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Re: glibc 2.2: math test failures


From: Michael Deutschmann
Subject: Re: glibc 2.2: math test failures
Date: Sun, 29 Apr 2001 22:14:52 -0700 (PDT)

> > 2.2.1 is not yet releases.  Once it is I meant.

Seems I was distracted by other things at the time 2.2.1 and even 2.2.2 was
released.  But I've finally gotten around to recompiling and retesting.

The math errors are gone (or at least suppressed).  However, the test 
failures related to Linux 2.2 features (LFS and one AIO test) still 
continue.  You should suppress these tests on Linux 2.0 systems, or at 
least mentioned it in your FAQ.  (I haven't retested the 386).

(While you're at it, you could also mention that at least one test,
tst-chmod.out, fails intermittently when the test is run on one computer 
using NFS to access the build tree of another.  I'm pretty sure that is 
all NFS's fault.

Yes, I know NFS is slow, but sometimes I'm forced to use it to run tests
on a computer without enough free diskspace for a glibc build.)

Also, you never answered my question about the math tolerance.  How high
does the worst-known error on a math function have to get before you'll fix
the problem at nontrivial cost rather than just document it?

Or did you mean, by your complaints of not enough interested programmers,
that you would insist on < 0.5 ULP if you only had the capacity?  (so
if I submitted a replacement function that was provably correct but
1,000,000 times slower than the buggy status quo, it would be accepted.)

---- Michael Deutschmann <address@hidden>



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