[llvm] [X86][ISel][FMA] Get a handle on operand nodes when negating FMA (PR #130176)

[Vineet Kumar via llvm-commits]

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@@ -55673,7 +55673,12 @@ static SDValue combineFMA(SDNode *N, SelectionDAG &DAG,
   // Do not convert the passthru input of scalar intrinsics.
   // FIXME: We could allow negations of the lower element only.
   bool NegA = invertIfNegative(A);
+    // Create a dummy use for A so that in the process of negating B or C
+    // recursively, it is not deleted.
+    HandleSDNode NegAHandle(A);
   bool NegB = invertIfNegative(B);
+    // Similar to A, get a handle on B.
+    HandleSDNode NegBHandle(B);
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vntkmr wrote:

Fixed.

https://github.com/llvm/llvm-project/pull/130176