New flags: -misched-topdown, -misched-bottomup. They can be used with
the default scheduler or with -misched=shuffle. Without either
topdown/bottomup flag -misched=shuffle now alternates scheduling
direction.

LiveIntervals update is unimplemented with bottom-up scheduling, so
only -misched-topdown currently works.

Capped the ScheduleDAG hierarchy with a concrete ScheduleDAGMI class.
ScheduleDAGMI is aware of the top and bottom of the unscheduled zone
within the current region. Scheduling policy can be plugged into
the ScheduleDAGMI driver by implementing MachineSchedStrategy.
ConvergingScheduler is now the default scheduling algorithm.
It exercises the new driver but still does no reordering.

llvm-svn: 152700

llvm-svn: 152699

output (we're emitting a specification already and the information
isn't changing).

Saves 1% on the debug information for a build of llvm.

Fixes rdar://11043421

llvm-svn: 152697

Fortify r152675 a bit. Although I'm not able to come up with a test case that would trigger the truncation case.

llvm-svn: 152678

(i16 load $addr+c*sizeof(i16)) and replace uses of (i32 vextract) with the
i16 load. It should issue an extload instead: (i32 extload $addr+c*sizeof(i16)).

rdar://11035895

llvm-svn: 152675

No functionality change.

llvm-svn: 152658

llvm-svn: 152614

llvm-svn: 152613

No functionality change.

llvm-svn: 152611

llvm-svn: 152610

--- Reverse-merging r152486 into '.':
U    lib/CodeGen/SjLjEHPrepare.cpp

llvm-svn: 152571

DwarfDebug: Store the filename/dirname pair as a zero-separated string in a stringmap, instead of using a highly inefficient std::map of a pair of std::strings.

llvm-svn: 152541

Renamed methods caseBegin, caseEnd and caseDefault with case_begin, case_end, and case_default.
Added some notes relative to case iterators.

llvm-svn: 152532

llvm-svn: 152492

The old way of determine when and where to spill a value that was used inside of
a landing pad resulted in spilling that value everywhere and not just at the
invoke edge.

This algorithm determines which values are used within a landing pad. It then
spills those values before the invoke and reloads them before the uses. This
should prevent excessive spilling in many cases, e.g. inside of loops.
<rdar://problem/10609139>

llvm-svn: 152486

llvm-svn: 152460

Somehow we never verified SSA dominance before.

llvm-svn: 152458

llvm-svn: 152457

llvm-svn: 152454

All uses of a virtual register must be dominated by its def.

llvm-svn: 152449

And add comments, since this is obviously confusing.

llvm-svn: 152445

llvm-svn: 152393

llvm-svn: 152382

llvm-svn: 152374

llvm-svn: 152373

llvm-svn: 152360

llvm-svn: 152356

llvm-svn: 152301

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120130/136146.html

Implemented CaseIterator and it solves almost all described issues: we don't need to mix operand/case/successor indexing anymore. Base iterator class is implemented as a template since it may be initialized either from "const SwitchInst*" or from "SwitchInst*".

ConstCaseIt is just a read-only iterator.
CaseIt is read-write iterator; it allows to change case successor and case value.

Usage of iterator allows totally remove resolveXXXX methods. All indexing convertions done automatically inside the iterator's getters.

Main way of iterator usage looks like this:
SwitchInst *SI = ... // intialize it somehow

for (SwitchInst::CaseIt i = SI->caseBegin(), e = SI->caseEnd(); i != e; ++i) {
  BasicBlock *BB = i.getCaseSuccessor();
  ConstantInt *V = i.getCaseValue();
  // Do something.
}

If you want to convert case number to TerminatorInst successor index, just use getSuccessorIndex iterator's method.
If you want initialize iterator from TerminatorInst successor index, use CaseIt::fromSuccessorIndex(...) method.

There are also related changes in llvm-clients: klee and clang.

llvm-svn: 152297

Allow targets to provide their own schedulers (subclass of
ScheduleDAGInstrs) to the misched pass. Select schedulers using
-misched=...

llvm-svn: 152278

llvm-svn: 152262

implement their own MachineScheduler.

llvm-svn: 152261

llvm-svn: 152260

llvm-svn: 152259

ScheduleDAGInstrs will be the main interface for MI-level
schedulers. Make sure it's readable: one page of protected fields, one
page of public methids.

llvm-svn: 152258

llvm-svn: 152257

ScheduleDAGInstrs knows nothing about how instructions will be moved or inserted.

llvm-svn: 152256

We had half the API with one convention, half with another. Now was a
good time to clean it up.

llvm-svn: 152255

llvm-svn: 152221

This one is particularly annoying because the hashing algorithm is
highly specialized, with a strange "equivalence" definition that subsets
the fields involved.

Still, this looks at the exact same set of data as the old code, but
without bitwise or-ing over parts of it and other mixing badness. No
functionality changed here. I've left a substantial fixme about the fact
that there is a cleaner and more principled way to do this, but it
requires making the equality definition actual stable for particular
types...

llvm-svn: 152218