[LLVMdev] LLVM 3.3 JIT code speed

David Tweed david.tweed at arm.com
Fri Jul 19 02:43:10 PDT 2013


| And since the 1) DSL  ==> C/C++  ===> clang/gcc -03 ===> exec  code chain
has the "correct" speed, there is no reason the JIT based one should be
slower right? 

| So I still guess something is wrong in the way we use the JIT and/or some
LTO issue possibly?

When you say "slower" wrt 3.1 on LLVM and the same speed for clang, could
you put some rough time numbers on things for some fixed testcode for your
DSL? Obviously they won't have an absolute meaning, but the order of
magnitude relative to the normal execution times might guide the ideas about
what it could be.


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