[boost] [Proto] Inlining failure on gcc 4.x on 64bits linux

Subject: [boost] [Proto] Inlining failure on gcc 4.x on 64bits linux
From: joel falcou (joel.falcou_at_[hidden])
Date: 2010-07-19 14:30:32

I'm reporting this performances problem we encountered today.
We have a large expression operating on table of 51200000 elements;

In 32bits mode, our proto code for NT² works perfectly and output a 
gprofile like:
http://codepad.org/Uyyvkq4X

rutniem performance sis somethign like 1.5s for the whoel computation.

In 64bits on linus using gcc 4.4 or 4.3, we got a massive 8.6s of 
runtime (!!)
and the profile is:

http://codepad.org/6VgRsbyR

As it seems the call to proto::default_ is not inlined (hence the 5.12M 
calls) and take 80% of the runtime.

I don't thing anything is 32/64bits specific in proto  so is it a bug in 
gcc ?

I don't have code handy here but will do tomorrow.