* Teach DAG combiner about X86ISD::SETCC by adding a TargetLowering hook.

llvm-svn: 24921

llvm-svn: 24919

bytes to pop off stack.
* Added support for X86 SETCC.

llvm-svn: 24917

  for Darwin.
* Added lowering hook for ISD::RET. It inserts CopyToRegs for the return
  value (or store / fld / copy to ST(0) for floating point value). This
  eliminate the need to write C++ code to handle RET with variable number
  of operands.

llvm-svn: 24888

llvm-svn: 24877

llvm-svn: 24870

llvm-svn: 24768

llvm-svn: 24754

* Handling extload (1 bit -> 8 bit) and remove C++ code that handle 1 bit
zextload.

llvm-svn: 24726

llvm-svn: 24631

llvm-svn: 24513

llvm-svn: 24438

llvm-svn: 24434

llvm-svn: 24430

contributed by Evan Cheng.

llvm-svn: 24358