diff --git a/src/compiler/codegen/MethodCodegenDriver.cc b/src/compiler/codegen/MethodCodegenDriver.cc
index d49b329..3c5fb23 100644
--- a/src/compiler/codegen/MethodCodegenDriver.cc
+++ b/src/compiler/codegen/MethodCodegenDriver.cc
@@ -819,9 +819,10 @@
   "kMirFusedCmpgDouble",
   "kMirFusedCmpLong",
   "kMirNop",
-  "kMirOpNullNRangeUpCheck",
-  "kMirOpNullNRangeDownCheck",
-  "kMirOpLowerBound",
+  "kMirOpNullCheck",
+  "kMirOpRangeCheck",
+  "kMirOpDivZeroCheck",
+  "kMirOpCheck",
 };
 
 /* Extended MIR instructions like PHI */
@@ -958,7 +959,17 @@
       newLIR1(cUnit, kPseudoSSARep, (int) ssaString);
     }
 
-    if ((int)mir->dalvikInsn.opcode >= (int)kMirOpFirst) {
+    if ((int)dalvikOpcode == (int)kMirOpCheck) {
+      // Combine check and work halves of throwing instruction.
+      MIR* workHalf = mir->meta.throwInsn;
+      mir->dalvikInsn.opcode = workHalf->dalvikInsn.opcode;
+      SSARepresentation* ssaRep = workHalf->ssaRep;
+      workHalf->ssaRep = mir->ssaRep;
+      mir->ssaRep = ssaRep;
+      workHalf->dalvikInsn.opcode = static_cast<Instruction::Code>(kMirOpNop);
+    }
+
+    if ((int)dalvikOpcode >= (int)kMirOpFirst) {
       handleExtendedMethodMIR(cUnit, bb, mir);
       continue;
     }