[llvm] r275935 - AMDGPU/SI: Fix SI scheduler refcount issue

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Mon Jul 18 19:35:22 2016
New Revision: 275935

URL: http://llvm.org/viewvc/llvm-project?rev=275935&view=rev
Log:
AMDGPU/SI: Fix SI scheduler refcount issue

Without this fix, releaseSuccessors when InOrOutBlock is
false could release SUs outside the schedule BasicBlock.

Patch by Axel Davy

Modified:
    llvm/trunk/lib/Target/AMDGPU/SIMachineScheduler.cpp

Modified: llvm/trunk/lib/Target/AMDGPU/SIMachineScheduler.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/SIMachineScheduler.cpp?rev=275935&r1=275934&r2=275935&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/SIMachineScheduler.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/SIMachineScheduler.cpp Mon Jul 18 19:35:22 2016
@@ -464,6 +464,9 @@ void SIScheduleBlock::releaseSuccessors(
   for (SDep& Succ : SU->Succs) {
     SUnit *SuccSU = Succ.getSUnit();
 
+    if (SuccSU->NodeNum >= DAG->SUnits.size())
+        continue;
+
     if (BC->isSUInBlock(SuccSU, ID) != InOrOutBlock)
       continue;