MISched: Don't schedule regions with 0 instructions

I think this is correct, but may not necessarily be the correct fix
for the assertion I'm really trying to solve. If a scheduling region
was found that only has dbg_value instructions, the RegPressure
tracker would end up in an inconsistent state because it would skip
over any debug instructions and point to an instruction outside of the
scheduling region. It may still be possible for this to happen if
there are some real schedulable instructions between dbg_values, but I
haven't managed to break this.

The testcase is extremely sensitive and I'm not sure how to make it
more resistent to future scheduler changes that would avoid stressing
this situation.

llvm-svn: 356926

1 files changed, 6 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index 66d3a281d42..88f0630f014 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -486,13 +486,17 @@ getSchedRegions(MachineBasicBlock *MBB,
       MachineInstr &MI = *std::prev(I);
       if (isSchedBoundary(&MI, &*MBB, MF, TII))
         break;
-      if (!MI.isDebugInstr())
+      if (!MI.isDebugInstr()) {
         // MBB::size() uses instr_iterator to count. Here we need a bundle to
         // count as a single instruction.
         ++NumRegionInstrs;
+      }
     }
 
-    Regions.push_back(SchedRegion(I, RegionEnd, NumRegionInstrs));
+    // It's possible we found a scheduling region that only has debug
+    // instructions. Don't bother scheduling these.
+    if (NumRegionInstrs != 0)
+      Regions.push_back(SchedRegion(I, RegionEnd, NumRegionInstrs));
   }
 
   if (RegionsTopDown)