| 84 | switch (h_len) { |
| 85 | case 4: |
| 86 | conv_func = neon_conv_real4; |
| 87 | break; |
| 88 | case 8: |
| 89 | conv_func = neon_conv_real8; |
| 90 | break; |
| 91 | case 12: |
| 92 | conv_func = neon_conv_real12; |
| 93 | break; |
| 94 | case 16: |
| 95 | conv_func = neon_conv_real16; |
| 96 | break; |
| 97 | case 20: |
| 98 | conv_func = neon_conv_real20; |
| 99 | break; |
| 100 | } |
| 101 | } |
| 102 | #endif |
| 103 | if (conv_func) { |
| 104 | conv_func(&x[2 * (-(h_len - 1) + start)], |
| 105 | h, y, len); |
| 106 | } else { |
| 107 | _base_convolve_real(x, x_len, |
| 108 | h, h_len, |
| 109 | y, y_len, |
| 110 | start, len, step, offset); |
| 111 | } |
| 112 | |
| 113 | return len; |
| 114 | } |
| 115 | |
| 116 | |
| 117 | /* API: Aligned complex-complex */ |
| 118 | int convolve_complex(float *x, int x_len, |
| 119 | float *h, int h_len, |
| 120 | float *y, int y_len, |
| 121 | int start, int len, |
| 122 | int step, int offset) |
| 123 | { |
| 124 | void (*conv_func)(float *, float *, float *, int, int) = NULL; |
| 125 | |
| 126 | if (bounds_check(x_len, h_len, y_len, start, len, step) < 0) |
| 127 | return -1; |
| 128 | |
| 129 | memset(y, 0, len * 2 * sizeof(float)); |
| 130 | |
| 131 | #ifdef HAVE_NEON |
| 132 | if (step <= 4 && !(h_len % 4)) |
| 133 | conv_func = neon_conv_cmplx_4n; |
| 134 | #endif |
| 135 | if (conv_func) { |
| 136 | conv_func(&x[2 * (-(h_len - 1) + start)], |
| 137 | h, y, h_len, len); |
| 138 | } else { |
| 139 | _base_convolve_complex(x, x_len, |
| 140 | h, h_len, |
| 141 | y, y_len, |
| 142 | start, len, step, offset); |
| 143 | } |
| 144 | |
| 145 | return len; |
| 146 | } |