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[CodeGen] TwoAddressInstructionPass: Control NumVisited limit via command line option #100125

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[CodeGen] TwoAddressInstructionPass: Control NumVisited limit via command line option #100125

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11 changes: 9 additions & 2 deletions llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,13 @@ EnableRescheduling("twoaddr-reschedule",
cl::desc("Coalesce copies by rescheduling (default=true)"),
cl::init(true), cl::Hidden);

// Limit the number of rescheduling visits to dependent instructions.
// FIXME: Arbitrary limit to reduce compile time cost.
static cl::opt<unsigned>
MaxVisits("twoaddr-reschedule-visit-limit", cl::Hidden, cl::init(10),
cl::desc("Maximum number of rescheduling visits to dependent "
"instructions (0 = no limit)"));

// Limit the number of dataflow edges to traverse when evaluating the benefit
// of commuting operands.
static cl::opt<unsigned> MaxDataFlowEdge(
Expand Down Expand Up @@ -994,7 +1001,7 @@ bool TwoAddressInstructionImpl::rescheduleMIBelowKill(
// Debug or pseudo instructions cannot be counted against the limit.
if (OtherMI.isDebugOrPseudoInstr())
continue;
if (NumVisited > 10) // FIXME: Arbitrary limit to reduce compile time cost.
if (MaxVisits && NumVisited > MaxVisits)
return false;
++NumVisited;
if (OtherMI.hasUnmodeledSideEffects() || OtherMI.isCall() ||
Expand Down Expand Up @@ -1167,7 +1174,7 @@ bool TwoAddressInstructionImpl::rescheduleKillAboveMI(
// Debug or pseudo instructions cannot be counted against the limit.
if (OtherMI.isDebugOrPseudoInstr())
continue;
if (NumVisited > 10) // FIXME: Arbitrary limit to reduce compile time cost.
if (MaxVisits && NumVisited > MaxVisits)
return false;
++NumVisited;
if (OtherMI.hasUnmodeledSideEffects() || OtherMI.isCall() ||
Expand Down
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