[tree-ssa] Organization of tree-ssa optimization passes

[law@redhat.com]

In message <20031204042528.GC12181@redhat.com>, Richard Henderson writes:
 >On Wed, Dec 03, 2003 at 08:26:31PM -0700, law@redhat.com wrote:
 >> Yup.  Ideally we'd also have a set of flags which indicate which key
 >> data structures are clobbered by the pass.  ie, if a pass mucks up the
 >> dominator tree, immediate uses, etc, then I'd like to know that.
 >
 >Yes.  You'd also like to know what kinds of program data the
 >pass requires.  I didn't mention that because I didn't want
 >him to try to solve that additional problem at the same time. 
Makes sense.  We can always add that info to the datastructure once the base
code is in place.
jeff