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* Minor optimization: when merging nodes, merge the smaller one into the 

larger one.
     * Handle the case where we are merging two nodes of different size better.

llvm-svn: 4476
This commit is contained in:
Chris Lattner 2002-10-31 22:41:15 +00:00
parent 5ef09c401b
commit c1d8820711
1 changed files with 13 additions and 3 deletions
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16
llvm/lib/Analysis/DataStructure/DataStructure.cpp
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@ -355,7 +355,7 @@ void DSNode::mergeWith(const DSNodeHandle &NH, unsigned Offset) {
// now completely folded.
//
if (isNodeCompletelyFolded()) {
NH.getNode()->foldNodeCompletely();
N->foldNodeCompletely();
} else if (NH.getNode()->isNodeCompletelyFolded()) {
foldNodeCompletely();
Offset = 0;
@ -367,6 +367,10 @@ void DSNode::mergeWith(const DSNodeHandle &NH, unsigned Offset) {
if (Offset > NH.getOffset()) {
N->mergeWith(DSNodeHandle(this, Offset), NH.getOffset());
return;
} else if (Offset == NH.getOffset() && getSize() < N->getSize()) {
// If the offsets are the same, merge the smaller node into the bigger node
N->mergeWith(DSNodeHandle(this, Offset), NH.getOffset());
return;
}
#if 0
@ -381,9 +385,15 @@ void DSNode::mergeWith(const DSNodeHandle &NH, unsigned Offset) {
//
unsigned NOffset = NH.getOffset()-Offset;
// If our destination node is too small... try to grow it.
if (N->getSize()+NOffset > getSize() &&
growNode(N->getSize()+NOffset)) {
// Catastrophic failure occured and we had to collapse the node. In this
// case, collapse the other node as well.
N->foldNodeCompletely();
NOffset = 0;
}
unsigned NSize = N->getSize();
assert(NSize+NOffset <= getSize() &&
"Don't know how to merge extend a merged nodes size yet!");
// Remove all edges pointing at N, causing them to point to 'this' instead.
// Make sure to adjust their offset, not just the node pointer.