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Integrate the readonly/readnone logic more deeply

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into alias analysis.  This meant updating the API
which now has versions of the getModRefBehavior,
doesNotAccessMemory and onlyReadsMemory methods
which take a callsite parameter.  These should be
used unless the callsite is not known, since in
general they can do a better job than the versions
that take a function.  Also, users should no longer
call the version of getModRefBehavior that takes
both a function and a callsite.  To reduce the
chance of misuse it is now protected.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44487 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2007-12-01 07:51:45 +00:00
parent e3110d0825
commit dff6710717
12 changed files with 122 additions and 90 deletions
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5
lib/Analysis/BasicAliasAnalysis.cpp
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@ -839,11 +839,6 @@ BasicAliasAnalysis::getModRefBehavior(Function *F, CallSite CS,
return UnknownModRefBehavior;
}
if (F->paramHasAttr(0, ParamAttr::ReadNone))
return DoesNotAccessMemory;
if (F->paramHasAttr(0, ParamAttr::ReadOnly))
return OnlyReadsMemory;
return UnknownModRefBehavior;
}