[LLVMdev] LLVM from .NET

[Jon Harrop]

I've fixed one problem. LLVM was falling back to its IR interpreter because
the native target was not initialized correctly. The solution is to call the
following three functions in turn:

LLVMInitializeX86TargetInfo
LLVMInitializeX86Target
LLVMInitializeX86TargetMC

Cheers,
Jon.

> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
> Behalf Of Jon Harrop
> Sent: 04 March 2012 15:39
> To: llvmdev at cs.uiuc.edu
> Subject: [LLVMdev] LLVM from .NET
> 
> I've been struggling to get LLVM to work from .NET using the llvm-fs
bindings for
> the past few weeks. I finally found an installation procedure that works
and
> documented it here:
> 
> http://fsharpnews.blogspot.com/2012/03/using-llvm-from-f-under-
> windows.html
> 
> The good news is that I have that program compiling the Fibonacci function
and
> executing it from F# all via LLVM.
> 
> However, I still have a couple of problems. Firstly, I was getting "stack
> unbalanced" warnings from the managed debugging assistant when I run a
> debug build. I managed to fix them on my (x86 Vista) desktop by specifying
the
> Cdecl calling convention but the warnings persist on my (x86 Win 7)
netbook.
> Secondly, the performance is awful which (IIRC) is probably because the
native
> target has not been initialized correctly and LLVM is falling back to the
IR
> interpreter. Keith Sheppard used a hack to call LLVMInitializeX86Target
but that
> hasn't done the trick and I cannot figure out how to call the correct
> LLVMInitializeNativeTarget function from .NET.
> 
> Does anyone know the solutions to these problems or, better yet, have a
pre-
> existing .NET binding to LLVM where everything just works effortlessly?
> 
> FWIW, I tried running Microsoft's PInvoke Interop Assistant on
LLVM-3.0.dll in
> an attempt to generate .NET bindings automatically but it chokes on the
DLL.
> 
> --
> Dr Jon Harrop, Flying Frog Consultancy Ltd.
> http://www.ffconsultancy.com
> 
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