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Generated isel should favors explicit constant operand (+2) over an operand with a predicate (+1).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30180 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-09-08 07:26:39 +00:00
parent fa12482d0c
commit 6cec34e094
1 changed files with 4 additions and 5 deletions
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9
utils/TableGen/DAGISelEmitter.cpp
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@ -768,7 +768,6 @@ bool TreePatternNode::ApplyTypeConstraints(TreePattern &TP, bool NotRegisters) {
if (OperandNode->isSubClassOf("RegisterClass")) {
const CodeGenRegisterClass &RC =
ISE.getTargetInfo().getRegisterClass(OperandNode);
//VT = RC.getValueTypeNum(0);
MadeChange |=getChild(i)->UpdateNodeType(ConvertVTs(RC.getValueTypes()),
TP);
} else if (OperandNode->isSubClassOf("Operand")) {
@ -1944,11 +1943,11 @@ static unsigned getPatternSize(TreePatternNode *P, DAGISelEmitter &ISE) {
P->getExtTypeNum(0) == MVT::Flag ||
P->getExtTypeNum(0) == MVT::iPTR) &&
"Not a valid pattern node to size!");
unsigned Size = 2; // The node itself.
unsigned Size = 3; // 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++;
Size += 2;
// 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.
@ -1957,7 +1956,7 @@ static unsigned getPatternSize(TreePatternNode *P, DAGISelEmitter &ISE) {
// calculate the complexity of all patterns a dag can potentially map to.
const ComplexPattern *AM = NodeGetComplexPattern(P, ISE);
if (AM)
Size += AM->getNumOperands() * 2;
Size += AM->getNumOperands() * 3;
// If this node has some predicate function that must match, it adds to the
// complexity of this node.
@ -1971,7 +1970,7 @@ static unsigned getPatternSize(TreePatternNode *P, DAGISelEmitter &ISE) {
Size += getPatternSize(Child, ISE);
else if (Child->isLeaf()) {
if (dynamic_cast<IntInit*>(Child->getLeafValue()))
Size += 3; // Matches a ConstantSDNode (+2) and a specific value (+1).
Size += 5; // Matches a ConstantSDNode (+3) and a specific value (+2).
else if (NodeIsComplexPattern(Child))
Size += getPatternSize(Child, ISE);
else if (!Child->getPredicateFn().empty())