make reassociate more careful about not leaving around dead mul's
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92370 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/Reassociate.cpp b/lib/Transforms/Scalar/Reassociate.cpp
index 8596dc7..365c9f7 100644
--- a/lib/Transforms/Scalar/Reassociate.cpp
+++ b/lib/Transforms/Scalar/Reassociate.cpp
@@ -530,7 +530,13 @@
return 0;
}
- if (Factors.size() == 1) return Factors[0].Op;
+ // If this was just a single multiply, remove the multiply and return the only
+ // remaining operand.
+ if (Factors.size() == 1) {
+ ValueRankMap.erase(BO);
+ BO->eraseFromParent();
+ return Factors[0].Op;
+ }
RewriteExprTree(BO, Factors);
return BO;