MFC r309124:

Upgrade our copies of clang, llvm, lldb, compiler-rt and libc++ to 3.9.0
release, and add lld 3.9.0.  Also completely revamp the build system for
clang, llvm, lldb and their related tools.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm, clang and lld are available here:
<http://llvm.org/releases/3.9.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/clang/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Bryan Drewery, Andrew Turner, Antoine Brodin and Jan
Beich for their help.

Relnotes:	yes

MFC r309147:

Pull in r282174 from upstream llvm trunk (by Krzysztof Parzyszek):

  [PPC] Set SP after loading data from stack frame, if no red zone is
  present

  Follow-up to r280705: Make sure that the SP is only restored after
  all data is loaded from the stack frame, if there is no red zone.

  This completes the fix for
  https://llvm.org/bugs/show_bug.cgi?id=26519.

  Differential Revision: https://reviews.llvm.org/D24466

Reported by:    Mark Millard
PR:             214433

MFC r309149:

Pull in r283060 from upstream llvm trunk (by Hal Finkel):

  [PowerPC] Refactor soft-float support, and enable PPC64 soft float

  This change enables soft-float for PowerPC64, and also makes
  soft-float disable all vector instruction sets for both 32-bit and
  64-bit modes. This latter part is necessary because the PPC backend
  canonicalizes many Altivec vector types to floating-point types, and
  so soft-float breaks scalarization support for many operations. Both
  for embedded targets and for operating-system kernels desiring
  soft-float support, it seems reasonable that disabling hardware
  floating-point also disables vector instructions (embedded targets
  without hardware floating point support are unlikely to have Altivec,
  etc. and operating system kernels desiring not to use floating-point
  registers to lower syscall cost are unlikely to want to use vector
  registers either). If someone needs this to work, we'll need to
  change the fact that we promote many Altivec operations to act on
  v4f32. To make it possible to disable Altivec when soft-float is
  enabled, hardware floating-point support needs to be expressed as a
  positive feature, like the others, and not a negative feature,
  because target features cannot have dependencies on the disabling of
  some other feature. So +soft-float has now become -hard-float.

  Fixes PR26970.

Pull in r283061 from upstream clang trunk (by Hal Finkel):

  [PowerPC] Enable soft-float for PPC64, and +soft-float -> -hard-float

  Enable soft-float support on PPC64, as the backend now supports it.
  Also, the backend now uses -hard-float instead of +soft-float, so set
  the target features accordingly.

  Fixes PR26970.

Reported by:	Mark Millard
PR:		214433

MFC r309212:

Add a few missed clang 3.9.0 files to OptionalObsoleteFiles.

MFC r309262:

Fix packaging for clang, lldb and lld 3.9.0

During the upgrade of clang/llvm etc to 3.9.0 in r309124, the PACKAGE
directive in the usr.bin/clang/*.mk files got dropped accidentally.

Restore it, with a few minor changes and additions:
* Correct license in clang.ucl to NCSA
* Add PACKAGE=clang for clang and most of the "ll" tools
* Put lldb in its own package
* Put lld in its own package

Reviewed by:	gjb, jmallett
Differential Revision: https://reviews.freebsd.org/D8666

MFC r309656:

During the bootstrap phase, when building the minimal llvm library on
PowerPC, add lib/Support/Atomic.cpp.  This is needed because upstream
llvm revision r271821 disabled the use of std::call_once, which causes
some fallback functions from Atomic.cpp to be used instead.

Reported by:	Mark Millard
PR:		214902

MFC r309835:

Tentatively apply https://reviews.llvm.org/D18730 to work around gcc PR
70528 (bogus error: constructor required before non-static data member).
This should fix buildworld with the external gcc package.

Reported by:	https://jenkins.freebsd.org/job/FreeBSD_HEAD_amd64_gcc/

MFC r310194:

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
3.9.1 release.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/3.9.1/docs/ReleaseNotes.html>
<http://releases.llvm.org/3.9.1/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/3.9.1/tools/lld/docs/ReleaseNotes.html>

Relnotes:	yes

1 files changed, 99 insertions, 45 deletions

diff --git a/contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp b/contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp
index 90b7a33..1dd8f4f 100644
--- a/contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp
+++ b/contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp
@@ -27,24 +27,34 @@ using namespace llvm;
 #define DEBUG_TYPE "block-freq"
 
 #ifndef NDEBUG
-enum GVDAGType {
-  GVDT_None,
-  GVDT_Fraction,
-  GVDT_Integer
-};
-
-static cl::opt<GVDAGType>
-ViewBlockFreqPropagationDAG("view-block-freq-propagation-dags", cl::Hidden,
-          cl::desc("Pop up a window to show a dag displaying how block "
-                   "frequencies propagation through the CFG."),
-          cl::values(
-            clEnumValN(GVDT_None, "none",
-                       "do not display graphs."),
-            clEnumValN(GVDT_Fraction, "fraction", "display a graph using the "
-                       "fractional block frequency representation."),
-            clEnumValN(GVDT_Integer, "integer", "display a graph using the raw "
-                       "integer fractional block frequency representation."),
-            clEnumValEnd));
+static cl::opt<GVDAGType> ViewBlockFreqPropagationDAG(
+    "view-block-freq-propagation-dags", cl::Hidden,
+    cl::desc("Pop up a window to show a dag displaying how block "
+             "frequencies propagation through the CFG."),
+    cl::values(clEnumValN(GVDT_None, "none", "do not display graphs."),
+               clEnumValN(GVDT_Fraction, "fraction",
+                          "display a graph using the "
+                          "fractional block frequency representation."),
+               clEnumValN(GVDT_Integer, "integer",
+                          "display a graph using the raw "
+                          "integer fractional block frequency representation."),
+               clEnumValN(GVDT_Count, "count", "display a graph using the real "
+                                               "profile count if available."),
+               clEnumValEnd));
+
+cl::opt<std::string>
+    ViewBlockFreqFuncName("view-bfi-func-name", cl::Hidden,
+                          cl::desc("The option to specify "
+                                   "the name of the function "
+                                   "whose CFG will be displayed."));
+
+cl::opt<unsigned>
+    ViewHotFreqPercent("view-hot-freq-percent", cl::init(10), cl::Hidden,
+                       cl::desc("An integer in percent used to specify "
+                                "the hot blocks/edges to be displayed "
+                                "in red: a block or edge whose frequency "
+                                "is no less than the max frequency of the "
+                                "function multiplied by this percent."));
 
 namespace llvm {
 
@@ -71,34 +81,31 @@ struct GraphTraits<BlockFrequencyInfo *> {
   }
 };
 
-template<>
-struct DOTGraphTraits<BlockFrequencyInfo*> : public DefaultDOTGraphTraits {
-  explicit DOTGraphTraits(bool isSimple=false) :
-    DefaultDOTGraphTraits(isSimple) {}
+typedef BFIDOTGraphTraitsBase<BlockFrequencyInfo, BranchProbabilityInfo>
+    BFIDOTGTraitsBase;
 
-  static std::string getGraphName(const BlockFrequencyInfo *G) {
-    return G->getFunction()->getName();
-  }
+template <>
+struct DOTGraphTraits<BlockFrequencyInfo *> : public BFIDOTGTraitsBase {
+  explicit DOTGraphTraits(bool isSimple = false)
+      : BFIDOTGTraitsBase(isSimple) {}
 
   std::string getNodeLabel(const BasicBlock *Node,
                            const BlockFrequencyInfo *Graph) {
-    std::string Result;
-    raw_string_ostream OS(Result);
-
-    OS << Node->getName() << ":";
-    switch (ViewBlockFreqPropagationDAG) {
-    case GVDT_Fraction:
-      Graph->printBlockFreq(OS, Node);
-      break;
-    case GVDT_Integer:
-      OS << Graph->getBlockFreq(Node).getFrequency();
-      break;
-    case GVDT_None:
-      llvm_unreachable("If we are not supposed to render a graph we should "
-                       "never reach this point.");
-    }
-
-    return Result;
+
+    return BFIDOTGTraitsBase::getNodeLabel(Node, Graph,
+                                           ViewBlockFreqPropagationDAG);
+  }
+
+  std::string getNodeAttributes(const BasicBlock *Node,
+                                const BlockFrequencyInfo *Graph) {
+    return BFIDOTGTraitsBase::getNodeAttributes(Node, Graph,
+                                                ViewHotFreqPercent);
+  }
+
+  std::string getEdgeAttributes(const BasicBlock *Node, EdgeIter EI,
+                                const BlockFrequencyInfo *BFI) {
+    return BFIDOTGTraitsBase::getEdgeAttributes(Node, EI, BFI, BFI->getBPI(),
+                                                ViewHotFreqPercent);
   }
 };
 
@@ -113,6 +120,21 @@ BlockFrequencyInfo::BlockFrequencyInfo(const Function &F,
   calculate(F, BPI, LI);
 }
 
+BlockFrequencyInfo::BlockFrequencyInfo(BlockFrequencyInfo &&Arg)
+    : BFI(std::move(Arg.BFI)) {}
+
+BlockFrequencyInfo &BlockFrequencyInfo::operator=(BlockFrequencyInfo &&RHS) {
+  releaseMemory();
+  BFI = std::move(RHS.BFI);
+  return *this;
+}
+
+// Explicitly define the default constructor otherwise it would be implicitly
+// defined at the first ODR-use which is the BFI member in the
+// LazyBlockFrequencyInfo header.  The dtor needs the BlockFrequencyInfoImpl
+// template instantiated which is not available in the header.
+BlockFrequencyInfo::~BlockFrequencyInfo() {}
+
 void BlockFrequencyInfo::calculate(const Function &F,
                                    const BranchProbabilityInfo &BPI,
                                    const LoopInfo &LI) {
@@ -120,8 +142,11 @@ void BlockFrequencyInfo::calculate(const Function &F,
     BFI.reset(new ImplType);
   BFI->calculate(F, BPI, LI);
 #ifndef NDEBUG
-  if (ViewBlockFreqPropagationDAG != GVDT_None)
+  if (ViewBlockFreqPropagationDAG != GVDT_None &&
+      (ViewBlockFreqFuncName.empty() ||
+       F.getName().equals(ViewBlockFreqFuncName))) {
     view();
+  }
 #endif
 }
 
@@ -129,8 +154,15 @@ BlockFrequency BlockFrequencyInfo::getBlockFreq(const BasicBlock *BB) const {
   return BFI ? BFI->getBlockFreq(BB) : 0;
 }
 
-void BlockFrequencyInfo::setBlockFreq(const BasicBlock *BB,
-                                      uint64_t Freq) {
+Optional<uint64_t>
+BlockFrequencyInfo::getBlockProfileCount(const BasicBlock *BB) const {
+  if (!BFI)
+    return None;
+
+  return BFI->getBlockProfileCount(*getFunction(), BB);
+}
+
+void BlockFrequencyInfo::setBlockFreq(const BasicBlock *BB, uint64_t Freq) {
   assert(BFI && "Expected analysis to be available");
   BFI->setBlockFreq(BB, Freq);
 }
@@ -151,6 +183,10 @@ const Function *BlockFrequencyInfo::getFunction() const {
   return BFI ? BFI->getFunction() : nullptr;
 }
 
+const BranchProbabilityInfo *BlockFrequencyInfo::getBPI() const {
+  return BFI ? &BFI->getBPI() : nullptr;
+}
+
 raw_ostream &BlockFrequencyInfo::
 printBlockFreq(raw_ostream &OS, const BlockFrequency Freq) const {
   return BFI ? BFI->printBlockFreq(OS, Freq) : OS;
@@ -211,3 +247,21 @@ bool BlockFrequencyInfoWrapperPass::runOnFunction(Function &F) {
   BFI.calculate(F, BPI, LI);
   return false;
 }
+
+char BlockFrequencyAnalysis::PassID;
+BlockFrequencyInfo BlockFrequencyAnalysis::run(Function &F,
+                                               AnalysisManager<Function> &AM) {
+  BlockFrequencyInfo BFI;
+  BFI.calculate(F, AM.getResult<BranchProbabilityAnalysis>(F),
+                AM.getResult<LoopAnalysis>(F));
+  return BFI;
+}
+
+PreservedAnalyses
+BlockFrequencyPrinterPass::run(Function &F, AnalysisManager<Function> &AM) {
+  OS << "Printing analysis results of BFI for function "
+     << "'" << F.getName() << "':"
+     << "\n";
+  AM.getResult<BlockFrequencyAnalysis>(F).print(OS);
+  return PreservedAnalyses::all();
+}