Subzero, MIPS32: Stacksave/Stackrestore implementation

src/IceTargetLoweringMIPS32.cpp

Index: src/IceTargetLoweringMIPS32.cpp
diff --git a/src/IceTargetLoweringMIPS32.cpp b/src/IceTargetLoweringMIPS32.cpp
index cca3962750704964c7742990968db0570a809dbf..a15241f76d31c649eb8113605d148325d177f279 100644
--- a/src/IceTargetLoweringMIPS32.cpp
+++ b/src/IceTargetLoweringMIPS32.cpp
@@ -4428,11 +4428,18 @@ void TargetMIPS32::lowerIntrinsicCall(const InstIntrinsicCall *Instr) {
     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: {