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don't allow 'imm' or specific imms, like '1' on the LHS of a binop.
This shrinks X86GenDAGISel by ~330 lines. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30574 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -800,6 +800,17 @@ bool TreePatternNode::ApplyTypeConstraints(TreePattern &TP, bool NotRegisters) {
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}
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}
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/// OnlyOnRHSOfCommutative - Return true if this value is only allowed on the
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/// RHS of a commutative operation, not the on LHS.
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static bool OnlyOnRHSOfCommutative(TreePatternNode *N) {
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if (!N->isLeaf() && N->getOperator()->getName() == "imm")
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return true;
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if (N->isLeaf() && dynamic_cast<IntInit*>(N->getLeafValue()))
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return true;
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return false;
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}
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/// canPatternMatch - If it is impossible for this pattern to match on this
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/// target, fill in Reason and return false. Otherwise, return true. This is
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/// used as a santity check for .td files (to prevent people from writing stuff
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@ -825,11 +836,9 @@ bool TreePatternNode::canPatternMatch(std::string &Reason, DAGISelEmitter &ISE){
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if (NodeInfo.hasProperty(SDNodeInfo::SDNPCommutative)) {
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// Scan all of the operands of the node and make sure that only the last one
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// is a constant node, unless the RHS also is.
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if (getChild(getNumChildren()-1)->isLeaf() ||
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getChild(getNumChildren()-1)->getOperator()->getName() != "imm") {
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if (!OnlyOnRHSOfCommutative(getChild(getNumChildren()-1))) {
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for (unsigned i = 0, e = getNumChildren()-1; i != e; ++i)
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if (!getChild(i)->isLeaf() &&
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getChild(i)->getOperator()->getName() == "imm") {
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if (OnlyOnRHSOfCommutative(getChild(i))) {
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Reason="Immediate value must be on the RHS of commutative operators!";
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return false;
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}
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