[LLVMdev] llvm LTO SPEC2000 results?

[Duncan Sands]

Hi Jack,

> It would appear that the gcc LTO implementation
> is finally showing results (although with a lot
> of wrong code results). I assume we really don't
> have a functional -fwhole-program in llvm-gcc-4.2
> but do we have one in clang?

it's been possible to do the equivalent of -fwhole-program
for ages in LLVM, you just have to run some LLVM tools by
hand or use the gold plugin.  I never did it on SPEC (I don't
have SPEC) but for some scientific computation stuff I have here
I saw a 10% speed up (more or less) using whole program lto.

Ciao,

Duncan.