llvm-svn: 137282

llvm-svn: 137277

An algorithm for incrementally updating LoopInfo within a
LoopPassManager. The incremental update should be extremely cheap in
most cases and can be used in places where it's not feasible to
regenerate the entire loop forest.

- "Unloop" is a node in the loop tree whose last backedge has been removed.
- Perform reverse dataflow on the block inside Unloop to propagate the
  nearest loop from the block's successors.
- For reducible CFG, each block in unloop is visited exactly
  once. This is because unloop no longer has a backedge and blocks
  within subloops don't change parents.
- Immediate subloops are summarized by the nearest loop reachable from
  their exits or exits within nested subloops.
- At completion the unloop blocks each have a new parent loop, and
  each immediate subloop has a new parent.

llvm-svn: 137276

llvm-svn: 137274

llvm-svn: 137272

llvm-svn: 137271

llvm-svn: 137270

llvm-svn: 137265

llvm-svn: 137264

llvm-svn: 137263

llvm-svn: 137262

llvm-svn: 137261

llvm-svn: 137260

llvm-svn: 137258

Add support for literal encoding of #-0 along the way.

llvm-svn: 137254

Distinguish between two copies of one inlined variable. Take 2.

llvm-svn: 137253

While extending definition range of a debug variable, consult lexical scopes also. There is no point extending debug variable out side its lexical block. This provides 6x compile time speedup in some cases.

llvm-svn: 137250

llvm-svn: 137249

llvm-svn: 137246

llvm-svn: 137245

llvm-svn: 137244

llvm-svn: 137243

llvm-svn: 137241

data in-register prior to saving to memory.  When we reorder the data in memory
we prevent the need to save multiple scalars to memory, making a single regular
store.

llvm-svn: 137238

llvm-svn: 137237

llvm-svn: 137236

Use an Init (ultimately a StringInit) to represent the Record name.
This allows the name to be composed by standard TableGen operators.
This will enable us to get rid of the ugly #NAME# hack processing and
naturally replace it with operators.  It also increases flexibility
and power of the TableGen language by allowing record identifiers to
be computed dynamically.

llvm-svn: 137232

Add a method to return an Init as an unquoted string.  This primarily
affects StringInit where we return the value without surrounding it
with quotes.

This is in preparation for removing the ugly #NAME# hack and replacing
it with standard TabelGen operators.

llvm-svn: 137231

Also, my apologies for spoiling the autocomplete on SimplifyInstructions.cpp. I couldn't think of a better filename.

llvm-svn: 137229

def : Pat<(X86Movss VR128:$src1,
                   (bc_v4i32 (v2i64 (load addr:$src2)))),
          (MOVLPSrm VR128:$src1, addr:$src2)>;
This matches a MOVSS dag with a MOVLPS instruction. However, MOVSS will replace only the low 32 bits of the register, while the MOVLPS instruction will replace the low 64 bits. A testcase is added and illustrates the bug and also modified the one that was already present. Patch by Tanya Lattner.

llvm-svn: 137227

llvm-svn: 137226

llvm-svn: 137225

llvm-svn: 137224

Rewrite some ARM InstrInfo functions to be most accepting of arbitrary register subclasses.  Hopefully this fixes some buildbots.

llvm-svn: 137223

llvm-svn: 137217

llvm-svn: 137204

llvm-svn: 137203

SimplifyIndVar utility since it is required.

llvm-svn: 137202

llvm-svn: 137199

llvm-svn: 137198