[llvm] ba95539 - [SCEVExpander][PowerPC]clear scev rewriter before deleting instructions.

[Chen Zheng via llvm-commits]

Author: Chen Zheng
Date: 2020-08-03T20:36:08-04:00
New Revision: ba955397ac44e5df6135469d76c645fdcac256da

URL: https://github.com/llvm/llvm-project/commit/ba955397ac44e5df6135469d76c645fdcac256da
DIFF: https://github.com/llvm/llvm-project/commit/ba955397ac44e5df6135469d76c645fdcac256da.diff

LOG: [SCEVExpander][PowerPC]clear scev rewriter before deleting instructions.

Reviewed By: lebedev.ri
Differential Revision: https://reviews.llvm.org/D85130

Added: 
    

Modified: 
    llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp b/llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
index a7546d2be5d83..0068ad7174ee7 100644
--- a/llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
+++ b/llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
@@ -606,6 +606,10 @@ bool PPCLoopInstrFormPrep::rewriteLoadStores(Loop *L, Bucket &BucketChain,
       NewBasePtr = NewPHI;
   }
 
+  // Clear the rewriter cache, because values that are in the rewriter's cache
+  // can be deleted below, causing the AssertingVH in the cache to trigger.
+  SCEVE.clear();
+
   if (Instruction *IDel = dyn_cast<Instruction>(BasePtr))
     BBChanged.insert(IDel->getParent());
   BasePtr->replaceAllUsesWith(NewBasePtr);