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Tweak some comments.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56784 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2008-09-29 13:35:31 +00:00
parent 6aa812704f
commit 224c86ee77
1 changed files with 6 additions and 4 deletions
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10
lib/Transforms/IPO/AddReadAttrs.cpp
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@ -47,14 +47,14 @@ Pass *llvm::createAddReadAttrsPass() { return new AddReadAttrs(); }
bool AddReadAttrs::runOnSCC(const std::vector<CallGraphNode *> &SCC) {
CallGraph &CG = getAnalysis<CallGraph>();
// Check if any of the functions in the SCC read or write memory.
// If they write memory then just give up.
// Check if any of the functions in the SCC read or write memory. If they
// write memory then they can't be marked readnone or readonly.
bool ReadsMemory = false;
for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
Function *F = SCC[i]->getFunction();
if (F == 0)
// External node - may write memory.
// External node - may write memory. Just give up.
return false;
if (F->doesNotAccessMemory())
@ -65,7 +65,7 @@ bool AddReadAttrs::runOnSCC(const std::vector<CallGraphNode *> &SCC) {
// something that writes memory, so treat them like declarations.
if (F->isDeclaration() || F->mayBeOverridden()) {
if (!F->onlyReadsMemory())
// May write memory.
// May write memory. Just give up.
return false;
ReadsMemory = true;
@ -83,7 +83,9 @@ bool AddReadAttrs::runOnSCC(const std::vector<CallGraphNode *> &SCC) {
continue;
if (II->mayWriteToMemory())
// Writes memory. Just give up.
return false;
ReadsMemory |= II->mayReadFromMemory();
}
}