#2917: alloca and allocaArray do not respect alignment
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Reporter: guest | Owner:
Type: bug | Status: new
Priority: high | Milestone: 6.10.2
Component: Compiler (FFI) | Version: 6.10.1
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: x86 |
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Comment (by guest):
The mallocAlignment is the alignment returned by C malloc(), the
allocaAlignment is the alignment for ghc's heap based allocation. I
should have spelled that out.
Those two things should not be numbers, of course, but determined by the
configure script.
yes, OS X malloc() works fine, but ghc's internal allocation fails since
it allocates on 8 byte boundary.
I don't want to rush this in either. But the bug makes large parts of the
FFI library unusable with LLVM, so I'd like some fix. How about a band
aid that changes ghc's internal alloca to 16 byte boundary? That will
make things work, and we have a chance to test my patch further.
-- Lennart
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2917#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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