Index: lib/CodeGen/SelectionDAG/FastISel.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/FastISel.cpp
+++ lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -1426,6 +1426,18 @@
     }
     return true;
   }
+  case Intrinsic::dbg_label: {
+    const DbgLabelInst *DI = cast<DbgLabelInst>(II);
+    assert(DI->getLabel() && "Missing label");
+    if (!FuncInfo.MF->getMMI().hasDebugInfo()) {
+      LLVM_DEBUG(dbgs() << "Dropping debug info for " << *DI << "\n");
+      return true;
+    }
+
+    BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
+            TII.get(TargetOpcode::DBG_LABEL)).addMetadata(DI->getLabel());
+    return true;
+  }
   case Intrinsic::objectsize: {
     ConstantInt *CI = cast<ConstantInt>(II->getArgOperand(1));
     unsigned long long Res = CI->isZero() ? -1ULL : 0;
Index: test/DebugInfo/Generic/debug-label-mi.ll
===================================================================
--- test/DebugInfo/Generic/debug-label-mi.ll
+++ test/DebugInfo/Generic/debug-label-mi.ll
@@ -1,12 +1,12 @@
 ; Test DBG_LABEL MachineInstr for label debugging.
 ; REQUIRES: asserts
-; RUN: llc -fast-isel=false -debug-only=isel %s -o /dev/null 2> %t.debug
+; RUN: llc -debug-only=isel %s -o /dev/null 2> %t.debug
 ; RUN: cat %t.debug | FileCheck %s --check-prefix=CHECKMI
 ;
 ; CHECKMI: DBG_LABEL "top", debug-location !9
 ; CHECKMI: DBG_LABEL "done", debug-location !11
 ;
-; RUN: llc -fast-isel=false %s -o - | FileCheck %s --check-prefix=CHECKASM
+; RUN: llc %s -o - | FileCheck %s --check-prefix=CHECKASM
 ;
 ; CHECKASM: DEBUG_LABEL: foo:top
 ; CHECKASM: DEBUG_LABEL: foo:done
Index: test/DebugInfo/Generic/debug-label-opt.ll
===================================================================
--- test/DebugInfo/Generic/debug-label-opt.ll
+++ test/DebugInfo/Generic/debug-label-opt.ll
@@ -1,7 +1,7 @@
 ; Test DBG_LABEL MachineInstr under optimization.
 ; The test case is generated by clang with -O2 is on.
 ; REQUIRES: asserts
-; RUN: llc -fast-isel=false -debug-only=isel %s -o /dev/null 2> %t.debug
+; RUN: llc -debug-only=isel %s -o /dev/null 2> %t.debug
 ; RUN: cat %t.debug | FileCheck %s --check-prefix=CHECKMI
 ;
 ; CHECKMI: DBG_LABEL "end_sum", debug-location !17
Index: test/DebugInfo/Generic/debug-label.ll
===================================================================
--- test/DebugInfo/Generic/debug-label.ll
+++ test/DebugInfo/Generic/debug-label.ll
@@ -1,4 +1,4 @@
-; RUN: llc -fast-isel=false -O0 -filetype=obj -o - %s | llvm-dwarfdump -v - | FileCheck %s
+; RUN: llc -O0 -filetype=obj -o - %s | llvm-dwarfdump -v - | FileCheck %s
 ;
 ; CHECK: .debug_info contents:
 ; CHECK: DW_TAG_label
@@ -13,7 +13,7 @@
 ; CHECK-NEXT: DW_AT_low_pc [DW_FORM_addr] {{.*}}{{0x[0-9a-f]+}}
 ; CHECK-NOT: DW_AT_name [DW_FORM_strp] {{.*}}"top"
 ;
-; RUN: llc -fast-isel=false -O0 -o - %s | FileCheck %s -check-prefix=ASM
+; RUN: llc -O0 -o - %s | FileCheck %s -check-prefix=ASM
 ;
 ; ASM: [[TOP_LOW_PC:[.0-9a-zA-Z]+]]:{{[[:space:]].*}}DEBUG_LABEL: foo:top
 ; ASM: [[DONE_LOW_PC:[.0-9a-zA-Z]+]]:{{[[:space:]].*}}DEBUG_LABEL: foo:done