[llvm] [DAG] SDPatternMatch m_Zero/m_One/m_AllOnes have inconsistent undef h… (PR #147044)

[Simon Pilgrim via llvm-commits]

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@@ -4281,7 +4281,7 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
     return V;
 
   // (A - B) - 1  ->  add (xor B, -1), A
-  if (sd_match(N, m_Sub(m_OneUse(m_Sub(m_Value(A), m_Value(B))), m_One())))
+  if (sd_match(N, m_Sub(m_OneUse(m_Sub(m_Value(A), m_Value(B))), m_One(true))))
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RKSimon wrote:

(style) `m_One(/*AllowUndefs=*/true)`

https://github.com/llvm/llvm-project/pull/147044