#948: Incorrect Core transformations with cost centres
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Reporter: simonmar | Owner:
Type: bug | Status: new
Priority: normal | Milestone: _|_
Component: Profiling | Version: 6.6
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: Multiple
Os: Multiple |
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Comment (by igloo):
Frederik Eaton in http://www.haskell.org/pipermail/glasgow-haskell-bugs
/2007-January/008125.html says:
{{{
Here is a test case showing poor results with '+RTS -xc'. The program
dies with error message:
<Wrappers.unsingleton,Main.CAF>sparse-test: Wrappers.hs:218:4-9: Assertion
failed
Clearly, the 'stack trace' is incomplete, since Wrappers is not
imported directly by the main module (so I think there should be a few
intervening levels as well).
Here are commands to reproduce:
wget http://ofb.net/~frederik/ghc-xc-test.tar.gz
tar -xzf ghc-xc-test.tar.gz
cd sparse-work
./gen-ops && ./gen-foreignimports &&
g++ -g sparse_lib.cpp -c -o sparse_lib.o &&
ghc -prof -auto-all -fno-do-eta-reduction -fno-do-lambda-eta-expansion \
-fno-case-merge -frules-off -fno-cse -fno-pre-inlining -fno-strictness \
-fno-unbox-strict-fields --make sparse-test.hs sparse_lib.o -lm -lc
-lstdc++
./sparse-test +RTS -xc
I've included all the '-fno-*' stuff on the ghc command line because I
thought it might help produce more information, but the problem occurs
without it.
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/948>
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