diff --git a/llvm/lib/CodeGen/TargetPassConfig.cpp b/llvm/lib/CodeGen/TargetPassConfig.cpp
--- a/llvm/lib/CodeGen/TargetPassConfig.cpp
+++ b/llvm/lib/CodeGen/TargetPassConfig.cpp
@@ -1187,12 +1187,12 @@
   }
 
   // Machine function splitter uses the basic block sections feature. Both
-  // cannot be enabled at the same time.
-  if (TM->Options.EnableMachineFunctionSplitter ||
-      EnableMachineFunctionSplitter) {
-    addPass(createMachineFunctionSplitterPass());
-  } else if (TM->getBBSectionsType() != llvm::BasicBlockSection::None) {
+  // cannot be enabled at the same time. Basic block sections takes precedence.
+  if (TM->getBBSectionsType() != llvm::BasicBlockSection::None) {
     addPass(llvm::createBasicBlockSectionsPass(TM->getBBSectionsFuncListBuf()));
+  } else if (TM->Options.EnableMachineFunctionSplitter ||
+             EnableMachineFunctionSplitter) {
+    addPass(createMachineFunctionSplitterPass());
   }
 
   // Add passes that directly emit MI after all other MI passes.
diff --git a/llvm/test/CodeGen/X86/basic-block-sections-labels.ll b/llvm/test/CodeGen/X86/basic-block-sections-labels.ll
--- a/llvm/test/CodeGen/X86/basic-block-sections-labels.ll
+++ b/llvm/test/CodeGen/X86/basic-block-sections-labels.ll
@@ -1,6 +1,7 @@
 ; Check the basic block sections labels option
 ; RUN: llc < %s -mtriple=x86_64 -function-sections -unique-section-names=true -basic-block-sections=labels | FileCheck %s --check-prefix=UNIQ
 ; RUN: llc < %s -mtriple=x86_64 -function-sections -unique-section-names=false -basic-block-sections=labels | FileCheck %s --check-prefix=NOUNIQ
+; RUN: llc < %s -mtriple=x86_64 -function-sections -unique-section-names=true -basic-block-sections=labels -split-machine-functions | FileCheck %s --check-prefix=UNIQ
 
 define void @_Z3bazb(i1 zeroext) personality i32 (...)* @__gxx_personality_v0 {
   br i1 %0, label %2, label %7
diff --git a/llvm/test/CodeGen/X86/basic-block-sections-list.ll b/llvm/test/CodeGen/X86/basic-block-sections-list.ll
--- a/llvm/test/CodeGen/X86/basic-block-sections-list.ll
+++ b/llvm/test/CodeGen/X86/basic-block-sections-list.ll
@@ -1,6 +1,7 @@
 ; Check the basic block sections list option.
 ; RUN: echo '!_Z3foob' > %t
 ; RUN: llc < %s -mtriple=x86_64-pc-linux -function-sections -basic-block-sections=%t -unique-basic-block-section-names | FileCheck %s -check-prefix=LINUX-SECTIONS
+; RUN: llc < %s -mtriple=x86_64-pc-linux -function-sections -basic-block-sections=%t -unique-basic-block-section-names -split-machine-functions | FileCheck %s -check-prefix=LINUX-SECTIONS
 
 define i32 @_Z3foob(i1 zeroext %0) nounwind {
   %2 = alloca i32, align 4
diff --git a/llvm/test/CodeGen/X86/basic-block-sections.ll b/llvm/test/CodeGen/X86/basic-block-sections.ll
--- a/llvm/test/CodeGen/X86/basic-block-sections.ll
+++ b/llvm/test/CodeGen/X86/basic-block-sections.ll
@@ -1,5 +1,6 @@
 ; RUN: llc < %s -mtriple=x86_64-pc-linux -function-sections -basic-block-sections=all -unique-basic-block-section-names | FileCheck %s -check-prefix=LINUX-SECTIONS
 ; RUN: llc < %s -mtriple=i386-unknown-linux-gnu  -function-sections -basic-block-sections=all -unique-basic-block-section-names | FileCheck %s -check-prefix=LINUX-SECTIONS
+; RUN: llc < %s -mtriple=x86_64-pc-linux -function-sections -basic-block-sections=all -unique-basic-block-section-names -split-machine-functions | FileCheck %s -check-prefix=LINUX-SECTIONS
 
 define void @_Z3bazb(i1 zeroext) nounwind {
   %2 = alloca i8, align 1