loop unswitching is sensitive to edge order

[Steven Bosscher]

On Saturday 25 September 2004 13:40, Ben Elliston wrote:
> Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz> writes:
> > > The following patch of yours seems to add some code that is sensitive
> > > to the order of edges in the bb edge list.  Am I right?
> >
> > I do not know, since I do not understand what you mean.  What problem
> > do you see with the code?
>
> My edges-in-vectors patch breaks when integrated with your patch.  I
> was able to fix that breakage by modifying my code so that new
> elements are inserted at the head of the vector and that vector order
> is maintained when elements are removed (ie. it emulates the behaviour
> of the existing pred and succ linked lists).
>
> My understanding is that none of the code in GCC should depend on the
> order of edges in their containers.  This is the first time I've
> encountered such behaviour.

Can you post your merge patch so everyone can see what is going on?

Gr.
Steven