shithub: opus

ref: dac77d134471a02a4d5b8260650882b2a7517a83
dir: /silk/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.              */

opus_int32 silk_inner_prod_aligned(
    const opus_int16 *const  inVec1,     /*    I input vector 1    */
    const opus_int16 *const  inVec2,     /*    I input vector 2    */
    const opus_int           len         /*    I vector lengths    */
)
{
    opus_int   i;
    opus_int32 sum = 0;
    for( i = 0; i < len; i++ ) {
        sum = SKP_SMLABB( sum, inVec1[ i ], inVec2[ i ] );
    }
    return sum;
}

opus_int32 silk_inner_prod_aligned_scale(
    const opus_int16 *const  inVec1,     /*    I input vector 1          */
    const opus_int16 *const  inVec2,     /*    I input vector 2          */
    const opus_int           scale,      /*    I number of bits to shift */
    const opus_int           len         /*    I vector lengths          */
)
{
    opus_int   i;
    opus_int32 sum = 0;
    for( i = 0; i < len; i++ ) {
        sum = SKP_ADD_RSHIFT32( sum, SKP_SMULBB( inVec1[ i ], inVec2[ i ] ), scale );
    }
    return sum;
}

opus_int64 silk_inner_prod16_aligned_64(
    const opus_int16         *inVec1,    /*    I input vector 1    */
    const opus_int16         *inVec2,    /*    I input vector 2    */
    const opus_int           len         /*    I vector lengths    */
)
{
    opus_int   i;
    opus_int64 sum = 0;
    for( i = 0; i < len; i++ ) {
        sum = SKP_SMLALBB( sum, inVec1[ i ], inVec2[ i ] );
    }
    return sum;
}