opus/silk/macros.h

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#ifndef SILK_MACROS_H
#define SILK_MACROS_H

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

/* This is an inline header file for general platform. */

/* (a32 * (opus_int32)((opus_int16)(b32))) >> 16 output have to be 32bit int */
#define silk_SMULWB(a32, b32)            ((((a32) >> 16) * (opus_int32)((opus_int16)(b32))) + ((((a32) & 0x0000FFFF) * (opus_int32)((opus_int16)(b32))) >> 16))

/* a32 + (b32 * (opus_int32)((opus_int16)(c32))) >> 16 output have to be 32bit int */
#define silk_SMLAWB(a32, b32, c32)       ((a32) + ((((b32) >> 16) * (opus_int32)((opus_int16)(c32))) + ((((b32) & 0x0000FFFF) * (opus_int32)((opus_int16)(c32))) >> 16)))

/* (a32 * (b32 >> 16)) >> 16 */
#define silk_SMULWT(a32, b32)            (((a32) >> 16) * ((b32) >> 16) + ((((a32) & 0x0000FFFF) * ((b32) >> 16)) >> 16))

/* a32 + (b32 * (c32 >> 16)) >> 16 */
#define silk_SMLAWT(a32, b32, c32)       ((a32) + (((b32) >> 16) * ((c32) >> 16)) + ((((b32) & 0x0000FFFF) * ((c32) >> 16)) >> 16))

/* (opus_int32)((opus_int16)(a3))) * (opus_int32)((opus_int16)(b32)) output have to be 32bit int */
#define silk_SMULBB(a32, b32)            ((opus_int32)((opus_int16)(a32)) * (opus_int32)((opus_int16)(b32)))

/* a32 + (opus_int32)((opus_int16)(b32)) * (opus_int32)((opus_int16)(c32)) output have to be 32bit int */
#define silk_SMLABB(a32, b32, c32)       ((a32) + ((opus_int32)((opus_int16)(b32))) * (opus_int32)((opus_int16)(c32)))

/* (opus_int32)((opus_int16)(a32)) * (b32 >> 16) */
#define silk_SMULBT(a32, b32)            ((opus_int32)((opus_int16)(a32)) * ((b32) >> 16))

/* a32 + (opus_int32)((opus_int16)(b32)) * (c32 >> 16) */
#define silk_SMLABT(a32, b32, c32)       ((a32) + ((opus_int32)((opus_int16)(b32))) * ((c32) >> 16))

/* a64 + (b32 * c32) */
#define silk_SMLAL(a64, b32, c32)        (silk_ADD64((a64), ((opus_int64)(b32) * (opus_int64)(c32))))

/* (a32 * b32) >> 16 */
#define silk_SMULWW(a32, b32)            silk_MLA(silk_SMULWB((a32), (b32)), (a32), silk_RSHIFT_ROUND((b32), 16))

/* a32 + ((b32 * c32) >> 16) */
#define silk_SMLAWW(a32, b32, c32)       silk_MLA(silk_SMLAWB((a32), (b32), (c32)), (b32), silk_RSHIFT_ROUND((c32), 16))

/* add/subtract with output saturated */
#define silk_ADD_SAT32(a, b)             ((((opus_uint32)(a) + (opus_uint32)(b)) & 0x80000000) == 0 ?                              \
                                        ((((a) & (b)) & 0x80000000) != 0 ? silk_int32_MIN : (a)+(b)) :   \
                                        ((((a) | (b)) & 0x80000000) == 0 ? silk_int32_MAX : (a)+(b)) )

#define silk_SUB_SAT32(a, b)             ((((opus_uint32)(a)-(opus_uint32)(b)) & 0x80000000) == 0 ?                                        \
                                        (( (a) & ((b)^0x80000000) & 0x80000000) ? silk_int32_MIN : (a)-(b)) :    \
                                        ((((a)^0x80000000) & (b)  & 0x80000000) ? silk_int32_MAX : (a)-(b)) )

static inline opus_int32 silk_CLZ16(opus_int16 in16)
{
    opus_int32 out32 = 0;
    if( in16 == 0 ) {
        return 16;
    }
    /* test nibbles */
    if( in16 & 0xFF00 ) {
        if( in16 & 0xF000 ) {
            in16 >>= 12;
        } else {
            out32 += 4;
            in16 >>= 8;
        }
    } else {
        if( in16 & 0xFFF0 ) {
            out32 += 8;
            in16 >>= 4;
        } else {
            out32 += 12;
        }
    }
    /* test bits and return */
    if( in16 & 0xC ) {
        if( in16 & 0x8 )
            return out32 + 0;
        else
            return out32 + 1;
    } else {
        if( in16 & 0xE )
            return out32 + 2;
        else
            return out32 + 3;
    }
}

static inline opus_int32 silk_CLZ32(opus_int32 in32)
{
    /* test highest 16 bits and convert to opus_int16 */
    if( in32 & 0xFFFF0000 ) {
        return silk_CLZ16((opus_int16)(in32 >> 16));
    } else {
        return silk_CLZ16((opus_int16)in32) + 16;
    }
}

/* Row based */
#define matrix_ptr(Matrix_base_adr, row, column, N)         *(Matrix_base_adr + ((row)*(N)+(column)))
#define matrix_adr(Matrix_base_adr, row, column, N)          (Matrix_base_adr + ((row)*(N)+(column)))

/* Column based */
#ifndef matrix_c_ptr
#   define matrix_c_ptr(Matrix_base_adr, row, column, M)    *(Matrix_base_adr + ((row)+(M)*(column)))
#endif

#endif /* SILK_MACROS_H */