diff --git a/js/src/ion/shared/Lowering-x86-shared.cpp b/js/src/ion/shared/Lowering-x86-shared.cpp
index 5a3a3dde8f9..46a71d4c503 100644
--- a/js/src/ion/shared/Lowering-x86-shared.cpp
+++ b/js/src/ion/shared/Lowering-x86-shared.cpp
@@ -70,6 +70,39 @@ LIRGeneratorX86Shared::visitPowHalf(MPowHalf *ins)
     return defineReuseInput(lir, ins, 0);
 }
 
+bool
+LIRGeneratorX86Shared::lowerForShift(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir,
+                                     MDefinition *lhs, MDefinition *rhs)
+{
+    ins->setOperand(0, useRegisterAtStart(lhs));
+
+    // shift operator should be constant or in register ecx
+    // x86 can't shift a non-ecx register
+    if (rhs->isConstant())
+        ins->setOperand(1, useOrConstant(rhs));
+    else
+        ins->setOperand(1, useFixed(rhs, ecx));
+
+    return defineReuseInput(ins, mir, 0);
+}
+
+bool
+LIRGeneratorX86Shared::lowerForALU(LInstructionHelper<1, 1, 0> *ins, MDefinition *mir,
+                                   MDefinition *input)
+{
+    ins->setOperand(0, useRegisterAtStart(input));
+    return defineReuseInput(ins, mir, 0);
+}
+
+bool
+LIRGeneratorX86Shared::lowerForALU(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir,
+                                   MDefinition *lhs, MDefinition *rhs)
+{
+    ins->setOperand(0, useRegisterAtStart(lhs));
+    ins->setOperand(1, useOrConstant(rhs));
+    return defineReuseInput(ins, mir, 0);
+}
+
 bool
 LIRGeneratorX86Shared::lowerMulI(MMul *mul, MDefinition *lhs, MDefinition *rhs)
 {
@@ -198,3 +231,12 @@ LIRGeneratorX86Shared::visitConstant(MConstant *ins)
     return LIRGeneratorShared::visitConstant(ins);
 }
 
+bool
+LIRGeneratorX86Shared::lowerTruncateDToInt32(MTruncateToInt32 *ins)
+{
+    MDefinition *opd = ins->input();
+    JS_ASSERT(opd->type() == MIRType_Double);
+
+    LDefinition maybeTemp = Assembler::HasSSE3() ? LDefinition::BogusTemp() : tempFloat();
+    return define(new LTruncateDToInt32(useRegister(opd), maybeTemp), ins);
+}
diff --git a/js/src/ion/shared/Lowering-x86-shared.h b/js/src/ion/shared/Lowering-x86-shared.h
index 7a299269937..d7c450bdd14 100644
--- a/js/src/ion/shared/Lowering-x86-shared.h
+++ b/js/src/ion/shared/Lowering-x86-shared.h
@@ -27,6 +27,11 @@ class LIRGeneratorX86Shared : public LIRGeneratorShared
     bool visitGuardShape(MGuardShape *ins);
     bool visitGuardObjectType(MGuardObjectType *ins);
     bool visitPowHalf(MPowHalf *ins);
+    bool lowerForShift(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs,
+                       MDefinition *rhs);
+    bool lowerForALU(LInstructionHelper<1, 1, 0> *ins, MDefinition *mir, MDefinition *input);
+    bool lowerForALU(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs,
+                     MDefinition *rhs);
     bool visitConstant(MConstant *ins);
     bool visitAsmJSNeg(MAsmJSNeg *ins);
     bool visitAsmJSUDiv(MAsmJSUDiv *ins);
@@ -36,6 +41,7 @@ class LIRGeneratorX86Shared : public LIRGeneratorShared
     bool lowerModI(MMod *mod);
     bool lowerUrshD(MUrsh *mir);
     bool lowerConstantDouble(double d, MInstruction *ins);
+    bool lowerTruncateDToInt32(MTruncateToInt32 *ins);
 };
 
 } // namespace ion
diff --git a/js/src/ion/x64/Lowering-x64.cpp b/js/src/ion/x64/Lowering-x64.cpp
index 99086a0edc1..e3ea4adb0a8 100644
--- a/js/src/ion/x64/Lowering-x64.cpp
+++ b/js/src/ion/x64/Lowering-x64.cpp
@@ -4,8 +4,9 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#include "ion/MIR.h"
 #include "Lowering-x64.h"
+
+#include "ion/MIR.h"
 #include "Assembler-x64.h"
 #include "ion/shared/Lowering-shared-inl.h"
 
@@ -78,36 +79,6 @@ LIRGeneratorX64::visitReturn(MReturn *ret)
     return add(ins);
 }
 
-bool
-LIRGeneratorX64::lowerForShift(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs, MDefinition *rhs)
-{
-    ins->setOperand(0, useRegisterAtStart(lhs));
-
-    // shift operator should be constant or in register rcx
-    // x86 can't shift a non-ecx register
-    if (rhs->isConstant())
-        ins->setOperand(1, useOrConstant(rhs));
-    else
-        ins->setOperand(1, useFixed(rhs, rcx));
-
-    return defineReuseInput(ins, mir, 0);
-}
-
-bool
-LIRGeneratorX64::lowerForALU(LInstructionHelper<1, 1, 0> *ins, MDefinition *mir, MDefinition *input)
-{
-    ins->setOperand(0, useRegisterAtStart(input));
-    return defineReuseInput(ins, mir, 0);
-}
-
-bool
-LIRGeneratorX64::lowerForALU(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs, MDefinition *rhs)
-{
-    ins->setOperand(0, useRegisterAtStart(lhs));
-    ins->setOperand(1, useOrConstant(rhs));
-    return defineReuseInput(ins, mir, 0);
-}
-
 bool
 LIRGeneratorX64::lowerForFPU(LMathD *ins, MDefinition *mir, MDefinition *lhs, MDefinition *rhs)
 {
@@ -206,15 +177,6 @@ LIRGeneratorX64::newLGetPropertyCacheT(MGetPropertyCache *ins)
     return new LGetPropertyCacheT(useRegister(ins->object()), LDefinition::BogusTemp());
 }
 
-bool
-LIRGeneratorX64::lowerTruncateDToInt32(MTruncateToInt32 *ins)
-{
-    MDefinition *opd = ins->input();
-    JS_ASSERT(opd->type() == MIRType_Double);
-
-    return define(new LTruncateDToInt32(useRegister(opd), LDefinition::BogusTemp()), ins);
-}
-
 bool
 LIRGeneratorX64::visitStoreTypedArrayElementStatic(MStoreTypedArrayElementStatic *ins)
 {
diff --git a/js/src/ion/x64/Lowering-x64.h b/js/src/ion/x64/Lowering-x64.h
index 3e781088020..6d49b121878 100644
--- a/js/src/ion/x64/Lowering-x64.h
+++ b/js/src/ion/x64/Lowering-x64.h
@@ -28,16 +28,8 @@ class LIRGeneratorX64 : public LIRGeneratorX86Shared
                 LUse::Policy policy = LUse::REGISTER, bool useAtStart = false);
     bool useBoxFixed(LInstruction *lir, size_t n, MDefinition *mir, Register reg1, Register);
 
-    bool lowerForShift(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs,
-                       MDefinition *rhs);
-
-    bool lowerForALU(LInstructionHelper<1, 1, 0> *ins, MDefinition *mir, MDefinition *input);
-    bool lowerForALU(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs,
-                     MDefinition *rhs);
     bool lowerForFPU(LMathD *ins, MDefinition *mir, MDefinition *lhs, MDefinition *rhs);
 
-    bool lowerTruncateDToInt32(MTruncateToInt32 *ins);
-
     LGetPropertyCacheT *newLGetPropertyCacheT(MGetPropertyCache *ins);
 
   public:
diff --git a/js/src/ion/x86/Lowering-x86.cpp b/js/src/ion/x86/Lowering-x86.cpp
index c477b1a549e..b540435083d 100644
--- a/js/src/ion/x86/Lowering-x86.cpp
+++ b/js/src/ion/x86/Lowering-x86.cpp
@@ -4,8 +4,9 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#include "Lowering-x86.h"
+
 #include "ion/MIR.h"
-#include "ion/Lowering.h"
 #include "Assembler-x86.h"
 #include "ion/shared/Lowering-shared-inl.h"
 
@@ -124,36 +125,6 @@ LIRGeneratorX86::visitReturn(MReturn *ret)
     return fillBoxUses(ins, 0, opd) && add(ins);
 }
 
-bool
-LIRGeneratorX86::lowerForShift(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs, MDefinition *rhs)
-{
-    ins->setOperand(0, useRegisterAtStart(lhs));
-
-    // shift operator should be constant or in register ecx
-    // x86 can't shift a non-ecx register
-    if (rhs->isConstant())
-        ins->setOperand(1, useOrConstant(rhs));
-    else
-        ins->setOperand(1, useFixed(rhs, ecx));
-
-    return defineReuseInput(ins, mir, 0);
-}
-
-bool
-LIRGeneratorX86::lowerForALU(LInstructionHelper<1, 1, 0> *ins, MDefinition *mir, MDefinition *input)
-{
-    ins->setOperand(0, useRegisterAtStart(input));
-    return defineReuseInput(ins, mir, 0);
-}
-
-bool
-LIRGeneratorX86::lowerForALU(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs, MDefinition *rhs)
-{
-    ins->setOperand(0, useRegisterAtStart(lhs));
-    ins->setOperand(1, useOrConstant(rhs));
-    return defineReuseInput(ins, mir, 0);
-}
-
 bool
 LIRGeneratorX86::lowerForFPU(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs, MDefinition *rhs)
 {
@@ -323,13 +294,3 @@ LIRGeneratorX86::newLGetPropertyCacheT(MGetPropertyCache *ins)
         scratch = LDefinition::BogusTemp();
     return new LGetPropertyCacheT(useRegister(ins->object()), scratch);
 }
-
-bool
-LIRGeneratorX86::lowerTruncateDToInt32(MTruncateToInt32 *ins)
-{
-    MDefinition *opd = ins->input();
-    JS_ASSERT(opd->type() == MIRType_Double);
-
-    LDefinition maybeTemp = Assembler::HasSSE3() ? LDefinition::BogusTemp() : tempFloat();
-    return define(new LTruncateDToInt32(useRegister(opd), maybeTemp), ins);
-}
diff --git a/js/src/ion/x86/Lowering-x86.h b/js/src/ion/x86/Lowering-x86.h
index d870ea6784c..29560ca21af 100644
--- a/js/src/ion/x86/Lowering-x86.h
+++ b/js/src/ion/x86/Lowering-x86.h
@@ -29,17 +29,9 @@ class LIRGeneratorX86 : public LIRGeneratorX86Shared
     void lowerUntypedPhiInput(MPhi *phi, uint32_t inputPosition, LBlock *block, size_t lirIndex);
     bool defineUntypedPhi(MPhi *phi, size_t lirIndex);
 
-    bool lowerForShift(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs,
-                       MDefinition *rhs);
-
-    bool lowerForALU(LInstructionHelper<1, 1, 0> *ins, MDefinition *mir, MDefinition *input);
-    bool lowerForALU(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs,
-                     MDefinition *rhs);
     bool lowerForFPU(LInstructionHelper<1, 2, 0> *ins, MDefinition *mir, MDefinition *lhs,
                      MDefinition *rhs);
 
-    bool lowerTruncateDToInt32(MTruncateToInt32 *ins);
-
     LGetPropertyCacheT *newLGetPropertyCacheT(MGetPropertyCache *ins);
 
   public: