Subzero, MIPS32: Stacksave/Stackrestore implementation

src/IceTargetLoweringMIPS32.cpp

 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// \brief Implements the TargetLoweringMIPS32 class, which consists almost
@@ skipping 4410 matching lines @@
       if (DestTy == IceType_f32) {
         _sqrt_s(T, legalizeToReg(Instr->getArg(0)));
       } else {
         _sqrt_d(T, legalizeToReg(Instr->getArg(0)));
       }
       _mov(Dest, T);
     }
     return;
   }
   case Intrinsics::Stacksave: {
-    UnimplementedLoweringError(this, Instr);
+    Variable *SP = getPhysicalRegister(RegMIPS32::Reg_SP);
+    _mov(Dest, SP);
     return;
   }
   case Intrinsics::Stackrestore: {
-    UnimplementedLoweringError(this, Instr);
+    if (getFlags().getUseSandboxing()) {
+      UnimplementedLoweringError(this, Instr);
+      return;
+    }
+    Variable *Val = legalizeToReg(Instr->getArg(0));
+    Variable *SP = getPhysicalRegister(RegMIPS32::Reg_SP);
+    _mov_redefined(SP, Val);
     return;
   }
   case Intrinsics::Trap: {
     const uint32_t TrapCodeZero = 0;
     _teq(getZero(), getZero(), TrapCodeZero);
     return;
   }
   case Intrinsics::LoadSubVector: {
     UnimplementedLoweringError(this, Instr); // Not required for PNaCl
     return;
@@ skipping 886 matching lines @@
   Str << "\t.set\t"
       << "noat\n";
 }
 
 SmallBitVector TargetMIPS32::TypeToRegisterSet[RCMIPS32_NUM];
 SmallBitVector TargetMIPS32::TypeToRegisterSetUnfiltered[RCMIPS32_NUM];
 SmallBitVector TargetMIPS32::RegisterAliases[RegMIPS32::Reg_NUM];
 
 } // end of namespace MIPS32
 } // end of namespace Ice