Update to LLVM 3.5a.
Change-Id: Ifadecab779f128e62e430c2b4f6ddd84953ed617
diff --git a/lib/Transforms/IPO/ArgumentPromotion.cpp b/lib/Transforms/IPO/ArgumentPromotion.cpp
index df08091..48d3fba 100644
--- a/lib/Transforms/IPO/ArgumentPromotion.cpp
+++ b/lib/Transforms/IPO/ArgumentPromotion.cpp
@@ -37,13 +37,13 @@
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/CallGraphSCCPass.h"
+#include "llvm/IR/CFG.h"
+#include "llvm/IR/CallSite.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
-#include "llvm/Support/CFG.h"
-#include "llvm/Support/CallSite.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <set>
@@ -58,12 +58,12 @@
/// ArgPromotion - The 'by reference' to 'by value' argument promotion pass.
///
struct ArgPromotion : public CallGraphSCCPass {
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<AliasAnalysis>();
CallGraphSCCPass::getAnalysisUsage(AU);
}
- virtual bool runOnSCC(CallGraphSCC &SCC);
+ bool runOnSCC(CallGraphSCC &SCC) override;
static char ID; // Pass identification, replacement for typeid
explicit ArgPromotion(unsigned maxElements = 3)
: CallGraphSCCPass(ID), maxElements(maxElements) {
@@ -88,7 +88,7 @@
INITIALIZE_PASS_BEGIN(ArgPromotion, "argpromotion",
"Promote 'by reference' arguments to scalars", false, false)
INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
-INITIALIZE_PASS_DEPENDENCY(CallGraph)
+INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
INITIALIZE_PASS_END(ArgPromotion, "argpromotion",
"Promote 'by reference' arguments to scalars", false, false)
@@ -136,11 +136,10 @@
// transform functions that have indirect callers. Also see if the function
// is self-recursive.
bool isSelfRecursive = false;
- for (Value::use_iterator UI = F->use_begin(), E = F->use_end();
- UI != E; ++UI) {
- CallSite CS(*UI);
+ for (Use &U : F->uses()) {
+ CallSite CS(U.getUser());
// Must be a direct call.
- if (CS.getInstruction() == 0 || !CS.isCallee(UI)) return 0;
+ if (CS.getInstruction() == 0 || !CS.isCallee(&U)) return 0;
if (CS.getInstruction()->getParent()->getParent() == F)
isSelfRecursive = true;
@@ -155,7 +154,8 @@
Type *AgTy = cast<PointerType>(PtrArg->getType())->getElementType();
// If this is a byval argument, and if the aggregate type is small, just
- // pass the elements, which is always safe.
+ // pass the elements, which is always safe. This does not apply to
+ // inalloca.
if (PtrArg->hasByValAttr()) {
if (StructType *STy = dyn_cast<StructType>(AgTy)) {
if (maxElements > 0 && STy->getNumElements() > maxElements) {
@@ -201,7 +201,7 @@
}
// Otherwise, see if we can promote the pointer to its value.
- if (isSafeToPromoteArgument(PtrArg, PtrArg->hasByValAttr()))
+ if (isSafeToPromoteArgument(PtrArg, PtrArg->hasByValOrInAllocaAttr()))
ArgsToPromote.insert(PtrArg);
}
@@ -221,9 +221,8 @@
// Look at all call sites of the function. At this pointer we know we only
// have direct callees.
- for (Value::use_iterator UI = Callee->use_begin(), E = Callee->use_end();
- UI != E; ++UI) {
- CallSite CS(*UI);
+ for (User *U : Callee->users()) {
+ CallSite CS(U);
assert(CS && "Should only have direct calls!");
if (!CS.getArgument(ArgNo)->isDereferenceablePointer())
@@ -301,7 +300,8 @@
/// This method limits promotion of aggregates to only promote up to three
/// elements of the aggregate in order to avoid exploding the number of
/// arguments passed in.
-bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
+bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg,
+ bool isByValOrInAlloca) const {
typedef std::set<IndicesVector> GEPIndicesSet;
// Quick exit for unused arguments
@@ -323,6 +323,9 @@
//
// This set will contain all sets of indices that are loaded in the entry
// block, and thus are safe to unconditionally load in the caller.
+ //
+ // This optimization is also safe for InAlloca parameters, because it verifies
+ // that the address isn't captured.
GEPIndicesSet SafeToUnconditionallyLoad;
// This set contains all the sets of indices that we are planning to promote.
@@ -330,7 +333,7 @@
GEPIndicesSet ToPromote;
// If the pointer is always valid, any load with first index 0 is valid.
- if (isByVal || AllCallersPassInValidPointerForArgument(Arg))
+ if (isByValOrInAlloca || AllCallersPassInValidPointerForArgument(Arg))
SafeToUnconditionallyLoad.insert(IndicesVector(1, 0));
// First, iterate the entry block and mark loads of (geps of) arguments as
@@ -370,17 +373,16 @@
// not (GEP+)loads, or any (GEP+)loads that are not safe to promote.
SmallVector<LoadInst*, 16> Loads;
IndicesVector Operands;
- for (Value::use_iterator UI = Arg->use_begin(), E = Arg->use_end();
- UI != E; ++UI) {
- User *U = *UI;
+ for (Use &U : Arg->uses()) {
+ User *UR = U.getUser();
Operands.clear();
- if (LoadInst *LI = dyn_cast<LoadInst>(U)) {
+ if (LoadInst *LI = dyn_cast<LoadInst>(UR)) {
// Don't hack volatile/atomic loads
if (!LI->isSimple()) return false;
Loads.push_back(LI);
// Direct loads are equivalent to a GEP with a zero index and then a load.
Operands.push_back(0);
- } else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(U)) {
+ } else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(UR)) {
if (GEP->use_empty()) {
// Dead GEP's cause trouble later. Just remove them if we run into
// them.
@@ -389,7 +391,7 @@
// TODO: This runs the above loop over and over again for dead GEPs
// Couldn't we just do increment the UI iterator earlier and erase the
// use?
- return isSafeToPromoteArgument(Arg, isByVal);
+ return isSafeToPromoteArgument(Arg, isByValOrInAlloca);
}
// Ensure that all of the indices are constants.
@@ -401,9 +403,8 @@
return false; // Not a constant operand GEP!
// Ensure that the only users of the GEP are load instructions.
- for (Value::use_iterator UI = GEP->use_begin(), E = GEP->use_end();
- UI != E; ++UI)
- if (LoadInst *LI = dyn_cast<LoadInst>(*UI)) {
+ for (User *GEPU : GEP->users())
+ if (LoadInst *LI = dyn_cast<LoadInst>(GEPU)) {
// Don't hack volatile/atomic loads
if (!LI->isSimple()) return false;
Loads.push_back(LI);
@@ -549,16 +550,15 @@
// In this table, we will track which indices are loaded from the argument
// (where direct loads are tracked as no indices).
ScalarizeTable &ArgIndices = ScalarizedElements[I];
- for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E;
- ++UI) {
- Instruction *User = cast<Instruction>(*UI);
- assert(isa<LoadInst>(User) || isa<GetElementPtrInst>(User));
+ for (User *U : I->users()) {
+ Instruction *UI = cast<Instruction>(U);
+ assert(isa<LoadInst>(UI) || isa<GetElementPtrInst>(UI));
IndicesVector Indices;
- Indices.reserve(User->getNumOperands() - 1);
+ Indices.reserve(UI->getNumOperands() - 1);
// Since loads will only have a single operand, and GEPs only a single
// non-index operand, this will record direct loads without any indices,
// and gep+loads with the GEP indices.
- for (User::op_iterator II = User->op_begin() + 1, IE = User->op_end();
+ for (User::op_iterator II = UI->op_begin() + 1, IE = UI->op_end();
II != IE; ++II)
Indices.push_back(cast<ConstantInt>(*II)->getSExtValue());
// GEPs with a single 0 index can be merged with direct loads
@@ -566,11 +566,11 @@
Indices.clear();
ArgIndices.insert(Indices);
LoadInst *OrigLoad;
- if (LoadInst *L = dyn_cast<LoadInst>(User))
+ if (LoadInst *L = dyn_cast<LoadInst>(UI))
OrigLoad = L;
else
// Take any load, we will use it only to update Alias Analysis
- OrigLoad = cast<LoadInst>(User->use_back());
+ OrigLoad = cast<LoadInst>(UI->user_back());
OriginalLoads[std::make_pair(I, Indices)] = OrigLoad;
}
@@ -621,8 +621,8 @@
// Get the callgraph information that we need to update to reflect our
// changes.
- CallGraph &CG = getAnalysis<CallGraph>();
-
+ CallGraph &CG = getAnalysis<CallGraphWrapperPass>().getCallGraph();
+
// Get a new callgraph node for NF.
CallGraphNode *NF_CGN = CG.getOrInsertFunction(NF);
@@ -631,7 +631,7 @@
//
SmallVector<Value*, 16> Args;
while (!F->use_empty()) {
- CallSite CS(F->use_back());
+ CallSite CS(F->user_back());
assert(CS.getCalledFunction() == F);
Instruction *Call = CS.getInstruction();
const AttributeSet &CallPAL = CS.getAttributes();
@@ -807,6 +807,15 @@
I->replaceAllUsesWith(TheAlloca);
TheAlloca->takeName(I);
AA.replaceWithNewValue(I, TheAlloca);
+
+ // If the alloca is used in a call, we must clear the tail flag since
+ // the callee now uses an alloca from the caller.
+ for (User *U : TheAlloca->users()) {
+ CallInst *Call = dyn_cast<CallInst>(U);
+ if (!Call)
+ continue;
+ Call->setTailCall(false);
+ }
continue;
}
@@ -821,7 +830,7 @@
ScalarizeTable &ArgIndices = ScalarizedElements[I];
while (!I->use_empty()) {
- if (LoadInst *LI = dyn_cast<LoadInst>(I->use_back())) {
+ if (LoadInst *LI = dyn_cast<LoadInst>(I->user_back())) {
assert(ArgIndices.begin()->empty() &&
"Load element should sort to front!");
I2->setName(I->getName()+".val");
@@ -831,7 +840,7 @@
DEBUG(dbgs() << "*** Promoted load of argument '" << I->getName()
<< "' in function '" << F->getName() << "'\n");
} else {
- GetElementPtrInst *GEP = cast<GetElementPtrInst>(I->use_back());
+ GetElementPtrInst *GEP = cast<GetElementPtrInst>(I->user_back());
IndicesVector Operands;
Operands.reserve(GEP->getNumIndices());
for (User::op_iterator II = GEP->idx_begin(), IE = GEP->idx_end();
@@ -861,7 +870,7 @@
// All of the uses must be load instructions. Replace them all with
// the argument specified by ArgNo.
while (!GEP->use_empty()) {
- LoadInst *L = cast<LoadInst>(GEP->use_back());
+ LoadInst *L = cast<LoadInst>(GEP->user_back());
L->replaceAllUsesWith(TheArg);
AA.replaceWithNewValue(L, TheArg);
L->eraseFromParent();