[llvm] 4784ce9 - [SLP][NFC]Check an external user before trying to address it in debug dump, NFC

[Alexey Bataev via llvm-commits]

Author: Alexey Bataev
Date: 2025-08-06T08:58:16-07:00
New Revision: 4784ce9ebcf60274985b8fe9bf4d4eb8c734ce38

URL: https://github.com/llvm/llvm-project/commit/4784ce9ebcf60274985b8fe9bf4d4eb8c734ce38
DIFF: https://github.com/llvm/llvm-project/commit/4784ce9ebcf60274985b8fe9bf4d4eb8c734ce38.diff

LOG: [SLP][NFC]Check an external user before trying to address it in debug dump, NFC

Added: 
    

Modified: 
    llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 62ab3f522bb6f..5d0e2f9518a51 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -15097,7 +15097,8 @@ InstructionCost BoUpSLP::getTreeCost(ArrayRef<Value *> VectorizedVals,
   for (ExternalUser &EU : ExternalUses) {
     LLVM_DEBUG(dbgs() << "SLP: Computing cost for external use of TreeEntry "
                       << EU.E.Idx << " in lane " << EU.Lane << "\n");
-    LLVM_DEBUG(dbgs() << "  User:" << *EU.User << "\n");
+    LLVM_DEBUG(if (EU.User) dbgs() << "  User:" << *EU.User << "\n";
+               else dbgs() << "  User: nullptr\n");
     LLVM_DEBUG(dbgs() << "  Use: " << EU.Scalar->getNameOrAsOperand() << "\n");
 
     // Uses by ephemeral values are free (because the ephemeral value will be