diff --git a/src/compiler/CompilerIR.h b/src/compiler/CompilerIR.h
index 453ccdf..69689f9 100644
--- a/src/compiler/CompilerIR.h
+++ b/src/compiler/CompilerIR.h
@@ -196,9 +196,10 @@
   kMirOpFusedCmpgDouble,
   kMirOpFusedCmpLong,
   kMirOpNop,
-  kMirOpNullNRangeUpCheck,
-  kMirOpNullNRangeDownCheck,
-  kMirOpLowerBound,
+  kMirOpNullCheck,
+  kMirOpRangeCheck,
+  kMirOpDivZeroCheck,
+  kMirOpCheck,
   kMirOpLast,
 };
 
@@ -245,12 +246,10 @@
   int optimizationFlags;
   int seqNum;
   union {
-    // Used by the inlined insn from the callee to find the mother method
-    const Method* calleeMethod;
-    // Used by the inlined invoke to find the class and method pointers
-    CallsiteInfo* callsiteInfo;
     // Used to quickly locate all Phi opcodes
     MIR* phiNext;
+    // Establish link between two halves of throwing instructions
+    MIR* throwInsn;
   } meta;
 };
 
@@ -278,7 +277,6 @@
   uint16_t nestingDepth;
   const Method* containingMethod;     // For blocks from the callee
   BBType blockType;
-  bool needFallThroughBranch;         // For blocks ended due to length limit
   bool isFallThroughFromInvoke;       // True means the block needs alignment
   MIR* firstMIRInsn;
   MIR* lastMIRInsn;