introduced by previous commit.
- SelectCode now returns a SDNode*. If it is not null, the selected node
  produces the same number of results as the input node. The seletion loop
  is responsible for calling ReplaceAllUsesWith() to replace the input node
  with the output target node. For other cases, e.g. when load is folded,
  the selection code is responsible for calling ReplaceAllUsesOfValueWith()
  and SelectCode returns NULL.
- Other clean ups.

llvm-svn: 29602

llvm-svn: 29601

llvm-svn: 29597

the documentation to reflect this.

llvm-svn: 29596

llvm-svn: 29595

sufficiently long that I placed it in a separate file but it links from
the FAQ page. More might need to be added to GetElementPtr.html to
address additional confusion surrounding GEP.

llvm-svn: 29594

llvm-svn: 29592

llvm-svn: 29591

llvm-svn: 29590

llvm-svn: 29589

llvm-svn: 29588

llvm-svn: 29585

llvm-svn: 29584

llvm-svn: 29583

llvm-svn: 29580

llvm-svn: 29579

llvm-svn: 29578

llvm-svn: 29577

llvm-svn: 29574

llvm-svn: 29573

llvm-svn: 29572

llvm-svn: 29571

llvm-svn: 29570

llvm-svn: 29569

llvm-svn: 29568

llvm-svn: 29567

in the start of an array and a count of operands where applicable.  In many
cases, the number of operands is known, so this static array can be allocated
on the stack, avoiding the heap.  In many other cases, a SmallVector can be
used, which has the same benefit in the common cases.

I updated a lot of code calling getNode that takes a vector, but ran out of
time.  The rest of the code should be updated, and these methods should be
removed.

We should also do the same thing to eliminate the methods that take a
vector of MVT::ValueTypes.

It would be extra nice to convert the dagiselemitter to avoid creating vectors
for operands when calling getTargetNode.

llvm-svn: 29566

llvm-svn: 29565

llvm-svn: 29564

new definition in MakefileGuilde.html and Makefile.rules.

llvm-svn: 29563

llvm-svn: 29562

method that took std::vector<SDOperand> to take a pointer to a first operand
and #operands.

This speeds up isel on kc++ by about 3%.

llvm-svn: 29561

llvm-svn: 29560

selection is done. That's rather expensive especially in situations where it
isn't really needed.
Move back to a searching the predecessors, but make use of topological order
to trim the search space.

llvm-svn: 29559

llvm-svn: 29558

llvm-svn: 29557

smallvector too much in a release build.  Removing them speeds up isel 4%.

llvm-svn: 29556

llvm-svn: 29555

configure.ac file. This fixes some case-consistency issues between the name
of the tarball created by "make dist" and the tarball used for source when
building the LLVM RPM package.

llvm-svn: 29554

to build a loadable module is now correctly defined and documented so this
workaround isn't needed any longer.

llvm-svn: 29553