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add getPointerAddressSpace() to GEP instruction, use the method

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in a few scalar xforms to simplify things.

llvm-svn: 80506
This commit is contained in:
Chris Lattner 2009-08-30 20:06:40 +00:00
parent dc6b5be632
commit 784e8d9177
4 changed files with 10 additions and 9 deletions
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4
include/llvm/Instructions.h
View File

@ -570,6 +570,10 @@ public:
static unsigned getPointerOperandIndex() {
return 0U; // get index for modifying correct operand
}
unsigned getPointerAddressSpace() const {
return cast<PointerType>(getType())->getAddressSpace();
}
/// getPointerOperandType - Method to return the pointer operand as a
/// PointerType.

10
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -11289,8 +11289,7 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(Op)) {
const Value *GEPI0 = GEPI->getOperand(0);
// TODO: Consider a target hook for valid address spaces for this xform.
if (isa<ConstantPointerNull>(GEPI0) &&
cast<PointerType>(GEPI0->getType())->getAddressSpace() == 0) {
if (isa<ConstantPointerNull>(GEPI0) && GEPI->getPointerAddressSpace() == 0){
// Insert a new store to null instruction before the load to indicate
// that this code is not reachable. We do this instead of inserting
// an unreachable instruction directly because we cannot modify the
@ -11304,8 +11303,8 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
if (Constant *C = dyn_cast<Constant>(Op)) {
// load null/undef -> undef
// TODO: Consider a target hook for valid address spaces for this xform.
if (isa<UndefValue>(C) || (C->isNullValue() &&
cast<PointerType>(Op->getType())->getAddressSpace() == 0)) {
if (isa<UndefValue>(C) ||
(C->isNullValue() && LI.getPointerAddressSpace() == 0)) {
// Insert a new store to null instruction before the load to indicate that
// this code is not reachable. We do this instead of inserting an
// unreachable instruction directly because we cannot modify the CFG.
@ -11640,8 +11639,7 @@ Instruction *InstCombiner::visitStoreInst(StoreInst &SI) {
if (SI.isVolatile()) return 0; // Don't hack volatile stores.
// store X, null -> turns into 'unreachable' in SimplifyCFG
if (isa<ConstantPointerNull>(Ptr) &&
cast<PointerType>(Ptr->getType())->getAddressSpace() == 0) {
if (isa<ConstantPointerNull>(Ptr) && SI.getPointerAddressSpace() == 0) {
if (!isa<UndefValue>(Val)) {
SI.setOperand(0, UndefValue::get(Val->getType()));
if (Instruction *U = dyn_cast<Instruction>(Val))

3
lib/Transforms/Scalar/SCCP.cpp
View File

@ -1131,8 +1131,7 @@ void SCCPSolver::visitLoadInst(LoadInst &I) {
if (PtrVal.isConstant() && !I.isVolatile()) {
Value *Ptr = PtrVal.getConstant();
// TODO: Consider a target hook for valid address spaces for this xform.
if (isa<ConstantPointerNull>(Ptr) &&
cast<PointerType>(Ptr->getType())->getAddressSpace() == 0) {
if (isa<ConstantPointerNull>(Ptr) && I.getPointerAddressSpace() == 0) {
// load null -> null
markConstant(IV, &I, Constant::getNullValue(I.getType()));
return;

2
lib/Transforms/Scalar/SimplifyCFGPass.cpp
View File

@ -132,7 +132,7 @@ static bool MarkAliveBlocks(BasicBlock *BB,
if (isa<UndefValue>(Ptr) ||
(isa<ConstantPointerNull>(Ptr) &&
cast<PointerType>(Ptr->getType())->getAddressSpace() == 0)) {
SI->getPointerAddressSpace() == 0)) {
ChangeToUnreachable(SI, Context);
Changed = true;
break;