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Fold arrays down to a single element. This causes huge wins on some benchmarks

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for example: 197.parser (64M->14M), 164.gzip (14M->2.7M).  The actual graphs
represented should not change at all.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4643 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2002-11-08 22:49:57 +00:00
parent 2779eff8b0
commit 23f83dce3f
1 changed files with 10 additions and 0 deletions
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10
lib/Analysis/DataStructure/DataStructure.cpp
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@ -131,6 +131,16 @@ bool DSNode::mergeTypeInfo(const Type *NewTy, unsigned Offset) {
// Return true immediately if the node is completely folded. // Return true immediately if the node is completely folded.
if (isNodeCompletelyFolded()) return true; if (isNodeCompletelyFolded()) return true;
// If this is an array type, eliminate the outside arrays because they won't
// be used anyway. This greatly reduces the size of large static arrays used
// as global variables, for example.
//
while (const ArrayType *AT = dyn_cast<ArrayType>(NewTy)) {
// FIXME: we might want to keep small arrays, but must be careful about
// things like: [2 x [10000 x int*]]
NewTy = AT->getElementType();
}
// Figure out how big the new type we're merging in is... // Figure out how big the new type we're merging in is...
unsigned NewTySize = NewTy->isSized() ? TD.getTypeSize(NewTy) : 0; unsigned NewTySize = NewTy->isSized() ? TD.getTypeSize(NewTy) : 0;