From 3077ca97bdd4de7e8878e2f8308b6f615b60a470 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 11 Jan 2011 08:19:16 +0000
Subject: [PATCH] update memdep when an instruction is deleted.  This code
 isn't actually reached in the testcase in PR8954, but it's safe and good
 practice.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123224 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/GVN.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp
index a4bd7c1eb42..db6ed3977d1 100644
--- a/lib/Transforms/Scalar/GVN.cpp
+++ b/lib/Transforms/Scalar/GVN.cpp
@@ -1383,8 +1383,11 @@ bool GVN::processNonLocalLoad(LoadInst *LI,
   }
 
   if (!CanDoPRE) {
-    while (!NewInsts.empty())
-      NewInsts.pop_back_val()->eraseFromParent();
+    while (!NewInsts.empty()) {
+      Instruction *I = NewInsts.pop_back_val();
+      if (MD) MD->removeInstruction(I);
+      I->eraseFromParent();
+    }
     return false;
   }