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

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Scalar/GVNHoist.cpp b/llvm/lib/Transforms/Scalar/GVNHoist.cpp
index e287ba71e0b..4a6e934b573 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();
         }