instead of ZERO_EXTEND to eliminate extraneous extensions.  This eliminates
dead zero extensions on formal arguments and other cases on PPC, implementing
the newly tightened up test/Regression/CodeGen/PowerPC/small-arguments.ll test.

llvm-svn: 23205

llvm-svn: 23186

llvm-svn: 23114

changes the code generated for:

short %test(short %A) {
  %B = xor short %A, -32768
  ret short %B
}

to:

_test:
        xori r2, r3, 32768
        xoris r2, r2, 65535
        extsh r3, r2
        blr

instead of:

_test:
        rlwinm r2, r3, 0, 16, 31
        xori r2, r3, 32768
        xoris r2, r2, 65535
        extsh r3, r2
        blr

llvm-svn: 23109

flag is set on an instruction.

llvm-svn: 23098

the target isel crashes due to unimplemented features like calls :)

llvm-svn: 22997

promoted to the right type.  This fixes: IA64/2005-08-22-LegalizerCrash.ll

llvm-svn: 22969

llvm-svn: 22863

Nate noticed in yacr2 (and I know occurs in other places as well).

This is still rough, as the critical edge blocks are not intelligently placed
but is added to get some idea to see if this improves performance.

llvm-svn: 22825

llvm-svn: 22822

used to tack a register number onto the node.

Instead of doing this, make a new node, RegisterSDNode, which is a leaf
containing a register number.  These three operations just become normal
DAG nodes now, instead of requiring special handling.

Note that with this change, it is no longer correct to make illegal
CopyFromReg/CopyToReg nodes.  The legalizer will not touch them, and this
is bad, so don't do it. :)

llvm-svn: 22806

CC out of the SetCC operation, making SETCC a standard ternary operation and
CC's a standard DAG leaf.  This will make it possible for other node to use
CC's as operands in the future...

llvm-svn: 22728

llvm-svn: 22523

llvm-svn: 22469

1. Pass Value*'s into lowering methods so that the proper pointers can be
   added to load/stores from the valist
2. Intrinsics that return void should only return a token chain, not a token
   chain/retval pair.
3. Rename LowerVAArgNext -> LowerVAArg, because VANext is long gone.

llvm-svn: 22338

llvm-svn: 22315

tracking the instructions causing loads and stores provides more information than just the pointer being loaded or stored

llvm-svn: 22311

See last commit for LangRef, this implements it on all targets.

llvm-svn: 22273

llvm-svn: 22254

llvm-svn: 22026

llvm-svn: 22015

llvm-svn: 22004

llvm-svn: 21993

llvm-svn: 21958

llvm-svn: 21931

llvm-svn: 21930

llvm-svn: 21900

llvm-svn: 21870

llvm-svn: 21833

llvm-svn: 21825

being stored/loaded through!

llvm-svn: 21806

llvm-svn: 21804

Lower debug info to noops.

llvm-svn: 21698

population (ctpop).  Generic lowering is implemented, however only promotion
is implemented for SelectionDAG at the moment.

More coming soon.

llvm-svn: 21676

was contributed by Morten Ofstad, with some minor tweaks and bug fixes added
by me.

llvm-svn: 21636

Implement Value* tracking for loads and stores in the selection DAG.  This enables one to use alias analysis in the backends.

(TRUNK)Stores and (EXT|ZEXT|SEXT)Loads have an extra SDOperand which is a SrcValueSDNode which contains the Value*.  Note that if the operation is introduced by the backend, it will still have the operand, but the value* will be null.

llvm-svn: 21599

llvm-svn: 21439

llvm-svn: 21420

Make llvm undef values generate ISD::UNDEF nodes

llvm-svn: 21261

llvm-svn: 21167