[LLVMdev] Fw: Forcing the Interpreter segfaults

[Török Edwin]

[I assume you meant to send this to the list as well, not just me.]

Begin forwarded message:

Date: Wed, 3 Nov 2010 14:43:54 +0000
From: Salomon Brys <salomon.brys at gmail.com>
To: Török Edwin <edwintorok at gmail.com>
Subject: Re: [LLVMdev] Forcing the Interpreter segfaults


I have build LLVM in debug mode. Here are the informations of the
segfault : memcpy() at 0x7ffff6f6581e
 LoadIntFromMemory() at ExecutionEngine.cpp:887 0xb3c297
llvm::ExecutionEngine::LoadValueFromMemory() at ExecutionEngine.cpp:915
0xb3c3f9
 llvm::Interpreter::visitLoadInst() at Execution.cpp:812 0xa1f855
llvm::InstVisitor<llvm::Interpreter, void>::visitLoad() at 0xa28357
 llvm::InstVisitor<llvm::Interpreter, void>::visit() at 0xa26b4e
llvm::Interpreter::run() at Execution.cpp:1,328 0xa235ff
 llvm::Interpreter::runFunction() at Interpreter.cpp:95 0xa166fa
....
So the segfaults happens because of the memcpy call in the
LoadIntFromMemory function in ExecutionEngine.cpp on line 887... Any
clue ?


Adding .setOptLevel(llvm::CodeGenOpt::None) to the EngineBuilder
creation reduces the time by 25% but that is still not enough :(


2010/11/3 Török Edwin <edwintorok at gmail.com>

> On Wed, 3 Nov 2010 11:18:34 +0000
> Salomon Brys <salomon.brys at gmail.com> wrote:
>
> > Jiting with no optimization does not reduce significantly the
> > compilation with very small code...
>
> I mean the parameter to createJIT, OptLevel. Try setting it to None.
> Or if you use EngineBuilder, setOptLevel(CodeGenOpt::None).
>
> > What is the local register allocator ???
>
> -regalloc=fast, or -regalloc=local parameter to llc, or lli.
> I think there was a programatic way to choose register allocator, but
> I forgot how.
>
> Best regards,
> --Edwin
>



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