feat: add native addon to cphase API

lib/node_modules/@stdlib/math/base/special/cphase/README.md

@@ -20,7 +20,7 @@ limitations under the License.
 
 # phase
 
-> Compute the [argument][complex-number-argument] of a complex number in radians.
+> Compute the [argument][complex-number-argument] of a double-precision complex floating-point number in radians.
 
 <section class="intro">
 
@@ -38,12 +38,14 @@ The [argument][complex-number-argument] of a complex number, also known as the *
 var cphase = require( '@stdlib/math/base/special/cphase' );
 ```
 
-#### cphase( re, im )
+#### cphase( z )
 
-Computes the [argument][complex-number-argument] of a `complex` number comprised of a **real** component `re` and an **imaginary** component `im`.
+Computes the [argument][complex-number-argument] of a double-precision complex floating-point number.
 
 ```javascript
-var phi = cphase( 5.0, 3.0 );
+var Complex128 = require( '@stdlib/complex/float64' );
+
+var phi = cphase( new Complex128( 5.0, 3.0 ) );
 // returns ~0.5404
 ```
 
@@ -59,29 +61,127 @@ var phi = cphase( 5.0, 3.0 );
 
 ```javascript
 var Complex128 = require( '@stdlib/complex/float64' );
-var randu = require( '@stdlib/random/base/randu' );
-var round = require( '@stdlib/math/base/special/round' );
-var real = require( '@stdlib/complex/real' );
-var imag = require( '@stdlib/complex/imag' );
+var uniform = require( '@stdlib/random/base/uniform' );
 var cphase = require( '@stdlib/math/base/special/cphase' );
 
-var re;
-var im;
 var z;
 var i;
 
 for ( i = 0; i < 100; i++ ) {
-    re = round( randu()*100.0 ) - 50.0;
-    im = round( randu()*100.0 ) - 50.0;
-    z = new Complex128( re, im );
-    console.log( 'arg(%s) = %d', z.toString(), cphase( real(z), imag(z) ) );
+    z = new Complex128( uniform( -500.0, 500.0 ), uniform( -500.0, 500.0 ) );
+    console.log( 'arg(%s) = %d', z.toString(), cphase( z ) );
+}
+```
+
+</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/math/base/special/cphase.h"
+```
+
+#### stdlib_base_cphase( z )
+
+Computes the [argument][complex-number-argument] of a double-precision complex floating-point number.
+
+```c
+#include "stdlib/complex/float64.h"
+#include "stdlib/complex/real.h"
+#include "stdlib/complex/imag.h"
+
+stdlib_complex128_t z = stdlib_complex128( 5.0, 3.0 );
+double out = stdlib_base_cphase( z );
+// returns ~0.5404
+```
+
+The function accepts the following arguments:
+
+-   **z**: `[in] stdlib_complex128_t` input value.
+
+```c
+double stdlib_base_cphase( const stdlib_complex128_t z );
+```
+
+</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/math/base/special/cphase.h"
+#include "stdlib/complex/float64.h"
+#include "stdlib/complex/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 re1;
+    double im1;
+    double re2;
+    double im2;
+    int i;
+    for ( i = 0; i < 4; i++ ) {
+        v = x[ i ];
+        y = stdlib_base_cphase( v );
+        stdlib_reim( v, &re1, &im1 );
+        stdlib_reim( y, &re2, &im2 );
+        printf( "fcphase(%lf + %lfi) = %lf\n", re, im, y );
+    }
 }
 ```
 
 </section>
 
 <!-- /.examples -->
 
+</section>
+
+<!-- /.c -->
+
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 
 <section class="related">

lib/node_modules/@stdlib/math/base/special/cphase/benchmark/benchmark.js

@@ -21,7 +21,8 @@
 // MODULES //
 
 var bench = require( '@stdlib/bench' );
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/base/uniform' );
+var Complex128 = require( '@stdlib/complex/float64' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var pkg = require( './../package.json' ).name;
 var cphase = require( './../lib' );
@@ -30,16 +31,18 @@ var cphase = require( './../lib' );
 // MAIN //
 
 bench( pkg, function benchmark( b ) {
-	var re;
-	var im;
+	var values;
 	var y;
 	var i;
 
+	values = [
+		new Complex128( uniform( -500.0, 500.0 ), uniform( -500.0, 500.0 ) ),
+		new Complex128( uniform( -500.0, 500.0 ), uniform( -500.0, 500.0 ) )
+	];
+
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		re = ( randu()*1000.0 ) - 500.0;
-		im = ( randu()*1000.0 ) - 500.0;
-		y = cphase( re, im );
+		y = cphase( values[ i%values.length ] );
 		if ( isnan( y ) ) {
 			b.fail( 'should not return NaN' );
 		}

lib/node_modules/@stdlib/math/base/special/cphase/benchmark/benchmark.native.js

@@ -0,0 +1,65 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2023 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 resolve = require( 'path' ).resolve;
+var bench = require( '@stdlib/bench' );
+var uniform = require( '@stdlib/random/base/uniform' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var Complex128 = require( '@stdlib/complex/float64' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var cphase = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( cphase instanceof Error )
+};
+
+
+// MAIN //
+
+bench( pkg+'::native', opts, function benchmark( b ) {
+	var values;
+	var y;
+	var i;
+
+	values = [
+		new Complex128( uniform( -500.0, 500.0 ), uniform( -500.0, 500.0 ) ),
+		new Complex128( uniform( -500.0, 500.0 ), uniform( -500.0, 500.0 ) )
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = cphase( values[ i%values.length ] );
+		if ( isnan( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});