MFC 261991:

Upgrade our copy of llvm/clang to 3.4 release.  This version supports
all of the features in the current working draft of the upcoming C++
standard, provisionally named C++1y.

The code generator's performance is greatly increased, and the loop
auto-vectorizer is now enabled at -Os and -O2 in addition to -O3.  The
PowerPC backend has made several major improvements to code generation
quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ
backends have all seen major feature work.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.4/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html>

MFC 262121 (by emaste):

Update lldb for clang/llvm 3.4 import

This commit largely restores the lldb source to the upstream r196259
snapshot with the addition of threaded inferior support and a few bug
fixes.

Specific upstream lldb revisions restored include:
   SVN      git
  181387  779e6ac
  181703  7bef4e2
  182099  b31044e
  182650  f2dcf35
  182683  0d91b80
  183862  15c1774
  183929  99447a6
  184177  0b2934b
  184948  4dc3761
  184954  007e7bc
  186990  eebd175

Sponsored by:	DARPA, AFRL

MFC 262186 (by emaste):

Fix mismerge in r262121

A break statement was lost in the merge.  The error had no functional
impact, but restore it to reduce the diff against upstream.

MFC 262303:

Pull in r197521 from upstream clang trunk (by rdivacky):

  Use the integrated assembler by default on FreeBSD/ppc and ppc64.

Requested by:	jhibbits

MFC 262611:

Pull in r196874 from upstream llvm trunk:

  Fix a crash that occurs when PWD is invalid.

  MCJIT needs to be able to run in hostile environments, even when PWD
  is invalid. There's no need to crash MCJIT in this case.

  The obvious fix is to simply leave MCContext's CompilationDir empty
  when PWD can't be determined. This way, MCJIT clients,
  and other clients that link with LLVM don't need a valid working directory.

  If we do want to guarantee valid CompilationDir, that should be done
  only for clients of getCompilationDir(). This is as simple as checking
  for an empty string.

  The only current use of getCompilationDir is EmitGenDwarfInfo, which
  won't conceivably run with an invalid working dir. However, in the
  purely hypothetically and untestable case that this happens, the
  AT_comp_dir will be omitted from the compilation_unit DIE.

This should help fix assertions occurring with ports-mgmt/tinderbox,
when it is using jails, and sometimes invalidates clang's current
working directory.

Reported by:	decke

MFC 262809:

Pull in r203007 from upstream clang trunk:

  Don't produce an alias between destructors with different calling conventions.

  Fixes pr19007.

(Please note that is an LLVM PR identifier, not a FreeBSD one.)

This should fix Firefox and/or libxul crashes (due to problems with
regparm/stdcall calling conventions) on i386.

Reported by:	multiple users on freebsd-current
PR:		bin/187103

MFC 263048:

Repair recognition of "CC" as an alias for the C++ compiler, since it
was silently broken by upstream for a Windows-specific use-case.

Apparently some versions of CMake still rely on this archaic feature...

Reported by:	rakuco

MFC 263049:

Garbage collect the old way of adding the libstdc++ include directories
in clang's InitHeaderSearch.cpp.  This has been superseded by David
Chisnall's commit in r255321.

Moreover, if libc++ is used, the libstdc++ include directories should
not be in the search path at all.  These directories are now only used
if you pass -stdlib=libstdc++.

1 files changed, 0 insertions, 152 deletions

diff --git a/contrib/llvm/lib/Transforms/Scalar/BasicBlockPlacement.cpp b/contrib/llvm/lib/Transforms/Scalar/BasicBlockPlacement.cpp
deleted file mode 100644
index e755008..0000000
--- a/contrib/llvm/lib/Transforms/Scalar/BasicBlockPlacement.cpp
+++ /dev/null
@@ -1,152 +0,0 @@
-//===-- BasicBlockPlacement.cpp - Basic Block Code Layout optimization ----===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements a very simple profile guided basic block placement
-// algorithm.  The idea is to put frequently executed blocks together at the
-// start of the function, and hopefully increase the number of fall-through
-// conditional branches.  If there is no profile information for a particular
-// function, this pass basically orders blocks in depth-first order
-//
-// The algorithm implemented here is basically "Algo1" from "Profile Guided Code
-// Positioning" by Pettis and Hansen, except that it uses basic block counts
-// instead of edge counts.  This should be improved in many ways, but is very
-// simple for now.
-//
-// Basically we "place" the entry block, then loop over all successors in a DFO,
-// placing the most frequently executed successor until we run out of blocks.  I
-// told you this was _extremely_ simplistic. :) This is also much slower than it
-// could be.  When it becomes important, this pass will be rewritten to use a
-// better algorithm, and then we can worry about efficiency.
-//
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "block-placement"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/Analysis/ProfileInfo.h"
-#include "llvm/IR/Function.h"
-#include "llvm/Pass.h"
-#include "llvm/Support/CFG.h"
-#include <set>
-using namespace llvm;
-
-STATISTIC(NumMoved, "Number of basic blocks moved");
-
-namespace {
-  struct BlockPlacement : public FunctionPass {
-    static char ID; // Pass identification, replacement for typeid
-    BlockPlacement() : FunctionPass(ID) {
-      initializeBlockPlacementPass(*PassRegistry::getPassRegistry());
-    }
-
-    virtual bool runOnFunction(Function &F);
-
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      AU.setPreservesCFG();
-      AU.addRequired<ProfileInfo>();
-      //AU.addPreserved<ProfileInfo>();  // Does this work?
-    }
-  private:
-    /// PI - The profile information that is guiding us.
-    ///
-    ProfileInfo *PI;
-
-    /// NumMovedBlocks - Every time we move a block, increment this counter.
-    ///
-    unsigned NumMovedBlocks;
-
-    /// PlacedBlocks - Every time we place a block, remember it so we don't get
-    /// into infinite loops.
-    std::set<BasicBlock*> PlacedBlocks;
-
-    /// InsertPos - This an iterator to the next place we want to insert a
-    /// block.
-    Function::iterator InsertPos;
-
-    /// PlaceBlocks - Recursively place the specified blocks and any unplaced
-    /// successors.
-    void PlaceBlocks(BasicBlock *BB);
-  };
-}
-
-char BlockPlacement::ID = 0;
-INITIALIZE_PASS_BEGIN(BlockPlacement, "block-placement",
-                "Profile Guided Basic Block Placement", false, false)
-INITIALIZE_AG_DEPENDENCY(ProfileInfo)
-INITIALIZE_PASS_END(BlockPlacement, "block-placement",
-                "Profile Guided Basic Block Placement", false, false)
-
-FunctionPass *llvm::createBlockPlacementPass() { return new BlockPlacement(); }
-
-bool BlockPlacement::runOnFunction(Function &F) {
-  PI = &getAnalysis<ProfileInfo>();
-
-  NumMovedBlocks = 0;
-  InsertPos = F.begin();
-
-  // Recursively place all blocks.
-  PlaceBlocks(F.begin());
-
-  PlacedBlocks.clear();
-  NumMoved += NumMovedBlocks;
-  return NumMovedBlocks != 0;
-}
-
-
-/// PlaceBlocks - Recursively place the specified blocks and any unplaced
-/// successors.
-void BlockPlacement::PlaceBlocks(BasicBlock *BB) {
-  assert(!PlacedBlocks.count(BB) && "Already placed this block!");
-  PlacedBlocks.insert(BB);
-
-  // Place the specified block.
-  if (&*InsertPos != BB) {
-    // Use splice to move the block into the right place.  This avoids having to
-    // remove the block from the function then readd it, which causes a bunch of
-    // symbol table traffic that is entirely pointless.
-    Function::BasicBlockListType &Blocks = BB->getParent()->getBasicBlockList();
-    Blocks.splice(InsertPos, Blocks, BB);
-
-    ++NumMovedBlocks;
-  } else {
-    // This block is already in the right place, we don't have to do anything.
-    ++InsertPos;
-  }
-
-  // Keep placing successors until we run out of ones to place.  Note that this
-  // loop is very inefficient (N^2) for blocks with many successors, like switch
-  // statements.  FIXME!
-  while (1) {
-    // Okay, now place any unplaced successors.
-    succ_iterator SI = succ_begin(BB), E = succ_end(BB);
-
-    // Scan for the first unplaced successor.
-    for (; SI != E && PlacedBlocks.count(*SI); ++SI)
-      /*empty*/;
-    if (SI == E) return;  // No more successors to place.
-
-    double MaxExecutionCount = PI->getExecutionCount(*SI);
-    BasicBlock *MaxSuccessor = *SI;
-
-    // Scan for more frequently executed successors
-    for (; SI != E; ++SI)
-      if (!PlacedBlocks.count(*SI)) {
-        double Count = PI->getExecutionCount(*SI);
-        if (Count > MaxExecutionCount ||
-            // Prefer to not disturb the code.
-            (Count == MaxExecutionCount && *SI == &*InsertPos)) {
-          MaxExecutionCount = Count;
-          MaxSuccessor = *SI;
-        }
-      }
-
-    // Now that we picked the maximally executed successor, place it.
-    PlaceBlocks(MaxSuccessor);
-  }
-}