Inliner uses a smaller inline threshold for callees with cold attribute.
Added command line option inlinecold-threshold to set threshold for inlining
functions with cold attribute. Listen to the cold attribute when it would
decrease the inline threshold.
llvm-svn: 200886
diff --git a/llvm/lib/Transforms/IPO/Inliner.cpp b/llvm/lib/Transforms/IPO/Inliner.cpp
index dc710d1..8647f39 100644
--- a/llvm/lib/Transforms/IPO/Inliner.cpp
+++ b/llvm/lib/Transforms/IPO/Inliner.cpp
@@ -50,6 +50,10 @@
HintThreshold("inlinehint-threshold", cl::Hidden, cl::init(325),
cl::desc("Threshold for inlining functions with inline hint"));
+static cl::opt<int>
+ColdThreshold("inlinecold-threshold", cl::Hidden, cl::init(75),
+ cl::desc("Threshold for inlining functions with cold attribute"));
+
// Threshold to use when optsize is specified (and there is no -inline-limit).
const int OptSizeThreshold = 75;
@@ -277,6 +281,13 @@
Attribute::MinSize))
thres = HintThreshold;
+ // Listen to the cold attribute when it would decrease the threshold.
+ bool ColdCallee = Callee && !Callee->isDeclaration() &&
+ Callee->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
+ Attribute::Cold);
+ if (ColdCallee && ColdThreshold < thres)
+ thres = ColdThreshold;
+
return thres;
}