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use frexp and ldexp in FastMath #471

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merged 1 commit into from
Dec 17, 2023
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@BenWibking BenWibking commented Dec 15, 2023

Description

This avoids reinterpret_cast in FastMath.hpp, which is undefined behavior. Instead, we use ldexp and frexp to manipulate the floating-point mantissa and exponent for the fast approximate log functions.

Related issues

Fixes #333.

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Before this pull request can be reviewed, all of these tasks should be completed. Denote completed tasks with an x inside the square brackets [ ] in the Markdown source below:

  • I have added a description (see above).
  • I have added a link to any related issues see (see above).
  • I have read the Contributing Guide.
  • I have added tests for any new physics that this PR adds to the code.
  • I have tested this PR on my local computer and all tests pass.
  • I have manually triggered the GPU tests with the magic comment /azp run.
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/azp run

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Azure Pipelines successfully started running 4 pipeline(s).

@BenWibking BenWibking added this pull request to the merge queue Dec 17, 2023
Merged via the queue into development with commit ed90651 Dec 17, 2023
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@BenWibking BenWibking deleted the BenWibking/fix-fastmath-ub branch December 17, 2023 15:37
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update FastMath to use std::frexp and std::ldexp
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