1Code in this sub-directory should follow the GNU Coding Standard, but it is 2not expected to be upstreamed into glibc without modification, so 3glibc-specific conventions need not be followed. 4 5The requirements for portable code apply to non-portable code with the 6following differences: 7 8 91. Worst-case ULP error should be encoded in filenames (e.g. sin_u35.c). There 10 are no specific restrictions on acceptable ULP error, but if functions 11 provide significantly less accuracy than portable equivalents then a clear 12 justification for inclusion should be stated in comments at the top of the 13 source file. Error bounds of the approximation should be clearly documented 14 in comments. 15 162. Functions are assumed to support round-to-nearest mode by default, unless 17 stated; other rounding modes are not required to be provided. 18 193. Handling of special cases may be relaxed for vector functions. Checking 20 whether each vector lane contains special values such as NaN, Inf or 21 denormal numbers can prove too costly for vector functions. This is often 22 not required since vector functions are typically used along with aggressive 23 compiler optimization flags. 24