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Move Value.isDereferenceablePointer to ValueTracking [NFC]

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Move isDereferenceablePointer function to Analysis. This function recursively tracks dereferencability over a chain of values like other functions in ValueTracking.

This refactoring is motivated by further changes to support dereferenceable_or_null attribute (http://reviews.llvm.org/D8650). isDereferenceablePointer will be extended to perform context-sensitive analysis and IR is not a good place to have such functionality.

Patch by: Artur Pilipenko <apilipenko@azulsystems.com>
Differential Revision: reviews.llvm.org/D9075




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235611 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Philip Reames
2015-04-23 17:36:48 +00:00
parent dab5145cb3
commit 1aa9710c60
9 changed files with 159 additions and 147 deletions
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2
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@@ -1204,7 +1204,7 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
II->addAttribute(AttributeSet::ReturnIndex, Attribute::NonNull);
// isDereferenceablePointer -> deref attribute
if (DerivedPtr->isDereferenceablePointer(DL)) {
if (isDereferenceablePointer(DerivedPtr, DL)) {
if (Argument *A = dyn_cast<Argument>(DerivedPtr)) {
uint64_t Bytes = A->getDereferenceableBytes();
II->addDereferenceableAttr(AttributeSet::ReturnIndex, Bytes);