#1944: round function causes cblas NaNs
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Reporter: SevenThunders | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 6.8.3
Component: Compiler | Version: 6.8.1
Severity: critical | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: x86
Os: Windows |
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Comment (by SevenThunders):
I have tested this bug now with an entirely different cblas, namely the
acml library distributed by AMD. Although my simplified test case
compiles and runs correctly for the acml library, when the library is
linked against my complex numerical application, NaNs proliferate
everywhere in ghc 6.8.2. This happens for both the single and multiple
threaded cblas code. Hopefully I won't need to generate a test case for
the acml library.
If I compile it with ghc 6.6.1 it works fine. I'd say this is a pretty
serious bug and I'm surprised that it hasn't appeared in other
applications and other bug reports. I simply would not trust any external
floating point library that has been linked into ghc 6.8.2. I've
replicated the bug now on two different windows machines, one AMD and one
core duo, and with three different cblas libraries.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1944#comment:6>
GHC <http://www.haskell.org/ghc/>
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