feat: add math/base/special/fast/absf

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Author: nakul-krishnakumar

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

@@ -44,6 +44,7 @@ var fcns = fmath;
 <div class="namespace-toc">
 
 -   <span class="signature">[`abs( x )`][@stdlib/math/base/special/fast/abs]</span><span class="delimiter">: </span><span class="description">compute an absolute value.</span>
+-   <span class="signature">[`absf( x )`][@stdlib/math/base/special/fast/absf]</span><span class="delimiter">: </span><span class="description">compute an absolute value of a single-precision floating-point number.</span>
 -   <span class="signature">[`acosh( x )`][@stdlib/math/base/special/fast/acosh]</span><span class="delimiter">: </span><span class="description">compute the hyperbolic arccosine of a number.</span>
 -   <span class="signature">[`ampbm( x, y )`][@stdlib/math/base/special/fast/alpha-max-plus-beta-min]</span><span class="delimiter">: </span><span class="description">compute the hypotenuse using the alpha max plus beta min algorithm.</span>
 -   <span class="signature">[`asinh( x )`][@stdlib/math/base/special/fast/asinh]</span><span class="delimiter">: </span><span class="description">compute the hyperbolic arcsine of a number.</span>
@@ -113,6 +114,8 @@ console.log( objectKeys( fmath ) );
 
 [@stdlib/math/base/special/fast/abs]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/fast/abs
 
+[@stdlib/math/base/special/fast/absf]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/fast/absf
+
 [@stdlib/math/base/special/fast/acosh]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/fast/acosh
 
 [@stdlib/math/base/special/fast/alpha-max-plus-beta-min]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/fast/alpha-max-plus-beta-min

lib/node_modules/@stdlib/math/base/special/fast/absf/README.md

@@ -0,0 +1,231 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2020 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.
+
+-->
+
+# Absolute Value
+
+> Compute the [absolute value][absolute-value] of a single-precision floating-point number.
+
+<section class="intro">
+
+The [absolute value][absolute-value] is defined as
+
+<!-- <equation class="equation" label="eq:absolute_value" align="center" raw="|x| = \begin{cases} x & \textrm{if}\ x \geq 0 \\ -x & \textrm{if}\ x < 0\end{cases}" alt="Absolute value"> -->
+
+```math
+|x| = \begin{cases} x & \textrm{if}\ x \geq 0 \\ -x & \textrm{if}\ x < 0\end{cases}
+```
+
+<!-- <div class="equation" align="center" data-raw-text="|x| = \begin{cases} x &amp; \textrm{if}\ x \geq 0 \\ -x &amp; \textrm{if}\ x &lt; 0\end{cases}" data-equation="eq:absolute_value">
+    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@5b4ee1217697eb737011e0d588fddbb119806753/lib/node_modules/@stdlib/math/base/special/fast/absf/docs/img/equation_absolute_value.svg" alt="Absolute value">
+    <br>
+</div> -->
+
+<!-- </equation> -->
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var absf = require( '@stdlib/math/base/special/fast/absf' );
+```
+
+#### absf( x )
+
+Computes the [absolute value][absolute-value] of a single-precision floating-point number.
+
+```javascript
+var v = absf( -1.0 );
+// returns 1.0
+
+v = absf( 2.0 );
+// returns 2.0
+
+v = absf( 0.0 );
+// returns 0.0
+
+v = absf( NaN );
+// returns NaN
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+## Notes
+
+-   This implementation is **not** [IEEE 754][ieee754] compliant. If provided `-0`, the function returns `-0`.
+
+    ```javascript
+    var v = absf( -0.0 );
+    // returns -0.0
+    ```
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var discreteUniform = require( '@stdlib/random/array/discrete-uniform' );
+var logEachMap = require( '@stdlib/console/log-each-map' );
+var absf = require( '@stdlib/math/base/special/fast/absf' );
+
+var opts = {
+    'dtype': 'float32'
+};
+var x = discreteUniform( 100, -50, 50, opts );
+
+logEachMap( 'absf(%d) = %d', x, absf );
+```
+
+</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/fast/absf.h"
+```
+
+#### stdlib_base_fast_absf( x )
+
+Computes the absolute value of a single-precision floating-point number.
+
+```c
+float y = stdlib_base_fast_absf( -5.0f );
+// returns 5.0f
+```
+
+The function accepts the following arguments:
+
+-   **x**: `[in] float` input value.
+
+```c
+float stdlib_base_fast_absf( const float x );
+```
+
+</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/fast/absf.h"
+#include <stdio.h>
+
+int main( void ) {
+    const float x[] = { 3.14f, -3.14f, 0.0f, 0.0f/0.0f };
+
+    float y;
+    int i;
+    for ( i = 0; i < 4; i++ ) {
+        y = stdlib_base_fast_absf( x[ i ] );
+        printf( "|%f| = %f\n", x[ i ], y );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+* * *
+
+## See Also
+
+-   <span class="package-name">[`@stdlib/math/base/special/absf`][@stdlib/math/base/special/absf]</span><span class="delimiter">: </span><span class="description">compute the absolute value of a single-precision floating-point number.</span>
+
+</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">
+
+[absolute-value]: https://en.wikipedia.org/wiki/Absolute_value
+
+[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
+
+<!-- <related-links> -->
+
+[@stdlib/math/base/special/absf]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/absf
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/math/base/special/fast/absf/benchmark/benchmark.js

@@ -0,0 +1,55 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2020 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 pkg = require( './../package.json' ).name;
+var absf = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+
+	x = uniform( 100, -500.0, 500.0, {
+		'dtype': 'float32'
+	});
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = absf( x[ i % x.length ] );
+		if ( isnan( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( y ) ) {
+		b.fail( 'should not return NaN' );
+	} else {
+		b.pass( 'benchmark finished' );
+	}
+	b.end();
+});

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

@@ -0,0 +1,64 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2020 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/array/uniform' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var absf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( absf instanceof Error )
+};
+
+
+// MAIN //
+
+bench( pkg+'::native', opts, function benchmark( b ) {
+	var x;
+	var y;
+	var i;
+
+	x = uniform( 100, -500.0, 500.0, {
+		'dtype': 'float32'
+	});
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = absf( x[ i % x.length ] );
+		if ( isnan( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( y ) ) {
+		b.fail( 'should not return NaN' );
+	} else {
+		b.pass( 'benchmark finished' );
+	}
+	b.end();
+});