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[RewriteStatepointsForGC] Avoid inserting empty holder

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We use dummy calls to adjust the liveness of values over statepoints in the midst of the insertion.  If there are no values which need held live, there's no point in actually inserting the holder.  



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234779 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Philip Reames 2015-04-13 19:07:47 +00:00
parent 8ca57e685e
commit 7bea98826a
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
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@ -1571,6 +1571,10 @@ static Function *getUseHolder(Module &M) {
/// liftetime of the call.
static void insertUseHolderAfter(CallSite &CS, const ArrayRef<Value *> Values,
SmallVectorImpl<CallInst *> &holders) {
if (Values.empty())
// No values to hold live, might as well not insert the empty holder
return;
Module *M = CS.getInstruction()->getParent()->getParent()->getParent();
Function *Func = getUseHolder(*M);
if (CS.isCall()) {