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* @license Apache-2.0
*
* Copyright (c) 2026 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';
// MAIN //
/**
* Multiplies each element in a strided array `x` by a constant and adds the result to each element in a strided array `y` before assigning the results to a strided array `w`.
*
* @private
* @param {PositiveInteger} N - number of indexed elements
* @param {number} alpha - scalar constant
* @param {Object} x - first input array object
* @param {Collection} x.data - input array data
* @param {Array<Function>} x.accessors - array element accessors
* @param {integer} strideX - `x` stride length
* @param {NonNegativeInteger} offsetX - starting `x` index
* @param {Object} y - second input array object
* @param {Collection} y.data - input array data
* @param {Array<Function>} y.accessors - array element accessors
* @param {integer} strideY - `y` stride length
* @param {NonNegativeInteger} offsetY - starting `y` index
* @param {Object} w - output array object
* @param {Collection} w.data - output array data
* @param {Array<Function>} w.accessors - array element accessors
* @param {integer} strideW - `w` stride length
* @param {NonNegativeInteger} offsetW - starting `w` index
* @returns {Object} output array object
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
* var y = [ 2.0, 3.0, 4.0, 5.0, 6.0 ];
* var w = [ 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* gwaxpy( x.length, 3.0, arraylike2object( toAccessorArray( x ) ), 1, 0, arraylike2object( toAccessorArray( y ) ), 1, 0, arraylike2object( toAccessorArray( w ) ), 1, 0 );
* // w => [ 5.0, 9.0, 13.0, 17.0, 21.0 ]
*/
function gwaxpy( N, alpha, x, strideX, offsetX, y, strideY, offsetY, w, strideW, offsetW ) { // eslint-disable-line max-len, max-params
var xbuf;
var ybuf;
var wbuf;
var xget;
var yget;
var wset;
var ix;
var iy;
var iw;
var i;
// Cache references to array data:
xbuf = x.data;
ybuf = y.data;
wbuf = w.data;
// Cache references to element accessors:
xget = x.accessors[ 0 ];
yget = y.accessors[ 0 ];
wset = w.accessors[ 1 ];
ix = offsetX;
iy = offsetY;
iw = offsetW;
for ( i = 0; i < N; i++ ) {
wset( wbuf, iw, ( alpha * xget( xbuf, ix ) ) + yget( ybuf, iy ) );
ix += strideX;
iy += strideY;
iw += strideW;
}
return w;
}
// EXPORTS //
module.exports = gwaxpy;
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