[CGP] Fix UB when GEP is bound to trivial PHINode
Differential revision: https://reviews.llvm.org/D59140
llvm-svn: 355904
diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index af1b652..1d61d32 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -6849,6 +6849,7 @@
// to introduce PHI nodes too late to be cleaned up. If we detect such a
// trivial PHI, go ahead and zap it here.
if (Value *V = SimplifyInstruction(P, {*DL, TLInfo})) {
+ LargeOffsetGEPMap.erase(P);
P->replaceAllUsesWith(V);
P->eraseFromParent();
++NumPHIsElim;