[llvm] r279907 - GVN-hoist: invalidate MD cache (PR29144)

[Sebastian Pop via llvm-commits]

Author: spop
Date: Fri Aug 26 21:48:41 2016
New Revision: 279907

URL: http://llvm.org/viewvc/llvm-project?rev=279907&view=rev
Log:
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

Modified:
    llvm/trunk/lib/Transforms/Scalar/GVNHoist.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/GVNHoist.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/GVNHoist.cpp?rev=279907&r1=279906&r2=279907&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/GVNHoist.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/GVNHoist.cpp Fri Aug 26 21:48:41 2016
@@ -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();
         }