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Any void readonly functions are provably dead, don't waste time adding

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nocapture attributes to them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61610 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2009-01-03 17:05:32 +00:00
parent 38a2cb9379
commit 3b3b4e3f0f
1 changed files with 0 additions and 14 deletions
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14
lib/Transforms/IPO/FunctionAttrs.cpp
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@ -307,20 +307,6 @@ bool FunctionAttrs::AddNoCaptureAttrs(const std::vector<CallGraphNode *> &SCC) {
// External node - skip it;
continue;
// If the function is readonly and doesn't return any value, we know that
// the pointer value is not captured. Mark all of its pointer arguments
// nocapture.
if (F->onlyReadsMemory() && F->getReturnType() == Type::VoidTy) {
for (Function::arg_iterator A = F->arg_begin(), E = F->arg_end();
A != E; ++A)
if (isa<PointerType>(A->getType()) && !A->hasNoCaptureAttr()) {
A->addAttr(Attribute::NoCapture);
++NumNoCapture;
Changed = true;
}
continue;
}
// Definitions with weak linkage may be overridden at linktime with
// something that writes memory, so treat them like declarations.
if (F->isDeclaration() || F->mayBeOverridden())