6 files changed, 30 insertions, 7 deletions
diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index 2a926d2e5e..8ad658d858 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -558,6 +558,7 @@ lltok::Kind LLLexer::LexIdentifier() {
   KEYWORD(readnone);
   KEYWORD(readonly);
 
+  KEYWORD(inlinehint);
   KEYWORD(noinline);
   KEYWORD(alwaysinline);
   KEYWORD(optsize);
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index ed74301624..5dd65691a3 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -947,6 +947,7 @@ bool LLParser::ParseOptionalAttrs(unsigned &Attrs, unsigned AttrKind) {
     case lltok::kw_noinline:        Attrs |= Attribute::NoInline; break;
     case lltok::kw_readnone:        Attrs |= Attribute::ReadNone; break;
     case lltok::kw_readonly:        Attrs |= Attribute::ReadOnly; break;
+    case lltok::kw_inlinehint:      Attrs |= Attribute::InlineHint; break;
     case lltok::kw_alwaysinline:    Attrs |= Attribute::AlwaysInline; break;
     case lltok::kw_optsize:         Attrs |= Attribute::OptimizeForSize; break;
     case lltok::kw_ssp:             Attrs |= Attribute::StackProtect; break;
diff --git a/lib/AsmParser/LLToken.h b/lib/AsmParser/LLToken.h
index 80eb194774..7f1807c7d0 100644
--- a/lib/AsmParser/LLToken.h
+++ b/lib/AsmParser/LLToken.h
@@ -85,6 +85,7 @@ namespace lltok {
     kw_readnone,
     kw_readonly,
 
+    kw_inlinehint,
     kw_noinline,
     kw_alwaysinline,
     kw_optsize,
diff --git a/lib/Target/CppBackend/CPPBackend.cpp b/lib/Target/CppBackend/CPPBackend.cpp
index 4f3f0047b3..3dd8ca7c71 100644
--- a/lib/Target/CppBackend/CPPBackend.cpp
+++ b/lib/Target/CppBackend/CPPBackend.cpp
@@ -470,6 +470,7 @@ namespace {
         HANDLE_ATTR(Nest);
         HANDLE_ATTR(ReadNone);
         HANDLE_ATTR(ReadOnly);
+        HANDLE_ATTR(InlineHint);
         HANDLE_ATTR(NoInline);
         HANDLE_ATTR(AlwaysInline);
         HANDLE_ATTR(OptimizeForSize);
diff --git a/lib/Transforms/IPO/Inliner.cpp b/lib/Transforms/IPO/Inliner.cpp
index 55cc536717..97e2f06394 100644
--- a/lib/Transforms/IPO/Inliner.cpp
+++ b/lib/Transforms/IPO/Inliner.cpp
@@ -41,6 +41,16 @@ static cl::opt<int>
 InlineLimit("inline-threshold", cl::Hidden, cl::init(225), cl::ZeroOrMore,
         cl::desc("Control the amount of inlining to perform (default = 225)"));
 
+static cl::opt<bool>
+RespectHint("respect-inlinehint", cl::Hidden,
+            cl::desc("Respect the inlinehint attribute"));
+
+// Threshold to use when inlinehint is given.
+const int HintThreshold = 300;
+
+// Threshold to use when optsize is specified (and there is no -inline-limit).
+const int OptSizeThreshold = 75;
+
 Inliner::Inliner(void *ID) 
   : CallGraphSCCPass(ID), InlineThreshold(InlineLimit) {}
 
@@ -172,13 +182,21 @@ static bool InlineCallIfPossible(CallSite CS, CallGraph &CG,
   return true;
 }
 
-unsigned Inliner::getInlineThreshold(Function* Caller) const {
+unsigned Inliner::getInlineThreshold(CallSite CS) const {
+  // Listen to inlinehint when -respect-inlinehint is given.
+  Function *Callee = CS.getCalledFunction();
+  if (RespectHint && Callee && !Callee->isDeclaration() &&
+      Callee->hasFnAttr(Attribute::InlineHint))
+    return HintThreshold;
+
+  // Listen to optsize when -inline-limit is not given.
+  Function *Caller = CS.getCaller();
   if (Caller && !Caller->isDeclaration() &&
       Caller->hasFnAttr(Attribute::OptimizeForSize) &&
       InlineLimit.getNumOccurrences() == 0)
-    return 75;
-  else
-    return InlineThreshold;
+      return OptSizeThreshold;
+
+  return InlineThreshold;
 }
 
 /// shouldInline - Return true if the inliner should attempt to inline
@@ -200,7 +218,7 @@ bool Inliner::shouldInline(CallSite CS) {
   
   int Cost = IC.getValue();
   Function *Caller = CS.getCaller();
-  int CurrentThreshold = getInlineThreshold(Caller);
+  int CurrentThreshold = getInlineThreshold(CS);
   float FudgeFactor = getInlineFudgeFactor(CS);
   if (Cost >= (int)(CurrentThreshold * FudgeFactor)) {
     DEBUG(dbgs() << "    NOT Inlining: cost=" << Cost
@@ -236,8 +254,7 @@ bool Inliner::shouldInline(CallSite CS) {
 
       outerCallsFound = true;
       int Cost2 = IC2.getValue();
-      Function *Caller2 = CS2.getCaller();
-      int CurrentThreshold2 = getInlineThreshold(Caller2);
+      int CurrentThreshold2 = getInlineThreshold(CS2);
       float FudgeFactor2 = getInlineFudgeFactor(CS2);
 
       if (Cost2 >= (int)(CurrentThreshold2 * FudgeFactor2))
diff --git a/lib/VMCore/Attributes.cpp b/lib/VMCore/Attributes.cpp
index 65155f1d48..a371c6f92e 100644
--- a/lib/VMCore/Attributes.cpp
+++ b/lib/VMCore/Attributes.cpp
@@ -56,6 +56,8 @@ std::string Attribute::getAsString(Attributes Attrs) {
     Result += "optsize ";
   if (Attrs & Attribute::NoInline)
     Result += "noinline ";
+  if (Attrs & Attribute::InlineHint)
+    Result += "inlinehint ";
   if (Attrs & Attribute::AlwaysInline)
     Result += "alwaysinline ";
   if (Attrs & Attribute::StackProtect)