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[IPO/IPCP] Convert to use static functions. NFC.

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In preparation for porting this pass to the new PM.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268429 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Davide Italiano 2016-05-03 20:08:24 +00:00
parent f8e08351d3
commit 692cb17dfd
1 changed files with 32 additions and 35 deletions
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67
lib/Transforms/IPO/IPConstantPropagation.cpp
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@ -41,47 +41,14 @@ namespace {
} }
bool runOnModule(Module &M) override; bool runOnModule(Module &M) override;
private:
bool PropagateConstantsIntoArguments(Function &F);
bool PropagateConstantReturn(Function &F);
}; };
} }
char IPCP::ID = 0;
INITIALIZE_PASS(IPCP, "ipconstprop",
"Interprocedural constant propagation", false, false)
ModulePass *llvm::createIPConstantPropagationPass() { return new IPCP(); }
bool IPCP::runOnModule(Module &M) {
if (skipModule(M))
return false;
bool Changed = false;
bool LocalChange = true;
// FIXME: instead of using smart algorithms, we just iterate until we stop
// making changes.
while (LocalChange) {
LocalChange = false;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (!I->isDeclaration()) {
// Delete any klingons.
I->removeDeadConstantUsers();
if (I->hasLocalLinkage())
LocalChange |= PropagateConstantsIntoArguments(*I);
Changed |= PropagateConstantReturn(*I);
}
Changed |= LocalChange;
}
return Changed;
}
/// PropagateConstantsIntoArguments - Look at all uses of the specified /// PropagateConstantsIntoArguments - Look at all uses of the specified
/// function. If all uses are direct call sites, and all pass a particular /// function. If all uses are direct call sites, and all pass a particular
/// constant in for an argument, propagate that constant in as the argument. /// constant in for an argument, propagate that constant in as the argument.
/// ///
bool IPCP::PropagateConstantsIntoArguments(Function &F) { static bool PropagateConstantsIntoArguments(Function &F) {
if (F.arg_empty() || F.use_empty()) return false; // No arguments? Early exit. if (F.arg_empty() || F.use_empty()) return false; // No arguments? Early exit.
// For each argument, keep track of its constant value and whether it is a // For each argument, keep track of its constant value and whether it is a
@ -160,7 +127,7 @@ bool IPCP::PropagateConstantsIntoArguments(Function &F) {
// Additionally if a function always returns one of its arguments directly, // Additionally if a function always returns one of its arguments directly,
// callers will be updated to use the value they pass in directly instead of // callers will be updated to use the value they pass in directly instead of
// using the return value. // using the return value.
bool IPCP::PropagateConstantReturn(Function &F) { static bool PropagateConstantReturn(Function &F) {
if (F.getReturnType()->isVoidTy()) if (F.getReturnType()->isVoidTy())
return false; // No return value. return false; // No return value.
@ -281,3 +248,33 @@ bool IPCP::PropagateConstantReturn(Function &F) {
if (MadeChange) ++NumReturnValProped; if (MadeChange) ++NumReturnValProped;
return MadeChange; return MadeChange;
} }
char IPCP::ID = 0;
INITIALIZE_PASS(IPCP, "ipconstprop",
"Interprocedural constant propagation", false, false)
ModulePass *llvm::createIPConstantPropagationPass() { return new IPCP(); }
bool IPCP::runOnModule(Module &M) {
if (skipModule(M))
return false;
bool Changed = false;
bool LocalChange = true;
// FIXME: instead of using smart algorithms, we just iterate until we stop
// making changes.
while (LocalChange) {
LocalChange = false;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (!I->isDeclaration()) {
// Delete any klingons.
I->removeDeadConstantUsers();
if (I->hasLocalLinkage())
LocalChange |= PropagateConstantsIntoArguments(*I);
Changed |= PropagateConstantReturn(*I);
}
Changed |= LocalChange;
}
return Changed;
}