search for: have_log1p

...;> platform to test it, though. I need the same kind of test in my own software, so I made some experiments and came up with the code below for configure.in. I've tested it so far only on NetBSD 1.6 and Sun Solaris 9; it produced the expected settings #define HAVE_BROKEN_LOG1P 1 #define HAVE_LOG1P 1 on NetBSD and /* #undef HAVE_BROKEN_LOG1P */ #define HAVE_LOG1P 1 on Solaris. Notice that the test code checks arguments over a range of powers of two suitable for IEEE 754 with support for subnormals, but will bail out early if necessary. It should therefore work as intended on VAX OpenVM...

...52210118e-31 0.000000000000000e+00 The whole point of log1p(x) is to return accurate results for |x| << 1, and the OpenBSD/FreeBSD folks failed to understand that. The simple solution for a missing log1p() that I adopted in hoc is this internal function: fp_t Log1p(fp_t x) { #if defined(HAVE_LOG1PF) || defined(HAVE_LOG1P) || defined(HAVE_LOG1PL) return (log1p(x)); #else fp_t u; /* Use log(), corrected to first order for truncation loss */ u = FP(1.0) + x; if (u == FP(1.0)) return (x); else return (log(u) * (x / (...

...define HAVE_EXPM1 1 | #define HAVE_FCNTL 1 | #define HAVE_FINITE 1 | #define HAVE_FSEEKO 1 | #define HAVE_FTELLO 1 | #define HAVE_FTRUNCATE 1 | #define HAVE_GETCWD 1 | #define HAVE_GETGRGID 1 | #define HAVE_GETPWUID 1 | #define HAVE_GETUID 1 | #define HAVE_HYPOT 1 | #define HAVE_ISASCII 1 | #define HAVE_LOG1P 1 | #define HAVE_MATHERR 1 | #define HAVE_MKFIFO 1 | #define HAVE_POPEN 1 | #define HAVE_PUTENV 1 | #define HAVE_RINT 1 | #define HAVE_SETENV 1 | #define HAVE_STRCOLL 1 | #define HAVE_STAT 1 | #define HAVE_STRPTIME 1 | #define HAVE_SYMLINK 1 | #define HAVE_SYSTEM 1 | #define HAVE_TIMES 1 | #define...

...define HAVE_EXPM1 1 | #define HAVE_FCNTL 1 | #define HAVE_FINITE 1 | #define HAVE_FSEEKO 1 | #define HAVE_FTELLO 1 | #define HAVE_FTRUNCATE 1 | #define HAVE_GETCWD 1 | #define HAVE_GETGRGID 1 | #define HAVE_GETPWUID 1 | #define HAVE_GETUID 1 | #define HAVE_HYPOT 1 | #define HAVE_ISASCII 1 | #define HAVE_LOG1P 1 | #define HAVE_MATHERR 1 | #define HAVE_MKFIFO 1 | #define HAVE_POPEN 1 | #define HAVE_PUTENV 1 | #define HAVE_RINT 1 | /* end confdefs.h. */ | /* Define setenv to an innocuous variant, in case <limits.h> declares setenv. | For example, HP-UX 11i <limits.h> declares gettimeofday....