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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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7
include/llvm/Analysis/ValueTracking.h
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@ -186,6 +186,13 @@ namespace llvm {
/// are lifetime markers.
bool onlyUsedByLifetimeMarkers(const Value *V);
/// isDereferenceablePointer - Return true if this is always a dereferenceable
/// pointer.
///
/// Test if this value is always a pointer to allocated and suitably aligned
/// memory for a simple load or store.
bool isDereferenceablePointer(const Value *V, const DataLayout &DL);
/// isSafeToSpeculativelyExecute - Return true if the instruction does not
/// have any effects besides calculating the result and does not have
/// undefined behavior.