#1944: round function causes cblas NaNs
---------------------------+------------------------------------------------
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 |
---------------------------+------------------------------------------------
Comment (by simonmar):
Presumably something in the floating-point unit state is changing in a way
that upsets the code in the cblas library. I don't know of anything that
could cause this; the native code generator does in one place generate
code that saves and restores the FPU control word, but that was added in
6.8.2 (see #1910).
To proceed we really need to know what is changing in the FPU state, so
that we can trace it back to the point at which it changed. At the very
least, we need a reproducible test case. I downloaded your files and
tried it, but it looks like I have a DLL missing:
{{{
c:\builds\atlas\Test2>maketest
c:\builds\atlas\Test2>set CLIB=atlas
c:\builds\atlas\Test2>set TopFile=Test2
c:\builds\atlas\Test2>set csrc=ctest2.c
c:\builds\atlas\Test2>set OutFile=Test2.exe
c:\builds\atlas\Test2>dlltool.exe -D atlas.dll -l atlas.lib
c:\builds\atlas\Test2>set XFLAGS=-threaded -O -XForeignFunctionInterface
c:\builds\atlas\Test2>rem set XFLAGS=-threaded -O -fffi
c:\builds\atlas\Test2>ghc -threaded -O -XForeignFunctionInterface -I.
-I..\matri
xstack --make Test2.hs ctest2.c -o Test2.exe -optl-latlas -optl-L"."
[1 of 1] Compiling Main ( Test2.hs, Test2.o )
Linking Test2.exe ...
c:\builds\atlas\Test2>Test2
c:\builds\atlas\Test2>dir
Volume in drive C has no label.
Volume Serial Number is 6041-4C23
Directory of c:\builds\atlas\Test2
03/01/2008 10:38 <DIR> .
03/01/2008 10:38 <DIR> ..
29/11/2007 02:28 5,485,456 atlas.dll
03/01/2008 10:38 1,490 atlas.lib
29/11/2007 02:28 547 ctest2.c
29/11/2007 02:28 721 ctest2.h
03/01/2008 10:38 849 ctest2.o
03/01/2008 10:37 433 index.html
29/11/2007 02:28 309 maketest.bat
03/01/2008 10:38 687,370 Test2.exe
03/01/2008 10:38 502 Test2.exe.manifest
03/01/2008 10:38 1,913 Test2.hi
29/11/2007 02:28 178 Test2.hs
03/01/2008 10:38 4,920 Test2.o
12 File(s) 6,184,688 bytes
2 Dir(s) 47,145,406,464 bytes free
c:\builds\atlas\Test2>Test2.exe
c:\builds\atlas\Test2>
}}}
Using dependency walker it looks like I don't have "MSJAVA.DLL". Although
why I need that, I have no idea.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1944#comment:7>
GHC <http://www.haskell.org/ghc/>
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