Re: [wwwdocs] Add GCC10 IPA/LTO changes

[Gerald Pfeifer <gerald at pfeifer dot com>]

On Mon, 30 Dec 2019, Jan Hubicka wrote:
> here are some of changes of LTO/IPA done in GCC10. 

Quite a bit! :-)

> +<p>The following GCC command line options have been introduced or improved.</p>

...command-line...

> +  <li><a href="https://gcc.gnu.org/onlinedocs/gcc-10.1.0/gcc/Optimize-Options.html#index-fprofile-partial-training";><code>-fprofile-partial-training</code></a>

I suggest to use the mainline version of the docs unless you believe
there is going to be significant changes (removals) in the future?

https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html

> +      can now be used to inform compiler that code paths not covered by the
> +      train run should not be optimized for size.</li>

...the compiler...

(Is it "train run" or "training run"?)

> +<p>A large number of improvements to code generation have been made, including
> +   but not limited to the following.</p>

Can you format for a smaller width here?  Otherwise patches run a little
wide.

> +    <li>Inter-procedural scalar replacement for aggregates (IPA-SRA) pass was re-implemented to work at link-time.

The inter-procedural...

> +    <li><a href="https://gcc.gnu.org/onlinedocs/gcc-10.1.0/gcc/Optimize-Options.html#index-finline-functions";><code>-finline-functions</code></a>
> +	is now enabled at <code>-O2</code> and was retuned for better code size
> +	versus runtime performance tradeofs.  Inliner heuristics was also

...trade-offs... (dash plus double f)

> +    <li>Selected <code>--param</code> values can now be specified at
> +        translation unit granuality. This includes all parameters controlling
> +        inliner.</li>

...the inliner....

> +    <li>Profile maintenance during compilation was improved and hot/cold 

How about "Profile maintenance during compilation and hot/cold code 
partitioning have been improved"?


Okay with those changes.

Thank you,
Gerald