mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-01 19:29:22 +00:00
rename a function and reduce some indentation, no functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120391 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
29b6cb40c1
commit
bbdc3703a3
@ -111,9 +111,9 @@ static bool hasMemoryWrite(Instruction *I) {
|
||||
return false;
|
||||
}
|
||||
|
||||
/// isElidable - If the value of this instruction and the memory it writes to is
|
||||
/// unused, may we delete this instrtction?
|
||||
static bool isElidable(Instruction *I) {
|
||||
/// isRemovable - If the value of this instruction and the memory it writes to
|
||||
/// is unused, may we delete this instruction?
|
||||
static bool isRemovable(Instruction *I) {
|
||||
assert(hasMemoryWrite(I));
|
||||
if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(I))
|
||||
return II->getIntrinsicID() != Intrinsic::lifetime_end;
|
||||
@ -192,6 +192,7 @@ static bool isStoreAtLeastAsWideAs(Instruction *I1, Instruction *I2,
|
||||
|
||||
bool DSE::runOnBasicBlock(BasicBlock &BB) {
|
||||
MemoryDependenceAnalysis &MD = getAnalysis<MemoryDependenceAnalysis>();
|
||||
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
|
||||
TD = getAnalysisIfAvailable<TargetData>();
|
||||
|
||||
bool MadeChange = false;
|
||||
@ -238,7 +239,7 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
if (!InstDep.isDef()) {
|
||||
// If this is a may-aliased store that is clobbering the store value, we
|
||||
// can keep searching past it for another must-aliased pointer that stores
|
||||
@ -249,7 +250,6 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
|
||||
// we can remove the first store to P even though we don't know if P and Q
|
||||
// alias.
|
||||
if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
|
||||
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
|
||||
AliasAnalysis::Location Loc = AA.getLocation(SI);
|
||||
while (InstDep.isClobber() && InstDep.getInst() != &BB.front()) {
|
||||
// Can't look past this instruction if it might read 'Loc'.
|
||||
@ -266,19 +266,21 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
|
||||
// long as this store is at least as big as it.
|
||||
if (InstDep.isDef() && hasMemoryWrite(InstDep.getInst())) {
|
||||
Instruction *DepStore = InstDep.getInst();
|
||||
if (isStoreAtLeastAsWideAs(Inst, DepStore, TD) && isElidable(DepStore)) {
|
||||
// Delete the store and now-dead instructions that feed it.
|
||||
DeleteDeadInstruction(DepStore);
|
||||
++NumFastStores;
|
||||
MadeChange = true;
|
||||
|
||||
// DeleteDeadInstruction can delete the current instruction in loop
|
||||
// cases, reset BBI.
|
||||
BBI = Inst;
|
||||
if (BBI != BB.begin())
|
||||
--BBI;
|
||||
if (!isRemovable(DepStore) ||
|
||||
!isStoreAtLeastAsWideAs(Inst, DepStore, TD))
|
||||
continue;
|
||||
}
|
||||
|
||||
// Delete the store and now-dead instructions that feed it.
|
||||
DeleteDeadInstruction(DepStore);
|
||||
++NumFastStores;
|
||||
MadeChange = true;
|
||||
|
||||
// DeleteDeadInstruction can delete the current instruction in loop
|
||||
// cases, reset BBI.
|
||||
BBI = Inst;
|
||||
if (BBI != BB.begin())
|
||||
--BBI;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
@ -301,7 +303,7 @@ bool DSE::HandleFree(CallInst *F) {
|
||||
if (Dep.isNonLocal()) return false;
|
||||
|
||||
Instruction *Dependency = Dep.getInst();
|
||||
if (!hasMemoryWrite(Dependency) || !isElidable(Dependency))
|
||||
if (!hasMemoryWrite(Dependency) || !isRemovable(Dependency))
|
||||
return false;
|
||||
|
||||
Value *DepPointer = getPointerOperand(Dependency)->getUnderlyingObject();
|
||||
@ -359,7 +361,7 @@ bool DSE::handleEndBlock(BasicBlock &BB) {
|
||||
|
||||
// If we find a store whose pointer is dead.
|
||||
if (hasMemoryWrite(BBI)) {
|
||||
if (isElidable(BBI)) {
|
||||
if (isRemovable(BBI)) {
|
||||
// See through pointer-to-pointer bitcasts
|
||||
Value *pointerOperand = getPointerOperand(BBI)->getUnderlyingObject();
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user