From d78ee54a54fc77aa139cf987870e8a194e7a2dd3 Mon Sep 17 00:00:00 2001 From: Matthias Braun Date: Thu, 17 Sep 2015 21:09:59 +0000 Subject: MachineScheduler: Provide an option for node hiding cutoff and disable it by default llvm-svn: 247942 --- llvm/lib/CodeGen/MachineScheduler.cpp | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'llvm/lib/CodeGen/MachineScheduler.cpp') diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp index 7cff5d1..bc89b134 100644 --- a/llvm/lib/CodeGen/MachineScheduler.cpp +++ b/llvm/lib/CodeGen/MachineScheduler.cpp @@ -49,6 +49,11 @@ DumpCriticalPathLength("misched-dcpl", cl::Hidden, static cl::opt ViewMISchedDAGs("view-misched-dags", cl::Hidden, cl::desc("Pop up a window to show MISched dags after they are processed")); +/// In some situations a few uninteresting nodes depend on nearly all other +/// nodes in the graph, provide a cutoff to hide them. +static cl::opt ViewMISchedCutoff("view-misched-cutoff", cl::Hidden, + cl::desc("Hide nodes with more predecessor/successor than cutoff")); + static cl::opt MISchedCutoff("misched-cutoff", cl::Hidden, cl::desc("Stop scheduling after N instructions"), cl::init(~0U)); @@ -3278,7 +3283,10 @@ struct DOTGraphTraits : public DefaultDOTGraphTraits { } static bool isNodeHidden(const SUnit *Node) { - return (Node->Preds.size() > 10 || Node->Succs.size() > 10); + if (ViewMISchedCutoff == 0) + return false; + return (Node->Preds.size() > ViewMISchedCutoff + || Node->Succs.size() > ViewMISchedCutoff); } static bool hasNodeAddressLabel(const SUnit *Node, -- cgit v1.1