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Avoids generating a legalization assert for the case where a vector type is legal
but when legalizing the operation, we split the vector type and generate a library call whose type needs to be promoted. For example, X86 with SSE on but MMX off, a divide v2i64 will be scalarized to 2 calls to a library using i64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63760 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -68,6 +68,11 @@ class VISIBILITY_HIDDEN SelectionDAGLegalize {
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/// being legalized (which could lead to non-serialized call sequences).
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bool IsLegalizingCall;
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/// IsLegalizingCallArguments - This member is used only for the purpose
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/// of providing assert to check for LegalizeTypes because legalizing an
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/// operation might introduce call nodes that might need type legalization.
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bool IsLegalizingCallArgs;
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enum LegalizeAction {
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Legal, // The target natively supports this operation.
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Promote, // This operation should be executed in a larger type.
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@ -368,6 +373,7 @@ SelectionDAGLegalize::SelectionDAGLegalize(SelectionDAG &dag, bool types)
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void SelectionDAGLegalize::LegalizeDAG() {
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LastCALLSEQ_END = DAG.getEntryNode();
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IsLegalizingCall = false;
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IsLegalizingCallArgs = false;
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// The legalize process is inherently a bottom-up recursive process (users
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// legalize their uses before themselves). Given infinite stack space, we
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@ -503,7 +509,7 @@ void SelectionDAGLegalize::HandleOp(SDValue Op) {
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// those) or for build vector used as a mask for a vector shuffle.
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// FIXME: We can removed the BUILD_VECTOR case when we fix PR2957.
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assert((TypesNeedLegalizing || getTypeAction(VT) == Legal ||
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Op.getOpcode() == ISD::TargetConstant ||
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IsLegalizingCallArgs || Op.getOpcode() == ISD::TargetConstant ||
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Op.getOpcode() == ISD::BUILD_VECTOR) &&
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"Illegal type introduced after type legalization?");
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switch (getTypeAction(VT)) {
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@ -1805,11 +1811,13 @@ SDValue SelectionDAGLegalize::LegalizeOp(SDValue Op) {
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// Recursively Legalize all of the inputs of the call end that do not lead
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// to this call start. This ensures that any libcalls that need be inserted
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// are inserted *before* the CALLSEQ_START.
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IsLegalizingCallArgs = true;
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{SmallPtrSet<SDNode*, 32> NodesLeadingTo;
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for (unsigned i = 0, e = CallEnd->getNumOperands(); i != e; ++i)
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LegalizeAllNodesNotLeadingTo(CallEnd->getOperand(i).getNode(), Node,
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NodesLeadingTo);
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}
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IsLegalizingCallArgs = false;
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// Now that we legalized all of the inputs (which may have inserted
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// libcalls) create the new CALLSEQ_START node.
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