feat: add complex/float64/base/add4

lib/node_modules/@stdlib/complex/float64/base/add4/README.md

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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.
+
+-->
+
+# add4
+
+> Compute the sum of four double-precision complex floating-point numbers.
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var add4 = require( '@stdlib/complex/float64/base/add4' );
+```
+
+#### add4( z1, z2, z3, z4 )
+
+Computes the sum of four double-precision complex floating-point numbers.
+
+```javascript
+var Complex128 = require( '@stdlib/complex/float64/ctor' );
+
+var z = new Complex128( -1.5, 2.5 );
+
+var v = add4( z, z, z, z );
+// returns <Complex128>[ -7.5, 12.5 ]
+```
+
+The function supports the following parameters:
+
+-   **z1**: first complex number.
+-   **z2**: second complex number.
+-   **z3**: third complex number.
+-   **z4**: fourth complex number.
+
+#### add4.assign( re1, im1, re2, im2, re3, im3, re4, im4, out, strideOut, offsetOut )
+
+Computes the sum of four double-precision complex floating-point numbers and assigns results to a provided output array.
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var out = new Float64Array( 2 );
+var v = add4.assign( 5.0, 3.0, -2.0, 1.0, 5.0, 3.0, 1.0, 4.0, out, 1, 0 );
+// returns <Float64Array>[ 9.0, 11.0 ]
+
+var bool = ( out === v );
+// returns true
+```
+
+The function supports the following parameters:
+
+-   **re1**: real component of the first complex number.
+-   **im1**: imaginary component of the first complex number.
+-   **re2**: real component of the second complex number.
+-   **im2**: imaginary component of the second complex number.
+-   **re3**: real component of the third complex number.
+-   **im3**: imaginary component of the third complex number.
+-   **re4**: real component of the fourth complex number.
+-   **im4**: imaginary component of the fourth complex number.
+-   **out**: output array.
+-   **strideOut**: stride length for `out`.
+-   **offsetOut**: starting index for `out`.
+
+#### add4.strided( z1, sz1, oz1, z2, sz2, oz2, z3, sz3, oz3, z4, sz4, oz4, out, so, oo )
+
+Computes the sum of four double-precision complex floating-point numbers stored in real-valued strided array views and assigns results to a provided strided output array.
+
+```javascript
+var Float64Array = require( '@stdlib/array/float64' );
+
+var z1 = new Float64Array( [ 5.0, 3.0 ] );
+var z2 = new Float64Array( [ -2.0, 1.0 ] );
+var z3 = new Float64Array( [ 5.0, 3.0 ] );
+var z4 = new Float64Array( [ 1.0, 4.0 ] );
+var out = new Float64Array( 2 );
+
+var v = add4.strided( z1, 1, 0, z2, 1, 0, z3, 1, 0, z4, 1, 0, out, 1, 0 );
+// returns <Float64Array>[ 9.0, 11.0 ]
+
+var bool = ( out === v );
+// returns true
+```
+
+The function supports the following parameters:
+
+-   **z1**: first complex number strided array view.
+-   **sz1**: stride length for `z1`.
+-   **oz1**: starting index for `z1`.
+-   **z2**: second complex number strided array view.
+-   **sz2**: stride length for `z2`.
+-   **oz2**: starting index for `z2`.
+-   **z3**: third complex number strided array view.
+-   **sz3**: stride length for `z3`.
+-   **oz3**: starting index for `z3`.
+-   **z4**: fourth complex number strided array view.
+-   **sz4**: stride length for `z4`.
+-   **oz4**: starting index for `z4`.
+-   **out**: output array.
+-   **so**: stride length for `out`.
+-   **oo**: starting index for `out`.
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var Complex128Array = require( '@stdlib/array/complex128' );
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var logEachMap = require( '@stdlib/console/log-each-map' );
+var add4 = require( '@stdlib/complex/float64/base/add4' );
+
+// Generate arrays of random values:
+var z1 = new Complex128Array( discreteUniform( 200, -50, 50 ) );
+var z2 = new Complex128Array( discreteUniform( 200, -50, 50 ) );
+var z3 = new Complex128Array( discreteUniform( 200, -50, 50 ) );
+var z4 = new Complex128Array( discreteUniform( 200, -50, 50 ) );
+
+// Perform element-wise addition:
+logEachMap( '(%s) + (%s) + (%s) + (%s) = %s', z1, z2, z3, z4, add4 );
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/complex/float64/base/add4.h"
+```
+
+#### stdlib_base_complex128_add4( z1, z2, z3, z4 )
+
+Computes the sum of four double-precision complex floating-point numbers.
+
+```c
+#include "stdlib/complex/float64/ctor.h"
+#include "stdlib/complex/float64/real.h"
+#include "stdlib/complex/float64/imag.h"
+
+stdlib_complex128_t z = stdlib_complex128( 3.0, -2.0 );
+
+stdlib_complex128_t out = stdlib_base_complex128_add4( z, z, z, z );
+
+double re = stdlib_complex128_real( out );
+// returns 12.0
+
+double im = stdlib_complex128_imag( out );
+// returns -8.0
+```
+
+The function accepts the following arguments:
+
+-   **z1**: `[in] stdlib_complex128_t` first input value.
+-   **z2**: `[in] stdlib_complex128_t` second input value.
+-   **z3**: `[in] stdlib_complex128_t` third input value.
+-   **z4**: `[in] stdlib_complex128_t` fourth input value.
+
+```c
+stdlib_complex128_t stdlib_base_complex128_add4( const stdlib_complex128_t z1, const stdlib_complex128_t z2, const stdlib_complex128_t z3, const stdlib_complex128_t z4 );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/complex/float64/base/add4.h"
+#include "stdlib/complex/float64/ctor.h"
+#include "stdlib/complex/float64/reim.h"
+#include <stdio.h>
+
+int main( void ) {
+    const stdlib_complex128_t x[] = {
+        stdlib_complex128( 3.14, 1.5 ),
+        stdlib_complex128( -3.14, 1.5 ),
+        stdlib_complex128( 0.0, -0.0 ),
+        stdlib_complex128( 0.0/0.0, 0.0/0.0 )
+    };
+
+    stdlib_complex128_t v;
+    stdlib_complex128_t y;
+    double re;
+    double im;
+    int i;
+    for ( i = 0; i < 4; i++ ) {
+        v = x[ i ];
+        stdlib_complex128_reim( v, &re, &im );
+        printf( "z = %lf + %lfi\n", re, im );
+
+        y = stdlib_base_complex128_add4( v, v, v, v );
+        stdlib_complex128_reim( y, &re, &im );
+        printf( "add4(z, z, z, z) = %lf + %lfi\n", re, im );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/complex/float64/base/add4/benchmark/benchmark.assign.js

@@ -0,0 +1,71 @@
+/**
+* @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 bench = require( '@stdlib/bench' );
+var uniform = require( '@stdlib/random/array/uniform' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var Float64Array = require( '@stdlib/array/float64' );
+var format = require( '@stdlib/string/format' );
+var pkg = require( './../package.json' ).name;
+var add4 = require( './../lib' );
+
+
+// VARIABLES //
+
+var options = {
+	'dtype': 'float64'
+};
+
+
+// MAIN //
+
+bench( format( '%s:assign', pkg ), function benchmark( b ) {
+	var out;
+	var re;
+	var im;
+	var N;
+	var i;
+	var j;
+	var k;
+
+	N = 100;
+	re = uniform( N, -500.0, 500.0, options );
+	im = uniform( N, -500.0, 500.0, options );
+
+	out = new Float64Array( 2 );
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		j = i % N;
+		k = ( i+1 ) % N;
+		out = add4.assign( re[ j ], im[ j ], re[ k ], im[ k ], re[ j ], im[ k ], re[ j ], im[ k ], out, 1, 0 ); // eslint-disable-line max-len
+		if ( typeof out !== 'object' ) {
+			b.fail( 'should return an object' );
+		}
+	}
+	b.toc();
+	if ( isnan( out[ 0 ] ) || isnan( out[ 1 ] ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});