On 2013-09-25 06:59, Vasily Golubev wrote: > It may be helpful to test Valgrind's trunk from svn repository, at first.
I am sure this would be a very quick test for you. For me this would be a lot of work as I don't have a trunk version of valgrind handy. Cheers, Peter. > On Tue, Sep 24, 2013 at 7:55 PM, John Reiser <jrei...@bitwagon.com> wrote: >>> __float128 exp10(__float128); >>> >>> When that routine is called with a negative argument, the return value >>> changes when I run the code through valgrind, e.g. >>> >>> -20 3fbc79ca10c9242235d511e976394d7a (without valgrind) >>> -20 3fbc79ca10c9240e12445f2000000000 (with valgrind) >>> >>> The -20 is the argument for exp10() and was obviously converted to >>> __float128, and the return value is printed here in hex format. >>> Initially I thought that the lowest 64 bits were mangled, but from this >>> example you can see that it is a bit more (the lowest 70 bits differ). >> >> This is a bug in memcheck. Please file a bug report. >> Construct a short test case program (15 lines or so) >> which reproduces the output above. Then go to the main page >> http://www.valgrind.org/ , click on the Bug Reports link >> (left column under Contact), describe the problem (much as above), >> copy+paste the output, and attach the test case program. >> Please also include the versions of valgrind, compiler, C/math library, >> and operating system; and kind of hardware. >> Thank you. >> >> -- >> >> >> ------------------------------------------------------------------------------ >> October Webinars: Code for Performance >> Free Intel webinars can help you accelerate application performance. >> Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from >> the latest Intel processors and coprocessors. See abstracts and register > >> http://pubads.g.doubleclick.net/gampad/clk?id=60133471&iu=/4140/ostg.clktrk >> _______________________________________________ >> Valgrind-users mailing list >> Valgrind-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/valgrind-users > > > -- Peter van Hoof Royal Observatory of Belgium Ringlaan 3 1180 Brussel Belgium http://homepage.oma.be/pvh ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60133471&iu=/4140/ostg.clktrk _______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
