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Inliner uses a smaller inline threshold for callees with cold attribute.

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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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren
2014-02-05 22:53:44 +00:00
parent 8147752976
commit df7da79db6
2 changed files with 99 additions and 0 deletions
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11
lib/Transforms/IPO/Inliner.cpp
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@ -50,6 +50,10 @@ static cl::opt<int>
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 @@ unsigned Inliner::getInlineThreshold(CallSite CS) const {
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;
}