NFC. Introduce Value::getPointerDerferecnceableBytes
Extract a part of isDereferenceableAndAlignedPointer functionality to Value::getPointerDerferecnceableBytes. Currently it's a NFC, but in future I'm going to accumulate all the logic about value dereferenceability in this function similarly to Value::getPointerAlignment function (D16144).
Reviewed By: reames
Differential Revision: http://reviews.llvm.org/D17572
llvm-svn: 267708
diff --git a/llvm/lib/Analysis/Loads.cpp b/llvm/lib/Analysis/Loads.cpp
index 445e577..58a8723 100644
--- a/llvm/lib/Analysis/Loads.cpp
+++ b/llvm/lib/Analysis/Loads.cpp
@@ -33,34 +33,9 @@
assert(Offset.isNonNegative() && "offset can't be negative");
assert(Ty->isSized() && "must be sized");
- APInt DerefBytes(Offset.getBitWidth(), 0);
bool CheckForNonNull = false;
- if (const Argument *A = dyn_cast<Argument>(BV)) {
- DerefBytes = A->getDereferenceableBytes();
- if (!DerefBytes.getBoolValue()) {
- DerefBytes = A->getDereferenceableOrNullBytes();
- CheckForNonNull = true;
- }
- } else if (auto CS = ImmutableCallSite(BV)) {
- DerefBytes = CS.getDereferenceableBytes(0);
- if (!DerefBytes.getBoolValue()) {
- DerefBytes = CS.getDereferenceableOrNullBytes(0);
- CheckForNonNull = true;
- }
- } else if (const LoadInst *LI = dyn_cast<LoadInst>(BV)) {
- if (MDNode *MD = LI->getMetadata(LLVMContext::MD_dereferenceable)) {
- ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
- DerefBytes = CI->getLimitedValue();
- }
- if (!DerefBytes.getBoolValue()) {
- if (MDNode *MD =
- LI->getMetadata(LLVMContext::MD_dereferenceable_or_null)) {
- ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
- DerefBytes = CI->getLimitedValue();
- }
- CheckForNonNull = true;
- }
- }
+ APInt DerefBytes(Offset.getBitWidth(),
+ BV->getPointerDereferenceableBytes(CheckForNonNull));
if (DerefBytes.getBoolValue())
if (DerefBytes.uge(Offset + DL.getTypeStoreSize(Ty)))