//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "ipconstprop"
#include "llvm/Transforms/IPO.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"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Pass.h"
using namespace llvm;
+#define DEBUG_TYPE "ipconstprop"
+
STATISTIC(NumArgumentsProped, "Number of args turned into constants");
STATISTIC(NumReturnValProped, "Number of return values 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);
+ bool runOnModule(Module &M) override;
private:
bool PropagateConstantsIntoArguments(Function &F);
bool PropagateConstantReturn(Function &F);
}
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(); }
ArgumentConstants.resize(F.arg_size());
unsigned NumNonconstant = 0;
- for (Value::use_iterator UI = F.use_begin(), E = F.use_end(); UI != E; ++UI) {
+ for (Use &U : F.uses()) {
+ User *UR = U.getUser();
+ // Ignore blockaddress uses.
+ if (isa<BlockAddress>(UR)) 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>(UR) && !isa<InvokeInst>(UR))
return false;
- CallSite CS = CallSite::get(cast<Instruction>(*UI));
- if (!CS.isCallee(UI))
+ CallSite CS(cast<Instruction>(UR));
+ if (!CS.isCallee(&U))
return false;
// Check out all of the potentially constant arguments. Note that we don't
continue;
Constant *C = dyn_cast<Constant>(*AI);
- if (C && ArgumentConstants[i].first == 0) {
+ if (C && ArgumentConstants[i].first == nullptr) {
ArgumentConstants[i].first = C; // First constant seen.
} else if (C && ArgumentConstants[i].first == C) {
// Still the constant value we think it is.
for (unsigned i = 0, e = ArgumentConstants.size(); i != e; ++i, ++AI) {
// Do we have a constant argument?
if (ArgumentConstants[i].second || AI->use_empty() ||
- (AI->hasByValAttr() && !F.onlyReadsMemory()))
+ AI->hasInAllocaAttr() || (AI->hasByValAttr() && !F.onlyReadsMemory()))
continue;
Value *V = ArgumentConstants[i].first;
- if (V == 0) V = UndefValue::get(AI->getType());
+ if (!V) 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::getVoidTy(F.getContext()))
+ if (F.getReturnType()->isVoidTy())
return false; // No return value.
// If this function could be overridden later in the link stage, we can't
if (F.mayBeOverridden())
return false;
- LLVMContext &Context = F.getContext();
-
// 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(UndefValue::get(STy->getElementType(i)));
// 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
}
// Different or no known return value? Don't propagate this return
// value.
- RetVals[i] = 0;
- // All values non constant? Stop looking.
+ RetVals[i] = nullptr;
+ // All values non-constant? Stop looking.
if (++NumNonConstant == RetVals.size())
return false;
}
// over all users, replacing any uses of the return value with the returned
// constant.
bool MadeChange = false;
- for (Value::use_iterator UI = F.use_begin(), E = F.use_end(); UI != E; ++UI) {
- CallSite CS = CallSite::get(*UI);
+ for (Use &U : F.uses()) {
+ CallSite CS(U.getUser());
Instruction* Call = CS.getInstruction();
// Not a call instruction or a call instruction that's not calling F
// directly?
- if (!Call || !CS.isCallee(UI))
+ if (!Call || !CS.isCallee(&U))
continue;
// Call result not used?
MadeChange = true;
- if (STy == 0) {
+ if (!STy) {
Value* New = RetVals[0];
if (Argument *A = dyn_cast<Argument>(New))
// Was an argument returned? Then find the corresponding argument in
Call->replaceAllUsesWith(New);
continue;
}
-
- for (Value::use_iterator I = Call->use_begin(), E = Call->use_end();
- I != E;) {
+
+ for (auto I = Call->user_begin(), E = Call->user_end(); I != E;) {
Instruction *Ins = cast<Instruction>(*I);
// Increment now, so we can remove the use