75 lines
3.8 KiB
C
75 lines
3.8 KiB
C
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/******************************************************************************
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*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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#ifndef VAR_Q_OPERATOR_H
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#define VAR_Q_OPERATOR_H
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typedef struct
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{
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WORD32 sm; /* MSB 1 bit sign & rest magnitude */
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WORD32 e; /* Q-format */
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} number_t;
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void mult32_var_q(number_t a, number_t b, number_t *c);
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void div32_var_q(number_t a, number_t b, number_t *c);
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void add32_var_q(number_t a, number_t b, number_t *c);
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void sub32_var_q(number_t a, number_t b, number_t *c);
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void sqrt32_var_q(number_t a, number_t *c);
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void number_t_to_word32(number_t num_a, WORD32 *a);
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void convert_float_to_fix(float a_f, number_t *a);
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void convert_fix_to_float(number_t a, float *a_f);
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#define SET_VAR_Q(a, b, c) \
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{ \
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(a).sm = (b); \
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(a).e = (c); \
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}
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/*right shift greated than 32 bit for word32 variable is undefined*/
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#define convert_varq_to_fixq(varq, a, q_fact) \
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{ \
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if((varq).e > q_fact) \
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{ \
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if(((varq).e - q_fact) >= (WORD32)(sizeof(WORD32) * 8)) \
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{ \
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*a = 0; \
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} \
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else \
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{ \
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*a = (varq).sm >> ((varq).e - q_fact); \
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} \
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} \
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else \
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*a = (varq).sm << (q_fact - (varq).e); \
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}
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#define SET_VARQ_FRM_FIXQ(fixq, var_q, q_fact) \
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{ \
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(var_q).sm = fixq; \
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(var_q).e = q_fact; \
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}
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#endif
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