llvm dev - Feb 2015 - [LLVMdev] Any mechanism available for link time inlineing?

> On Feb 12, 2015, at 8:15 AM, mobi phil <mobi at mobiphil.com> wrote:
> 
> sorry to insist. While I do not beleive the question was the dumbest in the
world, would love to know to find out some info, please find belowe the short
version of the question:
> 
> Is there already in LLVM or is there any plan to support some mechanism for
static/dynamic inline-ing?
It is already statically possible at link-time using LTO. I *think* it is
enabled by default looking at
https://llvm.org/svn/llvm-project/llvm/trunk/tools/llvm-lto/llvm-lto.cpp
Try googling “LLVM LTO inlining” for more info.

Mehdi

thanks, sounds great, heard about llvm-lto, but was not following in
details. I have an llvm-lto in my dev branch build....now what I do not
find are some example on how to use it for link time inline-ing. In worst
case have to deal with the overhead to experiment



mobi phil
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mobi phil wrote:
> thanks, sounds great, heard about llvm-lto, but was not following in
> details. I have an llvm-lto in my dev branch build....now what I do not
> find are some example on how to use it for link time inline-ing. In
> worst case have to deal with the overhead to experiment
With what linker?

LLVM LTO is available by default with Apple's XCode development 
environment, just specify -O4.

For linux or similar, see llvm.org/docs/GoldPlugin.html . You may be 
able to just use -O4 on linux too, depending on how your llvm and linker 
are installed, and assuming you run "clang" for your link steps.

Inlining occurs because it's a standard part of the link time 
optimization pipeline. If you need to turn off the rest of LTO, reducing 
it down to only inlining, that would take more work.

Nick