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58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
// ------------------------------------------------------------------------------
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// qpc_fwht.h
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// Fast Walsh-Hadamard Transforms for q-ary polar codes
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//
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// (c) 2024 - Nico Palermo, IV3NWV - Microtelecom Srl, Italy
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// ------------------------------------------------------------------------------
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//
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// This source is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This file 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this source distribution.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef _qpc_fwht_h_
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#define _qpc_fwht_h_
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#include "np_qpc.h"
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#if QPC_LOG2Q==7
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#define qpc_fwht(a,b) qpc_fwht128(a,b)
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#endif
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#if QPC_LOG2Q==6
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#define qpc_fwht(a,b) qpc_fwht64(a,b)
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#endif
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#if QPC_LOG2Q==5
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#define qpc_fwht(a,b) qpc_fwht32(a,b)
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#endif
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#if QPC_LOG2Q==4
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#define qpc_fwht(a,b) qpc_fwht16(a,b)
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#endif
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// Note that it makes no sense to use fast convolutions
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// for transforms that are less than 16 symbols in size.
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// For such cases direct convolutions are faster.
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#if QPC_LOG2Q==3
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#define qpc_fwht(a,b) qpc_fwht8(a,b)
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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float* qpc_fwht8(float* y, float* x);
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float* qpc_fwht16(float* y, float* x);
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float* qpc_fwht32(float* y, float* x);
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float* qpc_fwht64(float* y, float* x);
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float* qpc_fwht128(float* y, float* x);
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#ifdef __cplusplus
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}
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#endif
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#endif // _qpc_fwht_h_
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