domtree by 10% and postdomtree by 17%

llvm-svn: 40829

a smallptrset.  This speeds up domtree by about 15% and postdomtree by 20%.

llvm-svn: 40828

speeds up idom by about 45% and postidom by about 33%.

Some extra precautions must be taken not to invalidate densemap iterators.

llvm-svn: 40827

DenseMap instead of an std::map.  This speeds up postdomtree
by about 25% and domtree by about 23%.  It also speeds up clients,
for example, domfrontier by 11%, mem2reg by 4% and ADCE by 6%.

llvm-svn: 40826

exit edge to preserve LCSSA.

Fix dominance frontier update during loop unswitch. This fixes PR 1589, again

llvm-svn: 40737

llvm-svn: 40698

exit edge to preserve LCSSA.

Fix dominance frontier update during loop unswitch. This fixes PR 1589.

llvm-svn: 40695

llvm-svn: 40564

llvm-svn: 37765

from LoopSimplify.cpp to Dominator.cpp

llvm-svn: 37689

llvm-svn: 37562

llvm-svn: 37561

common dominator.

llvm-svn: 37559

Remove unused PostETForest.

llvm-svn: 37551

llvm-svn: 37548

Fix 80 col violations.

llvm-svn: 37547

This means now ETNodes are not useful anymore.

llvm-svn: 37546

llvm-svn: 37545

Now LoopSimplify does not require nor preserve ETForest.

llvm-svn: 37512

llvm-svn: 37504

This adds redundancy for now.

llvm-svn: 37492

llvm-svn: 37475

llvm-svn: 37417

llvm-svn: 37407

llvm-svn: 37403

llvm-svn: 37314

llvm-svn: 36694

llvm-svn: 36662

Due to darwin gcc bug, one version of darwin linker coalesces
static const int, which defauts PassID based pass identification.

llvm-svn: 36652

llvm-svn: 36632

Fix http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20070416/048092.html

llvm-svn: 36294

llvm-svn: 36094

Remove ImmediateDominator analysis.  The same information can be obtained from DomTree.  A lot of code for
constructing ImmediateDominator is now folded into DomTree construction.

This is part of the ongoing work for PR217.

llvm-svn: 36063

llvm-svn: 36035

in the long process that will be fixing PR 217.

llvm-svn: 36034

llvm-svn: 35815

llvm-svn: 35807

llvm-svn: 35797

llvm-svn: 35775

llvm-svn: 35756