[Analysis] add comment to generalize finding a scalar op from vector; NFC
llvm-svn: 342906
diff --git a/llvm/lib/Analysis/VectorUtils.cpp b/llvm/lib/Analysis/VectorUtils.cpp
index 2f4f72a..c639f36 100644
--- a/llvm/lib/Analysis/VectorUtils.cpp
+++ b/llvm/lib/Analysis/VectorUtils.cpp
@@ -280,9 +280,10 @@
}
// Extract a value from a vector add operation with a constant zero.
- Value *Val = nullptr; Constant *Con = nullptr;
- if (match(V, m_Add(m_Value(Val), m_Constant(Con))))
- if (Constant *Elt = Con->getAggregateElement(EltNo))
+ // TODO: Use getBinOpIdentity() to generalize this.
+ Value *Val; Constant *C;
+ if (match(V, m_Add(m_Value(Val), m_Constant(C))))
+ if (Constant *Elt = C->getAggregateElement(EltNo))
if (Elt->isNullValue())
return findScalarElement(Val, EltNo);