organization of optimization options in manual

[Jeff Law]

On 01/17/15 07:34, Gary Funck wrote:
> On 01/14/15 23:15:59, Jeff Law wrote:
>> Sounds good.  I think just starting with the list & creating the buckets
>> with the list.  Then post here and we'll iterate and try to nail that down
>> before you start moving everything in the .texi file.
>
> Something to consider, if the optimization options are re-worked:
> Arrange the -O options such that -O1 can be described by a
> distinct set of specific optimizations enabled (or disabled)
> in addition to -O0, and -O2 would be described as a composite
> of specific optimizations applied to -O1 and so on. (This
> might require the addition of new optimization options.)
For -O1 to -O2 and -O2 to -O3, that makes sense.  However, -O0 to -O1 
isn't something we can do this for right now as there are still many 
things that -O1 turns on that are not flag controlled.

Whether or not to make all those bits individually controllable is a 
subject of debate.  Personally, I think we have too many options, so my 
inclination would not be to make all those bits individually 
controllable.  Others may have different opinions.

jeff