Am Sat, 25 Jun 2011 13:41:11 -0400 schrieb Frank Peters <frank.pet...@comcast.net>:
> Hello,
>
[background information]
Huh, I was unaware that GNU (since they're the authors of GCC/GLIBC) ever had
problems in this area. Since I use my machine for numerical tasks, too, I was
interested in seeing whether I would see the same problem.
> The code will take several minutes to compile, execute, and complete. While
> the test is running it will spit out its progress to stdout. Upon completion
> a brief summary is given:
>
> UCBFAIL indicates problems!
> /tmp/fp-test-results/ccos_DP.output: ucbtest UCBFAIL in COS(X) at line 444
> for generic
> /tmp/fp-test-results/clib_DP.output: ucbtest UCBFAIL in cabsd at line 701 for
> double
> /tmp/fp-test-results/clib_DP.output: ucbtest UCBFAIL in powd at line 701 for
> double
> /tmp/fp-test-results/clib_DP.output:UCBFAIL clib_DP.output , 25 out of 25
> tests completed
> /tmp/fp-test-results/csin_DP.output: ucbtest UCBFAIL in SIN(X) at line 444
> for generic
>
> only 11 out of 14 show UCBPASS!
I ran the tests without any modifications to ucbREADME/linux.sh and don't get
the cabsd failure:
UCBFAIL indicates problems!
/tmp/fp-test-results/ccos_DP.output: ucbtest UCBFAIL in COS(X) at line 444
for generic
/tmp/fp-test-results/clib_DP.output: ucbtest UCBFAIL in powd at line 701
for double
/tmp/fp-test-results/clib_DP.output:UCBFAIL clib_DP.output , 25 out of 25
tests completed
/tmp/fp-test-results/csin_DP.output: ucbtest UCBFAIL in SIN(X) at line 444
for generic
only 11 out of 14 show UCBPASS!
Out of curiosity, I ran the test two more times and got the same results.
This machine runs on stable, with a slightly older Athlon64 X2.
> There are expected failures in the trigonometric tests since trigonometric
> performance is not specified in IEEE754/854. The failure in powd (double
> power
> function) is also expected. But everything else should have passed.
Then according to the results above my machine is apparently OK. (I guess I
really should finally read about IEEE floating point more thoroughly, I've been
planning to do that for a while now.)
[...]
> Frank Peters
HTH
--
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup
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