Several changes to Mips backend, experimental fp support being the most

important.
- Cleanup in the Subtarget info with addition of new features, not all support
  yet, but they allow the future inclusion of features easier. Among new features,
  we have : Arch family info (mips1, mips2, ...), ABI info (o32, eabi), 64-bit
  integer
  and float registers, allegrex vector FPU (VFPU), single float only support.
- TargetMachine now detects allegrex core.
- Added allegrex (Mips32r2) sext_inreg instructions.
- *Added Float Point Instructions*, handling single float only, and
  aliased accesses for 32-bit FPUs.
- Some cleanup in FP instruction formats and FP register classes.
- Calling conventions improved to support mips 32-bit EABI.
- Added Asm Printer support for fp cond codes.
- Added support for sret copy to a return register.
- EABI support added into LowerCALL and FORMAL_ARGS.
- MipsFunctionInfo now keeps a virtual register per function to track the
  sret on function entry until function ret.
- MipsInstrInfo FP support into methods (isMoveInstr, isLoadFromStackSlot, ...),
  FP cond codes mapping and initial FP Branch Analysis.
- Two new Mips SDNode to handle fp branch and compare instructions : FPBrcond,
  FPCmp
- MipsTargetLowering : handling different FP classes, Allegrex support, sret
  return copy, no homing location within EABI, non 32-bit stack objects
  arguments, and asm constraint for float.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53146 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/MipsISelLowering.h

@@ -40,6 +40,12 @@ namespace llvm {
       // Select CC Pseudo Instruction
       SelectCC,
 
+      // Float Point Branch Conditional
+      FPBrcond,
+
+      // Float Point Compare
+      FPCmp,
+
       // Return 
       Ret
     };
@@ -69,6 +75,9 @@ namespace llvm {
     MVT getSetCCResultType(const SDOperand &) const;
 
   private:
+    // Subtarget Info
+    const MipsSubtarget *Subtarget;
+
     // Lower Operand helpers
     SDOperand LowerCCCArguments(SDOperand Op, SelectionDAG &DAG);
     SDOperand LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG, unsigned CC);