Merging r275935:

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r275935 | arsenm | 2016-07-18 17:35:22 -0700 (Mon, 18 Jul 2016) | 6 lines

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
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_39@276116 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/AMDGPU/SIMachineScheduler.cpp b/lib/Target/AMDGPU/SIMachineScheduler.cpp
index 8de1c4a51e2d47a878b2c959fbc880035a62c0ce..7125b411c603a04e72cbbc6996118a351aa89c78 100644 (file)
--- a/lib/Target/AMDGPU/SIMachineScheduler.cpp
+++ b/lib/Target/AMDGPU/SIMachineScheduler.cpp
@@ -464,6 +464,9 @@ void SIScheduleBlock::releaseSuccessors(SUnit *SU, bool InOrOutBlock) {
   for (SDep& Succ : SU->Succs) {
     SUnit *SuccSU = Succ.getSUnit();
 
+    if (SuccSU->NodeNum >= DAG->SUnits.size())
+        continue;
+
     if (BC->isSUInBlock(SuccSU, ID) != InOrOutBlock)
       continue;