ThinLTO : Import always_inline functions irrespective of the threshold

Summary: A user can force a function to be inlined by specifying the always_inline attribute. Currently, thinlto implementation is not aware of always_inline functions and does not guarantee import of such functions, which in turn can prevent inlining of such functions.

Patch by Bharathi Seshadri <bseshadr@cisco.com>

Reviewers: tejohnson

Reviewed By: tejohnson

Subscribers: mehdi_amini, inglorion, hiraditya, steven_wu, dexonsmith, arphaman, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70014

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index c204a9448ce..e9d2dfc195b 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -8248,6 +8248,8 @@ bool LLParser::ParseFlag(unsigned &Val) {
 ///        [',' 'readOnly' ':' Flag]? [',' 'noRecurse' ':' Flag]?
 ///        [',' 'returnDoesNotAlias' ':' Flag]? ')'
 ///        [',' 'noInline' ':' Flag]? ')'
+///        [',' 'alwaysInline' ':' Flag]? ')'
+
 bool LLParser::ParseOptionalFFlags(FunctionSummary::FFlags &FFlags) {
   assert(Lex.getKind() == lltok::kw_funcFlags);
   Lex.Lex();
@@ -8289,6 +8291,12 @@ bool LLParser::ParseOptionalFFlags(FunctionSummary::FFlags &FFlags) {
         return true;
       FFlags.NoInline = Val;
       break;
+    case lltok::kw_alwaysInline:
+      Lex.Lex();
+      if (ParseToken(lltok::colon, "expected ':'") || ParseFlag(Val))
+        return true;
+      FFlags.AlwaysInline = Val;
+      break;
     default:
       return Error(Lex.getLoc(), "expected function flag type");
     }