lib/CodeGen/RegisterCoalescer.cpp

   1 //===- RegisterCoalescer.cpp - Generic Register Coalescing Interface -------==//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the generic RegisterCoalescer interface which
  11 // is used as the common interface used by all clients and
  12 // implementations of register coalescing.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #include "llvm/CodeGen/RegisterCoalescer.h"
  17 #include "llvm/CodeGen/LiveIntervalAnalysis.h"
  18 #include "llvm/CodeGen/MachineInstr.h"
  19 #include "llvm/Target/TargetRegisterInfo.h"
  20 #include "llvm/Pass.h"
  21
  22 using namespace llvm;
  23
  24 // Register the RegisterCoalescer interface, providing a nice name to refer to.
  25 static RegisterAnalysisGroup<RegisterCoalescer> Z("Register Coalescer");
  26 char RegisterCoalescer::ID = 0;
  27
  28 // RegisterCoalescer destructor: DO NOT move this to the header file
  29 // for RegisterCoalescer or else clients of the RegisterCoalescer
  30 // class may not depend on the RegisterCoalescer.o file in the current
  31 // .a file, causing alias analysis support to not be included in the
  32 // tool correctly!
  33 //
  34 RegisterCoalescer::~RegisterCoalescer() {}
  35
  36 // Because of the way .a files work, we must force the SimpleRC
  37 // implementation to be pulled in if the RegisterCoalescer classes are
  38 // pulled in.  Otherwise we run the risk of RegisterCoalescer being
  39 // used, but the default implementation not being linked into the tool
  40 // that uses it.
  41 DEFINING_FILE_FOR(RegisterCoalescer)