llvm-svn: 48296

llvm-svn: 48295

getCopyToParts problem was noticed by the new
LegalizeTypes infrastructure.  In order to avoid
this kind of thing in the future I've added a
check that EXTRACT_ELEMENT is only used with
integers.  Once LegalizeTypes is up and running
most likely BUILD_PAIR and EXTRACT_ELEMENT can
be removed, in favour of using apints instead.

llvm-svn: 48294

1. There is now a "PAListPtr" class, which is a smart pointer around
   the underlying uniqued parameter attribute list object, and manages
   its refcount.  It is now impossible to mess up the refcount.
2. PAListPtr is now the main interface to the underlying object, and
   the underlying object is now completely opaque.
3. Implementation details like SmallVector and FoldingSet are now no
   longer part of the interface.
4. You can create a PAListPtr with an arbitrary sequence of
   ParamAttrsWithIndex's, no need to make a SmallVector of a specific 
   size (you can just use an array or scalar or vector if you wish).
5. All the client code that had to check for a null pointer before
   dereferencing the pointer is simplified to just access the 
   PAListPtr directly.
6. The interfaces for adding attrs to a list and removing them is a
   bit simpler.

Phase #2 will rename some stuff (e.g. PAListPtr) and do other less 
invasive changes.

llvm-svn: 48289

llvm-svn: 48285

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

llvm-svn: 48274

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

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

llvm-svn: 48241