From: Sebastian Pop <sebpop@gmail.com>
Date: Sat, 27 Aug 2016 02:48:41 +0000 (+0000)
Subject: GVN-hoist: invalidate MD cache (PR29144)
X-Git-Tag: llvmorg-4.0.0-rc1~11323
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4660199a3315513aa18fc4899d39cef17beaea0c;p=platform%2Fupstream%2Fllvm.git

GVN-hoist: invalidate MD cache (PR29144)

Without invalidating the entries in the MD cache we would try to access instructions
that were removed in previous iterations of hoisting.

Differential Revision: https://reviews.llvm.org/D23927

llvm-svn: 279907
---

diff --git a/llvm/lib/Transforms/Scalar/GVNHoist.cpp b/llvm/lib/Transforms/Scalar/GVNHoist.cpp
index e287ba7..4a6e934 100644
--- a/llvm/lib/Transforms/Scalar/GVNHoist.cpp
+++ b/llvm/lib/Transforms/Scalar/GVNHoist.cpp
@@ -846,6 +846,8 @@ private:
           Repl->intersectOptionalDataWith(I);
           combineKnownMetadata(Repl, I);
           I->replaceAllUsesWith(Repl);
+          // Also invalidate the Alias Analysis cache.
+          MD->removeInstruction(I);
           I->eraseFromParent();
         }