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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';
// MODULES //
var reinterpret = require( '@stdlib/strided/base/reinterpret-complex128' );
// VARIABLES //
var M = 5;
// MAIN //
/**
* Adds elements of a double-precision complex floating-point strided array `x` to the corresponding elements of a double-precision complex floating-point strided array `y` and assigns the results to `y` using alternative indexing semantics.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Complex128Array} x - input array
* @param {integer} strideX - `x` stride length
* @param {NonNegativeInteger} offsetX - starting `x` index
* @param {Complex128Array} y - output array
* @param {integer} strideY - `y` stride length
* @param {NonNegativeInteger} offsetY - starting `y` index
* @returns {Complex128Array} output array
*
* @example
* var Complex128Array = require( '@stdlib/array/complex128' );
*
* var x = new Complex128Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
* var y = new Complex128Array( [ 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 ] );
*
* zxpy( x.length, x, 1, 0, y, 1, 0 );
* // y => <Complex128Array>[ 3.0, 5.0, 7.0, 9.0, 11.0, 13.0 ]
*/
function zxpy( N, x, strideX, offsetX, y, strideY, offsetY ) {
var xview;
var yview;
var ix;
var iy;
var sx;
var sy;
var m;
var i;
if ( N <= 0 ) {
return y;
}
// Reinterpret the complex input arrays as real-valued arrays:
xview = reinterpret( x, 0 );
yview = reinterpret( y, 0 );
// Adjust the strides and offsets according to the real-valued arrays:
ix = offsetX * 2;
iy = offsetY * 2;
sx = strideX * 2;
sy = strideY * 2;
// Use loop unrolling 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++ ) {
yview[ iy ] += xview[ ix ];
yview[ iy+1 ] += xview[ ix+1 ];
ix += sx;
iy += sy;
}
}
if ( N < M ) {
return y;
}
for ( i = m; i < N; i += M ) {
yview[ iy ] += xview[ ix ];
yview[ iy+1 ] += xview[ ix+1 ];
yview[ iy+2 ] += xview[ ix+2 ];
yview[ iy+3 ] += xview[ ix+3 ];
yview[ iy+4 ] += xview[ ix+4 ];
yview[ iy+5 ] += xview[ ix+5 ];
yview[ iy+6 ] += xview[ ix+6 ];
yview[ iy+7 ] += xview[ ix+7 ];
yview[ iy+8 ] += xview[ ix+8 ];
yview[ iy+9 ] += xview[ ix+9 ];
ix += M * 2;
iy += M * 2;
}
return y;
}
for ( i = 0; i < N; i++ ) {
yview[ iy ] += xview[ ix ];
yview[ iy+1 ] += xview[ ix+1 ];
ix += sx;
iy += sy;
}
return y;
}
// EXPORTS //
module.exports = zxpy;
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