preserves domfrontier.  It does preserve AA though.

llvm-svn: 112419

require DomFrontier.  Dropping this doesn't actually save any runs
of the pass though.

llvm-svn: 112418

Among other things, this uses SSAUpdater instead of 
PromoteMemToReg.

llvm-svn: 112417

llvm-svn: 112412

This leads to much simpler code.

llvm-svn: 112410

llvm-svn: 112408

getUniqueExitBlocks instead of getExitBlocks and a manual
set to eliminate dupes.

llvm-svn: 112405

llvm-svn: 112404

I'm aware of, aren't maintained, and LVI will be replacing their value.
nlewycky approved this on irc.

llvm-svn: 112355

llvm-svn: 112350

llvm-svn: 112332

Add a prototype of a new peephole optimizing pass that uses LazyValue info to simplify PHIs and select's.
This pass addresses the missed optimizations from PR2581 and PR4420.

llvm-svn: 112325

llvm-svn: 112286

Use LVI to eliminate conditional branches where we've tested a related condition previously.  Update tests for this change.
This fixes PR5652.

llvm-svn: 112270

llvm-svn: 112198

llvm-svn: 112104

llvm-svn: 111923

llvm-svn: 111834

llvm-svn: 111816

Now that PassInfo and Pass::ID have been separated, move the rest of the passes over to the new registration API.

llvm-svn: 111815

llvm-svn: 111551

llvm-svn: 111543

of the two.

llvm-svn: 111495

llvm-svn: 111382

from the LHS should disable reconsidering that pred on the
RHS.  However, knowing something about the pred on the RHS
shouldn't disable subsequent additions on the RHS from
happening.

llvm-svn: 111349

llvm-svn: 111344

llvm-svn: 111342

loop, making the resulting loop significantly less ugly.  Also, zap
its trivial PHI nodes, since it's easy.

llvm-svn: 111255

Add an option to disable codegen prepare critical edge splitting. In theory, PHI elimination is already doing all (most?) of the splitting needed. But machine-licm and machine-sink seem to miss some important optimizations when splitting is disabled.

llvm-svn: 111224

uninteresting, just put all the operands on one list and make
GenerateReassociations make the decision about what's interesting.
This is simpler, and it avoids an extra ScalarEvolution::getAddExpr call.

llvm-svn: 111133

This isn't necessary, because ScalarEvolution sorts them anyway,
but it's tidier this way.

llvm-svn: 111132

 - Eliminate redundant successors.
 - Convert an indirectbr with one successor into a direct branch.

Also, generalize SimplifyCFG to be able to be run on a function entry block.
It knows quite a few simplifications which are applicable to the entry
block, and it only needs a few checks to avoid trouble with the entry block.

llvm-svn: 111060

ScalarEvolution::getAddExpr, which can be pretty expensive, when nothing
has changed, which is pretty common.

llvm-svn: 111042

before it rewrites the code, we need to use that in the post-rewrite pass.

llvm-svn: 110962

llvm-svn: 110489

llvm-svn: 110460

Also move 'default' case next to a real case to help compiler optimize in
non-Debug builds.
No functionality change.

llvm-svn: 110435

llvm-svn: 110410

ID member as the sole unique type identifier.  Clean up APIs related to this change.

llvm-svn: 110396

llvm-svn: 110384