/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, (subject to the limitations in the disclaimer below)
are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of Skype Limited, nor the names of specific
contributors, may be used to endorse or promote products derived from
this software without specific prior written permission.
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/

#ifndef _SILK_API_C_H_
#define _SILK_API_C_H_

/* 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)             ((((a) + (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)             ((((a)-(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
#define matrix_c_adr(Matrix_base_adr, row, column, M)        (Matrix_base_adr + ((row)+(M)*(column)))

#endif /* _SILK_API_C_H_ */