diff --git a/llvm/lib/MC/MCParser/ELFAsmParser.cpp b/llvm/lib/MC/MCParser/ELFAsmParser.cpp
--- a/llvm/lib/MC/MCParser/ELFAsmParser.cpp
+++ b/llvm/lib/MC/MCParser/ELFAsmParser.cpp
@@ -331,6 +331,9 @@
     case 'G':
       flags |= ELF::SHF_GROUP;
       break;
+    case 'l':
+      flags |= ELF::SHF_X86_64_LARGE;
+      break;
     case 'R':
       if (TT.isOSSolaris())
         flags |= ELF::SHF_SUNW_NODISCARD;
diff --git a/llvm/test/MC/ELF/section.s b/llvm/test/MC/ELF/section.s
--- a/llvm/test/MC/ELF/section.s
+++ b/llvm/test/MC/ELF/section.s
@@ -268,6 +268,14 @@
 // CHECK-NEXT:       SHF_WRITE
 // CHECK-NEXT:     ]
 
+.section .large,"l"
+// CHECK:        Section {
+// CHECK:          Name: .large
+// CHECK-NEXT:     Type: SHT_PROGBITS
+// CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_X86_64_LARGE
+// CHECK-NEXT:     ]
+
 // Test SHT_LLVM_ODRTAB
 
 .section .odrtab,"e",@llvm_odrtab