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llvm.memc* improvements. helps PA a lot in some specmarks

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27811 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Lenharth
2006-04-18 19:54:11 +00:00
parent 80f362a48f
commit 2dbf23afb4
1 changed files with 11 additions and 4 deletions
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15
lib/Analysis/DataStructure/Local.cpp
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@@ -553,14 +553,21 @@ void GraphBuilder::visitCallSite(CallSite CS) {
// targets pointers alias, but rather merge the out edges of the graphs // targets pointers alias, but rather merge the out edges of the graphs
// for the pointers according to the type merging of the graphs. // for the pointers according to the type merging of the graphs.
//Simply merging the two graphs is a crude approximation to this. //Simply merging the two graphs is a crude approximation to this.
//Instead, copy the src pointer graph, then merge the copy with the
//dest pointer, thus avoiding contaminating the src with info from the dest
//I might be wrong though. //I might be wrong though.
// Merge the first & second arguments, and mark the memory read and // Merge the first & second arguments, and mark the memory read and
// modified. // modified. Preserve second graph
DSNodeHandle RetNH = getValueDest(**CS.arg_begin()); DSNodeHandle RetNH = getValueDest(**CS.arg_begin());
RetNH.mergeWith(getValueDest(**(CS.arg_begin()+1))); DSNodeHandle SrcNH = getValueDest(**(CS.arg_begin()+1));
DSNodeHandle Copy( new DSNode(*SrcNH.getNode(), SrcNH.getNode()->getParentGraph()),
SrcNH.getOffset());
RetNH.mergeWith(Copy);
if (DSNode *N = RetNH.getNode()) if (DSNode *N = RetNH.getNode())
N->setModifiedMarker()->setReadMarker(); N->setModifiedMarker();
if (DSNode *N = SrcNH.getNode())
N->setReadMarker();
return; return;
} }
case Intrinsic::memset_i32: case Intrinsic::memset_i32: