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/MipsTargetMachine.cpp

@@ -34,8 +34,7 @@ createTargetAsmInfo() const
 // On function prologue, the stack is created by decrementing
 // its pointer. Once decremented, all references are done with positive
 // offset from the stack/frame pointer, so StackGrowsUp is used.
-// When using CodeModel::Large the behaviour 
-//
+// Using CodeModel::Large enables different CALL behavior.
 MipsTargetMachine::
 MipsTargetMachine(const Module &M, const std::string &FS, bool isLittle=false):
   Subtarget(*this, M, FS, isLittle), 
@@ -59,22 +58,33 @@ MipselTargetMachine(const Module &M, const std::string &FS) :
 unsigned MipsTargetMachine::
 getModuleMatchQuality(const Module &M) 
 {
-  // We strongly match "mips-*".
+  // We strongly match "mips*-*".
   std::string TT = M.getTargetTriple();
   if (TT.size() >= 5 && std::string(TT.begin(), TT.begin()+5) == "mips-")
     return 20;
   
+  if (TT.size() >= 13 && std::string(TT.begin(), 
+      TT.begin()+13) == "mipsallegrex-")
+    return 20;
+
   return 0;
 }
 
-// return 0 and must specify -march to gen MIPSel code.
+// return 0 and must specify -march to gen MIPSEL code.
 unsigned MipselTargetMachine::
 getModuleMatchQuality(const Module &M) 
 {
-  // We strongly match "mipsel-*".
+  // We strongly match "mips*el-*".
   std::string TT = M.getTargetTriple();
   if (TT.size() >= 7 && std::string(TT.begin(), TT.begin()+7) == "mipsel-")
     return 20;
+
+  if (TT.size() >= 15 && std::string(TT.begin(), 
+      TT.begin()+15) == "mipsallegrexel-")
+    return 20;
+
+  if (TT.size() == 3 && std::string(TT.begin(), TT.begin()+3) == "psp")
+    return 20;
   
   return 0;
 }