I'm not alone! FWIW, I still have that problem in 5.2.0.6. And I confirm the ".1" minimalist test case.
When running 'racket' from the command line, this does not occur however: laurent:~$ racket Welcome to Racket v5.2.0.6. Edit ~/.racketrc to modify inits. > .1 0.1 > But this still happens with gracket: Welcome to Racket v5.2.0.6. This is a simple window for evaluating Racket expressions. Quit now and run DrRacket to get a better window. The current input port always returns eof. > .1 0.0 > Probably irrelevant: Could the GPU be in the loop somehow? Good luck, Laurent On Tue, Dec 27, 2011 at 14:26, Marijn <[email protected]> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 24-12-11 16:23, Matthew Flatt wrote: > > At Wed, 14 Dec 2011 16:49:23 +0100, Marijn wrote: > >> #lang racket (* .1 pi) > >> > >> produces 0.0 reliably in a freshly started drracket even when > >> rerunning it, but: > >> > >> $ racket -e '(* .1 pi)' 0.3141592653589793 > >> > >> and the program: > >> > >> #lang racket pi (* .1 pi) > >> > >> on the first run (drracket again) produces: > >> > >> 3.141592653589793 0.0 > >> > >> while on subsequent runs it produces: > >> > >> 3.141592653589793 0.3141592653589793 > > > > Thanks --- this is very helpful! > > > > I'm still stumped, unfortunately. It looks the same as PR 12070, > > which we never figured out: > > > > > http://bugs.racket-lang.org/query/?debug=&database=default&cmd=view+audit-trail&cmd=view&pr=12070 > > Interesting!, > > > though it is a bit hard to read the Audit Trail because > everything is jumbled together. > > I reproduce that bug and step 7) and 8) can be replaced with a single > re-evaluate for me. > > It seems to indicate very clearly that the problem is in the floating > point start-up somehow and has nothing to do with `pi' or variable > references. > > Another possibility would be that multiplication (*) was at fault, but > my new smallest test-case rules that out: > > #lang racket > .1 > > => 0.0 > > And actually it works also directly in the REPL without running any > program: > > Welcome to DrRacket, version 5.2.0.7--2011-12-15(-/f) [3m]. > Language: racket; memory limit: 128 MB. > > .1 > 0.0 > > 1 > 1 > > .1 > 0.0 > > .2 > 0.0 > > .3 > 0.0 > > .4 > 0.0 > > .5 > 0.0 > > .6 > 0.0 > > .7 > 0.0 > > .8 > 0.0 > > .9 > 0.0 > > 1.0 > 1.0 > > .1 > 0.1 > > So should we look at the byte-code produced for this (how does one do > that and what is the expected code)? > Is there some way to invoke racket from the command line in such a way > that it behaves like the drracket initial repl? > How does one run the byte-code? > > What external suspects are there? I suppose gcc, but are there any > other? My CFLAGS are set to a very conservative AFAIK > CFLAGS="-march=native -ggdb -O2 -pipe", currently on version 4.5.3. > > Marijn > > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.18 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > iEYEARECAAYFAk75x5IACgkQp/VmCx0OL2xZRACcC8dubYCSNXScyOG8wdJQxxN1 > xAgAnRVKv8YpTWODEKn2qEMMhcXHZLSk > =n+xT > -----END PGP SIGNATURE----- >
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