Refactor some code to expose an interface to constant fold and instruction given it's opcode, typeand operands.

llvm-svn: 28517

SimplifySelectOps would eliminate a Select, delete it, then return true.

The clients would see that it did something and return null.

The top level would see a null return, and decide that nothing happened,
proceeding to process the node in other ways: boom.

The fix is simple: clients of SimplifySelectOps should return the select
node itself.

In order to catch really obnoxious boogs like this in the future, add an
assert that nodes are not deleted.  We do this by checking for a sentry node
type that the SDNode dtor sets when a node is destroyed.

llvm-svn: 28514

llvm-svn: 28512

instead of MVT::i1. Either is fine except MVT::i32 is probably a legal type
for most (if not all) platforms while MVT::i1 is not.

llvm-svn: 28511

RET chain, value1, sign1, value2, sign2, ...

llvm-svn: 28510

RET chain, value1, sign1, value2, sign2

llvm-svn: 28509

llvm-svn: 28507

there's still a lot of work to be done on it.

llvm-svn: 28506

llvm-svn: 28505

vector arguments, not three.

llvm-svn: 28504

llvm-svn: 28503

nonccc calls (we were dropping the CC and tail flag).  This broke several
FORTRAN programs.

Testcase here: Regression/Assembler/2006-05-26-VarargsCallEncode.ll

llvm-svn: 28501

llvm-svn: 28499

llvm-svn: 28498

llvm-svn: 28497

llvm-svn: 28496

and documentation updates soo.

llvm-svn: 28495

Add lr as a hard coded operand of bx

llvm-svn: 28494

llvm-svn: 28493

llvm-svn: 28492

llvm-svn: 28491

llvm-svn: 28490

No functionality change.

llvm-svn: 28489

llvm-svn: 28488

the program.  This exposes more opportunities for the instcombiner, and implements
vec_shuffle.ll:test6

llvm-svn: 28487

extractelement from the SV's source.  This implement vec_shuffle.ll:test[45]

llvm-svn: 28485

llvm-svn: 28483

llvm-svn: 28482

llvm-svn: 28481

Patch contributed by Anton Korobeynikov!

llvm-svn: 28480

array scopes possibly accessing valid memory in outer subscripts.

llvm-svn: 28478

llvm-svn: 28475

llvm-svn: 28473

llvm-svn: 28471

llvm-svn: 28470

llvm-svn: 28469

llvm-svn: 28465

the copyto/fromregs instead of making the X86ISD::CALL selection code create
them.

llvm-svn: 28463

llvm-svn: 28462

llvm-svn: 28461