No documentation of -fsched-pressure-algorithm

[nick clifton]

Hi Richard,

>>    I have just noticed that the new -fsched-pressure-algorithm= gcc
>>    command line option is not documented in gcc/doc/invoke.texi.  Was
>>    this an oversight ?
>
> No, it was deliberate.  It's not supposed to be a user-level option.

Then why is there a user-visible command line option ?

Also - why shouldn't it be a user-level option ?  In my experience gcc's 
instruction scheduling tends to be very sensitive to the algorithm being 
compiled.  For some applications it does a good job, but for others it 
actually makes the performance worth.  Being able to tune the behaviour 
of the scheduler (via the various -fsched-... options) has been very 
helpful in getting good benchmark results.

Cheers
   Nick