#define DEBUG_TYPE "ipconstprop"
#include "llvm/Transforms/IPO.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Constants.h"
#include "llvm/Instructions.h"
-#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
-#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Support/CallSite.h"
-#include "llvm/Support/Compiler.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/SmallVector.h"
using namespace llvm;
STATISTIC(NumArgumentsProped, "Number of args turned into constants");
namespace {
/// IPCP - The interprocedural constant propagation pass
///
- struct VISIBILITY_HIDDEN IPCP : public ModulePass {
+ struct IPCP : public ModulePass {
static char ID; // Pass identification, replacement for typeid
- IPCP() : ModulePass(&ID) {}
+ IPCP() : ModulePass(ID) {
+ initializeIPCPPass(*PassRegistry::getPassRegistry());
+ }
bool runOnModule(Module &M);
private:
}
char IPCP::ID = 0;
-static RegisterPass<IPCP>
-X("ipconstprop", "Interprocedural constant propagation");
+INITIALIZE_PASS(IPCP, "ipconstprop",
+ "Interprocedural constant propagation", false, false)
ModulePass *llvm::createIPConstantPropagationPass() { return new IPCP(); }
unsigned NumNonconstant = 0;
for (Value::use_iterator UI = F.use_begin(), E = F.use_end(); UI != E; ++UI) {
+ User *U = *UI;
+ // Ignore blockaddress uses.
+ if (isa<BlockAddress>(U)) continue;
+
// Used by a non-instruction, or not the callee of a function, do not
// transform.
- if (!isa<CallInst>(*UI) && !isa<InvokeInst>(*UI))
+ if (!isa<CallInst>(U) && !isa<InvokeInst>(U))
return false;
- CallSite CS = CallSite::get(cast<Instruction>(*UI));
+ CallSite CS(cast<Instruction>(U));
if (!CS.isCallee(UI))
return false;
Function::arg_iterator AI = F.arg_begin();
for (unsigned i = 0, e = ArgumentConstants.size(); i != e; ++i, ++AI) {
// Do we have a constant argument?
- if (ArgumentConstants[i].second || AI->use_empty())
+ if (ArgumentConstants[i].second || AI->use_empty() ||
+ (AI->hasByValAttr() && !F.onlyReadsMemory()))
continue;
Value *V = ArgumentConstants[i].first;
- if (V == 0) V = Context->getUndef(AI->getType());
+ if (V == 0) V = UndefValue::get(AI->getType());
AI->replaceAllUsesWith(V);
++NumArgumentsProped;
MadeChange = true;
// callers will be updated to use the value they pass in directly instead of
// using the return value.
bool IPCP::PropagateConstantReturn(Function &F) {
- if (F.getReturnType() == Type::VoidTy)
+ if (F.getReturnType()->isVoidTy())
return false; // No return value.
// If this function could be overridden later in the link stage, we can't
// propagate information about its results into callers.
if (F.mayBeOverridden())
return false;
-
+
// Check to see if this function returns a constant.
SmallVector<Value *,4> RetVals;
- const StructType *STy = dyn_cast<StructType>(F.getReturnType());
+ StructType *STy = dyn_cast<StructType>(F.getReturnType());
if (STy)
for (unsigned i = 0, e = STy->getNumElements(); i < e; ++i)
- RetVals.push_back(Context->getUndef(STy->getElementType(i)));
+ RetVals.push_back(UndefValue::get(STy->getElementType(i)));
else
- RetVals.push_back(Context->getUndef(F.getReturnType()));
+ RetVals.push_back(UndefValue::get(F.getReturnType()));
unsigned NumNonConstant = 0;
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
// Find the returned value
Value *V;
if (!STy)
- V = RI->getOperand(i);
+ V = RI->getOperand(0);
else
- V = FindInsertedValue(RI->getOperand(0), i, Context);
+ V = FindInsertedValue(RI->getOperand(0), i);
if (V) {
// Ignore undefs, we can change them into anything
// constant.
bool MadeChange = false;
for (Value::use_iterator UI = F.use_begin(), E = F.use_end(); UI != E; ++UI) {
- CallSite CS = CallSite::get(*UI);
+ CallSite CS(*UI);
Instruction* Call = CS.getInstruction();
// Not a call instruction or a call instruction that's not calling F