diff --git a/llvm/lib/Target/X86/X86Subtarget.h b/llvm/lib/Target/X86/X86Subtarget.h
--- a/llvm/lib/Target/X86/X86Subtarget.h
+++ b/llvm/lib/Target/X86/X86Subtarget.h
@@ -843,6 +843,9 @@
 
   bool enableEarlyIfConversion() const override;
 
+  void getPostRAMutations(
+      std::vector<std::unique_ptr<ScheduleDAGMutation>> &Mutations) const;
+
   AntiDepBreakMode getAntiDepBreakMode() const override {
     return TargetSubtargetInfo::ANTIDEP_CRITICAL;
   }
diff --git a/llvm/lib/Target/X86/X86Subtarget.cpp b/llvm/lib/Target/X86/X86Subtarget.cpp
--- a/llvm/lib/Target/X86/X86Subtarget.cpp
+++ b/llvm/lib/Target/X86/X86Subtarget.cpp
@@ -14,6 +14,7 @@
 
 #include "X86CallLowering.h"
 #include "X86LegalizerInfo.h"
+#include "X86MacroFusion.h"
 #include "X86RegisterBankInfo.h"
 #include "X86Subtarget.h"
 #include "MCTargetDesc/X86BaseInfo.h"
@@ -366,3 +367,8 @@
 bool X86Subtarget::enableEarlyIfConversion() const {
   return hasCMov() && X86EarlyIfConv;
 }
+
+void X86Subtarget::getPostRAMutations(
+    std::vector<std::unique_ptr<ScheduleDAGMutation>> &Mutations) const {
+  Mutations.push_back(createX86MacroFusionDAGMutation());
+}
diff --git a/llvm/test/CodeGen/X86/testb-je-fusion.ll b/llvm/test/CodeGen/X86/testb-je-fusion.ll
--- a/llvm/test/CodeGen/X86/testb-je-fusion.ll
+++ b/llvm/test/CodeGen/X86/testb-je-fusion.ll
@@ -45,8 +45,8 @@
 ; BRANCHFUSION_POSTRA-LABEL: macrofuse_test_je:
 ; BRANCHFUSION_POSTRA:       # %bb.0: # %entry
 ; BRANCHFUSION_POSTRA-NEXT:    xorl %eax, %eax
-; BRANCHFUSION_POSTRA-NEXT:    testl $512, %edi # imm = 0x200
 ; BRANCHFUSION_POSTRA-NEXT:    movb $1, (%rsi)
+; BRANCHFUSION_POSTRA-NEXT:    testl $512, %edi # imm = 0x200
 ; BRANCHFUSION_POSTRA-NEXT:    je .LBB0_2
 ; BRANCHFUSION_POSTRA-NEXT:  # %bb.1: # %if.then
 ; BRANCHFUSION_POSTRA-NEXT:    movl $1, %eax
@@ -105,8 +105,8 @@
 ;
 ; BRANCHFUSION_POSTRA-LABEL: macrofuse_cmp_je:
 ; BRANCHFUSION_POSTRA:       # %bb.0: # %entry
-; BRANCHFUSION_POSTRA-NEXT:    cmpl $512, %edi # imm = 0x200
 ; BRANCHFUSION_POSTRA-NEXT:    movb $1, (%rsi)
+; BRANCHFUSION_POSTRA-NEXT:    cmpl $512, %edi # imm = 0x200
 ; BRANCHFUSION_POSTRA-NEXT:    je .LBB1_1
 ; BRANCHFUSION_POSTRA-NEXT:  # %bb.2: # %if.then
 ; BRANCHFUSION_POSTRA-NEXT:    movl $1, %eax