[LLVMdev] appropriate for run-time compilation of DSL?

Kenneth Uildriks kennethuil at gmail.com
Tue Apr 12 09:41:38 PDT 2011

Is it fairly easy to compile LLVM itself to bytecode (perhaps with the
gold plugin)?  If so, there might be a combo of whole-program
optimizations that might help JIT time.

On Tue, Apr 12, 2011 at 11:25 AM, Reid Kleckner <reid.kleckner at gmail.com> wrote:
> On Mon, Apr 11, 2011 at 11:37 PM, edA-qa mort-ora-y <eda-qa at disemia.com> wrote:
>>> There isn't great support for this in the LLVM JIT, but IIRC some
>>> clients have managed this by subclassing the JITMemoryManager to copy
>>> the code when the function has finished being emitted.  I don't know
>>> if it's possible to ensure that the code will be position independent.
>> I'll start my investigation here then, as this is actually quite
>> critical to us -- we can't afford the final JIT/compilation overhead on
>> our target machines. Note that I do presume that LLVM is extremely fast,
>> but our requirements sit at the microsecond level, and we will have
>> thousands of these things to compile in a day.
> Then LLVM might not be the right tool for the job.  It's not a very
> fast JIT compiler, although this is an area we'd like to improve.  To
> whether it's fast enough, you could modify the Kaleidoscope example to
> time compiling several functions.
> Reid
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