keeping them around until the pass is destroyed, keep them
around a) just when useful (not for outer loops) and b) destroy
them right after we use them.  This should reduce memory use
and fixes potential bugs where a loop is deleted and another
loop gets allocated to the same address.

llvm-svn: 112446

claims that it preserves domfrontier if it doesn't really.

llvm-svn: 112445

for the unroller to pretend it supports updating it.  It still
has a horrible hack for DomTree.

llvm-svn: 112444

other filtering techniques, as those may allow it to filter
out more obviously unprofitable candidates.

llvm-svn: 112441

LSRInstance data structures up to date. This fixes some
pessimizations caused by stale data which will be exposed
in an upcoming change.

llvm-svn: 112440

NarrowSearchSpaceUsingHeuristics into separate functions.

llvm-svn: 112439

llvm-svn: 112438

llvm-svn: 112437

the high-level logic.

llvm-svn: 112436

llvm-svn: 112435

llvm-svn: 112434

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