[SLP][NFC]Cleanup up operands of the removed insertelements, NFC.

Replace all operands of the insertelement instruction, replaced by shuffles, by poisons to avoid false-positive reports about incorrect function.
llvm · Jul 1, 2022 · 4be3fc3 · 4be3fc3
1 parent eec5d04
commit 4be3fc3
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -8827,6 +8827,8 @@ BoUpSLP::vectorizeTree(ExtraValueToDebugLocsMap &ExternallyUsedValues) {
     }
     LastInsert->replaceAllUsesWith(NewInst);
     for (InsertElementInst *IE : reverse(ShuffledInserts[I].InsertElements)) {
+      IE->replaceUsesOfWith(IE->getOperand(0),
+                            PoisonValue::get(IE->getOperand(0)->getType()));
       IE->replaceUsesOfWith(IE->getOperand(1),
                             PoisonValue::get(IE->getOperand(1)->getType()));
       eraseInstruction(IE);