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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-complex64' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );
var ccopy = require( '@stdlib/blas/base/ccopy' ).ndarray;
var cmulf = require( '@stdlib/complex/float32/base/mul' ).assign;
// VARIABLES //
var M = 5;
// MAIN //
/**
* Multiplies each element in a single-precision complex floating-point strided array `x` by a scalar constant and assigns the results to elements in a single-precision complex floating-point strided array `w` using alternative indexing semantics.
*
* @param {PositiveInteger} N - number of indexed elements
* @param {Complex64} alpha - scalar constant
* @param {Complex64Array} x - input array
* @param {integer} strideX - `x` stride length
* @param {NonNegativeInteger} offsetX - starting `x` index
* @param {Complex64Array} w - output array
* @param {integer} strideW - `w` stride length
* @param {NonNegativeInteger} offsetW - starting `w` index
* @returns {Complex64Array} output array
*
* @example
* var Complex64Array = require( '@stdlib/array/complex64' );
* var Complex64 = require( '@stdlib/complex/float32/ctor' );
*
* var x = new Complex64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
* var w = new Complex64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
* var alpha = new Complex64( 5.0, 3.0 );
*
* cwax( x.length, alpha, x, 1, 0, w, 1, 0 );
* // w => <Complex64Array>[ -1.0, 13.0, 3.0, 29.0, 7.0, 45.0 ]
*/
function cwax( N, alpha, x, strideX, offsetX, w, strideW, offsetW ) {
var xview;
var wview;
var are;
var aim;
var ix;
var iw;
var sx;
var sw;
var m;
var i;
if ( N <= 0 ) {
return w;
}
// Decompose the constant into its real and imaginary components:
are = realf( alpha );
aim = imagf( alpha );
// Fast path: when alpha = 1+0i, delegate to ccopy (w = x)
if ( are === 1.0 && aim === 0.0 ) {
return ccopy( N, x, strideX, offsetX, w, strideW, offsetW );
}
// Reinterpret the complex input arrays as real-valued arrays:
xview = reinterpret( x, 0 );
wview = reinterpret( w, 0 );
// Adjust the strides and offsets according to the real-valued arrays:
ix = offsetX * 2;
iw = offsetW * 2;
sx = strideX * 2;
sw = strideW * 2;
// Use loop unrolling if both strides are equal to `1`...
if ( strideX === 1 && strideW === 1 ) {
m = N % M;
// If we have a remainder, run a clean-up loop...
if ( m > 0 ) {
for ( i = 0; i < m; i++ ) {
cmulf( are, aim, xview[ ix ], xview[ ix+1 ], wview, 1, iw );
ix += sx;
iw += sw;
}
}
if ( N < M ) {
return w;
}
for ( i = m; i < N; i += M ) {
cmulf( are, aim, xview[ ix ], xview[ ix+1 ], wview, 1, iw );
cmulf( are, aim, xview[ ix+2 ], xview[ ix+3 ], wview, 1, iw+2 );
cmulf( are, aim, xview[ ix+4 ], xview[ ix+5 ], wview, 1, iw+4 );
cmulf( are, aim, xview[ ix+6 ], xview[ ix+7 ], wview, 1, iw+6 );
cmulf( are, aim, xview[ ix+8 ], xview[ ix+9 ], wview, 1, iw+8 );
ix += M * 2;
iw += M * 2;
}
return w;
}
for ( i = 0; i < N; i++ ) {
cmulf( are, aim, xview[ ix ], xview[ ix+1 ], wview, 1, iw );
ix += sx;
iw += sw;
}
return w;
}
// EXPORTS //
module.exports = cwax;
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