Extend the documentation for "#pragma clang loop" hints to include the unroll
and unroll_count directives.

Patch by Mark Heffernan [http://reviews.llvm.org/D4198]



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revision r211277, this function is essentially a no-op.

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Fix clang tests to not break if the ID numbers of module flags metadata
nodes change.



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Fix assertion hit or bogus compiler error in cases when instantiating ObjC property accesses used with overloaded binary operators.

rdar://17153478

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  for (x : range) { ... }

which is equivalent to

  for (auto &&x : range) { ... }


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[OPENMP] Improved diagnostic messages for vars with the predetermined data sharing attributes and reformatting


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Make it return void and delete the dead code in the parser that handled
the case where it might return false.  This has been dead since 2010
when John deleted Action.h.

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retainable ObjC pointers without requiring a bridge-cast
in the context of pointer comparison as this is in effect 
a +0 context. // rdar://16627903


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CL permits static redeclarations to follow extern declarations.  The
storage specifier on the latter declaration has no effect.

This fixes PR20034.

Differential Revision: http://reviews.llvm.org/D4149

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retainable ObjC pointers without requiring a bridge-cast
by recognizing this as a +0 context. // rdar://16627903


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211234 91177308-0d34-0410-b5e6-96231b3b80d8

Relax the tests to allow for differences between release and debug builds.  This
should fix the buildbots.

Thanks to Benjamin Kramer and Eric Christo for their invaluable tip that this
was release build specific issue.

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This patch enables clang to generate calls to __RTtypeid when lowering 
typeid on win32 targets.  Test cases are included.



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Add support for _InterlockedCompareExchangePointer, _InterlockExchangePointer,
_InterlockExchange.  These are available as a compiler intrinsic on ARM and x86.
These are used directly by the Windows SDK headers without use of the intrin
header.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211216 91177308-0d34-0410-b5e6-96231b3b80d8

boxed expression. // rdar://16417427


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Doing this caused us to mistakenly think we'd seen a particular state before
when we actually hadn't, which resulted in false negatives. Credit to
Rafael Auler for discovering this issue!

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to forward class declarations for diagnosis. 
// rdar://16681279


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Patch by Ehsan Akhgari!

(Tiny tweak by me: renamed PathSegment to LibDir.)

Differential Revision: http://reviews.llvm.org/D4192

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The backend option does not have an '-enable' prefix.

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This makes us handle static locals in exported/imported functions correctly.

Differential Revision: http://reviews.llvm.org/D4136

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In the final phase of the merge, I managed to disable a bunch of Clang
tests accidentally. Fortunately none of them seem to have broken in
the interim.

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Convert an llvm_unreachable in an 'else' block to a removal of the 'if' and an assertion of its condition. Suggestion from David Blaikie.

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Convert assert(0) to llvm_unreachable to silence a warning about Addend being uninitialized in default case.

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When instantiating dllimport variables with dynamic initializers, don't
bail out of Sema::InstantiateVariableInitializer without calling
PopExpressionEvaluationContext().

This was causing a stale object to stay on the ExprEvalContexts stack,
causing subsequent calls to getCurrentMangleNumberContext() to fail,
resulting in incorrect numbering of static locals (and probably other
broken things).

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Reviewed by: Aaron Ballman and Dmitri Gribenko


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That's what I get for hurredly splitting the small change out of a much
bigger change that had moved where checkCorrectionVisibility was being
called.

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IBOutlet and weak attributes when accessed being
unpredictably set to nil because usage of such properties
are always single threaded and its ivar cannot be set
to nil asynchronously. // rdar://15885642 


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When another clang instance builds a module, it may still be considered
"out of date" for the current instance in a couple of cases*.  This
patch prevents us from giving spurious errors when compilers race to
build a module by allowing the module load to fail when the pcm was
built by a different compiler instance.

* Cases where a module can be out of date despite just having been
built:

1) There are different -I paths between invocations that result in
finding a different module map file for some dependent module. This is
not an error, and should never be diagnosed.

<rdar://problem/16843887>

2) There are file system races where the headers making up a module are
touched or moved. Although this can sometimes mean trouble, diagnosing
it only during a build-race is worse than useless and we cannot detect
this in general.  It is more robust to just rebuild.  This was causing
spurious issues in some setups where only the modtime of headers was
bumped during a build.

<rdar://problem/16157638>

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The parsing for -Rpass= had been factored into the function
GenerateOptimizationRemarkRegex, but at the time I forgot to remove
the original code that just handled OPT_Rpass_EQ.

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hand rolled once-initialization, and rename the mutex to be more
descriptive of its actual purpose.

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This reverts commit r211096. Looks like it broke the msvc build:

SemaOpenMP.cpp(140) : error C4519: default template arguments are only allowed on a class template

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There comes a time in the life of any amateur code generator when dumb string
concatenation just won't cut it any more. For NeonEmitter.cpp, that time has
come.

There were a bunch of magic type codes which meant different things depending on
the context. There were a bunch of special cases that really had no reason to be
there but the whole thing was so creaky that removing them would cause something
weird to fall over. There was a 1000 line switch statement for code generation
involving string concatenation, which actually did lexical scoping to an extent
(!!) with a bunch of semi-repeated cases.

I tried to refactor this three times in three different ways without
success. The only way forward was to rewrite the entire thing. Luckily the
testing coverage on this stuff is absolutely massive, both with regression tests
and the "emperor" random test case generator.

The main change is that previously, in arm_neon.td a bunch of "Operation"s were
defined with special names. NeonEmitter.cpp knew about these Operations and
would emit code based on a huge switch. Actually this doesn't make much sense -
the type information was held as strings, so type checking was impossible. Also
TableGen's DAG type actually suits this sort of code generation very well
(surprising that...)

So now every operation is defined in terms of TableGen DAGs. There are a bunch
of operators to use, including "op" (a generic unary or binary operator), "call"
(to call other intrinsics) and "shuffle" (take a guess...). One of the main
advantages of this apart from making it more obvious what is going on, is that
we have proper type inference. This has two obvious advantages:

  1) TableGen can error on bad intrinsic definitions easier, instead of just
     generating wrong code.
  2) Calls to other intrinsics are typechecked too. So
     we no longer need to work out whether the thing we call needs to be the Q-lane
     version or the D-lane version - TableGen knows that itself!

Here's an example: before:

  case OpAbdl: {
    std::string abd = MangleName("vabd", typestr, ClassS) + "(__a, __b)";
    if (typestr[0] != 'U') {
      // vabd results are always unsigned and must be zero-extended.
      std::string utype = "U" + typestr.str();
      s += "(" + TypeString(proto[0], typestr) + ")";
      abd = "(" + TypeString('d', utype) + ")" + abd;
      s += Extend(utype, abd) + ";";
    } else {
      s += Extend(typestr, abd) + ";";
    }
    break;
  }

after:

  def OP_ABDL     : Op<(cast "R", (call "vmovl", (cast $p0, "U",
                                                       (call "vabd", $p0, $p1))))>;

As an example of what happens if you do something wrong now, here's what happens
if you make $p0 unsigned before the call to "vabd" - that is, $p0 -> (cast "U",
$p0):

arm_neon.td:574:1: error: No compatible intrinsic found - looking up intrinsic 'vabd(uint8x8_t, int8x8_t)'
Available overloads:
  - float64x2_t vabdq_v(float64x2_t, float64x2_t)
  - float64x1_t vabd_v(float64x1_t, float64x1_t)
  - float64_t vabdd_f64(float64_t, float64_t)
  - float32_t vabds_f32(float32_t, float32_t)
... snip ...

This makes it seriously easy to work out what you've done wrong in fairly nasty
intrinsics.

As part of this I've massively beefed up the documentation in arm_neon.td too.

Things still to do / on the radar:
  - Testcase generation. This was implemented in the previous version and not in
    the new one, because
    - Autogenerated tests are not being run. The testcase in test/ differs from
      the autogenerated version.
    - There were a whole slew of special cases in the testcase generation that just
      felt (and looked) like hacks.
    If someone really feels strongly about this, I can try and reimplement it too.
  - Big endian. That's coming soon and should be a very small diff on top of this one.

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