(gitlab is uusable; i have to report here.) ecl 21.2.1 gives:
(log 1/6319748715279270675921934218987893281199411530039296)
Debugger received error of type: DIVISION-BY-ZERO #<a DIVISION-BY-ZERO 0x7ff5afe6c540> Error flushed. whereas other cl's (i testyed sbcl and ccl) give results like: ? (log 1/6319748715279270675921934218987893281199411530039296) -119.27552 I tested on amd64 (gentoo) and arm64 (debian and netbsd) with identical results. i did not have a musl box or other bsd to test on. run with --no-trap-fpe, the result is #<single-float negative infinity>. another example is: (truncate (log 1/6319748715279270675921934218987893281199418867)) Debugger received error of type: ARITHMETIC-ERROR #<a ARITHMETIC-ERROR 0xffff8f688a40> whereas this works: (truncate (log 1/631974871527927067592193421898789328119941867)) -103 -0.27893066 which of course suggests that the issue is c's long double's precision. it looks like ecl could use an mpq log function; https://github.com/linas/anant might work. -JimC -- James Cloos <cloos@jhcloos.com> OpenPGP: 0x997A9F17ED7DAEA6