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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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3
lib/Transforms/IPO/ArgumentPromotion.cpp
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@@ -36,6 +36,7 @@
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/CallGraphSCCPass.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/Constants.h"
@@ -321,7 +322,7 @@ static bool AllCallersPassInValidPointerForArgument(Argument *Arg) {
CallSite CS(U);
assert(CS && "Should only have direct calls!");
if (!CS.getArgument(ArgNo)->isDereferenceablePointer(DL))
if (!isDereferenceablePointer(CS.getArgument(ArgNo), DL))
return false;
}
return true;