for dlopen/dlerror.

Patch by arrowdodger!

llvm-svn: 124590

llvm-svn: 124589

llvm-svn: 124588

llvm-svn: 124587

llvm-svn: 124586

llvm-svn: 124585

allow ref-qualifiers on function types used as template type
arguments. GNU actually allows cv-qualifiers on function types in many
places where it shouldn't, so we currently categorize this as a GNU
extension.

llvm-svn: 124584

llvm-svn: 124583

llvm-svn: 124582

llvm-svn: 124581

Fix the diagnostic when we are shadowing an external variable and there exists a locally scoped extern with the same name.

llvm-svn: 124580

llvm-svn: 124579

llvm-svn: 124578

Fixes rdar://8736362.

llvm-svn: 124577

Error for use of field from anonymous struct or union should say "invalid use of nonstatic data member"
not "call to non-static member function without an object argument".

llvm-svn: 124576

Allow taking the address of such a field for a pointer-to-member constant. Fixes rdar://8818236.

llvm-svn: 124575

llvm-svn: 124574

This fixes a few compile errors when parsing <regex> from MSVC 2008 with clang.

llvm-svn: 124573

llvm-svn: 124570

llvm-svn: 124569

(A+B) == A  ->  B == 0
A == (A+B)  ->  B == 0

llvm-svn: 124567

current translation unit as available_externally. 

This helps devirtualize the second example in PR3100, comment 18:

struct S { S() {}; virtual void xyzzy(); };
inline void foo(S *s) { s->xyzzy(); }
void bar() { S s; foo(&s); }

This involved four major changes:

1. In DefineUsedVTables, always mark virtual member functions as referenced for
   non-template classes and class template specializations.
2. In CodeGenVTables::ShouldEmitVTableInThisTU return true if optimizations are
   enabled, even if the key function is not implemented in this translation 
   unit. We don't ever do this for code compiled with -fapple-kext, because we
   don't ever want to devirtualize virtual member function calls in that case.
3. Give the correct linkage for vtables where the key function is not defined.
4. Update the linkage for RTTI structures when necessary.

llvm-svn: 124565

This is similar to the -unroll-threshold option. There should be no change in
behavior when -tail-dup-size is not explicit on the llc command line.

llvm-svn: 124564

and implemented it for the EmulateInstructionARM class.

llvm-svn: 124563

of the EmulateInstruction class.

llvm-svn: 124562

by PR9088 fixes things.

llvm-svn: 124561

to do this and more, but would only do it if X/Y had only one use.  Spotted as the
most common missed simplification in SPEC by my auto-simplifier, now that it knows
about nuw/nsw/exact flags.  This removes a bunch of multiplications from 447.dealII
and 483.xalancbmk.  It also removes a lot from tramp3d-v4, which results in much
more inlining.

llvm-svn: 124560

Teach DAGCombine to fold fold (sra (trunc (sr x, c1)), c2) -> (trunc (sra x, c1+c2) when c1 equals the amount of bits that are truncated off.

This happens all the time when a smul is promoted to a larger type.

On x86-64 we now compile "int test(int x) { return x/10; }" into
  movslq  %edi, %rax
  imulq $1717986919, %rax, %rax
  movq  %rax, %rcx
  shrq  $63, %rcx
  sarq  $34, %rax <- used to be "shrq $32, %rax; sarl $2, %eax"
  addl  %ecx, %eax

This fires 96 times in gcc.c on x86-64.

llvm-svn: 124559

invocation. 

This mimics what gcc does and fixes libtool check for libraries.

llvm-svn: 124558

llvm-svn: 124557

llvm-svn: 124556

llvm-svn: 124555

llvm-svn: 124554

When emitting RTTI for a non-class type, compute the visibility of the RTTI data based on the explicit visibility of the type.

llvm-svn: 124553

llvm-svn: 124552

llvm-svn: 124551

llvm-svn: 124550

I'm still not sure if having the typenames be visible with -hidden-weak-vtables, but I think it makes sense.

llvm-svn: 124549

Set the visibility for typeinfo names.

llvm-svn: 124548

This is the one where one of the branches of the select is another select on
the same condition.

llvm-svn: 124547