Subzero: Make the register allocator more robust with -reg-use and -reg-exclude.

src/IceTargetLoweringMIPS32.h

 //===- subzero/src/IceTargetLoweringMIPS32.h - MIPS32 lowering ---*- C++-*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 39 matching lines @@
   Variable *getPhysicalRegister(SizeT RegNum, Type Ty = IceType_void) override;
   IceString getRegName(SizeT RegNum, Type Ty) const override;
   llvm::SmallBitVector getRegisterSet(RegSetMask Include,
                                       RegSetMask Exclude) const override;
   const llvm::SmallBitVector &
   getRegistersForVariable(const Variable *Var) const override {
     RegClass RC = Var->getRegClass();
     assert(RC < RC_Target);
     return TypeToRegisterSet[RC];
   }
+  const llvm::SmallBitVector &
+  getAllRegistersForVariable(const Variable *Var) const override {
+    RegClass RC = Var->getRegClass();
+    assert(RC < RC_Target);
+    return TypeToRegisterSetUnfiltered[RC];
+  }
   const llvm::SmallBitVector &getAliasesForRegister(SizeT Reg) const override {
     return RegisterAliases[Reg];
   }
   bool hasFramePointer() const override { return UsesFramePointer; }
   void setHasFramePointer() override { UsesFramePointer = true; }
   SizeT getStackReg() const override { return RegMIPS32::Reg_SP; }
   SizeT getFrameReg() const override { return RegMIPS32::Reg_FP; }
   SizeT getFrameOrStackReg() const override {
     return UsesFramePointer ? getFrameReg() : getStackReg();
   }
@@ skipping 186 matching lines @@
   void randomlyInsertNop(float Probability,
                          RandomNumberGenerator &RNG) override;
   void
   makeRandomRegisterPermutation(llvm::SmallVectorImpl<int32_t> &Permutation,
                                 const llvm::SmallBitVector &ExcludeRegisters,
                                 uint64_t Salt) const override;
 
   bool UsesFramePointer = false;
   bool NeedsStackAlignment = false;
   static llvm::SmallBitVector TypeToRegisterSet[RCMIPS32_NUM];
+  static llvm::SmallBitVector TypeToRegisterSetUnfiltered[RCMIPS32_NUM];
   static llvm::SmallBitVector RegisterAliases[RegMIPS32::Reg_NUM];
   llvm::SmallBitVector RegsUsed;
   VarList PhysicalRegisters[IceType_NUM];
 
 private:
   ENABLE_MAKE_UNIQUE;
 };
 
 class TargetDataMIPS32 final : public TargetDataLowering {
   TargetDataMIPS32() = delete;
@@ skipping 34 matching lines @@
   explicit TargetHeaderMIPS32(GlobalContext *Ctx);
 
 private:
   ~TargetHeaderMIPS32() = default;
 };
 
 } // end of namespace MIPS32
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGMIPS32_H