diff --git a/src/compiler/CompilerIR.h b/src/compiler/CompilerIR.h
index 3f855bb..4327fb6 100644
--- a/src/compiler/CompilerIR.h
+++ b/src/compiler/CompilerIR.h
@@ -158,42 +158,6 @@
 #define NEXT_LIR(lir) (lir->next)
 #define PREV_LIR(lir) (lir->prev)
 
-/* Defines for aliasInfo (tracks Dalvik register references) */
-#define DECODE_ALIAS_INFO_REG(X)        (X & 0xffff)
-#define DECODE_ALIAS_INFO_WIDE_FLAG     (0x80000000)
-#define DECODE_ALIAS_INFO_WIDE(X)       ((X & DECODE_ALIAS_INFO_WIDE_FLAG) ? 1 : 0)
-#define ENCODE_ALIAS_INFO(REG, ISWIDE)  (REG | (ISWIDE ? DECODE_ALIAS_INFO_WIDE_FLAG : 0))
-
-/*
- * Def/Use encoding in 64-bit useMask/defMask.  Low positions used for target-specific
- * registers (and typically use the register number as the position).  High positions
- * reserved for common and abstract resources.
- */
-
-enum ResourceEncodingPos {
-  kMustNotAlias = 63,
-  kHeapRef = 62,          // Default memory reference type
-  kLiteral = 61,          // Literal pool memory reference
-  kDalvikReg = 60,        // Dalvik vReg memory reference
-  kFPStatus = 59,
-  kCCode = 58,
-  kLowestCommonResource = kCCode
-};
-
-/* Common resource macros */
-#define ENCODE_CCODE            (1ULL << kCCode)
-#define ENCODE_FP_STATUS        (1ULL << kFPStatus)
-
-/* Abstract memory locations */
-#define ENCODE_DALVIK_REG       (1ULL << kDalvikReg)
-#define ENCODE_LITERAL          (1ULL << kLiteral)
-#define ENCODE_HEAP_REF         (1ULL << kHeapRef)
-#define ENCODE_MUST_NOT_ALIAS   (1ULL << kMustNotAlias)
-
-#define ENCODE_ALL              (~0ULL)
-#define ENCODE_MEM              (ENCODE_DALVIK_REG | ENCODE_LITERAL | \
-                                 ENCODE_HEAP_REF | ENCODE_MUST_NOT_ALIAS)
-
 struct LIR {
   int offset;                        // Offset of this instruction
   int dalvikOffset;                  // Offset of Dalvik opcode
diff --git a/src/compiler/codegen/CodegenUtil.cc b/src/compiler/codegen/CodegenUtil.cc
index 3041d0b..7ad2647 100644
--- a/src/compiler/codegen/CodegenUtil.cc
+++ b/src/compiler/codegen/CodegenUtil.cc
@@ -65,7 +65,36 @@
    * Store the Dalvik register id in aliasInfo. Mark the MSB if it is a 64-bit
    * access.
    */
-  lir->aliasInfo = ENCODE_ALIAS_INFO(regId, is64bit);
+  lir->aliasInfo = regId;
+  if (is64bit) {
+    lir->aliasInfo |= 0x80000000;
+  }
+}
+
+/*
+ * Decode the register id.
+ */
+inline u8 getRegMaskCommon(CompilationUnit* cUnit, int reg)
+{
+  u8 seed;
+  int shift;
+  int regId;
+
+
+  if (cUnit->instructionSet == kX86) {
+    regId = reg & 0xf;
+    /* Double registers in x86 are just a single FP register */
+    seed = 1;
+  } else {
+    regId = reg & 0x1f;
+  /* Each double register is equal to a pair of single-precision FP registers */
+    seed = DOUBLEREG(reg) ? 3 : 1;
+  }
+  /* FP register starts at bit position 16 */
+  shift = FPREG(reg) ? kFPReg0 : 0;
+  /* Expand the double register id into single offset */
+  shift += regId;
+  return (seed << shift);
 }
 
 u8 oatGetRegMaskCommon(CompilationUnit* cUnit, int reg)
@@ -132,6 +161,10 @@
     setupRegMask(cUnit, &lir->defMask, lir->operands[1]);
   }
 
+  if (flags & REG_DEF_SP) {
+    lir->defMask |= ENCODE_REG_SP;
+  }
+
 
   if (flags & SETS_CCODES) {
     lir->defMask |= ENCODE_CCODE;
@@ -147,6 +180,10 @@
     }
   }
 
+  if (flags & REG_USE_SP) {
+    lir->useMask |= ENCODE_REG_SP;
+  }
+
   if (flags & USES_CCODES) {
     lir->useMask |= ENCODE_CCODE;
   }
diff --git a/src/compiler/codegen/CompilerCodegen.h b/src/compiler/codegen/CompilerCodegen.h
index 7584d2b..d349412 100644
--- a/src/compiler/codegen/CompilerCodegen.h
+++ b/src/compiler/codegen/CompilerCodegen.h
@@ -21,112 +21,6 @@
 
 namespace art {
 
-
-// Set to 1 to measure cost of suspend check
-#define NO_SUSPEND 0
-
-/* Bit flags describing the behavior of native opcodes (Arm/Mips/x86 combined) */
-enum OpFeatureFlags {
-  kIsBranch = 0,
-  kNoOperand,
-  kIsUnaryOp,
-  kIsBinaryOp,
-  kIsTertiaryOp,
-  kIsQuadOp,
-  kIsQuinOp,
-  kIsSextupleOp,
-  kIsIT,
-  kMemLoad,
-  kMemStore,
-  kPCRelFixup, // x86 FIXME: add NEEDS_FIXUP to instruction attributes
-  kRegDef0,
-  kRegDef1,
-  kRegDefA,
-  kRegDefD,
-  kRegDefFPCSList0,
-  kRegDefFPCSList2,
-  kRegDefList0,
-  kRegDefList1,
-  kRegDefList2,
-  kRegDefLR,
-  kRegDefSP,
-  kRegUse0,
-  kRegUse1,
-  kRegUse2,
-  kRegUse3,
-  kRegUse4,
-  kRegUseA,
-  kRegUseC,
-  kRegUseD,
-  kRegUseFPCSList0,
-  kRegUseFPCSList2,
-  kRegUseList0,
-  kRegUseList1,
-  kRegUseLR,
-  kRegUsePC,
-  kRegUseSP,
-  kSetsCCodes,
-  kUsesCCodes
-};
-
-#define IS_BINARY_OP         (1ULL << kIsBinaryOp)
-#define IS_BRANCH            (1ULL << kIsBranch)
-#define IS_IT                (1ULL << kIsIT)
-#define IS_LOAD              (1ULL << kMemLoad)
-#define IS_QUAD_OP           (1ULL << kIsQuadOp)
-#define IS_QUIN_OP           (1ULL << kIsQuinOp)
-#define IS_SEXTUPLE_OP       (1ULL << kIsSextupleOp)
-#define IS_STORE             (1ULL << kMemStore)
-#define IS_TERTIARY_OP       (1ULL << kIsTertiaryOp)
-#define IS_UNARY_OP          (1ULL << kIsUnaryOp)
-#define NEEDS_FIXUP          (1ULL << kPCRelFixup)
-#define NO_OPERAND           (1ULL << kNoOperand)
-#define REG_DEF0             (1ULL << kRegDef0)
-#define REG_DEF1             (1ULL << kRegDef1)
-#define REG_DEFA             (1ULL << kRegDefA)
-#define REG_DEFD             (1ULL << kRegDefD)
-#define REG_DEF_FPCS_LIST0   (1ULL << kRegDefFPCSList0)
-#define REG_DEF_FPCS_LIST2   (1ULL << kRegDefFPCSList2)
-#define REG_DEF_LIST0        (1ULL << kRegDefList0)
-#define REG_DEF_LIST1        (1ULL << kRegDefList1)
-#define REG_DEF_LR           (1ULL << kRegDefLR)
-#define REG_DEF_SP           (1ULL << kRegDefSP)
-#define REG_USE0             (1ULL << kRegUse0)
-#define REG_USE1             (1ULL << kRegUse1)
-#define REG_USE2             (1ULL << kRegUse2)
-#define REG_USE3             (1ULL << kRegUse3)
-#define REG_USE4             (1ULL << kRegUse4)
-#define REG_USEA             (1ULL << kRegUseA)
-#define REG_USEC             (1ULL << kRegUseC)
-#define REG_USED             (1ULL << kRegUseD)
-#define REG_USE_FPCS_LIST0   (1ULL << kRegUseFPCSList0)
-#define REG_USE_FPCS_LIST2   (1ULL << kRegUseFPCSList2)
-#define REG_USE_LIST0        (1ULL << kRegUseList0)
-#define REG_USE_LIST1        (1ULL << kRegUseList1)
-#define REG_USE_LR           (1ULL << kRegUseLR)
-#define REG_USE_PC           (1ULL << kRegUsePC)
-#define REG_USE_SP           (1ULL << kRegUseSP)
-#define SETS_CCODES          (1ULL << kSetsCCodes)
-#define USES_CCODES          (1ULL << kUsesCCodes)
-
-/* Common combo register usage patterns */
-#define REG_DEF01            (REG_DEF0 | REG_DEF1)
-#define REG_DEF01_USE2       (REG_DEF0 | REG_DEF1 | REG_USE2)
-#define REG_DEF0_USE01       (REG_DEF0 | REG_USE01)
-#define REG_DEF0_USE0        (REG_DEF0 | REG_USE0)
-#define REG_DEF0_USE12       (REG_DEF0 | REG_USE12)
-#define REG_DEF0_USE1        (REG_DEF0 | REG_USE1)
-#define REG_DEF0_USE2        (REG_DEF0 | REG_USE2)
-#define REG_DEFAD_USEAD      (REG_DEFAD_USEA | REG_USED)
-#define REG_DEFAD_USEA       (REG_DEFA_USEA | REG_DEFD)
-#define REG_DEFA_USEA        (REG_DEFA | REG_USEA)
-#define REG_USE012           (REG_USE01 | REG_USE2)
-#define REG_USE014           (REG_USE01 | REG_USE4)
-#define REG_USE01            (REG_USE0 | REG_USE1)
-#define REG_USE02            (REG_USE0 | REG_USE2)
-#define REG_USE12            (REG_USE1 | REG_USE2)
-#define REG_USE23            (REG_USE2 | REG_USE3)
-
 LIR* rawLIR(CompilationUnit* cUnit, int dalvikOffset, int opcode, int op0 = 0,
             int op1 = 0, int op2 = 0, int op3 = 0, int op4 = 0,
             LIR* target = NULL);
@@ -220,8 +114,6 @@
 LIR* opTestSuspend(CompilationUnit* cUnit, LIR* target);
 LIR* opDecAndBranch(CompilationUnit* cUnit, ConditionCode cCode, int reg, LIR* target);
 LIR* opIT(CompilationUnit* cUnit, ArmConditionCode cond, const char* guide);
-uint64_t getPCUseDefEncoding();
-uint64_t getRegMaskCommon(CompilationUnit* cUnit, int reg);
 
 }  // namespace art
 
diff --git a/src/compiler/codegen/LocalOptimizations.cc b/src/compiler/codegen/LocalOptimizations.cc
index 356f4f9..c0e6036 100644
--- a/src/compiler/codegen/LocalOptimizations.cc
+++ b/src/compiler/codegen/LocalOptimizations.cc
@@ -121,7 +121,7 @@
        * region bits since stopMask is used to check data/control
        * dependencies.
        */
-        stopUseRegMask = (getPCUseDefEncoding() | thisLIR->useMask) & ~ENCODE_MEM;
+        stopUseRegMask = (ENCODE_REG_PC | thisLIR->useMask) & ~ENCODE_MEM;
     }
 
     for (checkLIR = NEXT_LIR(thisLIR);
@@ -298,7 +298,7 @@
        * conservatively here.
        */
       if (stopUseAllMask & ENCODE_HEAP_REF) {
-        stopUseAllMask |= getPCUseDefEncoding();
+        stopUseAllMask |= ENCODE_REG_PC;
       }
     }
 
diff --git a/src/compiler/codegen/arm/ArchUtility.cc b/src/compiler/codegen/arm/ArchUtility.cc
index 8746b68..820f64e 100644
--- a/src/compiler/codegen/arm/ArchUtility.cc
+++ b/src/compiler/codegen/arm/ArchUtility.cc
@@ -22,57 +22,24 @@
 
 namespace art {
 
-/*
- * Decode the register id.
- */
-u8 getRegMaskCommon(CompilationUnit* cUnit, int reg)
-{
-  u8 seed;
-  int shift;
-  int regId;
-
-
-  regId = reg & 0x1f;
-  /* Each double register is equal to a pair of single-precision FP registers */
-  seed = DOUBLEREG(reg) ? 3 : 1;
-  /* FP register starts at bit position 16 */
-  shift = FPREG(reg) ? kArmFPReg0 : 0;
-  /* Expand the double register id into single offset */
-  shift += regId;
-  return (seed << shift);
-}
-
-uint64_t getPCUseDefEncoding()
-{
-  return ENCODE_ARM_REG_PC;
-}
-
 void setupTargetResourceMasks(CompilationUnit* cUnit, LIR* lir)
 {
   DCHECK_EQ(cUnit->instructionSet, kThumb2);
 
   // Thumb2 specific setup
-  uint64_t flags = EncodingMap[lir->opcode].flags;
+  int flags = EncodingMap[lir->opcode].flags;
   int opcode = lir->opcode;
 
-  if (flags & REG_DEF_SP) {
-    lir->defMask |= ENCODE_ARM_REG_SP;
-  }
-
-  if (flags & REG_USE_SP) {
-    lir->useMask |= ENCODE_ARM_REG_SP;
-  }
-
   if (flags & REG_DEF_LIST0) {
-    lir->defMask |= ENCODE_ARM_REG_LIST(lir->operands[0]);
+    lir->defMask |= ENCODE_REG_LIST(lir->operands[0]);
   }
 
   if (flags & REG_DEF_LIST1) {
-    lir->defMask |= ENCODE_ARM_REG_LIST(lir->operands[1]);
+    lir->defMask |= ENCODE_REG_LIST(lir->operands[1]);
   }
 
   if (flags & REG_DEF_FPCS_LIST0) {
-    lir->defMask |= ENCODE_ARM_REG_FPCS_LIST(lir->operands[0]);
+    lir->defMask |= ENCODE_REG_FPCS_LIST(lir->operands[0]);
   }
 
   if (flags & REG_DEF_FPCS_LIST2) {
@@ -82,7 +49,7 @@
   }
 
   if (flags & REG_USE_PC) {
-    lir->useMask |= ENCODE_ARM_REG_PC;
+    lir->useMask |= ENCODE_REG_PC;
   }
 
   /* Conservatively treat the IT block */
@@ -91,15 +58,15 @@
   }
 
   if (flags & REG_USE_LIST0) {
-    lir->useMask |= ENCODE_ARM_REG_LIST(lir->operands[0]);
+    lir->useMask |= ENCODE_REG_LIST(lir->operands[0]);
   }
 
   if (flags & REG_USE_LIST1) {
-    lir->useMask |= ENCODE_ARM_REG_LIST(lir->operands[1]);
+    lir->useMask |= ENCODE_REG_LIST(lir->operands[1]);
   }
 
   if (flags & REG_USE_FPCS_LIST0) {
-    lir->useMask |= ENCODE_ARM_REG_FPCS_LIST(lir->operands[0]);
+    lir->useMask |= ENCODE_REG_FPCS_LIST(lir->operands[0]);
   }
 
   if (flags & REG_USE_FPCS_LIST2) {
@@ -112,14 +79,14 @@
     u8 r8Mask = oatGetRegMaskCommon(cUnit, r8);
     if ((opcode == kThumbPush) && (lir->useMask & r8Mask)) {
       lir->useMask &= ~r8Mask;
-      lir->useMask |= ENCODE_ARM_REG_LR;
+      lir->useMask |= ENCODE_REG_LR;
     } else if ((opcode == kThumbPop) && (lir->defMask & r8Mask)) {
       lir->defMask &= ~r8Mask;
-      lir->defMask |= ENCODE_ARM_REG_PC;
+      lir->defMask |= ENCODE_REG_PC;
     }
   }
   if (flags & REG_DEF_LR) {
-    lir->defMask |= ENCODE_ARM_REG_LR;
+    lir->defMask |= ENCODE_REG_LR;
   }
 }
 
@@ -387,7 +354,7 @@
     char num[8];
     int i;
 
-    for (i = 0; i < kArmRegEnd; i++) {
+    for (i = 0; i < kRegEnd; i++) {
       if (mask & (1ULL << i)) {
         sprintf(num, "%d ", i);
         strcat(buf, num);
diff --git a/src/compiler/codegen/arm/ArmLIR.h b/src/compiler/codegen/arm/ArmLIR.h
index 05082ed..407ad79 100644
--- a/src/compiler/codegen/arm/ArmLIR.h
+++ b/src/compiler/codegen/arm/ArmLIR.h
@@ -22,6 +22,9 @@
 
 namespace art {
 
+// Set to 1 to measure cost of suspend check
+#define NO_SUSPEND 0
+
 /*
  * Runtime register usage conventions.
  *
@@ -129,21 +132,43 @@
 #define LOC_C_RETURN_FLOAT  LOC_C_RETURN
 #define LOC_C_RETURN_WIDE_DOUBLE  LOC_C_RETURN_WIDE
 
-enum ArmResourceEncodingPos {
-  kArmGPReg0   = 0,
-  kArmRegSP    = 13,
-  kArmRegLR    = 14,
-  kArmRegPC    = 15,
-  kArmFPReg0   = 16,
-  kArmFPReg16  = 32,
-  kArmRegEnd   = 48,
+enum ResourceEncodingPos {
+  kGPReg0   = 0,
+  kRegSP    = 13,
+  kRegLR    = 14,
+  kRegPC    = 15,
+  kFPReg0   = 16,
+  kFPReg16  = 32,
+  kRegEnd   = 48,
+  kCCode    = kRegEnd,
+  kFPStatus,      // FP status word
+  // The following four bits are for memory disambiguation
+  kDalvikReg,     // 1 Dalvik Frame (can be fully disambiguated)
+  kLiteral,       // 2 Literal pool (can be fully disambiguated)
+  kHeapRef,       // 3 Somewhere on the heap (alias with any other heap)
+  kMustNotAlias,    // 4 Guaranteed to be non-alias (eg *(r6+x))
 };
 
-#define ENCODE_ARM_REG_LIST(N)      ((u8) N)
-#define ENCODE_ARM_REG_SP           (1ULL << kArmRegSP)
-#define ENCODE_ARM_REG_LR           (1ULL << kArmRegLR)
-#define ENCODE_ARM_REG_PC           (1ULL << kArmRegPC)
-#define ENCODE_ARM_REG_FPCS_LIST(N) ((u8)N << kArmFPReg16)
+#define ENCODE_REG_LIST(N)      ((u8) N)
+#define ENCODE_REG_SP           (1ULL << kRegSP)
+#define ENCODE_REG_LR           (1ULL << kRegLR)
+#define ENCODE_REG_PC           (1ULL << kRegPC)
+#define ENCODE_CCODE            (1ULL << kCCode)
+#define ENCODE_FP_STATUS        (1ULL << kFPStatus)
+#define ENCODE_REG_FPCS_LIST(N) ((u8)N << kFPReg16)
+
+/* Abstract memory locations */
+#define ENCODE_DALVIK_REG       (1ULL << kDalvikReg)
+#define ENCODE_LITERAL          (1ULL << kLiteral)
+#define ENCODE_HEAP_REF         (1ULL << kHeapRef)
+#define ENCODE_MUST_NOT_ALIAS   (1ULL << kMustNotAlias)
+
+#define ENCODE_ALL              (~0ULL)
+#define ENCODE_MEM              (ENCODE_DALVIK_REG | ENCODE_LITERAL | \
+                 ENCODE_HEAP_REF | ENCODE_MUST_NOT_ALIAS)
+
+#define DECODE_ALIAS_INFO_REG(X)        (X & 0xffff)
+#define DECODE_ALIAS_INFO_WIDE(X)       ((X & 0x80000000) ? 1 : 0)
 
 /*
  * Annotate special-purpose core registers:
@@ -581,6 +606,82 @@
 };
 
 /* Bit flags describing the behavior of each native opcode */
+enum ArmOpFeatureFlags {
+  kIsBranch = 0,
+  kRegDef0,
+  kRegDef1,
+  kRegDefSP,
+  kRegDefLR,
+  kRegDefList0,
+  kRegDefList1,
+  kRegDefFPCSList0,
+  kRegDefFPCSList2,
+  kRegDefList2,
+  kRegUse0,
+  kRegUse1,
+  kRegUse2,
+  kRegUse3,
+  kRegUseSP,
+  kRegUsePC,
+  kRegUseList0,
+  kRegUseList1,
+  kRegUseFPCSList0,
+  kRegUseFPCSList2,
+  kNoOperand,
+  kIsUnaryOp,
+  kIsBinaryOp,
+  kIsTertiaryOp,
+  kIsQuadOp,
+  kIsIT,
+  kSetsCCodes,
+  kUsesCCodes,
+  kMemLoad,
+  kMemStore,
+  kPCRelFixup,
+};
+
+#define IS_LOAD         (1 << kMemLoad)
+#define IS_STORE        (1 << kMemStore)
+#define IS_BRANCH       (1 << kIsBranch)
+#define REG_DEF0        (1 << kRegDef0)
+#define REG_DEF1        (1 << kRegDef1)
+#define REG_DEF_SP      (1 << kRegDefSP)
+#define REG_DEF_LR      (1 << kRegDefLR)
+#define REG_DEF_LIST0   (1 << kRegDefList0)
+#define REG_DEF_LIST1   (1 << kRegDefList1)
+#define REG_DEF_FPCS_LIST0   (1 << kRegDefFPCSList0)
+#define REG_DEF_FPCS_LIST2   (1 << kRegDefFPCSList2)
+#define REG_USE0        (1 << kRegUse0)
+#define REG_USE1        (1 << kRegUse1)
+#define REG_USE2        (1 << kRegUse2)
+#define REG_USE3        (1 << kRegUse3)
+#define REG_USE_SP      (1 << kRegUseSP)
+#define REG_USE_PC      (1 << kRegUsePC)
+#define REG_USE_LIST0   (1 << kRegUseList0)
+#define REG_USE_LIST1   (1 << kRegUseList1)
+#define REG_USE_FPCS_LIST0   (1 << kRegUseFPCSList0)
+#define REG_USE_FPCS_LIST2   (1 << kRegUseFPCSList2)
+#define NO_OPERAND      (1 << kNoOperand)
+#define IS_UNARY_OP     (1 << kIsUnaryOp)
+#define IS_BINARY_OP    (1 << kIsBinaryOp)
+#define IS_TERTIARY_OP  (1 << kIsTertiaryOp)
+#define IS_QUAD_OP      (1 << kIsQuadOp)
+#define IS_QUIN_OP      0
+#define IS_IT           (1 << kIsIT)
+#define SETS_CCODES     (1 << kSetsCCodes)
+#define USES_CCODES     (1 << kUsesCCodes)
+#define NEEDS_FIXUP     (1 << kPCRelFixup)
+
+/* Common combo register usage patterns */
+#define REG_USE01       (REG_USE0 | REG_USE1)
+#define REG_USE012      (REG_USE01 | REG_USE2)
+#define REG_USE12       (REG_USE1 | REG_USE2)
+#define REG_DEF0_USE0   (REG_DEF0 | REG_USE0)
+#define REG_DEF0_USE1   (REG_DEF0 | REG_USE1)
+#define REG_DEF0_USE01  (REG_DEF0 | REG_USE01)
+#define REG_DEF0_USE12  (REG_DEF0 | REG_USE12)
+#define REG_DEF01_USE2  (REG_DEF0 | REG_DEF1 | REG_USE2)
+
 /* Instruction assembly fieldLoc kind */
 enum ArmEncodingKind {
   kFmtUnused,
@@ -609,7 +710,7 @@
     int start; /* start for kFmtBitBlt, 4-bit slice end for FP regs */
   } fieldLoc[4];
   ArmOpcode opcode;
-  uint64_t flags;
+  int flags;
   const char* name;
   const char* fmt;
   int size;   /* Size in bytes */
diff --git a/src/compiler/codegen/mips/ArchUtility.cc b/src/compiler/codegen/mips/ArchUtility.cc
index 9a2b923..f837c39 100644
--- a/src/compiler/codegen/mips/ArchUtility.cc
+++ b/src/compiler/codegen/mips/ArchUtility.cc
@@ -22,49 +22,14 @@
 
 namespace art {
 
-/*
- * Decode the register id.
- */
-u8 getRegMaskCommon(CompilationUnit* cUnit, int reg)
-{
-  u8 seed;
-  int shift;
-  int regId;
-
-
-  regId = reg & 0x1f;
-  /* Each double register is equal to a pair of single-precision FP registers */
-  seed = DOUBLEREG(reg) ? 3 : 1;
-  /* FP register starts at bit position 16 */
-  shift = FPREG(reg) ? kMipsFPReg0 : 0;
-  /* Expand the double register id into single offset */
-  shift += regId;
-  return (seed << shift);
-}
-
-uint64_t getPCUseDefEncoding()
-{
-  return ENCODE_MIPS_REG_PC;
-}
-
-
 void setupTargetResourceMasks(CompilationUnit* cUnit, LIR* lir)
 {
   DCHECK_EQ(cUnit->instructionSet, kMips);
 
   // Mips-specific resource map setup here.
-  uint64_t flags = EncodingMap[lir->opcode].flags;
-
-  if (flags & REG_DEF_SP) {
-    lir->defMask |= ENCODE_MIPS_REG_SP;
-  }
-
-  if (flags & REG_USE_SP) {
-    lir->useMask |= ENCODE_MIPS_REG_SP;
-  }
-
+  int flags = EncodingMap[lir->opcode].flags;
   if (flags & REG_DEF_LR) {
-    lir->defMask |= ENCODE_MIPS_REG_LR;
+    lir->defMask |= ENCODE_REG_LR;
   }
 }
 
@@ -186,7 +151,7 @@
     char num[8];
     int i;
 
-    for (i = 0; i < kMipsRegEnd; i++) {
+    for (i = 0; i < kRegEnd; i++) {
       if (mask & (1ULL << i)) {
         sprintf(num, "%d ", i);
         strcat(buf, num);
diff --git a/src/compiler/codegen/mips/MipsLIR.h b/src/compiler/codegen/mips/MipsLIR.h
index b8e5801..a175706 100644
--- a/src/compiler/codegen/mips/MipsLIR.h
+++ b/src/compiler/codegen/mips/MipsLIR.h
@@ -22,6 +22,9 @@
 
 namespace art {
 
+// Set to 1 to measure cost of suspend check
+#define NO_SUSPEND 0
+
 /*
  * Runtime register conventions.
  *
@@ -156,22 +159,44 @@
 #define LOC_C_RETURN_WIDE_DOUBLE {kLocPhysReg, 1, 0, 0, 0, 0, 0, 0, 1, r_FRESULT0,\
                                   r_FRESULT1, INVALID_SREG, INVALID_SREG}
 
-enum MipsResourceEncodingPos {
-  kMipsGPReg0   = 0,
-  kMipsRegSP    = 29,
-  kMipsRegLR    = 31,
-  kMipsFPReg0   = 32, /* only 16 fp regs supported currently */
-  kMipsFPRegEnd   = 48,
-  kMipsRegHI    = kMipsFPRegEnd,
-  kMipsRegLO,
-  kMipsRegPC,
-  kMipsRegEnd   = 51,
+enum ResourceEncodingPos {
+  kGPReg0   = 0,
+  kRegSP    = 29,
+  kRegLR    = 31,
+  kFPReg0   = 32, /* only 16 fp regs supported currently */
+  kFPRegEnd   = 48,
+  kRegHI    = kFPRegEnd,
+  kRegLO,
+  kRegPC,
+  kRegEnd   = 51,
+  kCCode    = kRegEnd,
+  kFPStatus,      // FP status word
+  // The following four bits are for memory disambiguation
+  kDalvikReg,     // 1 Dalvik Frame (can be fully disambiguated)
+  kLiteral,       // 2 Literal pool (can be fully disambiguated)
+  kHeapRef,       // 3 Somewhere on the heap (alias with any other heap)
+  kMustNotAlias,    // 4 Guaranteed to be non-alias (eg *(r6+x))
 };
 
-#define ENCODE_MIPS_REG_LIST(N)      ((u8) N)
-#define ENCODE_MIPS_REG_SP           (1ULL << kMipsRegSP)
-#define ENCODE_MIPS_REG_LR           (1ULL << kMipsRegLR)
-#define ENCODE_MIPS_REG_PC           (1ULL << kMipsRegPC)
+#define ENCODE_REG_LIST(N)      ((u8) N)
+#define ENCODE_REG_SP           (1ULL << kRegSP)
+#define ENCODE_REG_LR           (1ULL << kRegLR)
+#define ENCODE_REG_PC           (1ULL << kRegPC)
+#define ENCODE_CCODE            (1ULL << kCCode)
+#define ENCODE_FP_STATUS        (1ULL << kFPStatus)
+
+/* Abstract memory locations */
+#define ENCODE_DALVIK_REG       (1ULL << kDalvikReg)
+#define ENCODE_LITERAL          (1ULL << kLiteral)
+#define ENCODE_HEAP_REF         (1ULL << kHeapRef)
+#define ENCODE_MUST_NOT_ALIAS   (1ULL << kMustNotAlias)
+
+#define ENCODE_ALL              (~0ULL)
+#define ENCODE_MEM              (ENCODE_DALVIK_REG | ENCODE_LITERAL | \
+                 ENCODE_HEAP_REF | ENCODE_MUST_NOT_ALIAS)
+
+#define DECODE_ALIAS_INFO_REG(X)        (X & 0xffff)
+#define DECODE_ALIAS_INFO_WIDE(X)       ((X & 0x80000000) ? 1 : 0)
 
 /*
  * Annotate special-purpose core registers:
@@ -413,6 +438,84 @@
 };
 
 /* Bit flags describing the behavior of each native opcode */
+enum MipsOpFeatureFlags {
+  kIsBranch = 0,
+  kRegDef0,
+  kRegDef1,
+  kRegDefSP,
+  kRegDefLR,
+  kRegDefList0,
+  kRegDefList1,
+  kRegUse0,
+  kRegUse1,
+  kRegUse2,
+  kRegUse3,
+  kRegUseSP,
+  kRegUsePC,
+  kRegUseList0,
+  kRegUseList1,
+  kNoOperand,
+  kIsUnaryOp,
+  kIsBinaryOp,
+  kIsTertiaryOp,
+  kIsQuadOp,
+  kIsIT,
+  kSetsCCodes,
+  kUsesCCodes,
+  kMemLoad,
+  kMemStore,
+  kPCRelFixup,
+  kRegUseLR,
+};
+
+#define IS_LOAD         (1 << kMemLoad)
+#define IS_STORE        (1 << kMemStore)
+#define IS_BRANCH       (1 << kIsBranch)
+#define REG_DEF0        (1 << kRegDef0)
+#define REG_DEF1        (1 << kRegDef1)
+#define REG_DEF_SP      (1 << kRegDefSP)
+#define REG_DEF_LR      (1 << kRegDefLR)
+#define REG_DEF_LIST0   (1 << kRegDefList0)
+#define REG_DEF_LIST1   (1 << kRegDefList1)
+#define REG_USE0        (1 << kRegUse0)
+#define REG_USE1        (1 << kRegUse1)
+#define REG_USE2        (1 << kRegUse2)
+#define REG_USE3        (1 << kRegUse3)
+#define REG_USE_SP      (1 << kRegUseSP)
+#define REG_USE_PC      (1 << kRegUsePC)
+#define REG_USE_LIST0   (1 << kRegUseList0)
+#define REG_USE_LIST1   (1 << kRegUseList1)
+#define NO_OPERAND      (1 << kNoOperand)
+#define IS_UNARY_OP     (1 << kIsUnaryOp)
+#define IS_BINARY_OP    (1 << kIsBinaryOp)
+#define IS_TERTIARY_OP  (1 << kIsTertiaryOp)
+#define IS_QUAD_OP      (1 << kIsQuadOp)
+#define IS_QUIN_OP      0
+#define IS_IT           (1 << kIsIT)
+#define SETS_CCODES     (1 << kSetsCCodes)
+#define USES_CCODES     (1 << kUsesCCodes)
+#define NEEDS_FIXUP     (1 << kPCRelFixup)
+#define REG_USE_LR      (1 << kRegUseLR)
+
+/*  attributes, included for compatibility */
+#define REG_DEF_FPCS_LIST0   (0)
+#define REG_DEF_FPCS_LIST2   (0)
+
+
+/* Common combo register usage patterns */
+#define REG_USE01       (REG_USE0 | REG_USE1)
+#define REG_USE02       (REG_USE0 | REG_USE2)
+#define REG_USE012      (REG_USE01 | REG_USE2)
+#define REG_USE12       (REG_USE1 | REG_USE2)
+#define REG_USE23       (REG_USE2 | REG_USE3)
+#define REG_DEF01       (REG_DEF0 | REG_DEF1)
+#define REG_DEF0_USE0   (REG_DEF0 | REG_USE0)
+#define REG_DEF0_USE1   (REG_DEF0 | REG_USE1)
+#define REG_DEF0_USE2   (REG_DEF0 | REG_USE2)
+#define REG_DEF0_USE01  (REG_DEF0 | REG_USE01)
+#define REG_DEF0_USE12  (REG_DEF0 | REG_USE12)
+#define REG_DEF01_USE2  (REG_DEF0 | REG_DEF1 | REG_USE2)
+
 /* Instruction assembly fieldLoc kind */
 enum MipsEncodingKind {
   kFmtUnused,
@@ -431,7 +534,7 @@
     int start; /* start for kFmtBitBlt, 4-bit slice end for FP regs */
   } fieldLoc[4];
   MipsOpCode opcode;
-  uint64_t flags;
+  int flags;
   const char *name;
   const char* fmt;
   int size;   /* Size in bytes */
diff --git a/src/compiler/codegen/x86/ArchUtility.cc b/src/compiler/codegen/x86/ArchUtility.cc
index 953ce4a..4c28b35 100644
--- a/src/compiler/codegen/x86/ArchUtility.cc
+++ b/src/compiler/codegen/x86/ArchUtility.cc
@@ -22,50 +22,12 @@
 
 namespace art {
 
-/*
- * Decode the register id.
- */
-u8 getRegMaskCommon(CompilationUnit* cUnit, int reg)
-{
-  u8 seed;
-  int shift;
-  int regId;
-
-  regId = reg & 0xf;
-  /* Double registers in x86 are just a single FP register */
-  seed = 1;
-  /* FP register starts at bit position 16 */
-  shift = FPREG(reg) ? kX86FPReg0 : 0;
-  /* Expand the double register id into single offset */
-  shift += regId;
-  return (seed << shift);
-}
-
-uint64_t getPCUseDefEncoding()
-{
-  /*
-   * FIXME: might make sense to use a virtual resource encoding bit for pc.  Might be
-   * able to clean up some of the x86/Arm_Mips differences
-   */
-  LOG(FATAL) << "Unexpected call to getPCUseDefEncoding for x86";
-  return 0ULL;
-}
-
 void setupTargetResourceMasks(CompilationUnit* cUnit, LIR* lir)
 {
   DCHECK_EQ(cUnit->instructionSet, kX86);
 
   // X86-specific resource map setup here.
-  uint64_t flags = EncodingMap[lir->opcode].flags;
-
-  if (flags & REG_USE_SP) {
-    lir->useMask |= ENCODE_X86_REG_SP;
-  }
-
-  if (flags & REG_DEF_SP) {
-    lir->defMask |= ENCODE_X86_REG_SP;
-  }
-
+  int flags = EncodingMap[lir->opcode].flags;
   if (flags & REG_DEFA) {
     oatSetupRegMask(cUnit, &lir->defMask, rAX);
   }
@@ -185,7 +147,7 @@
     char num[8];
     int i;
 
-    for (i = 0; i < kX86RegEnd; i++) {
+    for (i = 0; i < kRegEnd; i++) {
       if (mask & (1ULL << i)) {
         sprintf(num, "%d ", i);
         strcat(buf, num);
diff --git a/src/compiler/codegen/x86/Assemble.cc b/src/compiler/codegen/x86/Assemble.cc
index 71fcdc8..c47711c 100644
--- a/src/compiler/codegen/x86/Assemble.cc
+++ b/src/compiler/codegen/x86/Assemble.cc
@@ -352,7 +352,7 @@
   }
   if (displacement != 0) {
     if (entry->opcode != kX86Lea32RA) {
-      DCHECK_NE(entry->flags & (IS_LOAD | IS_STORE), 0ULL) << entry->name;
+      DCHECK_NE(entry->flags & (IS_LOAD | IS_STORE), 0) << entry->name;
     }
     size += IS_SIMM8(displacement) ? 1 : 4;
   }
diff --git a/src/compiler/codegen/x86/X86/Factory.cc b/src/compiler/codegen/x86/X86/Factory.cc
index 040ef17..3da7672 100644
--- a/src/compiler/codegen/x86/X86/Factory.cc
+++ b/src/compiler/codegen/x86/X86/Factory.cc
@@ -67,7 +67,7 @@
       opcode = kX86MovdrxRR;
     }
   }
-  DCHECK_NE((EncodingMap[opcode].flags & IS_BINARY_OP), 0ULL);
+  DCHECK_NE((EncodingMap[opcode].flags & IS_BINARY_OP), 0);
   LIR* res = rawLIR(cUnit, cUnit->currentDalvikOffset, opcode, rDest, rSrc);
   if (rDest == rSrc) {
     res->flags.isNop = true;
diff --git a/src/compiler/codegen/x86/X86LIR.h b/src/compiler/codegen/x86/X86LIR.h
index 59b1859..9a5d630 100644
--- a/src/compiler/codegen/x86/X86LIR.h
+++ b/src/compiler/codegen/x86/X86LIR.h
@@ -22,6 +22,9 @@
 
 namespace art {
 
+// Set to 1 to measure cost of suspend check
+#define NO_SUSPEND 0
+
 /*
  * Runtime register conventions. We consider both x86, x86-64 and x32 (32bit mode x86-64), although
  * we currently only target x86. The ABI has different conventions and we hope to have a single
@@ -140,16 +143,40 @@
 #define LOC_C_RETURN_FLOAT       {kLocPhysReg, 0,    0,       0,     1,  0,    0,   0,        1,    fr0,    INVALID_REG, INVALID_SREG, INVALID_SREG}
 #define LOC_C_RETURN_WIDE_DOUBLE {kLocPhysReg, 1,    0,       0,     1,  0,    0,   0,        1,    fr0,    fr1,         INVALID_SREG, INVALID_SREG}
 
-enum X86ResourceEncodingPos {
-  kX86GPReg0   = 0,
-  kX86RegSP    = 4,
-  kX86FPReg0   = 16,  // xmm0 .. xmm7/xmm15
-  kX86FPRegEnd   = 32,
-  kX86RegEnd   = kX86FPRegEnd,
+enum ResourceEncodingPos {
+  kGPReg0   = 0,
+  kRegSP    = 4,
+  kRegLR    = -1,
+  kFPReg0   = 16,  // xmm0 .. xmm7/xmm15
+  kFPRegEnd   = 32,
+  kRegEnd   = kFPRegEnd,
+  kCCode    = kRegEnd,
+  // The following four bits are for memory disambiguation
+  kDalvikReg,     // 1 Dalvik Frame (can be fully disambiguated)
+  kLiteral,       // 2 Literal pool (can be fully disambiguated)
+  kHeapRef,       // 3 Somewhere on the heap (alias with any other heap)
+  kMustNotAlias,  // 4 Guaranteed to be non-alias (eg *(r6+x))
 };
 
-#define ENCODE_X86_REG_LIST(N)      ((u8) N)
-#define ENCODE_X86_REG_SP           (1ULL << kX86RegSP)
+#define ENCODE_REG_LIST(N)      ((u8) N)
+#define ENCODE_REG_SP           (1ULL << kRegSP)
+#define ENCODE_CCODE            (1ULL << kCCode)
+#define ENCODE_FP_STATUS        (1ULL << kFPStatus)
+
+/* Abstract memory locations */
+#define ENCODE_DALVIK_REG       (1ULL << kDalvikReg)
+#define ENCODE_LITERAL          (1ULL << kLiteral)
+#define ENCODE_HEAP_REF         (1ULL << kHeapRef)
+#define ENCODE_MUST_NOT_ALIAS   (1ULL << kMustNotAlias)
+
+#define ENCODE_ALL              (~0ULL)
+#define ENCODE_MEM              (ENCODE_DALVIK_REG | ENCODE_LITERAL | \
+                                 ENCODE_HEAP_REF | ENCODE_MUST_NOT_ALIAS)
+
+#define DECODE_ALIAS_INFO_REG(X)        (X & 0xffff)
+#define DECODE_ALIAS_INFO_WIDE(X)       ((X & 0x80000000) ? 1 : 0)
+/* Not used for x86 */
+#define ENCODE_REG_PC           (ENCODE_ALL)
 
 /*
  * Annotate special-purpose core registers:
@@ -417,7 +444,7 @@
 struct X86EncodingMap {
   X86OpCode opcode;      // e.g. kOpAddRI
   X86EncodingKind kind;  // Used to discriminate in the union below
-  uint64_t flags;
+  int flags;
   struct {
   uint8_t prefix1;       // non-zero => a prefix byte
   uint8_t prefix2;       // non-zero => a second prefix byte
@@ -440,6 +467,85 @@
 #define kSY 0
 #define kST 0
 
+/* Bit flags describing the behavior of each native opcode */
+enum X86OpFeatureFlags {
+  kIsBranch = 0,
+  kRegDef0,
+  kRegDef1,
+  kRegDefA,
+  kRegDefD,
+  kRegDefSP,
+  kRegUse0,
+  kRegUse1,
+  kRegUse2,
+  kRegUse3,
+  kRegUse4,
+  kRegUseA,
+  kRegUseC,
+  kRegUseD,
+  kRegUseSP,
+  kNoOperand,
+  kIsUnaryOp,
+  kIsBinaryOp,
+  kIsTertiaryOp,
+  kIsQuadOp,
+  kIsQuinOp,
+  kIsSextupleOp,
+  kIsIT,
+  kSetsCCodes,
+  kUsesCCodes,
+  kMemLoad,
+  kMemStore,
+  kPCRelFixup,
+// FIXME: add NEEDS_FIXUP to instruction attributes
+};
+
+#define IS_LOAD         (1 << kMemLoad)
+#define IS_STORE        (1 << kMemStore)
+#define IS_BRANCH       (1 << kIsBranch)
+#define REG_DEF0        (1 << kRegDef0)
+#define REG_DEF1        (1 << kRegDef1)
+#define REG_DEFA        (1 << kRegDefA)
+#define REG_DEFD        (1 << kRegDefD)
+#define REG_DEF_SP      (1 << kRegDefSP)
+#define REG_USE0        (1 << kRegUse0)
+#define REG_USE1        (1 << kRegUse1)
+#define REG_USE2        (1 << kRegUse2)
+#define REG_USE3        (1 << kRegUse3)
+#define REG_USE4        (1 << kRegUse4)
+#define REG_USEA        (1 << kRegUseA)
+#define REG_USEC        (1 << kRegUseC)
+#define REG_USED        (1 << kRegUseD)
+#define REG_USE_SP      (1 << kRegUseSP)
+#define NO_OPERAND      (1 << kNoOperand)
+#define IS_UNARY_OP     (1 << kIsUnaryOp)
+#define IS_BINARY_OP    (1 << kIsBinaryOp)
+#define IS_TERTIARY_OP  (1 << kIsTertiaryOp)
+#define IS_QUAD_OP      (1 << kIsQuadOp)
+#define IS_QUIN_OP      (1 << kIsQuinOp)
+#define IS_SEXTUPLE_OP  (1 << kIsSextupleOp)
+#define IS_IT           (1 << kIsIT)
+#define SETS_CCODES     (1 << kSetsCCodes)
+#define USES_CCODES     (1 << kUsesCCodes)
+#define NEEDS_FIXUP     (1 << kPCRelFixup)
+
+/*  attributes, included for compatibility */
+#define REG_DEF_FPCS_LIST0   (0)
+#define REG_DEF_FPCS_LIST2   (0)
+
+
+/* Common combo register usage patterns */
+#define REG_USE01       (REG_USE0 | REG_USE1)
+#define REG_USE02       (REG_USE0 | REG_USE2)
+#define REG_USE012      (REG_USE01 | REG_USE2)
+#define REG_USE014      (REG_USE01 | REG_USE4)
+#define REG_DEF0_USE0   (REG_DEF0 | REG_USE0)
+#define REG_DEF0_USE1   (REG_DEF0 | REG_USE1)
+#define REG_DEF0_USE12  (REG_DEF0_USE1 | REG_USE2)
+#define REG_DEFA_USEA   (REG_DEFA | REG_USEA)
+#define REG_DEFAD_USEA  (REG_DEFA_USEA | REG_DEFD)
+#define REG_DEFAD_USEAD (REG_DEFAD_USEA | REG_USED)
+
 /* Keys for target-specific scheduling and other optimization hints */
 enum X86TargetOptHints {
   kMaxHoistDistance,