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Do not create ridiculously huge DSNodes, as described in the comments. 

This speeds up the BU pass on 172.mgrid from 62.3 -> 0.1242s.

llvm-svn: 20648
This commit is contained in:
Chris Lattner 2005-03-17 05:25:34 +00:00
parent 252f546ceb
commit 5251047abd
1 changed files with 21 additions and 1 deletions
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22
llvm/lib/Analysis/DataStructure/DataStructure.cpp
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@ -382,13 +382,23 @@ bool DSNode::mergeTypeInfo(const Type *NewTy, unsigned Offset,
// question....
assert(Offset == 0 && !isArray() &&
"Cannot have an offset into a void node!");
// If this node would have to have an unreasonable number of fields, just
// collapse it. This can occur for fortran common blocks, which have stupid
// things like { [100000000 x double], [1000000 x double] }.
unsigned NumFields = (NewTySize+DS::PointerSize-1) >> DS::PointerShift;
if (NumFields > 64) {
foldNodeCompletely();
return true;
}
Ty = NewTy;
NodeType &= ~Array;
if (WillBeArray) NodeType |= Array;
Size = NewTySize;
// Calculate the number of outgoing links from this node.
Links.resize((Size+DS::PointerSize-1) >> DS::PointerShift);
Links.resize(NumFields);
return false;
}
@ -418,6 +428,16 @@ bool DSNode::mergeTypeInfo(const Type *NewTy, unsigned Offset,
Ty = NewTy;
NodeType &= ~Array;
if (WillBeArray) NodeType |= Array;
// If this node would have to have an unreasonable number of fields, just
// collapse it. This can occur for fortran common blocks, which have stupid
// things like { [100000000 x double], [1000000 x double] }.
unsigned NumFields = (NewTySize+DS::PointerSize-1) >> DS::PointerShift;
if (NumFields > 64) {
foldNodeCompletely();
return true;
}
Size = NewTySize;
// Must grow links to be the appropriate size...