| @node log2 |
| @section @code{log2} |
| @findex log2 |
| |
| POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/log2.html} |
| |
| Gnulib module: log2 or log2-ieee |
| |
| Portability problems fixed by either Gnulib module @code{log2} or @code{log2-ieee}: |
| @itemize |
| @item |
| This function is missing on some platforms: |
| FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, older IRIX 6.5, |
| Solaris 9, MSVC 9, Android 4.2. |
| @item |
| This function is not declared on some platforms: |
| IRIX 6.5. |
| @item |
| This function is only provided as a macro on some platforms: |
| Cygwin 1.5.x. |
| @item |
| This function returns slightly wrong values for exact powers of 2 on some platforms: |
| Cygwin 1.7.9. |
| @end itemize |
| |
| Portability problems fixed by Gnulib module @code{log2-ieee}: |
| @itemize |
| @item |
| This function returns a wrong value for a negative argument on some platforms: |
| NetBSD 5.1, Solaris 10/x86_64. |
| @end itemize |
| |
| Portability problems not fixed by Gnulib: |
| @itemize |
| @end itemize |
