feat: add C implementation for math/base/special/pow

[aman-095]

Resolves #1656.

Description

What is the purpose of this pull request?

This RFC proposes adding native C implementation for @stdlib/math/base/special/pow

double stdlib_base_pow( const double b, const double x )

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: Add C implementation for @stdlib/math/base/special/pow #1656
• fixes #

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

---

@stdlib-js/reviewers

[aman-095]

There is some minor error that is leading to test failure. Can you please check the implementation? CC @kgryte @Pranavchiku @Planeshifter

[aman-095]

@kgryte @Pranavchiku all tests, examples, and benchmarks work well locally. Don't know why CI is failing. Please review.

[aman-095]

CC @kgryte @Pranavchiku all tests work well locally. Don't know why tests are failing here.

[Planeshifter]

The discrepancy in test cases arise from floating-point operation fusing (see clang.llvm.org/docs/UsersManual.html#cmdoption-ffp-contract), where multiple floating-point operations are combined into a single operation.

See prior discussion here: #2298 (comment)

When compiling the add-on with this optimization disabled via

CFLAGS="-ffp-contract=off" NODE_GYP_FLAGS="" make install-node-addons NODE_ADDONS_PATTERN="math/base/special/pow"

all test cases match the results from the test fixtures.

[Pranavchiku]

Woah! we finally got pow knocked out!