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add a new -view-sched-dags option to view dags as they are sent to the scheduler.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22878 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -17,8 +17,17 @@
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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#ifndef _NDEBUG
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static cl::opt<bool>
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ViewDAGs("view-sched-dags", cl::Hidden,
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cl::desc("Pop up a window to show sched dags as they are processed"));
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#else
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static const bool ViewDAGS = 0;
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#endif
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namespace {
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class SimpleSched {
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SelectionDAG &DAG;
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@ -112,5 +121,6 @@ unsigned SimpleSched::Emit(SDOperand Op) {
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/// Pick a safe ordering and emit instructions for each target node in the
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/// graph.
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void SelectionDAGISel::ScheduleAndEmitDAG(SelectionDAG &SD) {
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if (ViewDAGs) SD.viewGraph();
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SimpleSched(SD, BB).Run();
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}
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