24 lines
1.1 KiB
Plaintext
24 lines
1.1 KiB
Plaintext
Code in this sub-directory should follow the GNU Coding Standard, but it is
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not expected to be upstreamed into glibc without modification, so
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glibc-specific conventions need not be followed.
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The requirements for portable code apply to non-portable code with the
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following differences:
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1. Worst-case ULP error should be encoded in filenames (e.g. sin_u35.c). There
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are no specific restrictions on acceptable ULP error, but if functions
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provide significantly less accuracy than portable equivalents then a clear
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justification for inclusion should be stated in comments at the top of the
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source file. Error bounds of the approximation should be clearly documented
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in comments.
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2. Functions are assumed to support round-to-nearest mode by default, unless
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stated; other rounding modes are not required to be provided.
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3. Handling of special cases may be relaxed for vector functions. Checking
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whether each vector lane contains special values such as NaN, Inf or
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denormal numbers can prove too costly for vector functions. This is often
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not required since vector functions are typically used along with aggressive
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compiler optimization flags.
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