am 31675153: Merge branch \'upstream\' into merge_2

* commit '31675153bd2d7617db8cb6aeb58054934c7b9f73': (542 commits)
  MaximumSpanningTree::EdgeWeightCompare: Make this comparator actually be a strict weak ordering, and don't pass possibly-null pointers to dyn_cast.
  Fix misaligned access in MachO object file reader: despite containing an int64_t, Symbol64TableEntry is actually only stored with 4-byte alignment within the file.
  Fix unaligned memory accesses when performing relocations in X86 JIT. There's no cost to using memcpy here: the fixed code is optimized by LLVM to perfect machine code.
  Don't pass a null pointer to cast<> in its unit tests.
  Don't bind a reference to a dereferenced null pointer (for return value of WeakVH::operator*).
  [ms-inline asm] Do not report a Parser error when matching inline assembly.
  Ignore the documentation-suggested location for compile_commands.json
  The presence of the empty file "foo" unfortunately does not improve LLVM in any way.
  Remove unnecessary cast that was also unnecessarily casting away constness.
  Provide a portability macro for __builtin_trap.
  Fix macros arguments with an underscore, dot or dollar in them. This is based on a patch by Andy/PaX. I added the support for dot and dollar.
  [ms-inline asm] Expose the ErrorInfo from the MatchInstructionImpl.  In general, this is the index of the operand that failed to match.
  Formatting.  No functional change.
  Make the wording in of the "expected identifier" error in the .macro directive consistent with the other "expected identifier" errors. Extracted from the Andy/PaX patch. I added the test.
  Pacify PVS-Studio by changing the type rather than doing a cast, a tweak suggested by David Blaikie.
  Add support for the --param ssp-buffer-size= driver option. PR9673
  Use typedefs. Fix indentation. Extracted from the Andy/PaX patch.
  Remove unused variable. Extracted from the Andy/PaX patch.
  Fix typo. Extracted from the Andy/PaX patch.
  MCJIT: Tidy up the constructor.
  ...

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/CodeGen/SplitKit.cpp b/lib/CodeGen/SplitKit.cpp
index 9a751c1..4a2b7ec 100644
--- a/lib/CodeGen/SplitKit.cpp
+++ b/lib/CodeGen/SplitKit.cpp
@@ -652,7 +652,7 @@ void SplitEditor::removeBackCopies(SmallVectorImpl<VNInfo*> &Copies) {
     // Adjust RegAssign if a register assignment is killed at VNI->def.  We
     // want to avoid calculating the live range of the source register if
     // possible.
-    AssignI.find(VNI->def.getPrevSlot());
+    AssignI.find(Def.getPrevSlot());
     if (!AssignI.valid() || AssignI.start() >= Def)
       continue;
     // If MI doesn't kill the assigned register, just leave it.
@@ -739,6 +739,8 @@ void SplitEditor::hoistCopiesForSize() {
   for (LiveInterval::vni_iterator VI = LI->vni_begin(), VE = LI->vni_end();
        VI != VE; ++VI) {
     VNInfo *VNI = *VI;
+    if (VNI->isUnused())
+      continue;
     VNInfo *ParentVNI = Edit->getParent().getVNInfoAt(VNI->def);
     assert(ParentVNI && "Parent not live at complement def");
 
@@ -812,6 +814,8 @@ void SplitEditor::hoistCopiesForSize() {
   for (LiveInterval::vni_iterator VI = LI->vni_begin(), VE = LI->vni_end();
        VI != VE; ++VI) {
     VNInfo *VNI = *VI;
+    if (VNI->isUnused())
+      continue;
     VNInfo *ParentVNI = Edit->getParent().getVNInfoAt(VNI->def);
     const DomPair &Dom = NearestDom[ParentVNI->id];
     if (!Dom.first || Dom.second == VNI->def)
@@ -1047,8 +1051,7 @@ void SplitEditor::finish(SmallVectorImpl<unsigned> *LRMap) {
     if (ParentVNI->isUnused())
       continue;
     unsigned RegIdx = RegAssign.lookup(ParentVNI->def);
-    VNInfo *VNI = defValue(RegIdx, ParentVNI, ParentVNI->def);
-    VNI->setIsPHIDef(ParentVNI->isPHIDef());
+    defValue(RegIdx, ParentVNI, ParentVNI->def);
 
     // Force rematted values to be recomputed everywhere.
     // The new live ranges may be truncated.