[LLVMdev] JIT Optimization Levels?

[Nyx]

I was simply surprised because some C++ code I implemented/translated into
LLVM IR ran significantly slower in the JIT than the C++ version. The code
in question was mean to implement the "plus" operator in my scripting
language, and had different behaviors depending on the type of the objects
being added.  I expected it to run faster as I was eliminating a call to a
C++ function by generating the LLVM IR for what I wanted to do directly,
essentially inlining the code for the "plus" operator into the code I was
generating/JITing.


Evan Cheng-2 wrote:
> 
> 
> On Mar 27, 2009, at 2:47 PM, Nyx wrote:
> 
>>
>> Hello,
>>
>> Is there a way to control how optimized the x86 code generated by  
>> the JIT
>> is? I mean the actual x86 code, not the llvm IR (I know about those
>> optimization passes). I would like to make it as optimized as  
>> reasonably
>> possible.
> 
> Then the default is what you want. By default, all the codegen  
> optimizations are being run.
> 
> Evan
> 
>>
>>
>> Thank you for your time,
>>
>> - Maxime
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