From 3b8f4422894bc7622c8bb42ae62adbc24c662015 Mon Sep 17 00:00:00 2001
From: Nikita Popov <npopov@redhat.com>
Date: Wed, 17 May 2023 14:31:21 +0200
Subject: [PATCH] [InstCombine] Fix worklist management for multi-use demanded
 element fold

Add the old instruction to the worklist, so it can be DCEd in the
same iteration.
---
 llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
index f077f6f..7ffa30b 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
@@ -594,6 +594,7 @@ Instruction *InstCombinerImpl::visitExtractElementInst(ExtractElementInst &EI) {
                   SrcVec, DemandedElts, UndefElts, 0 /* Depth */,
                   true /* AllowMultipleUsers */)) {
             if (V != SrcVec) {
+              Worklist.addValue(SrcVec);
               SrcVec->replaceAllUsesWith(V);
               return &EI;
             }
-- 
2.7.4