[SciPy-User] testieee NaN arithmetic did not perform per ieee spec with ifort

Jerome Kieffer Jerome.Kieffer@esrf...
Sat Sep 8 01:51:20 CDT 2012


On Fri, 7 Sep 2012 16:16:24 -0700
"K.-Michael Aye" <kmichael.aye@gmail.com> wrote:

> Dear all,
> 
> compiling the lapack 3.4.1 with Intel's ifort compiler results in the 
> test program "testieee" not passing the NaN test:
> 
> "NaN arithmetic did not perform per the ieee spec"
> 
> When compiled with gfortran it passes this test.
> Should I worry? Will the ifort compile work so much faster that it's 
> worth the little worry? (I will be working a lot with data binnings and 
> griddings, interpolations, fittings…)

one should always use "-mp" option in intel compiler suite to have "more precise" math, i.e. ieee compliant math.

Then one realizes intel compiler are not that faster than gcc (but still a bit)

Cheers,
-- 
Jérôme Kieffer
Data analysis unit - ESRF

PS: -mp could have changed it's name since icc 10


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