llvm-svn: 83745

PHI nodes inserted.

llvm-svn: 83744

llvm-svn: 83743

llvm-svn: 83742

not just at the end.  Add a big comment explaining when this could
be useful (which never happens for jump threading).

llvm-svn: 83741

what it does.

llvm-svn: 83740

Remove impdef of SRW. This fixes PR4779

llvm-svn: 83739

llvm-svn: 83738

llvm-svn: 83737

llvm-svn: 83736

llvm-svn: 83735

llvm-svn: 83734

llvm-svn: 83733

llvm-svn: 83728

llvm-svn: 83724

llvm-svn: 83722

llvm-svn: 83721

clang static analyser.  Decrease duplication in the text.

llvm-svn: 83720

llvm-svn: 83719

llvm-svn: 83717

llvm-svn: 83716

llvm-svn: 83715

llvm-svn: 83707

DemoteRegToStack.  This makes it more efficient (because it isn't
creating a ton of load/stores that are eventually removed by a later
mem2reg), and more slightly more effective (because those load/stores
don't get in the way of threading).

llvm-svn: 83706

works on unstructured CFGs.  This implements PR217, our oldest open PR.

llvm-svn: 83705

a Value* to a WeakVH was constructing a temporary WeakVH
(due to the implicit assignment operator).  This avoids
that cost.

llvm-svn: 83704

llvm-svn: 83703

Use, to complement the version that takes a use_iterator.

llvm-svn: 83702

llvm-svn: 83701

into MachineInstrs. This is mostly just moving the code from
ScheduleDAGSDNodesEmit.cpp into a new class. This decouples MachineInstr
emitting from scheduling.

llvm-svn: 83699

since it won't do any folding. This will help avoid some inconvenient
casting.

llvm-svn: 83698

llvm-svn: 83697

MachineInstr::isInvariantLoad instead, which has the benefit of being
more complete.

llvm-svn: 83696

llvm-svn: 83695

it isn't needed in the ScheduleDAGSDNodes schedulers.

llvm-svn: 83691

fewer remat.

llvm-svn: 83690

when loading from an invariant memory location.

llvm-svn: 83688

is trivially rematerializable and integrate it into
TargetInstrInfo::isTriviallyReMaterializable. This way, all places that
need to know whether an instruction is rematerializable will get the
same answer.

This enables the useful parts of the aggressive-remat option by
default -- using AliasAnalysis to determine whether a memory location
is invariant, and removes the questionable parts -- rematting operations
with virtual register inputs that may not be live everywhere.

llvm-svn: 83687

Extract scope information from the variable itself, instead of relying on alloca or llvm.dbg.declare location.

While recording beginning of a function, use scope info from the first location entry instead of just relying on first location entry itself.

llvm-svn: 83684

mappings, which could cause errors and assert-failures.  This patch fixes that,
adds a test, and refactors the global-mapping-removal code into a single place.

llvm-svn: 83678