forked from OSchip/llvm-project
571 lines
20 KiB
C++
571 lines
20 KiB
C++
//===- DeadStoreElimination.cpp - Fast Dead Store Elimination -------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements a trivial dead store elimination that only considers
|
|
// basic-block local redundant stores.
|
|
//
|
|
// FIXME: This should eventually be extended to be a post-dominator tree
|
|
// traversal. Doing so would be pretty trivial.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "dse"
|
|
#include "llvm/Transforms/Scalar.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/Instructions.h"
|
|
#include "llvm/IntrinsicInst.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/ADT/SetVector.h"
|
|
#include "llvm/ADT/SmallPtrSet.h"
|
|
#include "llvm/ADT/Statistic.h"
|
|
#include "llvm/Analysis/AliasAnalysis.h"
|
|
#include "llvm/Analysis/Dominators.h"
|
|
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/Transforms/Utils/Local.h"
|
|
#include "llvm/Support/Compiler.h"
|
|
using namespace llvm;
|
|
|
|
STATISTIC(NumFastStores, "Number of stores deleted");
|
|
STATISTIC(NumFastOther , "Number of other instrs removed");
|
|
|
|
namespace {
|
|
struct VISIBILITY_HIDDEN DSE : public FunctionPass {
|
|
static char ID; // Pass identification, replacement for typeid
|
|
DSE() : FunctionPass(&ID) {}
|
|
|
|
virtual bool runOnFunction(Function &F) {
|
|
bool Changed = false;
|
|
for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
|
|
Changed |= runOnBasicBlock(*I);
|
|
return Changed;
|
|
}
|
|
|
|
bool runOnBasicBlock(BasicBlock &BB);
|
|
bool handleFreeWithNonTrivialDependency(FreeInst* F,
|
|
Instruction* dependency,
|
|
SetVector<Instruction*>& possiblyDead);
|
|
bool handleEndBlock(BasicBlock& BB, SetVector<Instruction*>& possiblyDead);
|
|
bool RemoveUndeadPointers(Value* pointer, uint64_t killPointerSize,
|
|
BasicBlock::iterator& BBI,
|
|
SmallPtrSet<Value*, 64>& deadPointers,
|
|
SetVector<Instruction*>& possiblyDead);
|
|
void DeleteDeadInstructionChains(Instruction *I,
|
|
SetVector<Instruction*> &DeadInsts);
|
|
|
|
|
|
// getAnalysisUsage - We require post dominance frontiers (aka Control
|
|
// Dependence Graph)
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesCFG();
|
|
AU.addRequired<DominatorTree>();
|
|
AU.addRequired<TargetData>();
|
|
AU.addRequired<AliasAnalysis>();
|
|
AU.addRequired<MemoryDependenceAnalysis>();
|
|
AU.addPreserved<DominatorTree>();
|
|
AU.addPreserved<AliasAnalysis>();
|
|
AU.addPreserved<MemoryDependenceAnalysis>();
|
|
}
|
|
};
|
|
}
|
|
|
|
char DSE::ID = 0;
|
|
static RegisterPass<DSE> X("dse", "Dead Store Elimination");
|
|
|
|
FunctionPass *llvm::createDeadStoreEliminationPass() { return new DSE(); }
|
|
|
|
bool DSE::runOnBasicBlock(BasicBlock &BB) {
|
|
MemoryDependenceAnalysis& MD = getAnalysis<MemoryDependenceAnalysis>();
|
|
TargetData &TD = getAnalysis<TargetData>();
|
|
|
|
// Record the last-seen store to this pointer
|
|
DenseMap<Value*, StoreInst*> lastStore;
|
|
// Record instructions possibly made dead by deleting a store
|
|
SetVector<Instruction*> possiblyDead;
|
|
|
|
bool MadeChange = false;
|
|
|
|
// Do a top-down walk on the BB
|
|
for (BasicBlock::iterator BBI = BB.begin(), BBE = BB.end();
|
|
BBI != BBE; ++BBI) {
|
|
// If we find a store or a free...
|
|
if (!isa<StoreInst>(BBI) && !isa<FreeInst>(BBI))
|
|
continue;
|
|
|
|
Value* pointer = 0;
|
|
if (StoreInst* S = dyn_cast<StoreInst>(BBI)) {
|
|
if (S->isVolatile())
|
|
continue;
|
|
pointer = S->getPointerOperand();
|
|
} else {
|
|
pointer = cast<FreeInst>(BBI)->getPointerOperand();
|
|
}
|
|
|
|
pointer = pointer->stripPointerCasts();
|
|
StoreInst*& last = lastStore[pointer];
|
|
bool deletedStore = false;
|
|
|
|
// ... to a pointer that has been stored to before...
|
|
if (last) {
|
|
Instruction* dep = MD.getDependency(BBI);
|
|
|
|
// ... and no other memory dependencies are between them....
|
|
while (dep != MemoryDependenceAnalysis::None &&
|
|
dep != MemoryDependenceAnalysis::NonLocal &&
|
|
isa<StoreInst>(dep)) {
|
|
if (dep != last ||
|
|
TD.getTypeStoreSize(last->getOperand(0)->getType()) >
|
|
TD.getTypeStoreSize(BBI->getOperand(0)->getType())) {
|
|
dep = MD.getDependency(BBI, dep);
|
|
continue;
|
|
}
|
|
|
|
// Remove it!
|
|
MD.removeInstruction(last);
|
|
|
|
// DCE instructions only used to calculate that store
|
|
if (Instruction* D = dyn_cast<Instruction>(last->getOperand(0)))
|
|
possiblyDead.insert(D);
|
|
if (Instruction* D = dyn_cast<Instruction>(last->getOperand(1)))
|
|
possiblyDead.insert(D);
|
|
|
|
last->eraseFromParent();
|
|
NumFastStores++;
|
|
deletedStore = true;
|
|
MadeChange = true;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Handle frees whose dependencies are non-trivial.
|
|
if (FreeInst* F = dyn_cast<FreeInst>(BBI)) {
|
|
if (!deletedStore)
|
|
MadeChange |= handleFreeWithNonTrivialDependency(F,
|
|
MD.getDependency(F),
|
|
possiblyDead);
|
|
// No known stores after the free
|
|
last = 0;
|
|
} else {
|
|
StoreInst* S = cast<StoreInst>(BBI);
|
|
|
|
// If we're storing the same value back to a pointer that we just
|
|
// loaded from, then the store can be removed;
|
|
if (LoadInst* L = dyn_cast<LoadInst>(S->getOperand(0))) {
|
|
Instruction* dep = MD.getDependency(S);
|
|
DominatorTree& DT = getAnalysis<DominatorTree>();
|
|
|
|
if (!S->isVolatile() && S->getParent() == L->getParent() &&
|
|
S->getPointerOperand() == L->getPointerOperand() &&
|
|
( dep == MemoryDependenceAnalysis::None ||
|
|
dep == MemoryDependenceAnalysis::NonLocal ||
|
|
DT.dominates(dep, L))) {
|
|
if (Instruction* D = dyn_cast<Instruction>(S->getOperand(0)))
|
|
possiblyDead.insert(D);
|
|
if (Instruction* D = dyn_cast<Instruction>(S->getOperand(1)))
|
|
possiblyDead.insert(D);
|
|
|
|
// Avoid iterator invalidation.
|
|
BBI--;
|
|
|
|
MD.removeInstruction(S);
|
|
S->eraseFromParent();
|
|
NumFastStores++;
|
|
MadeChange = true;
|
|
} else
|
|
// Update our most-recent-store map.
|
|
last = S;
|
|
} else
|
|
// Update our most-recent-store map.
|
|
last = S;
|
|
}
|
|
}
|
|
|
|
// If this block ends in a return, unwind, unreachable, and eventually
|
|
// tailcall, then all allocas are dead at its end.
|
|
if (BB.getTerminator()->getNumSuccessors() == 0)
|
|
MadeChange |= handleEndBlock(BB, possiblyDead);
|
|
|
|
// Do a trivial DCE
|
|
while (!possiblyDead.empty()) {
|
|
Instruction *I = possiblyDead.back();
|
|
possiblyDead.pop_back();
|
|
DeleteDeadInstructionChains(I, possiblyDead);
|
|
}
|
|
|
|
return MadeChange;
|
|
}
|
|
|
|
/// handleFreeWithNonTrivialDependency - Handle frees of entire structures whose
|
|
/// dependency is a store to a field of that structure
|
|
bool DSE::handleFreeWithNonTrivialDependency(FreeInst* F, Instruction* dep,
|
|
SetVector<Instruction*>& possiblyDead) {
|
|
TargetData &TD = getAnalysis<TargetData>();
|
|
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
|
|
MemoryDependenceAnalysis& MD = getAnalysis<MemoryDependenceAnalysis>();
|
|
|
|
if (dep == MemoryDependenceAnalysis::None ||
|
|
dep == MemoryDependenceAnalysis::NonLocal)
|
|
return false;
|
|
|
|
StoreInst* dependency = dyn_cast<StoreInst>(dep);
|
|
if (!dependency)
|
|
return false;
|
|
else if (dependency->isVolatile())
|
|
return false;
|
|
|
|
Value* depPointer = dependency->getPointerOperand();
|
|
const Type* depType = dependency->getOperand(0)->getType();
|
|
unsigned depPointerSize = TD.getTypeStoreSize(depType);
|
|
|
|
// Check for aliasing
|
|
AliasAnalysis::AliasResult A = AA.alias(F->getPointerOperand(), ~0U,
|
|
depPointer, depPointerSize);
|
|
|
|
if (A == AliasAnalysis::MustAlias) {
|
|
// Remove it!
|
|
MD.removeInstruction(dependency);
|
|
|
|
// DCE instructions only used to calculate that store
|
|
if (Instruction* D = dyn_cast<Instruction>(dependency->getOperand(0)))
|
|
possiblyDead.insert(D);
|
|
if (Instruction* D = dyn_cast<Instruction>(dependency->getOperand(1)))
|
|
possiblyDead.insert(D);
|
|
|
|
dependency->eraseFromParent();
|
|
NumFastStores++;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// handleEndBlock - Remove dead stores to stack-allocated locations in the
|
|
/// function end block. Ex:
|
|
/// %A = alloca i32
|
|
/// ...
|
|
/// store i32 1, i32* %A
|
|
/// ret void
|
|
bool DSE::handleEndBlock(BasicBlock& BB,
|
|
SetVector<Instruction*>& possiblyDead) {
|
|
TargetData &TD = getAnalysis<TargetData>();
|
|
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
|
|
MemoryDependenceAnalysis& MD = getAnalysis<MemoryDependenceAnalysis>();
|
|
|
|
bool MadeChange = false;
|
|
|
|
// Pointers alloca'd in this function are dead in the end block
|
|
SmallPtrSet<Value*, 64> deadPointers;
|
|
|
|
// Find all of the alloca'd pointers in the entry block
|
|
BasicBlock *Entry = BB.getParent()->begin();
|
|
for (BasicBlock::iterator I = Entry->begin(), E = Entry->end(); I != E; ++I)
|
|
if (AllocaInst *AI = dyn_cast<AllocaInst>(I))
|
|
deadPointers.insert(AI);
|
|
for (Function::arg_iterator AI = BB.getParent()->arg_begin(),
|
|
AE = BB.getParent()->arg_end(); AI != AE; ++AI)
|
|
if (AI->hasByValAttr())
|
|
deadPointers.insert(AI);
|
|
|
|
// Scan the basic block backwards
|
|
for (BasicBlock::iterator BBI = BB.end(); BBI != BB.begin(); ){
|
|
--BBI;
|
|
|
|
// If we find a store whose pointer is dead...
|
|
if (StoreInst* S = dyn_cast<StoreInst>(BBI)) {
|
|
if (!S->isVolatile()) {
|
|
// See through pointer-to-pointer bitcasts
|
|
Value* pointerOperand = S->getPointerOperand()->getUnderlyingObject();
|
|
|
|
// Alloca'd pointers or byval arguments (which are functionally like
|
|
// alloca's) are valid candidates for removal.
|
|
if (deadPointers.count(pointerOperand)) {
|
|
// Remove it!
|
|
MD.removeInstruction(S);
|
|
|
|
// DCE instructions only used to calculate that store
|
|
if (Instruction* D = dyn_cast<Instruction>(S->getOperand(0)))
|
|
possiblyDead.insert(D);
|
|
if (Instruction* D = dyn_cast<Instruction>(S->getOperand(1)))
|
|
possiblyDead.insert(D);
|
|
|
|
BBI++;
|
|
MD.removeInstruction(S);
|
|
S->eraseFromParent();
|
|
NumFastStores++;
|
|
MadeChange = true;
|
|
}
|
|
}
|
|
|
|
continue;
|
|
|
|
// We can also remove memcpy's to local variables at the end of a function
|
|
} else if (MemCpyInst* M = dyn_cast<MemCpyInst>(BBI)) {
|
|
Value* dest = M->getDest()->getUnderlyingObject();
|
|
|
|
if (deadPointers.count(dest)) {
|
|
MD.removeInstruction(M);
|
|
|
|
// DCE instructions only used to calculate that memcpy
|
|
if (Instruction* D = dyn_cast<Instruction>(M->getRawSource()))
|
|
possiblyDead.insert(D);
|
|
if (Instruction* D = dyn_cast<Instruction>(M->getLength()))
|
|
possiblyDead.insert(D);
|
|
if (Instruction* D = dyn_cast<Instruction>(M->getRawDest()))
|
|
possiblyDead.insert(D);
|
|
|
|
BBI++;
|
|
M->eraseFromParent();
|
|
NumFastOther++;
|
|
MadeChange = true;
|
|
|
|
continue;
|
|
}
|
|
|
|
// Because a memcpy is also a load, we can't skip it if we didn't remove it
|
|
}
|
|
|
|
Value* killPointer = 0;
|
|
uint64_t killPointerSize = ~0UL;
|
|
|
|
// If we encounter a use of the pointer, it is no longer considered dead
|
|
if (LoadInst* L = dyn_cast<LoadInst>(BBI)) {
|
|
// However, if this load is unused and not volatile, we can go ahead and
|
|
// remove it, and not have to worry about it making our pointer undead!
|
|
if (L->use_empty() && !L->isVolatile()) {
|
|
MD.removeInstruction(L);
|
|
|
|
// DCE instructions only used to calculate that load
|
|
if (Instruction* D = dyn_cast<Instruction>(L->getPointerOperand()))
|
|
possiblyDead.insert(D);
|
|
|
|
BBI++;
|
|
L->eraseFromParent();
|
|
NumFastOther++;
|
|
MadeChange = true;
|
|
possiblyDead.remove(L);
|
|
|
|
continue;
|
|
}
|
|
|
|
killPointer = L->getPointerOperand();
|
|
} else if (VAArgInst* V = dyn_cast<VAArgInst>(BBI)) {
|
|
killPointer = V->getOperand(0);
|
|
} else if (isa<MemCpyInst>(BBI) &&
|
|
isa<ConstantInt>(cast<MemCpyInst>(BBI)->getLength())) {
|
|
killPointer = cast<MemCpyInst>(BBI)->getSource();
|
|
killPointerSize = cast<ConstantInt>(
|
|
cast<MemCpyInst>(BBI)->getLength())->getZExtValue();
|
|
} else if (AllocaInst* A = dyn_cast<AllocaInst>(BBI)) {
|
|
deadPointers.erase(A);
|
|
|
|
// Dead alloca's can be DCE'd when we reach them
|
|
if (A->use_empty()) {
|
|
MD.removeInstruction(A);
|
|
|
|
// DCE instructions only used to calculate that load
|
|
if (Instruction* D = dyn_cast<Instruction>(A->getArraySize()))
|
|
possiblyDead.insert(D);
|
|
|
|
BBI++;
|
|
A->eraseFromParent();
|
|
NumFastOther++;
|
|
MadeChange = true;
|
|
possiblyDead.remove(A);
|
|
}
|
|
|
|
continue;
|
|
} else if (CallSite::get(BBI).getInstruction() != 0) {
|
|
// If this call does not access memory, it can't
|
|
// be undeadifying any of our pointers.
|
|
CallSite CS = CallSite::get(BBI);
|
|
if (AA.doesNotAccessMemory(CS))
|
|
continue;
|
|
|
|
unsigned modRef = 0;
|
|
unsigned other = 0;
|
|
|
|
// Remove any pointers made undead by the call from the dead set
|
|
std::vector<Value*> dead;
|
|
for (SmallPtrSet<Value*, 64>::iterator I = deadPointers.begin(),
|
|
E = deadPointers.end(); I != E; ++I) {
|
|
// HACK: if we detect that our AA is imprecise, it's not
|
|
// worth it to scan the rest of the deadPointers set. Just
|
|
// assume that the AA will return ModRef for everything, and
|
|
// go ahead and bail.
|
|
if (modRef >= 16 && other == 0) {
|
|
deadPointers.clear();
|
|
return MadeChange;
|
|
}
|
|
|
|
// Get size information for the alloca
|
|
unsigned pointerSize = ~0U;
|
|
if (AllocaInst* A = dyn_cast<AllocaInst>(*I)) {
|
|
if (ConstantInt* C = dyn_cast<ConstantInt>(A->getArraySize()))
|
|
pointerSize = C->getZExtValue() * \
|
|
TD.getABITypeSize(A->getAllocatedType());
|
|
} else {
|
|
const PointerType* PT = cast<PointerType>(
|
|
cast<Argument>(*I)->getType());
|
|
pointerSize = TD.getABITypeSize(PT->getElementType());
|
|
}
|
|
|
|
// See if the call site touches it
|
|
AliasAnalysis::ModRefResult A = AA.getModRefInfo(CS, *I, pointerSize);
|
|
|
|
if (A == AliasAnalysis::ModRef)
|
|
modRef++;
|
|
else
|
|
other++;
|
|
|
|
if (A == AliasAnalysis::ModRef || A == AliasAnalysis::Ref)
|
|
dead.push_back(*I);
|
|
}
|
|
|
|
for (std::vector<Value*>::iterator I = dead.begin(), E = dead.end();
|
|
I != E; ++I)
|
|
deadPointers.erase(*I);
|
|
|
|
continue;
|
|
} else {
|
|
// For any non-memory-affecting non-terminators, DCE them as we reach them
|
|
Instruction *CI = BBI;
|
|
if (!CI->isTerminator() && CI->use_empty() && !isa<FreeInst>(CI)) {
|
|
|
|
// DCE instructions only used to calculate that load
|
|
for (Instruction::op_iterator OI = CI->op_begin(), OE = CI->op_end();
|
|
OI != OE; ++OI)
|
|
if (Instruction* D = dyn_cast<Instruction>(OI))
|
|
possiblyDead.insert(D);
|
|
|
|
BBI++;
|
|
CI->eraseFromParent();
|
|
NumFastOther++;
|
|
MadeChange = true;
|
|
possiblyDead.remove(CI);
|
|
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (!killPointer)
|
|
continue;
|
|
|
|
killPointer = killPointer->getUnderlyingObject();
|
|
|
|
// Deal with undead pointers
|
|
MadeChange |= RemoveUndeadPointers(killPointer, killPointerSize, BBI,
|
|
deadPointers, possiblyDead);
|
|
}
|
|
|
|
return MadeChange;
|
|
}
|
|
|
|
/// RemoveUndeadPointers - check for uses of a pointer that make it
|
|
/// undead when scanning for dead stores to alloca's.
|
|
bool DSE::RemoveUndeadPointers(Value* killPointer, uint64_t killPointerSize,
|
|
BasicBlock::iterator& BBI,
|
|
SmallPtrSet<Value*, 64>& deadPointers,
|
|
SetVector<Instruction*>& possiblyDead) {
|
|
TargetData &TD = getAnalysis<TargetData>();
|
|
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
|
|
MemoryDependenceAnalysis& MD = getAnalysis<MemoryDependenceAnalysis>();
|
|
|
|
// If the kill pointer can be easily reduced to an alloca,
|
|
// don't bother doing extraneous AA queries
|
|
if (deadPointers.count(killPointer)) {
|
|
deadPointers.erase(killPointer);
|
|
return false;
|
|
} else if (isa<GlobalValue>(killPointer)) {
|
|
// A global can't be in the dead pointer set
|
|
return false;
|
|
}
|
|
|
|
bool MadeChange = false;
|
|
|
|
std::vector<Value*> undead;
|
|
|
|
for (SmallPtrSet<Value*, 64>::iterator I = deadPointers.begin(),
|
|
E = deadPointers.end(); I != E; ++I) {
|
|
// Get size information for the alloca
|
|
unsigned pointerSize = ~0U;
|
|
if (AllocaInst* A = dyn_cast<AllocaInst>(*I)) {
|
|
if (ConstantInt* C = dyn_cast<ConstantInt>(A->getArraySize()))
|
|
pointerSize = C->getZExtValue() * \
|
|
TD.getABITypeSize(A->getAllocatedType());
|
|
} else {
|
|
const PointerType* PT = cast<PointerType>(
|
|
cast<Argument>(*I)->getType());
|
|
pointerSize = TD.getABITypeSize(PT->getElementType());
|
|
}
|
|
|
|
// See if this pointer could alias it
|
|
AliasAnalysis::AliasResult A = AA.alias(*I, pointerSize,
|
|
killPointer, killPointerSize);
|
|
|
|
// If it must-alias and a store, we can delete it
|
|
if (isa<StoreInst>(BBI) && A == AliasAnalysis::MustAlias) {
|
|
StoreInst* S = cast<StoreInst>(BBI);
|
|
|
|
// Remove it!
|
|
MD.removeInstruction(S);
|
|
|
|
// DCE instructions only used to calculate that store
|
|
if (Instruction* D = dyn_cast<Instruction>(S->getOperand(0)))
|
|
possiblyDead.insert(D);
|
|
if (Instruction* D = dyn_cast<Instruction>(S->getOperand(1)))
|
|
possiblyDead.insert(D);
|
|
|
|
BBI++;
|
|
S->eraseFromParent();
|
|
NumFastStores++;
|
|
MadeChange = true;
|
|
|
|
continue;
|
|
|
|
// Otherwise, it is undead
|
|
} else if (A != AliasAnalysis::NoAlias)
|
|
undead.push_back(*I);
|
|
}
|
|
|
|
for (std::vector<Value*>::iterator I = undead.begin(), E = undead.end();
|
|
I != E; ++I)
|
|
deadPointers.erase(*I);
|
|
|
|
return MadeChange;
|
|
}
|
|
|
|
/// DeleteDeadInstructionChains - takes an instruction and a setvector of
|
|
/// dead instructions. If I is dead, it is erased, and its operands are
|
|
/// checked for deadness. If they are dead, they are added to the dead
|
|
/// setvector.
|
|
void DSE::DeleteDeadInstructionChains(Instruction *I,
|
|
SetVector<Instruction*> &DeadInsts) {
|
|
// Instruction must be dead.
|
|
if (!I->use_empty() || !isInstructionTriviallyDead(I)) return;
|
|
|
|
// Let the memory dependence know
|
|
getAnalysis<MemoryDependenceAnalysis>().removeInstruction(I);
|
|
|
|
// See if this made any operands dead. We do it this way in case the
|
|
// instruction uses the same operand twice. We don't want to delete a
|
|
// value then reference it.
|
|
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
|
|
if (I->getOperand(i)->hasOneUse())
|
|
if (Instruction* Op = dyn_cast<Instruction>(I->getOperand(i)))
|
|
DeadInsts.insert(Op); // Attempt to nuke it later.
|
|
|
|
I->setOperand(i, 0); // Drop from the operand list.
|
|
}
|
|
|
|
I->eraseFromParent();
|
|
++NumFastOther;
|
|
}
|