silk_inner_prod_aligned.c

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#include "silk_SigProc_FIX.h"

/* sum= for(i=0;i<len;i++)inVec1[i]*inVec2[i];      ---        inner product    */
/* Note for ARM asm:                                                            */
/*        * inVec1 and inVec2 should be at least 2 byte aligned.    (Or defined as short/int16) */
/*        * len should be positive 16bit integer.                               */
/*        * only when len>6, memory access can be reduced by half.              */

SKP_int32 silk_inner_prod_aligned(
    const SKP_int16 *const  inVec1,     /*    I input vector 1    */
    const SKP_int16 *const  inVec2,     /*    I input vector 2    */
    const SKP_int           len         /*    I vector lengths    */
)
{
    SKP_int   i; 
    SKP_int32 sum = 0;
    for( i = 0; i < len; i++ ) {
        sum = SKP_SMLABB( sum, inVec1[ i ], inVec2[ i ] );
    }
    return sum;
}

SKP_int32 silk_inner_prod_aligned_scale(
    const SKP_int16 *const  inVec1,     /*    I input vector 1          */
    const SKP_int16 *const  inVec2,     /*    I input vector 2          */
    const SKP_int           scale,      /*    I number of bits to shift */
    const SKP_int           len         /*    I vector lengths          */
)
{
    SKP_int   i; 
    SKP_int32 sum = 0;
    for( i = 0; i < len; i++ ) {
        sum = SKP_ADD_RSHIFT32( sum, SKP_SMULBB( inVec1[ i ], inVec2[ i ] ), scale );
    }
    return sum;
}

SKP_int64 silk_inner_prod16_aligned_64(
    const SKP_int16         *inVec1,    /*    I input vector 1    */ 
    const SKP_int16         *inVec2,    /*    I input vector 2    */
    const SKP_int           len         /*    I vector lengths    */
)
{
    SKP_int   i; 
    SKP_int64 sum = 0;
    for( i = 0; i < len; i++ ) {
        sum = SKP_SMLALBB( sum, inVec1[ i ], inVec2[ i ] );
    }
    return sum;
}