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revert this, this is safe, if conservative. leave a note to that effect

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27428 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Lenharth 2006-04-05 02:42:36 +00:00
parent c21a053729
commit aed967dbfe
1 changed files with 7 additions and 9 deletions
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16
lib/Analysis/DataStructure/Local.cpp
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@ -546,17 +546,15 @@ void GraphBuilder::visitCallSite(CallSite CS) {
case Intrinsic::vaend:
return; // noop
case Intrinsic::memcpy_i32:
case Intrinsic::memcpy_i64: {
//write first location
if (DSNode *N = getValueDest(**CS.arg_begin()).getNode())
N->setModifiedMarker();
//and read second pointer
if (DSNode *N = getValueDest(**(CS.arg_begin() + 1)).getNode())
N->setReadMarker();
return;
}
case Intrinsic::memcpy_i64:
case Intrinsic::memmove_i32:
case Intrinsic::memmove_i64: {
//This is over aggressive. What these functions do is not make the
// targets pointers alias, but rather merge the out edges 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.
//I might be wrong though.
// Merge the first & second arguments, and mark the memory read and
// modified.
DSNodeHandle RetNH = getValueDest(**CS.arg_begin());