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musl - an implementation of the standard library for Linux-based systems
method: if there is a large difference between the scale of x and y then the larger magnitude dominates, otherwise reduce x,y so the argument of sqrt (x*x+y*y) does not overflow or underflow and calculate the argument precisely using exact multiplication. If the argument has less error than 1/sqrt(2) ~ 0.7 ulp, then the result has less error than 1 ulp in nearest rounding mode. the original fdlibm method was the same, except it used bit hacks instead of dekker-veltkamp algorithm, which is problematic for long double where different representations are supported. (the new hypot and hypotl code should be smaller and faster on 32bit cpu archs with fast fpu), the new code behaves differently in non-nearest rounding, but the error should be still less than 2ulps. ld80 and ld128 are supported |
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WHATSNEW |
musl libc - a new standard library to power a new generation of Linux-based devices. musl is lightweight, fast, simple, free, and strives to be correct in the sense of standards-conformance and safety. musl is an alternative to glibc, eglibc, uClibc, dietlibc, and klibc. For reasons why one might prefer musl, please see the FAQ and libc comparison chart on the project website, http://www.musl-libc.org/ For installation instructions, see the INSTALL file. Please refer to the COPYRIGHT file for details on the copyright and license status of code included in musl (standard MIT license). Greetings! The 0.9.x release series for musl features interface 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. As the release series progresses, we are gradually adding support for incomplete functionality in existing interfaces, additional functions that are deemed to be important due to their use in real-world software, and support for new library and language features in C11 such as thread-local storage, which is now supported on all targets. In addition, support for additional target cpu architectures is being added. The number of packages build successfully against musl - either out-of-the-box or with minor patches to address portability errors - has exceeded 5000 and is steadily growing. In addition to application compatibility testing, unit testing has been conducted using three separate test frameworks and numerous additional standalone test cases to verify the correctness of the implementation. Included with this package is a gcc wrapper script (musl-gcc) which allows you to build musl-linked programs using an existing gcc 3.x or 4.x toolchain on the host. There are also now at several mini distributions (in the form of build scripts) which provide a self-hosting musl-based toolchain and system root. These are much better options than the wrapper script if you wish to use dynamic linking or build packages with many library dependencies. See the musl website for details. The musl project is actively seeking contributors, mostly in the areas of porting, testing, and application compatibility improvement. For bug reports, support requests, or to get involved in development, please visit #musl on Freenode IRC or subscribe to the musl mailing list by sending a blank email to musl-subscribe AT lists DOT openwall DOT com. Thank you for using musl. Cheers, Rich Felker / dalias