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* @license Apache-2.0
*
* Copyright (c) 2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// VARIABLES //
var M = 5;
// MAIN //
/**
* Computes the dot product of `x` and `y`.
*
* @private
* @param {integer} N - number of indexed elements
* @param {Object} x - first input array object
* @param {Collection} x.data - first input array data
* @param {Array<Function>} x.accessors - first array element accessors
* @param {integer} strideX - `x` stride length
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {Object} y - second input array object
* @param {Collection} y.data - second input array data
* @param {Array<Function>} y.accessors - second array element accessors
* @param {integer} strideY - `y` stride length
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @returns {number} dot product
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = [ 4.0, 2.0, -3.0, 5.0, -1.0 ];
* var y = [ 2.0, 6.0, -1.0, -4.0, 8.0 ];
*
* var z = gdot( x.length, arraylike2object( toAccessorArray( x ) ), 1, 0, arraylike2object( toAccessorArray( y ) ), 1, 0 );
* // returns -5.0
*/
function gdot( N, x, strideX, offsetX, y, strideY, offsetY ) {
var xbuf;
var ybuf;
var xget;
var yget;
var dot;
var ix;
var iy;
var m;
var i;
xbuf = x.data;
ybuf = y.data;
xget = x.accessors[ 0 ];
yget = y.accessors[ 0 ];
dot = 0.0;
ix = offsetX;
iy = offsetY;
// Use unrolled loops if both strides are equal to `1`...
if ( strideX === 1 && strideY === 1 ) {
m = N % M;
// If we have a remainder, run a clean-up loop...
if ( m > 0 ) {
for ( i = 0; i < m; i++ ) {
dot += xget( xbuf, ix ) * yget( ybuf, iy );
ix += 1;
iy += 1;
}
}
if ( N < M ) {
return dot;
}
for ( i = m; i < N; i += M ) {
dot += ( xget( xbuf, ix ) * yget( ybuf, iy ) ) + ( xget( xbuf, ix+1 ) * yget( ybuf, iy+1 ) ) + ( xget( xbuf, ix+2 ) * yget( ybuf, iy+2 ) ) + ( xget( xbuf, ix+3 ) * yget( ybuf, iy+3 ) ) + ( xget( xbuf, ix+4 ) * yget( ybuf, iy+4 ) ); // eslint-disable-line max-len
ix += M;
iy += M;
}
return dot;
}
for ( i = 0; i < N; i++ ) {
dot += xget( xbuf, ix ) * yget( ybuf, iy );
ix += strideX;
iy += strideY;
}
return dot;
}
// EXPORTS //
module.exports = gdot;
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