-finline-functions default with -Os ?

[Steven Bosscher]

2010/7/3 Frédéric L. W. Meunier <fredlwm@gmail.com>:
> Here, -finline-functions appears to be the default using -Os with GCC 4.4.4
> on Linux (tested with k8-sse3 and 486).
>
> But according to the man page, "Enabled at level -O3". Does the manual need
> a fix ?

Yes, it should say "Enabled at levels -O3 and -Os".


> The info page also states -Os disables
>
> "-falign-functions -falign-jumps -falign-loops -falign-labels
> -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays
> -ftree-vect-loop-version"
>
> but -falign-loops -freorder-blocks -ftree-vect-loop-version seem to be in.
>
> Or all these vary by processor ?

I do not see align-loops set, and -freorder-blocks is definitely not
in. If -ftree-vect-loop-version is in, that would be a bug.

What target are you looking at, and what are you looking at that
suggests these options are enabled?


> As I see, -O2 to -Os only adds -finline-functions and removes
> -maccumulate-outgoing-args ?

No, also some parameters for heuristics take different default values.

Ciao!
Steven