add Float::log

[tonyfettes]

This PR add log function to Float

[coderabbitai]

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[peter-jerry-ye-code-review]

From the provided git diff output, here are three potential issues or improvements I've identified:

1. Potential Redundancy in log.mbt:

   let logf_off = 0x3f330000U
   

   This line defines a constant logf_off which is used to offset the floating-point representation during logarithm computation. While this is a valid approach, ensure that this offset is necessary and not a duplicate computation of a more fundamental constant used elsewhere in the library (e.g., a predefined constant for the midpoint of a significant range).

2. Type Conversion Issues in log.mbt:

   let z = iz.reinterpret_as_int().reinterpret_as_float().to_double()
   

   This line involves a series of type reinterpretations and conversions. While this is a valid technique in MoonBit for converting types, it's crucial to ensure that these conversions do not introduce precision loss or unexpected behavior, especially since the floating-point operations are sensitive to such issues. Consider adding comments explaining why this sequence of conversions is necessary and ensuring thorough testing to catch any potential issues.

3. Error Handling in log.mbt:

   if ix == 0x7f800000U {
       return self
   }
   

   This condition checks if the input to the ln function is positive infinity. While returning self (which is positive infinity) seems appropriate, consider adding a more explicit handling mechanism or a comment explaining why returning the input directly is the correct approach for this edge case. This could improve readability and maintainability, especially for developers less familiar with the specific nuances of floating-point arithmetic.

These suggestions aim to enhance readability, maintainability, and correctness of the code, ensuring that the implementation adheres to best practices and handles edge cases appropriately.

[coveralls]

Pull Request Test Coverage Report for Build 3297

Details

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 83.208%

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Totals
Change from base Build 3288:	0.02%
Covered Lines:	4088
Relevant Lines:	4913

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💛 - Coveralls