feat: add math/base/special/kernel-log1pf

lib/node_modules/@stdlib/math/base/special/kernel-log1pf/LICENSE

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lib/node_modules/@stdlib/math/base/special/kernel-log1pf/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.
+
+-->
+
+# kernelLog1pf
+
+> Compute `logf(1+f) - f` for `1+f` in `~[sqrtf(2)/2, sqrtf(2)]`.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var kernelLog1pf = require( '@stdlib/math/base/special/kernel-log1pf' );
+```
+
+#### kernelLog1pf( f )
+
+Computes `logf(1+f) - f` for `1+f` in `~[sqrtf(2)/2, sqrtf(2)]`.
+
+```javascript
+var v = kernelLog1pf( 1.0 );
+// returns ~0.1931
+
+v = kernelLog1pf( 1.4142135623730951 );
+// returns ~0.4672
+
+v = kernelLog1pf( NaN );
+// returns NaN
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   This function is a helper function for computing logarithms in base `e`. Argument reduction and adding the final term of the polynomial must be done by the caller for increased accuracy when different bases are used. For reference, see [`@stdlib/math/base/special/log2f`][@stdlib/math/base/special/log2f] and [`@stdlib/math/base/special/log10f`][@stdlib/math/base/special/log10f].
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var linspace = require( '@stdlib/array/base/linspace' );
+var sqrt = require( '@stdlib/math/base/special/sqrt' );
+var kernelLog1pf = require( '@stdlib/math/base/special/kernel-log1pf' );
+
+var x = linspace( sqrtf( 2.0 ) / 2.0, sqrtf( 2.0 ), 100 );
+
+var i;
+for ( i = 0; i < x.length; i++ ) {
+    console.log( 'kernelLog1pf(%d) = %d', x[ i ], kernelLog1pf( x[ i ] ) );
+}
+```
+
+</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/kernel_log1pf.h"
+```
+
+#### stdlib_base_kernel_log1pf( f )
+
+Computes `logf(1+f) - f` for `1+f` in `~[sqrtf(2)/2, sqrtf(2)]`.
+
+```c
+float out = stdlib_base_kernel_log1pf( 1.0f );
+// returns ~0.1931f
+```
+
+The function accepts the following arguments:
+
+-   **f**: `[in] float` input value.
+
+```c
+float stdlib_base_kernel_log1pf( const float f );
+```
+
+</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/kernel_log1pf.h"
+#include <stdio.h>
+
+int main( void ) {
+    const float x[] = { 0.7071f, 0.7856f, 0.8642f, 0.9428f, 1.0213f, 1.0999f, 1.1785f, 1.2570f, 1.3356f, 1.4142f };
+
+    float out;
+    int i;
+    for ( i = 0; i < 10; i++ ) {
+        out = stdlib_base_kernel_log1pf( x[ i ] );
+        printf ( "x[ i ]: %f, out: %f\n", x[ i ], out );
+    }
+}
+```
+
+</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/log1p`][@stdlib/math/base/special/log1p]</span><span class="delimiter">: </span><span class="description">evaluate the natural logarithm of 1+x.</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">
+
+[@stdlib/math/base/special/log2f]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/log2f
+
+[@stdlib/math/base/special/log10f]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/log10f
+
+<!-- <related-links> -->
+
+[@stdlib/math/base/special/log1p]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/math/base/special/log1p
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->