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24ebbbdedc
commit cfa0a54c082d41db6446638eed1d57f163434092 attempted to fix rounding on archs where long double is not 80-bit (where LDBL_MANT_DIG is not zero mod four), but failed to address the edge case where rounding was skipped because LDBL_MANT_DIG/4 rounded down in the comparison against the requested precision. the rounding logic based on hex digit count is difficult to understand and not well-motivated, so rather than try to fix it, replace it with an explicit calculation in terms of number of bits to be kept, without any truncating division operations. based on patch by Peter Ammon, but with scalbn to apply the rounding exponent since the value will not generally fit in any integer type. scalbn is used instead of scalbnl to avoid pulling in the latter unnecessarily, since the value is an exact power of two whose exponent range is bounded by LDBL_MANT_DIG, a small integer.
musl libc
musl, pronounced like the word "mussel", is an MIT-licensed
implementation of the standard C library targetting the Linux syscall
API, suitable for use in a wide range of deployment environments. musl
offers efficient static and dynamic linking support, lightweight code
and low runtime overhead, strong fail-safe guarantees under correct
usage, and correctness in the sense of standards conformance and
safety. musl is built on the principle that these goals are best
achieved through simple code that is easy to understand and maintain.
The 1.1 release series for musl features coverage for all interfaces
defined in ISO C99 and POSIX 2008 base, along with a number of
non-standardized interfaces for compatibility with Linux, BSD, and
glibc functionality.
For basic installation instructions, see the included INSTALL file.
Information on full musl-targeted compiler toolchains, system
bootstrapping, and Linux distributions built on musl can be found on
the project website:
http://www.musl-libc.org/