the 177.mesa failure from last night, and fixes the
CodeGen/PowerPC/2005-10-08-ArithmeticRotate.ll regression test I added.
If this code cannot be fixed, it should be removed for good, but I'll leave
it to Nate to decide its fate.

llvm-svn: 23670

llvm-svn: 23669

merge, and using subtarget info for ptr size.

llvm-svn: 23668

llvm-svn: 23667

llvm-svn: 23666

llvm-svn: 23665

is faster and uses less stack space.  This reduces our stack requirement
enough to compile sixtrack, and though it's a hack, should be enough until
we switch to iterative isel

llvm-svn: 23664

llvm-svn: 23663

C-X's

llvm-svn: 23662

llvm-svn: 23661

llvm-svn: 23660

implements CodeGen/PowerPC/div-2.ll

llvm-svn: 23659

llvm-svn: 23658

llvm-svn: 23657

llvm-svn: 23656

this out to me

llvm-svn: 23655

classes on PPC.  We were emitting fmr instructions to do fp extensions, which
weren't getting coallesced.  This fixes Regression/CodeGen/PowerPC/fpcopy.ll

llvm-svn: 23654

llvm-svn: 23653

llvm-svn: 23652

llvm-svn: 23651

llvm-svn: 23650

llvm-svn: 23649

llvm-svn: 23648

helps but not enough.

Start pulling cases out of PPC32DAGToDAGISel::Select.  With GCC 4, this function
required 8512 bytes of stack space for each invocation (GCC 3 required less
than 700 bytes).  Pulling this first function out gets us down to 8224.  More
to come :(

llvm-svn: 23647

llvm-svn: 23646

previous copy elisions and we discover we need to reload a register, make
sure to use the regclass of the original register for the reload, not the
class of the current register.  This avoid using 16-bit loads to reload 32-bit
values.

llvm-svn: 23645

llvm-svn: 23644

llvm-svn: 23643

llvm-svn: 23642

llvm-svn: 23641

llvm-svn: 23640

llvm-svn: 23639

  store r12 -> [ss#2]
  R3 = load [ss#1]
  use R3
  R3 = load [ss#2]
  R4 = load [ss#1]

and turn it into this code:

  store R12 -> [ss#2]
  R3 = load [ss#1]
  use R3
  R3 = R12
  R4 = R3    <- oops!

The problem was that promoting R3 = load[ss#2] to a copy missed the fact that
the instruction invalidated R3 at that point.

llvm-svn: 23638

llvm-svn: 23637

with the dag combiner.  This speeds up espresso by 8%, reaching performance
parity with the dag-combiner-disabled llc.

llvm-svn: 23636

llvm-svn: 23635

dead node elim and dag combiner passes where the root is potentially updated.
This fixes a fixme in the dag combiner.

llvm-svn: 23634

llvm-svn: 23633

that testcase still does not pass with the dag combiner.  This is because
not all forms of br* are folded yet.

Also, when we combine a node into another one, delete the node immediately
instead of waiting for the node to potentially come up in the future.

llvm-svn: 23632

the second phase of dag combining

llvm-svn: 23631