terminators that actually have register uses when splitting critical edges.

This commit also introduces a method repairIntervalsInRange() on LiveIntervals,
which allows for repairing LiveIntervals in a small range after an arbitrary
target hook modifies, inserts, and removes instructions. It's pretty limited
right now, but I hope to extend it to support all of the things that are done
by the convertToThreeAddress() target hooks.

llvm-svn: 175382

This avoids unnecessary copies. No functionality change.

llvm-svn: 175367

No functionality change.

llvm-svn: 175366

llvm-svn: 175365

updateScheduledPressure method.

llvm-svn: 175362

If the frame pointer is omitted, and any stack changes occur in the inline
assembly, e.g.: "pusha", then any C local variable or C argument references
will be incorrect.  

I pass no judgement on anyone who would do such a thing. ;)
rdar://13218191

llvm-svn: 175334

If two functions require different features (e.g., `-mno-sse' vs. `-msse') then
we want to honor that, especially during LTO. We can do that by resetting the
subtarget's features depending upon the 'target-feature' attribute.

llvm-svn: 175314

- add sincos to runtime library if target triple environment is GNU
- added canCombineSinCosLibcall() which checks that sincos is in the RTL and
  if the environment is GNU then unsafe fpmath is enabled (required to
  preserve errno)
- extended sincos-opt lit test

Reviewed by: Hal Finkel

llvm-svn: 175283

llvm-svn: 175264

llvm-svn: 175190

Add some legality checks for SETCC before introducing it in the DAG combiner post-operand legalization.

llvm-svn: 175149

register class to match the defining instruction.

llvm-svn: 175130

CoalescerPairs. Also, make it take a CoalescerPair directly like other methods
of RegisterCoalescer.

llvm-svn: 175123

of the copy is a subregister def. The current code assumes that it can do a full
def of the destination register, but it is not checking that the def operand is
read-undef. It also doesn't clear the subregister index of the destination in
the new instruction to reflect the full subregister def.

These issues were found running 'make check' with my next commit that enables
rematerialization in more cases.

llvm-svn: 175122

Remove dead functions: renameRegister
Move private member variables from LDV to Impl
Remove ssp/uwtable from testing case

llvm-svn: 175072

llvm-svn: 175067

llvm-svn: 175024

RegisterCoalescer used to depend on LiveDebugVariable. LDV removes DBG_VALUEs
without emitting them at the end.

We fix this by removing LDV from RegisterCoalescer. Also add an assertion to
make sure we call emitDebugValues if DBG_VALUEs are removed at
runOnMachineFunction.

rdar://problem/13183203
Reviewed by Andy & Jakob

llvm-svn: 175023

Add static cast to unsigned char whenever a character classification function is called with a signed char argument, in order to avoid assertions in Windows Debug configuration.

llvm-svn: 175006

option "generate-dwarf-pubnames" to control it, set to "false" by default.

llvm-svn: 174981

Equal treatment of labels and other terminators in MI DAG construction.

MI sched DAG construction allows targets to include terminators into scheduling DAG.
Extend this functionality to labels as well.

llvm-svn: 174977

DAGCombiner::ReduceLoadWidth was converting (trunc i32 (shl i64 v, 32))
into (shl i32 v, 32) into undef. To prevent this, check the shift count
against the final result size.

Patch by: Kevin Schoedel
Reviewed by: Nadav Rotem

llvm-svn: 174972

live range after inserting a copy at the end of a block.

llvm-svn: 174945

llvm-svn: 174944

particularly useful for catching issues with architectures that have exotic
terminators like MIPS.

llvm-svn: 174938

a critical edge.

llvm-svn: 174936

live ranges should always be extended, and the only successor that should be
considered for extension of other ranges is the target of the split edge.

llvm-svn: 174935

Sorry for the lack of a test case.  I tried writing one for i386 as i know selects are illegal on this target, but they are actually considered legal by isel and expanded later.

I can't see any targets to trigger this, but checking for the legality of a node before forming it is general goodness.

llvm-svn: 174934

This is currently a bit hairier than it needs to be, since depending on where the
split block resides the end ListEntry of the split block may be the end ListEntry
of the original block or a new entry. Some changes to the SlotIndexes updating
should make it possible to eliminate the two cases here.

This also isn't as optimized as it could be. In the future Liveinterval should
probably get a flag that indicates whether the LiveInterval is within a single
basic block. We could ignore all such intervals when splitting an edge.

llvm-svn: 174870

really trying to avoid piping SlotIndexes through to RemoveBranch() and friends.

llvm-svn: 174869

This reverts my commit 171047. Now that I've removed my misguided attempt to
support backend warnings, these diagnostics are only about inline assembly.
It would take quite a bit more work to generalize them properly, so I'm
just reverting this.

llvm-svn: 174860

function is successfully handled by fast-isel. That's because function
arguments are *always* handled by SDISel. Introduce FastLowerArguments to
allow each target to provide hook to handle formal argument lowering.

As a proof-of-concept, add ARMFastIsel::FastLowerArguments to handle
functions with 4 or fewer scalar integer (i8, i16, or i32) arguments. It
completely eliminates the need for SDISel for trivial functions.

rdar://13163905

llvm-svn: 174855

llvm-svn: 174854

support for updating SlotIndexes to MachineBasicBlock::SplitCriticalEdge(). This
calls renumberIndexes() every time; it should be improved to only renumber
locally.

llvm-svn: 174851

both LiveVariables and LiveIntervals.

llvm-svn: 174850

present, it currently verifies them with the MachineVerifier, and this passed
all of the test cases in 'make check' (when accounting for existing verifier
errors). There were some assertion failures in the two-address pass, but they
also happened on code without phis and look like they are caused by different
kill flags from LiveIntervals.

The only part that doesn't work is the critical edge splitting heuristic,
because there isn't currently an efficient way to update LiveIntervals after
splitting an edge. I'll probably start by implementing the slow fallback and
test that it works before tackling the fast path for single-block ranges. The
existing code that updates LiveVariables is fairly slow as it is.

There isn't a command-line option for enabling this; instead, just edit
PHIElimination.cpp to require LiveIntervals.

llvm-svn: 174831

llvm-svn: 174830

make sense anymore.

llvm-svn: 174829

llvm-svn: 174828

llvm-svn: 174817