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Factor out a helper. NFC

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Prep for porting to new PM.

llvm-svn: 272503
This commit is contained in:
Sean Silva 2016-06-12 05:44:51 +00:00
parent fb3bf38856
commit 918df98aed
1 changed files with 10 additions and 5 deletions
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15
lib/Transforms/IPO/FunctionAttrs.cpp
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@ -1203,10 +1203,7 @@ static bool addNoRecurseAttrsTopDown(Function &F) {
return setDoesNotRecurse(F);
}
bool ReversePostOrderFunctionAttrs::runOnModule(Module &M) {
if (skipModule(M))
return false;
static bool deduceFunctionAttributeInRPO(Module &M, CallGraph &CG) {
// We only have a post-order SCC traversal (because SCCs are inherently
// discovered in post-order), so we accumulate them in a vector and then walk
// it in reverse. This is simpler than using the RPO iterator infrastructure
@ -1214,7 +1211,6 @@ bool ReversePostOrderFunctionAttrs::runOnModule(Module &M) {
// graph. We can also cheat egregiously because we're primarily interested in
// synthesizing norecurse and so we can only save the singular SCCs as SCCs
// with multiple functions in them will clearly be recursive.
auto &CG = getAnalysis<CallGraphWrapperPass>().getCallGraph();
SmallVector<Function *, 16> Worklist;
for (scc_iterator<CallGraph *> I = scc_begin(&CG); !I.isAtEnd(); ++I) {
if (I->size() != 1)
@ -1232,3 +1228,12 @@ bool ReversePostOrderFunctionAttrs::runOnModule(Module &M) {
return Changed;
}
bool ReversePostOrderFunctionAttrs::runOnModule(Module &M) {
if (skipModule(M))
return false;
auto &CG = getAnalysis<CallGraphWrapperPass>().getCallGraph();
return deduceFunctionAttributeInRPO(M, CG);
}