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Handle cracked instructions in dispatch group formation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26721 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -42,10 +42,8 @@ using namespace llvm;
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//
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// FIXME: This is missing some significant cases:
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// 1. Modeling of microcoded instructions.
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// 2. Handling of cracked instructions.
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// 3. Handling of serialized operations.
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// 4. Handling of the esoteric cases in "Resource-based Instruction Grouping",
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// e.g. integer divides that only execute in the second slot.
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// 2. Handling of serialized operations.
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// 3. Handling of the esoteric cases in "Resource-based Instruction Grouping".
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//
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PPCHazardRecognizer970::PPCHazardRecognizer970(const TargetInstrInfo &tii)
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@ -66,9 +64,10 @@ void PPCHazardRecognizer970::EndDispatchGroup() {
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PPCII::PPC970_Unit
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PPCHazardRecognizer970::GetInstrType(unsigned Opcode,
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bool &isFirst, bool &isSingle,
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bool &isCracked,
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bool &isLoad, bool &isStore) {
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if (Opcode < ISD::BUILTIN_OP_END) {
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isFirst = isSingle = isLoad = isStore = false;
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isFirst = isSingle = isCracked = isLoad = isStore = false;
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return PPCII::PPC970_Pseudo;
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}
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Opcode -= ISD::BUILTIN_OP_END;
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@ -82,6 +81,7 @@ PPCHazardRecognizer970::GetInstrType(unsigned Opcode,
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isFirst = TSFlags & PPCII::PPC970_First;
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isSingle = TSFlags & PPCII::PPC970_Single;
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isCracked = TSFlags & PPCII::PPC970_Cracked;
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return (PPCII::PPC970_Unit)(TSFlags & PPCII::PPC970_Mask);
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}
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@ -122,9 +122,10 @@ isLoadOfStoredAddress(unsigned LoadSize, SDOperand Ptr1, SDOperand Ptr2) const {
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/// pipeline flush.
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HazardRecognizer::HazardType PPCHazardRecognizer970::
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getHazardType(SDNode *Node) {
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bool isFirst, isSingle, isLoad, isStore;
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bool isFirst, isSingle, isCracked, isLoad, isStore;
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PPCII::PPC970_Unit InstrType =
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GetInstrType(Node->getOpcode(), isFirst, isSingle, isLoad, isStore);
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GetInstrType(Node->getOpcode(), isFirst, isSingle, isCracked,
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isLoad, isStore);
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if (InstrType == PPCII::PPC970_Pseudo) return NoHazard;
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unsigned Opcode = Node->getOpcode()-ISD::BUILTIN_OP_END;
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@ -133,6 +134,12 @@ getHazardType(SDNode *Node) {
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if (NumIssued != 0 && (isFirst || isSingle))
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return Hazard;
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// If this instruction is cracked into two ops by the decoder, we know that
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// it is not a branch and that it cannot issue if 3 other instructions are
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// already in the dispatch group.
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if (isCracked && NumIssued > 2)
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return Hazard;
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switch (InstrType) {
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default: assert(0 && "Unknown instruction type!");
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case PPCII::PPC970_FXU:
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@ -203,9 +210,10 @@ getHazardType(SDNode *Node) {
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}
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void PPCHazardRecognizer970::EmitInstruction(SDNode *Node) {
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bool isFirst, isSingle, isLoad, isStore;
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bool isFirst, isSingle, isCracked, isLoad, isStore;
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PPCII::PPC970_Unit InstrType =
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GetInstrType(Node->getOpcode(), isFirst, isSingle, isLoad, isStore);
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GetInstrType(Node->getOpcode(), isFirst, isSingle, isCracked,
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isLoad, isStore);
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if (InstrType == PPCII::PPC970_Pseudo) return;
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unsigned Opcode = Node->getOpcode()-ISD::BUILTIN_OP_END;
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@ -260,6 +268,11 @@ void PPCHazardRecognizer970::EmitInstruction(SDNode *Node) {
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NumIssued = 4; // Terminate a d-group.
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++NumIssued;
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// If this instruction is cracked into two ops by the decoder, remember that
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// we issued two pieces.
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if (isCracked)
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++NumIssued;
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if (NumIssued == 5)
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EndDispatchGroup();
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}
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@ -60,7 +60,7 @@ private:
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/// GetInstrType - Classify the specified powerpc opcode according to its
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/// pipeline.
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PPCII::PPC970_Unit GetInstrType(unsigned Opcode,
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bool &isFirst, bool &isSingle,
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bool &isFirst, bool &isSingle,bool &isCracked,
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bool &isLoad, bool &isStore);
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bool isLoadOfStoredAddress(unsigned LoadSize,
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