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Describe which dependencies are relevant to noalias, and document how

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AliasAnalyses have the choice to respect noalias.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107544 91177308-0d34-0410-b5e6-96231b3b80d8
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Dan Gohman
2010-07-02 23:46:54 +00:00
parent 03560600b4
commit efca7f9681
2 changed files with 11 additions and 1 deletions
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@@ -201,6 +201,11 @@ freed and reallocated between accesses through one pointer and accesses through
the other -- in this case, there is a dependence, but it's mediated by the free
and reallocation.</p>
<p>As an exception to this is with the
<a href="LangRef.html#noalias"><tt>noalias</tt></a> keyword. AliasAnalysis
implementations may choose to ignore the "irrelevant" dependencies, provided
their clients do not need to be aware of these dependencies for correctness.</p>
<p>The MayAlias response is used whenever the two pointers might refer to the
same object. If the two memory objects overlap, but do not start at the same
location, return MayAlias.</p>