On 22 January 2014 00:03, Tom Hughes <t...@compton.nu> wrote: > On 21/01/14 21:49, Tina Harriott wrote: > >> I am new to this list. Can anyone guide me dissect a problem with >> valgrinds long double fp math on x86-64 cpus? We're getting major >> malfunctions in our applications because any long double operation >> (say y=sinl(x)) contains rubbish in the least significant bits. > > See the "Limitations" section of the manual: > > http://www.valgrind.org/docs/manual/manual-core.html#manual-core.limits > > Specifically the section about floating point limitations.
"...Whether or not this is critical remains to be seen..." Yeah, that comment is so 'funny' that it hurts again. The difference between 64bit math and 80bit math is whether a MBDA Meteor missile will hit its target or not (Michael Östergren holds a personal grudge against valgrind because of weeks lost due this particular embarrassing bug screwing up simulations btw), whether the beams in LHC will meet the (intended!) target or not, whether math in SAS software works or not (warranting a warning in the written documentation that running with valgrind to test 3rd party plugins is not supported). So the list of things which do *NOT* work with valgrind is *impressive* and hurt high value projects, IMHO warranting at least the removal of that mocking comment "...Whether or not this is critical remains to be seen...". Please. Lionel ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
