[PowerPC] Expand ISEL instruction into if-then-else sequence.

Generally, the ISEL is expanded into if-then-else sequence, in some
cases (like when the destination register is the same with the true
or false value register), it may just be expanded into just the if
or else sequence.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292128 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/PowerPC/CMakeLists.txt

@@ -40,6 +40,7 @@ add_llvm_target(PowerPCCodeGen
   PPCVSXCopy.cpp
   PPCVSXFMAMutate.cpp
   PPCVSXSwapRemoval.cpp
+  PPCExpandISEL.cpp
   )
 
 add_subdirectory(AsmParser)

lib/Target/PowerPC/PPC.h

@@ -45,11 +45,13 @@ namespace llvm {
   FunctionPass *createPPCISelDag(PPCTargetMachine &TM);
   FunctionPass *createPPCTLSDynamicCallPass();
   FunctionPass *createPPCBoolRetToIntPass();
+  FunctionPass *createPPCExpandISELPass();
   void LowerPPCMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
                                     AsmPrinter &AP, bool isDarwin);
 
   void initializePPCVSXFMAMutatePass(PassRegistry&);
   void initializePPCBoolRetToIntPass(PassRegistry&);
+  void initializePPCExpandISELPass(PassRegistry &);
   extern char &PPCVSXFMAMutateID;
 
   namespace PPCII {