| /* |
| * NEON Convolution |
| * Copyright (C) 2012, 2013 Thomas Tsou <tom@tsou.cc> |
| * |
| * This library 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. |
| * |
| * This library 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 this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <malloc.h> |
| #include <string.h> |
| #include <stdio.h> |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| /* Forward declarations from base implementation */ |
| int _base_convolve_real(float *x, int x_len, |
| float *h, int h_len, |
| float *y, int y_len, |
| int start, int len, |
| int step, int offset); |
| |
| int _base_convolve_complex(float *x, int x_len, |
| float *h, int h_len, |
| float *y, int y_len, |
| int start, int len, |
| int step, int offset); |
| |
| int bounds_check(int x_len, int h_len, int y_len, |
| int start, int len, int step); |
| |
| #ifdef HAVE_NEON |
| /* Calls into NEON assembler */ |
| void neon_conv_real4(float *x, float *h, float *y, int len); |
| void neon_conv_real8(float *x, float *h, float *y, int len); |
| void neon_conv_real12(float *x, float *h, float *y, int len); |
| void neon_conv_real16(float *x, float *h, float *y, int len); |
| void neon_conv_real20(float *x, float *h, float *y, int len); |
| void mac_cx_neon4(float *x, float *h, float *y, int len); |
| |
| /* Complex-complex convolution */ |
| static void neon_conv_cmplx_4n(float *x, float *h, float *y, int h_len, int len) |
| { |
| for (int i = 0; i < len; i++) |
| mac_cx_neon4(&x[2 * i], h, &y[2 * i], h_len >> 2); |
| } |
| #endif |
| |
| /* API: Initalize convolve module */ |
| void convolve_init(void) |
| { |
| /* Stub */ |
| return; |
| } |
| |
| /* API: Aligned complex-real */ |
| int convolve_real(float *x, int x_len, |
| float *h, int h_len, |
| float *y, int y_len, |
| int start, int len, |
| int step, int offset) |
| { |
| void (*conv_func)(float *, float *, float *, int) = NULL; |
| |
| if (bounds_check(x_len, h_len, y_len, start, len, step) < 0) |
| return -1; |
| |
| memset(y, 0, len * 2 * sizeof(float)); |
| |
| #ifdef HAVE_NEON |
| if (step <= 4) { |
| switch (h_len) { |
| case 4: |
| conv_func = neon_conv_real4; |
| break; |
| case 8: |
| conv_func = neon_conv_real8; |
| break; |
| case 12: |
| conv_func = neon_conv_real12; |
| break; |
| case 16: |
| conv_func = neon_conv_real16; |
| break; |
| case 20: |
| conv_func = neon_conv_real20; |
| break; |
| } |
| } |
| #endif |
| if (conv_func) { |
| conv_func(&x[2 * (-(h_len - 1) + start)], |
| h, y, len); |
| } else { |
| _base_convolve_real(x, x_len, |
| h, h_len, |
| y, y_len, |
| start, len, step, offset); |
| } |
| |
| return len; |
| } |
| |
| |
| /* API: Aligned complex-complex */ |
| int convolve_complex(float *x, int x_len, |
| float *h, int h_len, |
| float *y, int y_len, |
| int start, int len, |
| int step, int offset) |
| { |
| void (*conv_func)(float *, float *, float *, int, int) = NULL; |
| |
| if (bounds_check(x_len, h_len, y_len, start, len, step) < 0) |
| return -1; |
| |
| memset(y, 0, len * 2 * sizeof(float)); |
| |
| #ifdef HAVE_NEON |
| if (step <= 4 && !(h_len % 4)) |
| conv_func = neon_conv_cmplx_4n; |
| #endif |
| if (conv_func) { |
| conv_func(&x[2 * (-(h_len - 1) + start)], |
| h, y, h_len, len); |
| } else { |
| _base_convolve_complex(x, x_len, |
| h, h_len, |
| y, y_len, |
| start, len, step, offset); |
| } |
| |
| return len; |
| } |