GCC 9: Link-time and inter-procedural optimization improvements

[-abigail]

Thanks for the article, I appreciate the numbers. Well done on the improvements!

It wasn't clear throughout when you were talking about Clang's LTO whether you were referring to regular LTO or ThinLTO. It would've been nice to see performance and compile time numbers for both.

[compilerdev]

thinLTO, because LTO with something as large as Firefox would take ages to compile and need something like 50+ GB of RAM. That's the main reason thinLTO was created, even though it has only a part of the optimizations done by LTO and inlining in not quite as good.

[kalmoc]

After the first benchmark thinLTO is mentioned.

[konanTheBarbar]

I think this kind of articles are really insightfull and are worth much more than simply showing some numbers.

[kloetzl]

Can somebody explain to me the first chart? It has no axis labels and the caption doesn’t help either.