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Fix PR1975: dag isel emitter produces patterns that isel wrong flag result.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46776 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -3183,10 +3183,6 @@ SDNode *SelectionDAG::getTargetNode(unsigned Opcode,
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void SelectionDAG::ReplaceAllUsesWith(SDOperand FromN, SDOperand To,
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DAGUpdateListener *UpdateListener) {
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SDNode *From = FromN.Val;
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// FIXME: This works around a dag isel emitter bug.
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if (From->getNumValues() == 1 && FromN.ResNo != 0)
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return; // FIXME: THIS IS BOGUS
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assert(From->getNumValues() == 1 && FromN.ResNo == 0 &&
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"Cannot replace with this method!");
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assert(From != To.Val && "Cannot replace uses of with self");
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12
test/CodeGen/X86/2008-02-05-ISelCrash.ll
Normal file
12
test/CodeGen/X86/2008-02-05-ISelCrash.ll
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@ -0,0 +1,12 @@
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; RUN: llvm-as < %s | llc -march=x86
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; PR1975
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@nodes = external global i64 ; <i64*> [#uses=2]
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define fastcc i32 @ab(i32 %alpha, i32 %beta) nounwind {
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entry:
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%tmp1 = load i64* @nodes, align 8 ; <i64> [#uses=1]
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%tmp2 = add i64 %tmp1, 1 ; <i64> [#uses=1]
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store i64 %tmp2, i64* @nodes, align 8
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ret i32 0
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}
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@ -305,6 +305,8 @@ private:
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std::map<std::string, std::string> VariableMap;
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// Node to operator mapping
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std::map<std::string, Record*> OperatorMap;
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// Name of the folded node which produces a flag.
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std::pair<std::string, unsigned> FoldedFlag;
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// Names of all the folded nodes which produce chains.
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std::vector<std::pair<std::string, unsigned> > FoldedChains;
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// Original input chain(s).
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@ -587,8 +589,17 @@ public:
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emitCheck(RootName + ".getOpcode() == " +
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CInfo.getEnumName());
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EmitMatchCode(Child, Parent, RootName, ChainSuffix, FoundChain);
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if (NodeHasProperty(Child, SDNPHasChain, CGP))
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bool HasChain = false;
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if (NodeHasProperty(Child, SDNPHasChain, CGP)) {
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HasChain = true;
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FoldedChains.push_back(std::make_pair(RootName, CInfo.getNumResults()));
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}
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if (NodeHasProperty(Child, SDNPOutFlag, CGP)) {
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assert(FoldedFlag.first == "" && FoldedFlag.second == 0 &&
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"Pattern folded multiple nodes which produce flags?");
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FoldedFlag = std::make_pair(RootName,
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CInfo.getNumResults() + (unsigned)HasChain);
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}
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} else {
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// If this child has a name associated with it, capture it in VarMap. If
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// we already saw this in the pattern, emit code to verify dagness.
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@ -1105,9 +1116,15 @@ public:
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}
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if (NodeHasOutFlag) {
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if (FoldedFlag.first != "") {
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emitCode("ReplaceUses(SDOperand(" + FoldedFlag.first + ".Val, " +
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utostr(FoldedFlag.second) + "), InFlag);");
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} else {
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assert(NodeHasProperty(Pattern, SDNPOutFlag, CGP));
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emitCode("ReplaceUses(SDOperand(N.Val, " +
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utostr(NumPatResults + (unsigned)InputHasChain)
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+"), InFlag);");
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}
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NeedReplace = true;
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}
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