[LLVMdev] LLVM project binary size

[Nicolas Capens]

Hi all,

 

I'm a little bit worried about the sheer size of the resulting binaries of a
project using LLVM. The medium large project for which I'm planning to use
it (which currently uses a custom dynamic code generator), produces a
compact 1.6 MB binary. When I compile LLVM's simple 'Fibonacci' example
project the executable is 2.6 MB.

 

I realize LLVM is a complex and feature rich project but could anyone give
me a rough idea of where most of the executable size is coming from, and
maybe give some ideas on how to reduce it if possible?

 

It's not like 2.6 MB is huge but it just seems disproportionate and I'd like
to keep my project lightweight (it could be used for embedded systems one
day). Note that I'm basically only using the IRBuilder, JIT, and a few
common optimization passes. Removing the optimizations doesn't seem to
affect the executable size at all, so I'm starting to wonder whether there
are a lot of other unused features ending up in the binary (I'm using Visual
C++ 2005 by the way, which is supposed to be quite good at reducing code
size). Maybe there is some way to explicitly disable unused features (not
compile them or use stubs)? I'm also under the impression that LLVM uses a
lot of static (pre-generated) tables, and maybe they could be somewhat
smaller when making some extra assumptions?

 

Thanks a lot,

 

Nicolas Capens

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