Commit Graph

7809 Commits

Author SHA1 Message Date
David Majnemer 35ab328e94 CodeGen: Correct linkage of thread_local for OS X
The backing store of thread local variables is internal for OS X and all
accesses must go through the thread wrapper.

However, individual TUs may have inlined through the thread wrapper.
To fix this, give the thread wrapper functions WeakAnyLinkage.  This
prevents them from getting inlined into call-sites.

This fixes PR19989.

llvm-svn: 210632
2014-06-11 04:08:55 +00:00
Fariborz Jahanian 0b3bc24e39 Objective-C IRGen. Patch to generate a weak symbol reference when
'super' dispatches a class method in category for OBJC_METACLASS.
This is when class is a weak_import class.
// rdar://16529125

llvm-svn: 210547
2014-06-10 17:08:04 +00:00
Craig Topper 4b56692e30 [C++11] Use 'nullptr'.
llvm-svn: 210448
2014-06-09 02:04:02 +00:00
Alp Toker 541d5070bf Avoid dubious IdentifierInfo::getNameStart() uses
These cases in particular were incurring an extra strlen() when we already knew
the length. They appear to be leftovers from when the interfaces worked with C
strings that have continued to compile due to the implicit StringRef ctor.

llvm-svn: 210403
2014-06-07 23:30:53 +00:00
Alp Toker 4925ba7ffe StringRefize TargetInfo::getABI()
llvm-svn: 210402
2014-06-07 23:30:42 +00:00
Warren Hunt b57b4b098c [MS-ABI] Implement dynamic_cast
This patch implements call lower from dynamic_cast to __RTDynamicCast 
and __RTCastToVoid.  Test cases are included.  A feature of note is that 
helper function getPolymorphicOffset is placed in such a way that it can 
be used by EmitTypeid (to be implemented in a later patch) without being 
moved.  Details are included as comments directly in the code.

llvm-svn: 210377
2014-06-06 22:12:37 +00:00
Hans Wennborg c94391d3bf MS ABI: Update the thunk linkage computation
As suggested by Reid:

 - class has GVA_Internal linkage -> internal
 - thunk has return adjustment -> weak_odr, to handle evil corner case [1]
 - all other normal methods -> linkonce_odr

 1. Evil corner case:

  struct Incomplete;
  struct A { int a; virtual A *bar(); };
  struct B { int b; virtual B *foo(Incomplete); };
  struct C : A, B { int c; virtual C *foo(Incomplete); };
  C c;

Here, the thunk for C::foo() will be emitted when C::foo() is defined, which
might be in a different translation unit, so it needs to be weak_odr.

Differential Revision: http://reviews.llvm.org/D3992

llvm-svn: 210368
2014-06-06 20:04:01 +00:00
Hans Wennborg dfcb7d6a97 Defer codegen of inline method definitions to the end of current top level declaration
We would previously fail to emit a definition of bar() for the following code:

  struct __declspec(dllexport) S {
    void foo() {
      t->bar();
    }
    struct T {
      void bar() {}
    };
    T *t;
  };

Note that foo() is an exported method, but bar() is not. However, foo() refers
to bar() so we need to emit its definition. We would previously fail to
realise that bar() is used.

By deferring the method definitions until the end of the top level declaration,
we can simply call EmitTopLevelDecl on them and rely on the usual mechanisms
to decide whether the method should be emitted or not.

Differential Revision: http://reviews.llvm.org/D4038

llvm-svn: 210356
2014-06-06 17:36:17 +00:00
Aaron Ballman b06b15aa28 Adding a new #pragma for the vectorize and interleave optimization hints.
Patch thanks to Tyler Nowicki!

llvm-svn: 210330
2014-06-06 12:40:24 +00:00
Alp Toker 15e62a37f0 Fix typos
llvm-svn: 210328
2014-06-06 12:02:07 +00:00
Alp Toker 27506271b4 Provide fallback locations for backend remarks
Instead of disembodied diagnostics when debug info is disabled it's now
possible to identify the associated function's location in order to provide
some amount of of context.

We use the definition's body right brace location to differentiate the fallback
from diagnostics that genuinely relate to the function declaration itself (a
convention also used by gcc).

llvm-svn: 210294
2014-06-05 22:11:12 +00:00
Alp Toker fb8d02b179 Implement -Wframe-larger-than backend diagnostic
Add driver and frontend support for the GCC -Wframe-larger-than=bytes warning.
This is the first GCC-compatible backend diagnostic built around LLVM's
reporting feature.

This commit adds infrastructure to perform reverse lookup from mangled names
emitted after LLVM IR generation. We use that to resolve precise locations and
originating AST functions, lambdas or block declarations to produce seamless
codegen-guided diagnostics.

An associated change, StringMap now maintains unique mangled name strings
instead of allocating copies. This is a net memory saving in C++ and a small
hit for C where we no longer reuse IdentifierInfo storage, pending further
optimisation.

llvm-svn: 210293
2014-06-05 22:10:59 +00:00
Joey Gouly 5798b26c65 When an inline-asm diagnostic is reported by the backend, report it with the
correct severity.

Previously all inline-asm diagnostics were reported as errors.

llvm-svn: 210286
2014-06-05 21:23:42 +00:00
Alexey Samsonov 8f4f1cf778 Mangle predefined string constants names to merge them at link-time
Summary:
This change generalizes the code used to create global LLVM
variables referencing predefined strings (e.g. __FUNCTION__): now it
just calls GetAddrOfConstantStringFromLiteral method. As a result,
global variables for these predefined strings may get mangled names
and linkonce_odr linkage. Fix the test accordingly.

Test Plan: clang regression tests

Reviewers: majnemer

Reviewed By: majnemer

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D4023

llvm-svn: 210284
2014-06-05 20:53:34 +00:00
Renato Golin 2e31e4e47b Add pointer types to global named register
This patch adds support for pointer types in global named registers variables.
It'll be lowered as a pair of read/write_register and inttoptr/ptrtoint calls.
Also adds some early checks on types on SemaDecl to avoid the assert.

Tests changed accordingly. (PR19837)

llvm-svn: 210274
2014-06-05 16:45:22 +00:00
Robert Lytton 6adb20f720 XCore target: Fix 'typestring' binding qualifier to the array and not the type
Differential Revision: http://reviews.llvm.org/D3949

llvm-svn: 210250
2014-06-05 09:06:21 +00:00
Richard Smith 599bed75ed Bugfix: don't assert if someone manages to declare an operator new/delete template before the builtin operator new/delete.
llvm-svn: 210230
2014-06-05 00:43:02 +00:00
Richard Smith 5659c866f4 Formatting cleanup.
llvm-svn: 210219
2014-06-04 23:26:06 +00:00
Alexey Samsonov adc9037b88 Remove the overload of GetAddrOfConstantString method
llvm-svn: 210214
2014-06-04 20:25:57 +00:00
Alexey Samsonov 175e52f57b Refactor and generalize GetAddrOfConstantString and GetAddrOfConstantStringFromLiteral.
Share mode code between these functions and re-structure them in a way
which shows how similar they actually are. The latter function works well
with literals of multi-byte chars and does a GlobalVariable name mangling
(if global strings are non-writable).

No functionality change.

llvm-svn: 210212
2014-06-04 19:56:57 +00:00
Rafael Espindola e11f40a9a4 This cast is not necessary any more (llvm api change).
llvm-svn: 210206
2014-06-04 19:03:20 +00:00
Rafael Espindola bb9e7a3d06 Update for llvm api change.
llvm-svn: 210204
2014-06-04 18:51:46 +00:00
Richard Smith 760520bcb7 Add __builtin_operator_new and __builtin_operator_delete, which act like calls
to the normal non-placement ::operator new and ::operator delete, but allow
optimizations like new-expressions and delete-expressions do.

llvm-svn: 210137
2014-06-03 23:27:44 +00:00
Alp Toker ea04672c82 Fix leak from r210059
Also revert r210096 which temporarily disabled the test while this was being
investigated.

llvm-svn: 210115
2014-06-03 17:23:34 +00:00
Richard Smith 9213a6bfa4 Remove incorrect assertion.
llvm-svn: 210092
2014-06-03 08:40:27 +00:00
Richard Smith 454a7cdfb3 Implement DR990 and DR1070. Aggregate initialization initializes uninitialized
elements from {}, rather than value-initializing them. This permits calling an
initializer-list constructor or constructing a std::initializer_list object.
(It would also permit initializing a const reference or rvalue reference if
that weren't explicitly prohibited by other rules.)

llvm-svn: 210091
2014-06-03 08:26:00 +00:00
Richard Smith 06a67e2c6f When emitting a multidimensional array new, emit the initializers for the
trailing elements as a single loop, rather than sometimes emitting a nest of
several loops. This fixes a bug where CodeGen would sometimes try to emit an
expression with the wrong type for the element being initialized. Plus various
other minor cleanups to the IR produced for array new initialization.

llvm-svn: 210079
2014-06-03 06:58:52 +00:00
Rafael Espindola 27c60b512a Update for llvm API change.
Aliases in llvm now hold an arbitrary expression.

llvm-svn: 210063
2014-06-03 02:42:01 +00:00
Alp Toker cf2048bbb3 Fix -emit-codegen-only to not generate binaries
llvm-svn: 210059
2014-06-03 02:14:20 +00:00
Alp Toker 0e64e0d4fd Eliminate redundant MangleBuffer class
The only remaining user didn't actually use the non-dynamic storage facility
this class provides.

The std::string is transitional and likely to be StringRefized shortly.

llvm-svn: 210058
2014-06-03 02:13:57 +00:00
Hans Wennborg da24e9cee3 Itanium ABI: Update getAddrOfVTable to set the DLL storage class for vtables
This corresponds to the same change for the MS ABI in r209908.

Differential Revision: http://reviews.llvm.org/D3993

llvm-svn: 210054
2014-06-02 23:13:03 +00:00
Alexey Samsonov 3c6b0c078e Delete apparently unused method
llvm-svn: 210047
2014-06-02 21:05:54 +00:00
Michael J. Spencer 5ce26687f2 [CodeGen] Don't use SizeTy for EmitNeonSplat.
llvm-svn: 210042
2014-06-02 19:48:59 +00:00
Alexey Samsonov cfe93d3e54 Remove unused variable
llvm-svn: 210041
2014-06-02 19:45:14 +00:00
Hans Wennborg febdcb0a78 Fix comment vs function name mismatch
llvm-svn: 210039
2014-06-02 18:50:54 +00:00
Alexey Samsonov 1cf07ea6bb Remove sanitizer blacklist from ASan/TSan/MSan function passes.
Instrumentation passes now use attributes
address_safety/thread_safety/memory_safety which are added by Clang frontend.
Clang parses the blacklist file and adds the attributes accordingly.

Currently blacklist is still used in ASan module pass to disable instrumentation
for certain global variables. We should fix this as well by collecting the
set of globals we're going to instrument in Clang and passing it to ASan
in metadata (as we already do for dynamically-initialized globals and init-order
checking).

This change also removes -tsan-blacklist and -msan-blacklist LLVM commandline
flags in favor of -fsanitize-blacklist= Clang flag.

llvm-svn: 210037
2014-06-02 18:08:08 +00:00
David Blaikie f9ea242d4f CGDebugInfo: Simplify/invert createLexicalBlock parameter construction.
llvm-svn: 210033
2014-06-02 16:32:05 +00:00
Michael J. Spencer dd59775f06 [CodeGen] Don't cast and use SizeTy instead of Int32Ty when constructing {extract,insert} vector element instructions.
llvm-svn: 209942
2014-05-31 00:22:12 +00:00
Hans Wennborg 853ae94660 Start adding support for dllimport/dllexport on classes (PR11170)
This implements the central part of support for dllimport/dllexport on
classes: allowing the attribute on class declarations, inheriting it
to class members, and forcing emission of exported members. It's based
on Nico Rieck's patch from http://reviews.llvm.org/D1099.

This patch doesn't propagate dllexport to bases that are template
specializations, which is an interesting problem. It also doesn't
look at the rules when redeclaring classes with different attributes,
I'd like to do that separately.

Differential Revision: http://reviews.llvm.org/D3877

llvm-svn: 209908
2014-05-30 16:59:42 +00:00
Alexey Bataev f002acae9d [OPENMP] Improve debug location codegen for OpenMP runtime library.
llvm-svn: 209876
2014-05-30 05:48:40 +00:00
Diego Novillo d23ec94393 Add flags -Rpass-missed and -Rpass-analysis.
Summary:
These two flags are in the same family as -Rpass, but are used in
different situations.

-Rpass-missed is used by optimizers to inform the user when they tried
to apply an optimization but couldn't (or wouldn't).

-Rpass-analysis is used by optimizers to report analysis results back
to the user (e.g., why the transformation could not be applied).

Depends on D3682.

Reviewers: rsmith

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D3683

llvm-svn: 209839
2014-05-29 19:55:06 +00:00
Nico Rieck b4662c3e5a MS ABI: Emit static data members with proper linkage
llvm-svn: 209826
2014-05-29 16:50:46 +00:00
Diego Novillo 9c89ff1945 Fix spurious remarks when -Weverything is used.
With -Weverything, the backend remarks are enabled. This was
causing spurious diagnostics for remarks that we don't yet
handle (cf http://reviews.llvm.org/D3683).

This will stop being a problem once http://reviews.llvm.org/D3683
is committed.

llvm-svn: 209823
2014-05-29 16:19:27 +00:00
Alexey Samsonov c054d9813c [ASan] Hoist blacklisting globals from init-order checking to Clang.
Clang knows about the sanitizer blacklist and it makes no sense to
add global to the list of llvm.asan.dynamically_initialized_globals if it
will be blacklisted in the instrumentation pass anyway. Instead, we should
do as much blacklisting as possible (if not all) in the frontend.

llvm-svn: 209789
2014-05-29 01:43:53 +00:00
Warren Hunt 583db1979c Reverting 209503 - Breaks asan blacklists
I opened a discussion on cfe-commits.  Ideally we've got a few things 
that need to happen.  CompilerRT should probably have blacklists tests.  
Asan should probably not depend on that specific field.

llvm-svn: 209766
2014-05-28 19:17:45 +00:00
Adrian Prantl 328f88add9 Debug Info: Fix the source range for IfStmt's ConditionScope.
Since the continuation block of the if statement is emitted within the
condition scope this had the undesirable effect of creating a line table
entry at the end of the then or else statement, a line that may have never
been executed.
PR19864 / rdar://problem/17052973

llvm-svn: 209764
2014-05-28 19:10:59 +00:00
Nick Lewycky 9b46eb8112 Add 'nonnull' parameter or return attribute when producing an llvm pointer type in a function type where the C++ type is a reference. Update the tests.
llvm-svn: 209723
2014-05-28 09:56:42 +00:00
Hans Wennborg 275efb9e50 Don't dllimport/export destructor variants implemented by thunks.
MSVC doesn't export these functions, so trying to import them doesnt' work.
Also, don't let any dll attributes on the CXXDestructorDecl influence the
thunk's linkage -- they should always be linkonce_odr.

This takes care of the FIXME's for this in Nico's tests.

Differential Revision: http://reviews.llvm.org/D3930

llvm-svn: 209706
2014-05-28 01:52:23 +00:00
Renato Golin e7b3d5dcb4 Revert small change to EmitDeclRefLValue
That small change, although it looked harmless, it made emitting the LValue
on the PHI node without the proper cast. Reverting it fixes PR19841.

llvm-svn: 209663
2014-05-27 16:46:27 +00:00
Hans Wennborg 905f806098 Fix some misplaced spaces around 'override'
llvm-svn: 209588
2014-05-24 20:18:32 +00:00
Tim Northover 573cbee543 AArch64/ARM64: rename ARM64 components to AArch64
This keeps Clang consistent with backend naming conventions.

llvm-svn: 209579
2014-05-24 12:52:07 +00:00
Tim Northover 25e8a6754e AArch64/ARM64: update Clang after AArch64 removal.
A few (mostly CodeGen) parts of Clang were tightly coupled to the
AArch64 backend. Now that it's gone, they will not even compile.

I've also deduplicated RUN lines in many of the AArch64 tests. This
might improve "make check-all" time noticably: some of those NEON
tests were monsters.

llvm-svn: 209578
2014-05-24 12:51:25 +00:00
Reid Kleckner 563f0e852c Use comdats to avoid double initialization of weak data
Initializers of global data that can appear multiple TUs (static data
members of class templates or __declspec(selectany) data) are now in a
comdat group keyed on the global variable being initialized.  On
non-Windows platforms, this is a code size and startup time
optimization.  On Windows, this is necessary for ABI compatibility with
MSVC.

Fixes PR16959.

Reviewers: rsmith

Differential Revision: http://reviews.llvm.org/D3811

llvm-svn: 209555
2014-05-23 21:13:45 +00:00
Hans Wennborg a926d84c4b Emit used/dllexport inline method definitions in nested classes (PR19743, PR11170)
The previous code that was supposed to handle this didn't work
since parsing of inline method definitions is delayed to the end
of the outer class definition. Thus, when HandleTagDeclDefinition()
got called for the inner class, the inline functions in that class
had not been parsed yet.

Richard suggested that the way to do this is by handling inline
method definitions through a new ASTConsumer callback.

I really wanted to call ASTContext::DeclMustBeEmitted() instead of
checking for attributes, but doing that causes us to compute linkage,
and then we fail with "error: unsupported: typedef changes linkage
of anonymous type, but linkage was already computed" on tests like
this: (from SemaCXX/undefined-internal.cpp) :-/

  namespace test7 {
    typedef struct {
      void bar();
      void foo() { bar(); }
    } A;
  }

Differential Revision: http://reviews.llvm.org/D3809

llvm-svn: 209549
2014-05-23 20:37:38 +00:00
Warren Hunt 51ec916e20 [MS-ABI] Silence warning from r209523
no functional change.

llvm-svn: 209525
2014-05-23 16:26:32 +00:00
Warren Hunt 5c2b4ea662 [MS-ABI] Implements MS-compatible RTTI
Enables the emission of MS-compatible RTTI data structures for use with 
typeid, dynamic_cast and exceptions.  Does not implement dynamic_cast 
or exceptions.  As an artiface, typeid works in some cases but proper 
support an testing will coming in a subsequent patch.

majnemer has fuzzed the results.  Test cases included.

Differential Revision: http://reviews.llvm.org/D3833

llvm-svn: 209523
2014-05-23 16:07:43 +00:00
Robert Lytton 57dd5cf441 Fix '-main-file-name <name>' so that it is used for the ModuleID.
Summary:
Previously, you could not specify the original file name when passing a preprocessed file into the compiler
Now you can use 'clang -Xclang -main-file-name -Xclang <original file name> ...'
Or 'clang -cc1 -main-file-name <original file name> ...'

llvm-svn: 209503
2014-05-23 07:34:08 +00:00
Rafael Espindola b73c973d3b Don't set unnamed_addr in CreateRuntimeVariable.
This was fairly broken. For example,

@__dso_handle would or would not get an unnamed_addr depending on how many
global destructors were used in a translation unit.

The consensus was that not every runtime variable is unnamed_addr and that
__dso_handle handle should not be, so just don't add unnamed_addr in
CreateRuntimeVariable.

llvm-svn: 209484
2014-05-22 23:33:27 +00:00
Alexander Musman 515ad8c490 This patch adds a helper class (CGLoopInfo) for marking memory instructions with llvm.mem.parallel_loop_access metadata.
It also adds a simple initial version of codegen for pragma omp simd (it will change in the future to support all the clauses).

Differential revision: http://reviews.llvm.org/D3644

llvm-svn: 209411
2014-05-22 08:54:05 +00:00
Craig Topper 8a13c4180e [C++11] Use 'nullptr'. CodeGen edition.
llvm-svn: 209272
2014-05-21 05:09:00 +00:00
Eric Christopher 4015e124e3 Update for paired llvm commit with AsmVerbose.
llvm-svn: 209261
2014-05-21 00:00:03 +00:00
Eric Christopher acca0085c1 Update for llvm change to avoid having global flag setting in TargetMachine.
llvm-svn: 209239
2014-05-20 21:25:41 +00:00
Peter Collingbourne 41af7c2fdc Implement the flatten attribute.
This is a GNU attribute that causes calls within the attributed function
to be inlined where possible. It is implemented by giving such calls the
alwaysinline attribute.

Differential Revision: http://reviews.llvm.org/D3816

llvm-svn: 209217
2014-05-20 17:12:51 +00:00
Eric Christopher c9e2a68905 Clean up language and grammar.
Based on a patch by jfcaron3@gmail.com!
PR19806

llvm-svn: 209215
2014-05-20 17:10:39 +00:00
Robert Lytton db8c1cb02c XCore target: sort typestring enum fields alphabetically
llvm-svn: 209196
2014-05-20 07:19:33 +00:00
Adrian Prantl 2dbdd20d37 Demote the "Debug Info Version" module flag to llvm::Module::Warning
behavior on mismatch. The AutoUpgrader will drop incompatible debug info
any way and also emit a warning diagnostic for it.

rdar://problem/16926122

llvm-svn: 209182
2014-05-19 23:40:06 +00:00
Renato Golin c296d951a7 Using SmallString and correct addr var
llvm-svn: 209180
2014-05-19 23:25:25 +00:00
Renato Golin 156a853ccb Fix usage of string when StringRef was needed
Also adding a variable to the test, so release bots match %1.
This should also calm the gdb buildbot.

.

llvm-svn: 209171
2014-05-19 22:36:19 +00:00
Peter Collingbourne b4728c12e8 Implement the no_split_stack attribute.
This is a GNU attribute that allows split stacks to be turned off on a
per-function basis.

Differential Revision: http://reviews.llvm.org/D3817

llvm-svn: 209167
2014-05-19 22:14:34 +00:00
Renato Golin 230c5eb4bd Non-allocatable Global Named Register
This patch implements global named registers in Clang, lowering to the just
created intrinsics in LLVM (@llvm.read/write_register). A new type of LValue
had to be created (Register), which just adds support to carry the metadata
node containing the name of the register. Two new methods to emit loads and
stores interoperate with another to emit the named metadata node.

No guarantees are being made and only non-allocatable global variable named
registers are being supported. Local named register support is unchanged.

llvm-svn: 209149
2014-05-19 18:15:42 +00:00
Oliver Stannard a3afc69b94 ARM: PCS non-compliance when struct is padded to avoid register/stack split, and requires internal padding
When we were padding a struct to avoid splitting it between registers and
the stack, we were throwing away the type which the argument should be coerced
to.

llvm-svn: 209122
2014-05-19 13:10:05 +00:00
Rafael Espindola 234405bd0f Update for llvm api change.
llvm-svn: 209077
2014-05-17 21:30:14 +00:00
Rafael Espindola 6172277e9f Update for llvm api change.
llvm-svn: 209074
2014-05-17 19:58:16 +00:00
Saleem Abdulrasool b9081f4490 CodeGen: remove MinGW and Cygwin legacy entries
These are now treated as environments.  Remove references to these enumeration
values in order to clean up the unused enumeration entries in LLVM.  The target
normalisation prior to tool invocation should ensure that the old values
continue to function properly.

llvm-svn: 209068
2014-05-17 15:46:59 +00:00
Richard Smith 053f6c6c9e If a declaration is loaded, and then a module import adds a redeclaration, then
ensure that querying the first declaration for its most recent declaration
checks for redeclarations from the imported module.

This works as follows:
 * The 'most recent' pointer on a canonical declaration grows a pointer to the
   external AST source and a generation number (space- and time-optimized for
   the case where there is no external source).
 * Each time the 'most recent' pointer is queried, if it has an external source,
   we check whether it's up to date, and update it if not.
 * The ancillary data stored on the canonical declaration is allocated lazily
   to avoid filling it in for declarations that end up being non-canonical.
   We'll still perform a redundant (ASTContext) allocation if someone asks for
   the most recent declaration from a decl before setPreviousDecl is called,
   but such cases are probably all bugs, and are now easy to find.

Some finessing is still in order here -- in particular, we use a very general
mechanism for handling the DefinitionData pointer on CXXRecordData, and a more
targeted approach would be more compact.

Also, the MayHaveOutOfDateDef mechanism should now be expunged, since it was
addressing only a corner of the full problem space here. That's not covered
by this patch.

Early performance benchmarks show that this makes no measurable difference to 
Clang performance without modules enabled (and fixes a major correctness issue
with modules enabled). I'll revert if a full performance comparison shows any
problems.

llvm-svn: 209046
2014-05-16 23:01:30 +00:00
Rafael Espindola 0fcad8837b Use getAliasee instead of getAliasedGlobal.
No functionality change.

llvm-svn: 209038
2014-05-16 22:20:18 +00:00
Eric Christopher e76eee4638 Missed a ! in the if statement when these were being set and the options
are inverted in clang and llvm.

I'll attempt to get a testcase for this that doesn't involve compiling to .s,
but it's unlikely.

llvm-svn: 209017
2014-05-16 20:46:14 +00:00
Rafael Espindola b2633b9793 Update for llvm api change.
Now that llvm cannot represent alias cycles, we have to diagnose erros just
before trying to close the cycle. This degrades the errors a bit. The real
solution is what it was before: if we want to provide good errors for these
cases, we have to be able to find a clang level decl given a mangled name
and produce the error from Sema.

llvm-svn: 209008
2014-05-16 19:35:48 +00:00
Alp Toker 6ac2cd01d2 Rename SourceManager::createFileIDForMemBuffer()
It makes more sense to just overload createFileID().

Gardening only.

llvm-svn: 209002
2014-05-16 17:23:01 +00:00
Rafael Espindola 9750ce7ebd Update for llvm API change.
llvm-svn: 208984
2014-05-16 13:34:28 +00:00
Duncan P. N. Exon Smith 9121220804 InstrProf: Set profile data to visibility hidden
Shared objects are fairly broken for InstrProf right now -- a follow-up
commit in compiler-rt will fix the rest of this.

The main problem here is that at link time, profile data symbols in the
shared object might get used instead of symbols from the main
executable, creating invalid profile data sections.

<rdar://problem/16918688>

llvm-svn: 208939
2014-05-16 01:24:00 +00:00
Reid Kleckner 966abe7614 MS ABI: Use musttail for thunk IR generation
This allows us to perfectly forward non-trivial arguments that use
inalloca.

We still can't forward non-trivial arguments through thunks when we have
a covariant return type with a non-trivial adjustment.  This would
require emitting an extra copy, which is non-conforming anyway.

llvm-svn: 208927
2014-05-15 23:01:46 +00:00
Hans Wennborg b0f2f146bb Allow dllimport/dllexport on inline functions and adjust the linkage.
This is a step towards handling these attributes on classes (PR11170).

Differential Revision: http://reviews.llvm.org/D3772

llvm-svn: 208925
2014-05-15 22:07:49 +00:00
Reid Kleckner d355ca77a9 Revert Itanium parts of "Don't copy objects with trivial, deleted copy ctors"
This undoes half of r208786.

It had problems with lazily declared special members in cases like this:
  struct A {
    A();
    A &operator=(A &&o);
    void *p;
  };
  void foo(A);
  void bar() {
    foo({});
  }

In this case, the copy and move constructors are implicitly deleted.
However, Clang doesn't eagerly declare the copy ctor in the AST, so we
pass the struct in registers.  Furthermore, GCC passes this in registers
even though this class should be uncopyable.

Revert this for now until the dust settles.

llvm-svn: 208836
2014-05-15 01:26:32 +00:00
Eric Christopher 7e72a0932b Fill in the options in the MCOptions struct directly like the other
options.

llvm-svn: 208834
2014-05-15 01:21:56 +00:00
Hans Wennborg 1a3a07471f Rename CodeGenModule::getLLVMLinkageforDeclarator -> getLLVMLinkageForDeclarator
No functionality change.

llvm-svn: 208808
2014-05-14 19:54:53 +00:00
Reid Kleckner cf87e10f9d Don't copy objects with trivial, deleted copy ctors
This affects both the Itanium and Microsoft C++ ABIs.

This is in anticipation of a change to the Itanium C++ ABI, and should
match GCC's current behavior.  The new text will likely be:

"""
Pass an object of class type by value if every copy constructor and
move constructor is deleted or trivial and at least one of them is not
deleted, and the destructor is trivial.
"""
http://sourcerytools.com/pipermail/cxx-abi-dev/2014-May/002728.html

On x86 Windows, we can mostly use the same logic, where we use inalloca
instead of passing by address.  However, on Win64, there are register
parameters, and we have to do what MSVC does.  MSVC ignores the presence
of non-trivial move constructors and only considers the presence of
non-trivial or deleted copy constructors.  If a non-trivial or deleted
copy ctor is present, it passes the argument indirectly.

This change fixes bugs and makes us more ABI compatible with both GCC
and MSVC.

Fixes PR19668.

Reviewers: rsmith

Differential Revision: http://reviews.llvm.org/D3660

llvm-svn: 208786
2014-05-14 16:02:09 +00:00
Hao Liu 9f9492b657 [ARM64]Fix the bug right shift uint64_t by 64 generates incorrect result.
llvm-svn: 208761
2014-05-14 08:59:30 +00:00
David Blaikie aabde05da1 DebugInfo: Avoid creating DILexicalScopeFiles when the filename in the current scope has not changed.
This looks like the right way for this check to work, but there is
another semi-obvious bug, I would think: why is CurLoc not zero'd out
between functions? The possibility for it to bleed between them seems
problematic. (& indeed I caused tests to fail when I fixed this a
different way, by setting CurLoc to SourceLocation() and the end of
EmitFunctionEnd... )

The changes to debug-info-blocks.m are due to a mismatch between the
source manager's file naming and CGDebugInfo's default handling when no
-main-file-name is specified. This actually reveals somewhat of a bug in
the debug info when using source files from standard in, too. See the
comment in CGDebugInfo::CreateCompileUnit for more details.

llvm-svn: 208742
2014-05-14 00:29:00 +00:00
Reid Kleckner 40ca913727 Push record return type classification into CGCXXABI
In the Microsoft C++ ABI, instance methods always return records
indirectly via the second hidden parameter.  This was implemented in
X86_32ABIInfo, but not WinX86_64ABIInfo.

Rather than exposing a handful of boolean methods in the CGCXXABI
interface, we can expose a single method that applies C++ ABI return
value classification rules.

llvm-svn: 208733
2014-05-13 22:05:45 +00:00
Rafael Espindola ee076a27ce Update for llvm API change.
llvm-svn: 208717
2014-05-13 18:45:53 +00:00
Benjamin Kramer f3ca269839 Decouple ExprCXX.h and DeclCXX.h and clean up includes a bit.
Required pulling LambdaExpr::Capture into its own header.
No functionality change.

llvm-svn: 208470
2014-05-10 16:31:55 +00:00
David Blaikie 9c8821bbef Add FIXME describing the limitation of using column info to disambiguate inlining.
Also tidy up, simplify, and extend the test coverage to demonstrate the
limitations. This test should now fail if the bugs are fixed (&
hopefully whoever ends up in this situation sees the FIXMEs and realizes
that the test needs to be updated to positively test their change that
has fixed some or all of these issues).

I do wonder whether I could demonstrate breakage without a macro here,
but any way I slice it I can't think of a way to get two calls to the
same function on the same line/column in non-macro C++ - implicit
conversions happen at the same location as an explicit function, but
you'd never get an implicit conversion on the result of an explicit call
to the same implicit conversion operator (since the value is already
converted to the desired result)...

llvm-svn: 208468
2014-05-10 02:44:57 +00:00
Reid Kleckner 37abaca3c2 MS ABI: Pass 'sret' as the second parameter of instance methods
Summary:
MSVC always passes 'sret' after 'this', unlike GCC.  This required
changing a number of places in Clang that assumed the sret parameter was
always first in LLVM IR.

This fixes win64 MSVC ABI compatibility for methods returning structs.

Reviewers: rsmith, majnemer

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D3618

llvm-svn: 208458
2014-05-09 22:46:15 +00:00
James Molloy e735b2bae3 Pacify bots again - turns out my checkout was slightly polluted when I was reverting a olista01s change, and this pollution made it upstream during the revert checkin :/ Sorryemacs -nw lib/CodeGen/CodeGenModule.cpp
llvm-svn: 208426
2014-05-09 16:28:56 +00:00
James Molloy 6f244b6f78 Reapply r208417 (olista01 'ARM: HFAs must be passed in consecutive registers'). Bots are now pacified.
llvm-svn: 208425
2014-05-09 16:21:39 +00:00
James Molloy 1aa0d5f3b2 Revert r208417 (olista01 'ARM: HFAs must be passed in consecutive registers'). This is a followon commit from r208413 which broke the LLVM bots.
llvm-svn: 208422
2014-05-09 16:17:09 +00:00
Oliver Stannard 19f3b4f2ce ARM: HFAs must be passed in consecutive registers
This is the clang counterpart to 208413, which ensures that Homogeneous
Floating-point Aggregates are passed in consecutive registers on ARM.

llvm-svn: 208417
2014-05-09 15:14:56 +00:00
Rafael Espindola e98ed2f49a Don't repeat function name in comment.
llvm-svn: 208387
2014-05-09 01:34:38 +00:00
Rafael Espindola 42ae74531c Don't indent in namespaces.
llvm-svn: 208384
2014-05-09 00:57:59 +00:00
Rafael Espindola b32629589d Simplify the code a bit by using linkage predicates.
llvm-svn: 208382
2014-05-09 00:43:37 +00:00
Rafael Espindola 1404809002 Don't indent inside namespaces.
llvm-svn: 208377
2014-05-09 00:26:20 +00:00
Rafael Espindola 2ae250c36a Use auto to avoid duplicating the type.
llvm-svn: 208374
2014-05-09 00:08:36 +00:00
Saleem Abdulrasool 61449c6b9a CodeGen: fix code model mapping
Large is CodeModel::Model::Large, not CodeModel::Model::Medium.  Thanks to
majnemer for pointing out the typo!  Its unclear how to test the mapped value in
the compiler, the tests already cover the driver side.

llvm-svn: 208335
2014-05-08 16:28:48 +00:00
Rafael Espindola bf6e67f2e9 Simplify a few cast<>s.
llvm-svn: 208331
2014-05-08 15:44:45 +00:00
Rafael Espindola e033c8c58c Cleanup setFunctionDefinitionAttributes.
Use more specific type, update comments and name style.

llvm-svn: 208328
2014-05-08 15:26:12 +00:00
Rafael Espindola 8dcd6e767b Replace virtual with override.
llvm-svn: 208324
2014-05-08 15:01:48 +00:00
Rafael Espindola 649263626a Use more specific type.
llvm-svn: 208321
2014-05-08 14:46:46 +00:00
Rafael Espindola 489c66b268 Small simplification: Reduce the use of cast<>.
llvm-svn: 208320
2014-05-08 14:33:38 +00:00
Diego Novillo 6dc9c4814f Fix segmentation fault when mixing -Rpass with #line.
Summary:
When using #line directives, FileManager::getFile() will return a nil
entry. This triggers an assert in translateFileLineCol().

This patch handles nil FileEntry instances by emitting a note that the
location could not be translated back to a SourceLocation. I don't
really like this solution, but we are translating presumed locations,
so some information has already been lost.

Reviewers: rsmith

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D3625

llvm-svn: 208315
2014-05-08 13:49:54 +00:00
Rafael Espindola c47b0a1b99 Use predicate function to simplify a bit.
llvm-svn: 208312
2014-05-08 13:07:37 +00:00
Saleem Abdulrasool 62849c677c Driver: parse -mcmodel earlier
This addresses an existing FIXME item in the driver.  The code model flag was
parsed in the actual tool rather than in the driver.  This was problematic since
the value may be invalid.  In that case, we would silently treat it as a default
value in non-assert builds, and abort in assert builds.  Add a check in the
driver to validate that the value being passed is valid, and if not provide a
proper error message.

llvm-svn: 208275
2014-05-08 02:28:32 +00:00
Duncan P. N. Exon Smith 4434d361d0 CodeGen: Don't set hidden visibility on symbols with local linkage
llvm-svn: 208258
2014-05-07 22:36:11 +00:00
James Molloy 491cefbe7a When doing int<->ptr coercion for big-endian, calculate the shift amount correctly.
Previously we calculated the shift amount based upon DataLayout::getTypeAllocSizeInBits.
This will only work for legal types - types such as i24 that are created as part of
structs for bitfields will return "32" from that function. Change to using
getTypeSizeInBits.

It turns out that AArch64 didn't run across this problem because it always returned
[1 x i64] as the type for a bitfield, whereas ARM64 returns i64 so goes down this
(better, but wrong) codepath.

llvm-svn: 208231
2014-05-07 17:41:15 +00:00
David Blaikie 87dab87a66 PR19562: Fix another temporary node leak in Clang debug info emission
While constructing ObjC Interface types we might create the declaration
of some normal C++ types, thus adding things to the ReplaceMap. Make
sure we process the ReplaceMap after the ObjC interfaces.

In theory we know at this point, since we're at the end of the TU, that
we won't be upgrading any declarations to definitions, so we could just
construct non-temporary nodes, but that would require extra state in
CGDebugInfo to conditionalize the creation of declaration nodes which
seems annoying/more work than is appropriate.

llvm-svn: 208226
2014-05-07 16:56:58 +00:00
James Molloy 467be60748 [ARM64-BE] Correctly deal with single element HFAs in varargs.
Just because the first "if" didn't fire, doesn't mean we can not have
an HFA in the "else" clause.

llvm-svn: 208216
2014-05-07 14:45:55 +00:00
Ed Maste da70602222 DebugInfo: Use enum instead of unsigned
This makes debuging DebugInfo generation with LLDB a little more pleasant.

Differential Revision: http://reviews.llvm.org/D3626

llvm-svn: 208203
2014-05-07 12:49:30 +00:00
Oliver Stannard 39d26c98c5 ARM: Fix assertion caused by passing bitfield struct using ABIArgInfo::getExpandWithPadding
In cases where a struct must, according to the AAPCS, not be split between
general purpose and floating point registers, we use
ABIArgInfo::getExpandWithPadding to add the padding arguments. However,
ExpandWithPadding does not work if the struct contains bitfields, so we
instead must use ABIArgInfo::getDirect.

llvm-svn: 208185
2014-05-07 10:39:12 +00:00
Alexey Bataev 15007ba94a [OPENMP] Fixed problem with temp removal on some platforms in codegen for '#pragma omp parallel'
llvm-svn: 208162
2014-05-07 06:18:01 +00:00
David Blaikie 5944d9ce3e PR19562: Fix memory leak when ObjC interface types cause the creation of further interfaces.
llvm-svn: 208161
2014-05-07 06:18:00 +00:00
Nico Weber bdc969839a Include translation unit filename in global ctor symbol names.
This makes it easier to see where a global ctor comes from, and it also makes
ASan's init order analyzer output easier to understand.  gcc does this too,
but only in -fPIC mode for some reason.  Don't do this for constructors with
explicit init priority.

Also prepend "sub_" before the 'I', that way regular constructors stay
lexicographically after symbols with init priority (because
ord('s') > ord('I')).  gold seems to ignore the name of constructor symbols,
and ld only looks at the symbol if it includes an init priority, which this
patch doesn't change.

Before: __GLOBAL_I_a
Now: __GLOBAL_sub_I_myfile.cc
llvm-svn: 208128
2014-05-06 20:32:45 +00:00
David Blaikie 483a9da598 Reapply: DebugInfo: Emit the definition of enums when the definition preceeds the declaration and initial use.
Reverting r208106 to reapply r208065 with a fix for the regression. The
issue was that the enum tried to be built even if the declaration hadn't
been constructed for debug info - presenting problems for enum templates
and typedefs of enums with names for linkage purposes.

Original commit message:

This regressed a little further 208055 though it was already a little
broken.

While the requiresCompleteType optimization should be implemented here.
Future (possibly near future) work.

llvm-svn: 208114
2014-05-06 18:35:21 +00:00
David Blaikie 29020cc571 Revert "DebugInfo: Emit the definition of enums when the definition preceeds the declaration and initial use."
This is breaking the compiler-rt build. Reverting while I
investigate/fix.

This reverts commit r208065.

llvm-svn: 208106
2014-05-06 17:02:15 +00:00
Alexey Bataev 9959db5fa9 [OPENMP] Initial codegen for '#pragma omp parallel'
llvm-svn: 208077
2014-05-06 10:08:46 +00:00
Robert Lytton d263f14a0f XCore target: fix initialization bug found by MSan Bot.
llvm-svn: 208072
2014-05-06 09:38:54 +00:00
David Blaikie 57407525fd DebugInfo: Emit the definition of enums when the definition preceeds the declaration and initial use.
This regressed a little further 208055 though it was already a little
broken.

While the requiresCompleteType optimization should be implemented here.
Future (possibly near future) work.

llvm-svn: 208065
2014-05-06 07:33:30 +00:00
David Blaikie f427b00b9a PR19598: Ensure temporary metadata nodes used in debug info are destroyed.
CGDebugInfo and DIBuilder were lax in their handling of temporary
MDNodes. All temporary nodes need to be deleted, which means they need
to be RAUW'd with a permanent node. This was not happening.

To ensure this, leverage DIBuilder's new ability to create both
permanent and temporary declarations. Ensure all temporary declarations
are RAUW'd, even with itself. (DIDescriptor::RAUW handles the case where
it is replaced with itself and creates a new, duplicate permanent node
to replace itself with)

This means that all temporary declarations must be added to the
ReplacementMap even if they're never upgraded to definitions - so move
the point of insertion into the map to the point of creation of the
declarations.

llvm-svn: 208055
2014-05-06 03:42:01 +00:00
David Blaikie ef8a951882 Build debug info for ObjC interface types at the end of the translation unit to ensure all ivars are included.
This takes a different approach than the
completedType/requiresCompleteType work which relies on AST callbacks to
upgrade the type declaration to a definition. Instead, just defer
constructing the definition to the end of the translation unit.

This works because the definition is never needed by other debug info
(so far as I know), whereas the definition of a struct may be needed by
other debug info before the end of the translation unit (such as
emitting the definition of a member function which must refer to that
member function's declaration).

If we had a callback for whenever an IVar was added to an ObjC interface
we could use that, and remove the need for the ObjCInterfaceCache, which
might be nice. (also would need a callback for when it was more than
just a declaration so we could get properties, etc).

A side benefit is that we also don't need the CompletedTypeCache
anymore. Just rely on the declaration-ness of a type to decide whether
its definition is yet to be emitted.

There's still the PR19562 memory leak, but this should hopefully make
that a bit easier to approach.

llvm-svn: 208015
2014-05-05 23:23:53 +00:00
David Blaikie b8149044e0 Simplify replacement map by avoiding duplicate values and ensuring the values it does contain are necessary.
Items were being redundantly added to the replacement map (both when the
declaration was created, and then again when its definition was
constructed) which caused extra handling to be required when walking the
map (as elements may've already been replaced due to prior entries). By
avoiding adding the duplicates, the checks in the replacement handling
can be replaced with assertions.

llvm-svn: 208000
2014-05-05 21:21:39 +00:00
Reid Kleckner a82b5d840f MS ABI: Emit an error during IRgen on C++ exception handling
Currently, users get error messages about RTTI descriptor mangling with
no useful source location.  This addresses that.

Another approach would be to disable C++ exceptions by default in the
driver when using the Microsoft C++ ABI.  However, this makes it
impossible to parse system headers that use exception handling
constructs.  By delaying the error to IRgen, we can figure out if we
actually need to emit code for this construct.  Additionally, users who
are only interested in building refactoring tools on Windows still get a
correct AST without having to add flags.  Finally, this is consistent
with what we do for SEH.

llvm-svn: 207999
2014-05-05 21:12:12 +00:00
Rafael Espindola 502f65ae54 Fix pr19653.
Warn if an alias requests a section other than the aliasee section.

llvm-svn: 207997
2014-05-05 20:21:03 +00:00
Rafael Espindola c67b815217 Small refactoring, no functionality change.
llvm-svn: 207991
2014-05-05 19:33:09 +00:00
David Majnemer ceaaa8d09e CodeGen: Assign linkage to thread-wrappers correctly
We would sometimes incorrectly give a thread-wrapper external linkage
instead of internal linkage if we had only CodeGen'd it's declaration,
not it's definition.

This fixes PR19655.

llvm-svn: 207988
2014-05-05 18:54:23 +00:00
Duncan P. N. Exon Smith 48bc268290 CodeGen: Cleanup visibility in RTTIBuilder
No functionality change.

llvm-svn: 207978
2014-05-05 17:38:39 +00:00
Saleem Abdulrasool 956c2ec532 CodeGen: complete ARM ACLE hint 8.4 support
Add support for the remaining hints from the ACLE.  Although __dbg is listed as
a hint, it is handled different, so it is not covered by this change.

llvm-svn: 207930
2014-05-04 02:52:25 +00:00
Chandler Carruth e6c980c41d [leaks] Re-shuffle code such that we don't create a basic block for
initializing an array unless we need it. Specifically, position the
creation of a new basic block after we've checked all of the cases that
bypass the need for it.

Fixes another leak in test/CodeGen* found by LSan.

llvm-svn: 207900
2014-05-03 09:16:57 +00:00
Reid Kleckner e39ee21551 MS ABI x64: Pass small objects with dtors but no copy ctors directly
Passing objects directly (in registers or memory) creates a second copy
of the object in the callee.  The callee always destroys its copy, but
we also have to destroy any temporary created in the caller.  In other
words, copy elision of these kinds of objects is impossible.

Objects larger than 8 bytes with non-trivial dtors and trivial copy
ctors are still passed indirectly, and we can still elide copies of
them.

Fixes PR19640.

llvm-svn: 207889
2014-05-03 00:33:28 +00:00
Chandler Carruth 7d8668288a [leaks] Fix a leak of a basic block when we successfully fold a switch
condition to a constant and emit only the relevant statement. In that
case, we were previously creating the epilog jump destination, a cleanup
scope, and emitting any condition variable into it. Instead, we can emit
the condition variable (if we have one) into the cleanup scope used for
the entire folded case sequence. We avoid creating a jump dest, a basic
block, and an extra cleanup scope. Win!

llvm-svn: 207888
2014-05-03 00:14:49 +00:00
Eric Christopher 25c4e67d69 Small formatting change.
llvm-svn: 207852
2014-05-02 17:52:19 +00:00
Robert Lytton f80d68847d XCore target: fix bug in dereferencing null pointer.
Also add basic cpp ABI tests where they differ from C ABI output.

llvm-svn: 207834
2014-05-02 09:33:30 +00:00
Robert Lytton 844aeeb15a XCore target: Add TypeString meta data to IR output.
This includes the addition of the virtual function:
	TargetCodeGenInfo::EmitTargetMD()

llvm-svn: 207832
2014-05-02 09:33:20 +00:00
Saleem Abdulrasool 38ed6de3a0 CodeGen: rename __builtin_arm_sevl to __sevl
ACLE adds the __sevl() extension.  Rename the hint from a custom name to the
ACLE specified name.

llvm-svn: 207829
2014-05-02 06:53:57 +00:00
Reid Kleckner ec87fece21 Remove unused variable that I missed in my rush to fix the bots
llvm-svn: 207820
2014-05-02 01:17:12 +00:00
Reid Kleckner 7f5f0f3f6e Win64: Use ConvertType instead of checking the MS inheritance
dependent-type-member-pointer.cpp is failing on a win64 bot because
-fms-extensions is not enabled.  Use ConvertType rather than relying on
the inheritance attributes.  It's less code, but probably slower.

llvm-svn: 207819
2014-05-02 01:14:59 +00:00
Reid Kleckner 9005f41837 Win64: Pass member pointers larger than 8 bytes by reference
The Win64 ABI docs on MSDN say that arguments bigger than 8 bytes are
passed by reference.  Prior to this change, we were only applying this
logic to RecordType arguments.  This affects both the Itanium and
Microsoft C++ ABIs.

Reviewers: majnemer

Differential Revision: http://reviews.llvm.org/D3587

llvm-svn: 207817
2014-05-02 00:51:20 +00:00
Reid Kleckner 34a38d8efb MS ABI: Fix logic bug in member pointer null test code
This code is trying to test if the pointer is *not* null.  Therefore we
should use 'or' instead of 'and' to combine the results of 'icmp ne'.
This logic is consistent with the general member pointer comparison code
in EmitMemberPointerComparison.

llvm-svn: 207815
2014-05-02 00:05:16 +00:00
David Blaikie 1c286f6d8f PR19623: Support typedefs (and alias templates) of void.
llvm-svn: 207781
2014-05-01 18:25:19 +00:00
David Majnemer daff37013c AST: Mangle reference temporaries reliably
Summary:
Previously, we would generate a single name for all reference
temporaries and allow LLVM to rename them for us.  Instead, number the
reference temporaries as we build them in Sema.

Reviewers: rsmith

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D3554

llvm-svn: 207776
2014-05-01 17:50:17 +00:00
Reid Kleckner ac64060c80 MS ABI x64: Don't destroy arguments twice on x64
We were destroying them in the callee, and then again in the caller.  We
should use an EH-only cleanup and disable it at the point of the call
for win64, even though we don't use inalloca.

llvm-svn: 207733
2014-05-01 03:07:18 +00:00
James Molloy fa40368d9d [ARM64] Add arm64_be where it was accidentally missed from a bunch of if-conditions.
I think this is the last commit for ARM64 big endian in clang. This commit makes
arm_neon.h compile correctly.

llvm-svn: 207624
2014-04-30 10:11:40 +00:00