-Wrap objc runtime calls with "extern "C"" (for now).

llvm-svn: 48284

llvm-svn: 48283

Improve the return slot optimization to be both more aggressive (not limited to sret parameters), and 
safer (when the passed pointer might be invalid).  Thanks to Duncan and Chris for the idea behind this, 
and extra thanks to Duncan for helping me work out the trap-safety.

llvm-svn: 48280

X86 lowering normalize vector 0 to v4i32. However DAGCombine can fold (sub x, x) -> 0 after legalization. It can create a zero vector of a type that's not expected (e.g. v8i16). We don't want to disable the optimization since leaving a (sub x, x) is really bad. Add isel patterns for other types of vector 0 to ensure correctness. It's highly unlikely to happen other than in bugpoint reduced test cases.

llvm-svn: 48279

llvm-svn: 48278

feed the PHI instructions.  We'll need these IDs in order to update LiveIntervals properly.

llvm-svn: 48277

llvm-svn: 48276

This should "fix" all but one of the test failure.

llvm-svn: 48275

llvm-svn: 48274

llvm-svn: 48273

llvm-svn: 48272

llvm-svn: 48271

LoadLibraryPermanently. The current code modifies the value of a pointer
that is passed by value, so the caller never gets the message.

Patch by Julien Lerouge!

llvm-svn: 48270

llvm-svn: 48269

llvm-svn: 48268

llvm-svn: 48267

Make ivar rewrite C++ friendly (since C++ forces a unified namespace for typedefs/structures). The previous version of the rewriter generated both a type def and structure def for each class (which doesn't fly in C++).

llvm-svn: 48266

the automated CallingConv code to handle return values typically
don't support multiple return values.

llvm-svn: 48265

llvm-svn: 48264

llvm-svn: 48263

llvm-svn: 48262

llvm-svn: 48261

llvm-svn: 48260

llvm-svn: 48259

llvm-svn: 48258

llvm-svn: 48257

that merely add passes. This allows them to be used with either
FunctionPassManager or PassManager, or even with a custom new
kind of pass manager.

llvm-svn: 48256

llvm-svn: 48255

llvm-svn: 48254

llvm-svn: 48253

before trying to merge the block into its predecessors.
This allows two-entry-phi-return.ll to be simplified
into a single basic block.

llvm-svn: 48252

optimized away before it tests what it is intended to test.

llvm-svn: 48251

llvm-svn: 48250

llvm-svn: 48249

llvm-svn: 48248

llvm-svn: 48247

llvm-svn: 48246

llvm-svn: 48245

llvm-svn: 48244

works, but probably won't if you mix it with 't' or 'u' yet.

llvm-svn: 48243