#2917: alloca and allocaArray do not respect alignment
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Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Milestone: _|_
Component: Compiler (FFI) | Version: 6.12.3
Resolution: | Keywords:
Testcase: | Blockedby:
Difficulty: Unknown | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: None/Unknown |
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Changes (by Lemming):
* cc: g...@… (added)
Comment:
Replying to [comment:22 simonmar]:
> Taking it off the milestone. The only remaining things to do are
`malloc` and `mallocBytes`: these use C malloc, which satisfies the
minimum alignment requirement for any native datatype, so there shouldn't
be a problem in most cases.
On my machine the 'malloc' manpage says, that 'malloc' aligns correctly
for any variable, but apparently it does not. Maybe the statement was true
before the 16-byte vectors of SSE. We are not the first ones who use SSE,
how could the problem be missed by the kernel developers? So I'm uncertain
whether the behaviour of 'malloc' is intended or not and thus whether we
should fix Haskell libraries or the Linux kernel.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2917#comment:24>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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