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If a pattern's root node is a constant, its size should be 3 rather than 2.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25870 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-02-01 06:06:31 +00:00
parent 09f0bd39b1
commit 657416cfba
1 changed files with 4 additions and 0 deletions
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4
utils/TableGen/DAGISelEmitter.cpp
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@ -1709,6 +1709,10 @@ static unsigned getPatternSize(TreePatternNode *P, DAGISelEmitter &ISE) {
P->getExtTypeNum(0) == MVT::Flag &&
"Not a valid pattern node to size!");
unsigned Size = 2; // The node itself.
// If the root node is a ConstantSDNode, increases its size.
// e.g. (set R32:$dst, 0).
if (P->isLeaf() && dynamic_cast<IntInit*>(P->getLeafValue()))
Size++;
// FIXME: This is a hack to statically increase the priority of patterns
// which maps a sub-dag to a complex pattern. e.g. favors LEA over ADD.