3 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index 461117c92b8..9e5bfb1f72b 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -684,6 +684,7 @@ lltok::Kind LLLexer::LexIdentifier() {
   KEYWORD(uwtable);
   KEYWORD(writeonly);
   KEYWORD(zeroext);
+  KEYWORD(immarg);
 
   KEYWORD(type);
   KEYWORD(opaque);
diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index 2a36bb18984..cba579d59a4 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -1310,6 +1310,7 @@ bool LLParser::ParseFnAttributeValuePairs(AttrBuilder &B,
     case lltok::kw_sret:
     case lltok::kw_swifterror:
     case lltok::kw_swiftself:
+    case lltok::kw_immarg:
       HaveError |=
         Error(Lex.getLoc(),
               "invalid use of parameter-only attribute on a function");
@@ -1603,6 +1604,7 @@ bool LLParser::ParseOptionalParamAttrs(AttrBuilder &B) {
     case lltok::kw_swiftself:       B.addAttribute(Attribute::SwiftSelf); break;
     case lltok::kw_writeonly:       B.addAttribute(Attribute::WriteOnly); break;
     case lltok::kw_zeroext:         B.addAttribute(Attribute::ZExt); break;
+    case lltok::kw_immarg:          B.addAttribute(Attribute::ImmArg); break;
 
     case lltok::kw_alignstack:
     case lltok::kw_alwaysinline:
@@ -1697,6 +1699,7 @@ bool LLParser::ParseOptionalReturnAttrs(AttrBuilder &B) {
     case lltok::kw_sret:
     case lltok::kw_swifterror:
     case lltok::kw_swiftself:
+    case lltok::kw_immarg:
       HaveError |= Error(Lex.getLoc(), "invalid use of parameter-only attribute");
       break;
 
diff --git a/llvm/lib/AsmParser/LLToken.h b/llvm/lib/AsmParser/LLToken.h
index 88eeae11a4b..50bdf05092a 100644
--- a/llvm/lib/AsmParser/LLToken.h
+++ b/llvm/lib/AsmParser/LLToken.h
@@ -226,6 +226,7 @@ enum Kind {
   kw_uwtable,
   kw_writeonly,
   kw_zeroext,
+  kw_immarg,
 
   kw_type,
   kw_opaque,