[llvm-commits] [llvm] r80702 - /llvm/trunk/lib/CodeGen/PostRASchedulerList.cpp

[David Goodwin]

Author: david_goodwin
Date: Tue Sep  1 13:34:03 2009
New Revision: 80702

URL: http://llvm.org/viewvc/llvm-project?rev=80702&view=rev
Log:
Add hidden flags to allow binary search of post-RA scheduling errors.

Modified:
    llvm/trunk/lib/CodeGen/PostRASchedulerList.cpp

Modified: llvm/trunk/lib/CodeGen/PostRASchedulerList.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/PostRASchedulerList.cpp?rev=80702&r1=80701&r2=80702&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/PostRASchedulerList.cpp (original)
+++ llvm/trunk/lib/CodeGen/PostRASchedulerList.cpp Tue Sep  1 13:34:03 2009
@@ -56,6 +56,16 @@
                       cl::desc("Enable exact hazard avoidance"),
                       cl::init(false), cl::Hidden);
 
+// If DebugDiv > 0 then only schedule MBB with (ID % DebugDiv) == DebugMod
+static cl::opt<int>
+DebugDiv("postra-sched-debugdiv",
+                      cl::desc("Debug control MBBs that are scheduled"),
+                      cl::init(0), cl::Hidden);
+static cl::opt<int>
+DebugMod("postra-sched-debugmod",
+                      cl::desc("Debug control MBBs that are scheduled"),
+                      cl::init(0), cl::Hidden);
+
 namespace {
   class VISIBILITY_HIDDEN PostRAScheduler : public MachineFunctionPass {
   public:
@@ -212,6 +222,17 @@
   // Loop over all of the basic blocks
   for (MachineFunction::iterator MBB = Fn.begin(), MBBe = Fn.end();
        MBB != MBBe; ++MBB) {
+#ifndef NDEBUG
+    // If DebugDiv > 0 then only schedule MBB with (ID % DebugDiv) == DebugMod
+    if (DebugDiv > 0) {
+      static int bbcnt = 0;
+      if (bbcnt++ % DebugDiv != DebugMod)
+        continue;
+      errs() << "*** DEBUG scheduling " << Fn.getFunction()->getNameStr() <<
+        ":MBB ID#" << MBB->getNumber() << " ***\n";
+    }
+#endif
+
     // Initialize register live-range state for scheduling in this block.
     Scheduler.GenerateLivenessForKills = false;
     Scheduler.StartBlock(MBB);