feat: add math/base/special/exp2f

lib/node_modules/@stdlib/math/base/special/exp2f/LICENSE

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+DEPENDENCIES & ATTRIBUTION
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+The library links against the following external libraries or contains
+implementations from the following external libraries, which have their own
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+* Cephes <http://www.netlib.org/cephes/readme>
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+Stephen L. Moshier
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lib/node_modules/@stdlib/math/base/special/exp2f/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2025 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.
+
+-->
+
+# exp2f
+
+> Base `2` [exponential function][exponential-function] in single-precision floating-point format.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var exp2f = require( '@stdlib/math/base/special/exp2f' );
+```
+
+#### exp2f( x )
+
+Evaluates the base `2` [exponential function][exponential-function] in single-precision floating-point format.
+
+```javascript
+var v = exp2f( 3.0 );
+// returns 8.0
+
+v = exp2f( -9.0 );
+// returns ~0.002
+
+v = exp2f( 0.0 );
+// returns 1.0
+
+v = exp2f( NaN );
+// returns NaN
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var logEachMap = require( '@stdlib/console/log-each-map' );
+var randu = require( '@stdlib/random/array/uniform' );
+var exp2f = require( '@stdlib/math/base/special/exp2f' );
+
+var x = randu( 100, -50.0, 50.0, {
+    'dtype': 'float32'
+});
+
+logEachMap( '2^%d = %d', x, exp2f );
+```
+
+</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/exp2f.h"
+```
+
+#### stdlib_base_exp2f( x )
+
+Evaluates the base `2` [exponential function][exponential-function] in single-precision floating-point format.
+
+```c
+float out = stdlib_base_exp2f( 3.0f );
+// returns 8.0f
+
+out = stdlib_base_exp2f( -9.0f );
+// returns ~0.002f
+```
+
+The function accepts the following arguments:
+
+-   **x**: `[in] float` input value.
+
+```c
+float stdlib_base_exp2f( 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/exp2f.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+int main( void ) {
+    float x;
+    float v;
+    int i;
+
+    for ( i = 0; i < 100; i++ ) {
+        x = ( ( (float)rand() / (float)RAND_MAX ) * 100.0f ) - 50.0f;
+        v = stdlib_base_exp2f( x );
+        printf( "2^%f = %f\n", x, v );
+    }
+}
+```
+
+</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">
+
+[exponential-function]: https://en.wikipedia.org/wiki/Exponential_function
+
+<!-- <related-links> -->
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->