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