Update clang, llvm, lld, lldb, compiler-rt and libc++ to 4.0.0 release:

MFC r309142 (by emaste):

Add WITH_LLD_AS_LD build knob

If set it installs LLD as /usr/bin/ld.  LLD (as of version 3.9) is not
capable of linking the world and kernel, but can self-host and link many
substantial applications. GNU ld continues to be used for the world and
kernel build, regardless of how this knob is set.

It is on by default for arm64, and off for all other CPU architectures.

Sponsored by:	The FreeBSD Foundation

MFC r310840:

Reapply 310775, now it also builds correctly if lldb is disabled:

Move llvm-objdump from CLANG_EXTRAS to installed by default

We currently install three tools from binutils 2.17.50: as, ld, and
objdump. Work is underway to migrate to a permissively-licensed
tool-chain, with one goal being the retirement of binutils 2.17.50.

LLVM's llvm-objdump is intended to be compatible with GNU objdump
although it is currently missing some options and may have formatting
differences. Enable it by default for testing and further investigation.
It may later be changed to install as /usr/bin/objdump, it becomes a
fully viable replacement.

Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D8879

MFC r312855 (by emaste):

Rename LLD_AS_LD to LLD_IS_LD, for consistency with CLANG_IS_CC

Reported by:	Dan McGregor <dan.mcgregor usask.ca>

MFC r313559 | glebius | 2017-02-10 18:34:48 +0100 (Fri, 10 Feb 2017) | 5 lines

Don't check struct rtentry on FreeBSD, it is an internal kernel structure.
On other systems it may be API structure for SIOCADDRT/SIOCDELRT.

Reviewed by:	emaste, dim

MFC r314152 (by jkim):

Remove an assembler flag, which is redundant since r309124.  The upstream
took care of it by introducing a macro NO_EXEC_STACK_DIRECTIVE.

http://llvm.org/viewvc/llvm-project?rev=273500&view=rev

Reviewed by:	dim

MFC r314564:

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
4.0.0 (branches/release_40 296509).  The release will follow soon.

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

Also note that as of 4.0.0, lld should be able to link the base system
on amd64 and aarch64.  See the WITH_LLD_IS_LLD setting in src.conf(5).
Though please be aware that this is work in progress.

Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/4.0.0/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Jan Beich, Antoine Brodin and Eric Fiselier for
their help.

Relnotes:	yes
Exp-run:	antoine
PR:		215969, 216008

MFC r314708:

For now, revert r287232 from upstream llvm trunk (by Daniil Fukalov):

  [SCEV] limit recursion depth of CompareSCEVComplexity

  Summary:
  CompareSCEVComplexity goes too deep (50+ on a quite a big unrolled
  loop) and runs almost infinite time.

  Added cache of "equal" SCEV pairs to earlier cutoff of further
  estimation. Recursion depth limit was also introduced as a parameter.

  Reviewers: sanjoy

  Subscribers: mzolotukhin, tstellarAMD, llvm-commits

  Differential Revision: https://reviews.llvm.org/D26389

This commit is the cause of excessive compile times on skein_block.c
(and possibly other files) during kernel builds on amd64.

We never saw the problematic behavior described in this upstream commit,
so for now it is better to revert it.  An upstream bug has been filed
here: https://bugs.llvm.org/show_bug.cgi?id=32142

Reported by:	mjg

MFC r314795:

Reapply r287232 from upstream llvm trunk (by Daniil Fukalov):

  [SCEV] limit recursion depth of CompareSCEVComplexity

  Summary:
  CompareSCEVComplexity goes too deep (50+ on a quite a big unrolled
  loop) and runs almost infinite time.

  Added cache of "equal" SCEV pairs to earlier cutoff of further
  estimation. Recursion depth limit was also introduced as a parameter.

  Reviewers: sanjoy

  Subscribers: mzolotukhin, tstellarAMD, llvm-commits

  Differential Revision: https://reviews.llvm.org/D26389

Pull in r296992 from upstream llvm trunk (by Sanjoy Das):

  [SCEV] Decrease the recursion threshold for CompareValueComplexity

  Fixes PR32142.

  r287232 accidentally increased the recursion threshold for
  CompareValueComplexity from 2 to 32.  This change reverses that
  change by introducing a separate flag for CompareValueComplexity's
  threshold.

The latter revision fixes the excessive compile times for skein_block.c.

MFC r314907 | mmel | 2017-03-08 12:40:27 +0100 (Wed, 08 Mar 2017) | 7 lines

Unbreak ARMv6 world.

The new compiler_rt library imported with clang 4.0.0 have several fatal
issues (non-functional __udivsi3 for example) with ARM specific instrict
functions. As temporary workaround, until upstream solve these problems,
disable all thumb[1][2] related feature.

MFC r315016:

Update clang, llvm, lld, lldb, compiler-rt and libc++ to 4.0.0 release.
We were already very close to the last release candidate, so this is a
pretty minor update.

Relnotes:	yes

MFC r316005:

Revert r314907, and pull in r298713 from upstream compiler-rt trunk (by
Weiming Zhao):

  builtins: Select correct code fragments when compiling for Thumb1/Thum2/ARM ISA.

  Summary:
  Value of __ARM_ARCH_ISA_THUMB isn't based on the actual compilation
  mode (-mthumb, -marm), it reflect's capability of given CPU.

  Due to this:
   - use  __tbumb__ and __thumb2__ insteand of __ARM_ARCH_ISA_THUMB
   - use '.thumb' directive consistently  in all affected files
   - decorate all thumb functions using
     DEFINE_COMPILERRT_THUMB_FUNCTION()

  ---------
  Note: This patch doesn't fix broken Thumb1 variant of __udivsi3 !

  Reviewers: weimingz, rengolin, compnerd

  Subscribers: aemerson, dim

  Differential Revision: https://reviews.llvm.org/D30938

Discussed with:	mmel

1 files changed, 47 insertions, 35 deletions

diff --git a/contrib/llvm/lib/CodeGen/LocalStackSlotAllocation.cpp b/contrib/llvm/lib/CodeGen/LocalStackSlotAllocation.cpp
index af7392f..e189fb0 100644
--- a/contrib/llvm/lib/CodeGen/LocalStackSlotAllocation.cpp
+++ b/contrib/llvm/lib/CodeGen/LocalStackSlotAllocation.cpp
@@ -51,12 +51,21 @@ namespace {
     MachineBasicBlock::iterator MI; // Instr referencing the frame
     int64_t LocalOffset;            // Local offset of the frame idx referenced
     int FrameIdx;                   // The frame index
+
+    // Order reference instruction appears in program. Used to ensure
+    // deterministic order when multiple instructions may reference the same
+    // location.
+    unsigned Order;
+
   public:
-    FrameRef(MachineBasicBlock::iterator I, int64_t Offset, int Idx) :
-      MI(I), LocalOffset(Offset), FrameIdx(Idx) {}
+    FrameRef(MachineInstr *I, int64_t Offset, int Idx, unsigned Ord) :
+      MI(I), LocalOffset(Offset), FrameIdx(Idx), Order(Ord) {}
+
     bool operator<(const FrameRef &RHS) const {
-      return LocalOffset < RHS.LocalOffset;
+      return std::tie(LocalOffset, FrameIdx, Order) <
+             std::tie(RHS.LocalOffset, RHS.FrameIdx, RHS.Order);
     }
+
     MachineBasicBlock::iterator getMachineInstr() const { return MI; }
     int64_t getLocalOffset() const { return LocalOffset; }
     int getFrameIndex() const { return FrameIdx; }
@@ -67,17 +76,17 @@ namespace {
     /// StackObjSet - A set of stack object indexes
     typedef SmallSetVector<int, 8> StackObjSet;
 
-    void AdjustStackOffset(MachineFrameInfo *MFI, int FrameIdx, int64_t &Offset,
+    void AdjustStackOffset(MachineFrameInfo &MFI, int FrameIdx, int64_t &Offset,
                            bool StackGrowsDown, unsigned &MaxAlign);
     void AssignProtectedObjSet(const StackObjSet &UnassignedObjs,
                                SmallSet<int, 16> &ProtectedObjs,
-                               MachineFrameInfo *MFI, bool StackGrowsDown,
+                               MachineFrameInfo &MFI, bool StackGrowsDown,
                                int64_t &Offset, unsigned &MaxAlign);
     void calculateFrameObjectOffsets(MachineFunction &Fn);
     bool insertFrameReferenceRegisters(MachineFunction &Fn);
   public:
     static char ID; // Pass identification, replacement for typeid
-    explicit LocalStackSlotPass() : MachineFunctionPass(ID) { 
+    explicit LocalStackSlotPass() : MachineFunctionPass(ID) {
       initializeLocalStackSlotPassPass(*PassRegistry::getPassRegistry());
     }
     bool runOnMachineFunction(MachineFunction &MF) override;
@@ -102,9 +111,9 @@ INITIALIZE_PASS_END(LocalStackSlotPass, "localstackalloc",
 
 
 bool LocalStackSlotPass::runOnMachineFunction(MachineFunction &MF) {
-  MachineFrameInfo *MFI = MF.getFrameInfo();
+  MachineFrameInfo &MFI = MF.getFrameInfo();
   const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
-  unsigned LocalObjectCount = MFI->getObjectIndexEnd();
+  unsigned LocalObjectCount = MFI.getObjectIndexEnd();
 
   // If the target doesn't want/need this pass, or if there are no locals
   // to consider, early exit.
@@ -112,7 +121,7 @@ bool LocalStackSlotPass::runOnMachineFunction(MachineFunction &MF) {
     return true;
 
   // Make sure we have enough space to store the local offsets.
-  LocalOffsets.resize(MFI->getObjectIndexEnd());
+  LocalOffsets.resize(MFI.getObjectIndexEnd());
 
   // Lay out the local blob.
   calculateFrameObjectOffsets(MF);
@@ -125,21 +134,21 @@ bool LocalStackSlotPass::runOnMachineFunction(MachineFunction &MF) {
   // Otherwise, PEI can do a bit better job of getting the alignment right
   // without a hole at the start since it knows the alignment of the stack
   // at the start of local allocation, and this pass doesn't.
-  MFI->setUseLocalStackAllocationBlock(UsedBaseRegs);
+  MFI.setUseLocalStackAllocationBlock(UsedBaseRegs);
 
   return true;
 }
 
 /// AdjustStackOffset - Helper function used to adjust the stack frame offset.
-void LocalStackSlotPass::AdjustStackOffset(MachineFrameInfo *MFI,
+void LocalStackSlotPass::AdjustStackOffset(MachineFrameInfo &MFI,
                                            int FrameIdx, int64_t &Offset,
                                            bool StackGrowsDown,
                                            unsigned &MaxAlign) {
   // If the stack grows down, add the object size to find the lowest address.
   if (StackGrowsDown)
-    Offset += MFI->getObjectSize(FrameIdx);
+    Offset += MFI.getObjectSize(FrameIdx);
 
-  unsigned Align = MFI->getObjectAlignment(FrameIdx);
+  unsigned Align = MFI.getObjectAlignment(FrameIdx);
 
   // If the alignment of this object is greater than that of the stack, then
   // increase the stack alignment to match.
@@ -154,10 +163,10 @@ void LocalStackSlotPass::AdjustStackOffset(MachineFrameInfo *MFI,
   // Keep the offset available for base register allocation
   LocalOffsets[FrameIdx] = LocalOffset;
   // And tell MFI about it for PEI to use later
-  MFI->mapLocalFrameObject(FrameIdx, LocalOffset);
+  MFI.mapLocalFrameObject(FrameIdx, LocalOffset);
 
   if (!StackGrowsDown)
-    Offset += MFI->getObjectSize(FrameIdx);
+    Offset += MFI.getObjectSize(FrameIdx);
 
   ++NumAllocations;
 }
@@ -166,7 +175,7 @@ void LocalStackSlotPass::AdjustStackOffset(MachineFrameInfo *MFI,
 /// those required to be close to the Stack Protector) to stack offsets.
 void LocalStackSlotPass::AssignProtectedObjSet(const StackObjSet &UnassignedObjs,
                                            SmallSet<int, 16> &ProtectedObjs,
-                                           MachineFrameInfo *MFI,
+                                           MachineFrameInfo &MFI,
                                            bool StackGrowsDown, int64_t &Offset,
                                            unsigned &MaxAlign) {
 
@@ -183,7 +192,7 @@ void LocalStackSlotPass::AssignProtectedObjSet(const StackObjSet &UnassignedObjs
 ///
 void LocalStackSlotPass::calculateFrameObjectOffsets(MachineFunction &Fn) {
   // Loop over all of the stack objects, assigning sequential addresses...
-  MachineFrameInfo *MFI = Fn.getFrameInfo();
+  MachineFrameInfo &MFI = Fn.getFrameInfo();
   const TargetFrameLowering &TFI = *Fn.getSubtarget().getFrameLowering();
   bool StackGrowsDown =
     TFI.getStackGrowthDirection() == TargetFrameLowering::StackGrowsDown;
@@ -194,22 +203,22 @@ void LocalStackSlotPass::calculateFrameObjectOffsets(MachineFunction &Fn) {
   // Make sure that the stack protector comes before the local variables on the
   // stack.
   SmallSet<int, 16> ProtectedObjs;
-  if (MFI->getStackProtectorIndex() >= 0) {
+  if (MFI.getStackProtectorIndex() >= 0) {
     StackObjSet LargeArrayObjs;
     StackObjSet SmallArrayObjs;
     StackObjSet AddrOfObjs;
 
-    AdjustStackOffset(MFI, MFI->getStackProtectorIndex(), Offset,
+    AdjustStackOffset(MFI, MFI.getStackProtectorIndex(), Offset,
                       StackGrowsDown, MaxAlign);
 
     // Assign large stack objects first.
-    for (unsigned i = 0, e = MFI->getObjectIndexEnd(); i != e; ++i) {
-      if (MFI->isDeadObjectIndex(i))
+    for (unsigned i = 0, e = MFI.getObjectIndexEnd(); i != e; ++i) {
+      if (MFI.isDeadObjectIndex(i))
         continue;
-      if (MFI->getStackProtectorIndex() == (int)i)
+      if (MFI.getStackProtectorIndex() == (int)i)
         continue;
 
-      switch (SP->getSSPLayout(MFI->getObjectAllocation(i))) {
+      switch (SP->getSSPLayout(MFI.getObjectAllocation(i))) {
       case StackProtector::SSPLK_None:
         continue;
       case StackProtector::SSPLK_SmallArray:
@@ -235,10 +244,10 @@ void LocalStackSlotPass::calculateFrameObjectOffsets(MachineFunction &Fn) {
 
   // Then assign frame offsets to stack objects that are not used to spill
   // callee saved registers.
-  for (unsigned i = 0, e = MFI->getObjectIndexEnd(); i != e; ++i) {
-    if (MFI->isDeadObjectIndex(i))
+  for (unsigned i = 0, e = MFI.getObjectIndexEnd(); i != e; ++i) {
+    if (MFI.isDeadObjectIndex(i))
       continue;
-    if (MFI->getStackProtectorIndex() == (int)i)
+    if (MFI.getStackProtectorIndex() == (int)i)
       continue;
     if (ProtectedObjs.count(i))
       continue;
@@ -247,8 +256,8 @@ void LocalStackSlotPass::calculateFrameObjectOffsets(MachineFunction &Fn) {
   }
 
   // Remember how big this blob of stack space is
-  MFI->setLocalFrameSize(Offset);
-  MFI->setLocalFrameMaxAlign(MaxAlign);
+  MFI.setLocalFrameSize(Offset);
+  MFI.setLocalFrameMaxAlign(MaxAlign);
 }
 
 static inline bool
@@ -273,7 +282,7 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) {
   // and ask the target to create a defining instruction for it.
   bool UsedBaseReg = false;
 
-  MachineFrameInfo *MFI = Fn.getFrameInfo();
+  MachineFrameInfo &MFI = Fn.getFrameInfo();
   const TargetRegisterInfo *TRI = Fn.getSubtarget().getRegisterInfo();
   const TargetFrameLowering &TFI = *Fn.getSubtarget().getFrameLowering();
   bool StackGrowsDown =
@@ -285,6 +294,8 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) {
   // choose the first one).
   SmallVector<FrameRef, 64> FrameReferenceInsns;
 
+  unsigned Order = 0;
+
   for (MachineBasicBlock &BB : Fn) {
     for (MachineInstr &MI : BB) {
       // Debug value, stackmap and patchpoint instructions can't be out of
@@ -305,21 +316,22 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) {
         // an object allocated in the local block.
         if (MI.getOperand(i).isFI()) {
           // Don't try this with values not in the local block.
-          if (!MFI->isObjectPreAllocated(MI.getOperand(i).getIndex()))
+          if (!MFI.isObjectPreAllocated(MI.getOperand(i).getIndex()))
             break;
           int Idx = MI.getOperand(i).getIndex();
           int64_t LocalOffset = LocalOffsets[Idx];
           if (!TRI->needsFrameBaseReg(&MI, LocalOffset))
             break;
-          FrameReferenceInsns.push_back(FrameRef(&MI, LocalOffset, Idx));
+          FrameReferenceInsns.push_back(FrameRef(&MI, LocalOffset, Idx, Order++));
           break;
         }
       }
     }
   }
 
-  // Sort the frame references by local offset
-  array_pod_sort(FrameReferenceInsns.begin(), FrameReferenceInsns.end());
+  // Sort the frame references by local offset.
+  // Use frame index as a tie-breaker in case MI's have the same offset.
+  std::sort(FrameReferenceInsns.begin(), FrameReferenceInsns.end());
 
   MachineBasicBlock *Entry = &Fn.front();
 
@@ -332,7 +344,7 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) {
     MachineInstr &MI = *FR.getMachineInstr();
     int64_t LocalOffset = FR.getLocalOffset();
     int FrameIdx = FR.getFrameIndex();
-    assert(MFI->isObjectPreAllocated(FrameIdx) &&
+    assert(MFI.isObjectPreAllocated(FrameIdx) &&
            "Only pre-allocated locals expected!");
 
     DEBUG(dbgs() << "Considering: " << MI);
@@ -349,7 +361,7 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) {
     assert(idx < MI.getNumOperands() && "Cannot find FI operand");
 
     int64_t Offset = 0;
-    int64_t FrameSizeAdjust = StackGrowsDown ? MFI->getLocalFrameSize() : 0;
+    int64_t FrameSizeAdjust = StackGrowsDown ? MFI.getLocalFrameSize() : 0;
 
     DEBUG(dbgs() << "  Replacing FI in: " << MI);