These 2 relocations gain access to the 
highest and the second highest 16 bits
of a 64 bit object.

R_MIPS_HIGHER %higher(A+S)
The %higher(x) function is [ (((long long) x + 0x80008000LL) >> 32) & 0xffff ]. 

R_MIPS_HIGHEST %highest(A+S)
The %highest(x) function is [ (((long long) x + 0x800080008000LL) >> 48) & 0xffff ]. 

llvm-svn: 161348

The MFTB instruction itself is being phased out, and its functionality
is provided by MFSPR. According to the ISA docs, using MFSPR works on all known
chips except for the 601 (which did not have a timebase register anyway)
and the POWER3.

Thanks to Adhemerval Zanella for pointing this out!

llvm-svn: 161346

Patch by David Hill.

llvm-svn: 161344

llvm-svn: 161328

Implement proper handling for pcmpistri/pcmpestri intrinsics. Requires custom handling in DAGISelToDAG due to limitations in TableGen's implicit def handling. Fixes PR11305.

llvm-svn: 161318

llvm-svn: 161306

Use a COPY node instead of an explicit MOVA opcode in the custom insterter for pcmpestrm/pcmpistrm. Allows the register allocator to handle it better and prevent wasted identity moves.

llvm-svn: 161305

On PPC64, this can be done with a simple TableGen pattern.
To enable this, I've added the (otherwise missing) readcyclecounter
SDNode definition to TargetSelectionDAG.td.

llvm-svn: 161302

llvm-svn: 161301

(this corresponds by spilling/reloading regs in DTriple / DQuad reg classes).
No testcase, found by inspection.

llvm-svn: 161300

were missed for no reason. This fixes PR13377

llvm-svn: 161299

Postpone the deletion of the old name in StructType::setName to allow using a slice of the old name.

Fixes PR13522. Add a rudimentary unit test to exercise the behavior.

llvm-svn: 161296

TwoAddressInstructionPass doesn't remat any more.

llvm-svn: 161285

llvm-svn: 161284

This patch is mostly just refactoring a bunch of copy-and-pasted code, but
it also adds a check that the call instructions are readnone or readonly.
That check was already present for sin, cos, sqrt, log2, and exp2 calls, but
it was missing for the rest of the builtins being handled in this code.

llvm-svn: 161282

No functional change intended, except replacing a DenseMap with a
SmallDenseMap which should behave identically.

llvm-svn: 161281

This is far from complete, and only changes behavior when the
-early-live-intervals flag is passed to llc.

llvm-svn: 161273

Change these to patterns.
2. Add another 16 instructions.

Patch by Reed Kotler.

llvm-svn: 161272

This option runs LiveIntervals before TwoAddressInstructionPass which
will eventually learn to exploit and update the analysis.

Eventually, LiveIntervals will run before PHIElimination, and we can get
rid of LiveVariables.

llvm-svn: 161270

Previously, the identity copy would survive through register allocation
before it was removed by the rewriter.

llvm-svn: 161269

The previous change caused fast isel to not attempt handling any calls to
builtin functions.  That included things like "printf" and caused some
noticable regressions in compile time.  I wanted to avoid having fast isel
keep a separate list of functions that had to be kept in sync with what the
code in SelectionDAGBuilder.cpp was handling.  I've resolved that here by
moving the list into TargetLibraryInfo.  This is somewhat redundant in
SelectionDAGBuilder but it will ensure that we keep things consistent.

llvm-svn: 161263

I noticed that SelectionDAGBuilder::visitCall was missing a check for memcmp
in TargetLibraryInfo, so that it would use custom code for memcmp calls even
with -fno-builtin.  I also had to add a new -disable-simplify-libcalls option
to llc so that I could write a test for this.

llvm-svn: 161262

The 'unused' state of a value number can be represented as an invalid
def SlotIndex. This also exposed code that shouldn't have been looking
at unused value VNInfos.

llvm-svn: 161258

Unused VNInfos should be left alone. Their def SlotIndex doesn't point
to anything.

llvm-svn: 161257

llvm-svn: 161256

The only real user of the flag was removeCopyByCommutingDef(), and it
has been switched to LiveIntervals::hasPHIKill().

All the code changed by this patch was only concerned with computing and
propagating the flag.

llvm-svn: 161255

The VNInfo::HAS_PHI_KILL is only half supported. We precompute it in
LiveIntervalAnalysis, but it isn't properly updated by live range
splitting and functions like shrinkToUses().

It is only used in one place: RegisterCoalescer::removeCopyByCommutingDef().

This patch changes that function to use a new LiveIntervals::hasPHIKill()
function that computes the flag for a given value number.

llvm-svn: 161254

llvm-svn: 161242

This functionality was added before we started running
DeadMachineInstructionElim on all targets. It serves no purpose now.

llvm-svn: 161241

this makes this hack a bit more bearable
for poor souls who need to pass custom
preprocessor flags to the build process

llvm-svn: 161240

Fast isel doesn't currently have support for translating builtin function
calls to target instructions.  For embedded environments where the library
functions are not available, this is a matter of correctness and not
just optimization.  Most of this patch is just arranging to make the
TargetLibraryInfo available in fast isel.  <rdar://problem/12008746>

llvm-svn: 161232

This just provides a way to look up a LibFunc::Func enum value for a
function name.  Alphabetize the enums and function names so we can use a
binary search.

llvm-svn: 161231

llvm-svn: 161230

The "findUsedStructTypes" method is very expensive to run. It needs to be
optimized so that LTO can run faster. Splitting this method out of the Module
class will help this occur. For instance, it can keep a list of seen objects so
that it doesn't process them over and over again.

llvm-svn: 161228

but somehow managed to be dropped later.

Patch by Karel Gardas.

llvm-svn: 161226

llvm-svn: 161222

llvm-svn: 161220

Now that TableGen supports references to NAME w/o it being explicitly
referenced in the definition's own name, use that to simplify
assembly InstAlias definitions in multiclasses.

llvm-svn: 161218

Add more comments and use early returns to reduce nesting in isLoadFoldable.
Also disable folding for V_SET0 to avoid introducing a const pool entry and
a const pool load.

rdar://10554090 and rdar://11873276

llvm-svn: 161207

Previously, def NAME values were only populated, and references to NAME
resolved, when NAME was referenced in the 'def' entry of the multiclass
sub-entry. e.g.,
multiclass foo<...> {
  def prefix_#NAME : ...
}

It's useful, however, to be able to reference NAME even when the default
def name is used. For example, when a multiclass has 'def : Pat<...>'
or 'def : InstAlias<...>' entries which refer to earlier instruction
definitions in the same multiclass. e.g.,
multiclass myMulti<RegisterClass rc> {
  def _r : myI<(outs rc:$d), (ins rc:$r), "r $d, $r", []>;

  def : InstAlias<\"wilma $r\", (!cast<Instruction>(NAME#\"_r\") rc:$r, rc:$r)>;
}

llvm-svn: 161198