diff --git a/gcc/testsuite/g++.dg/vect/pr107766.cc b/gcc/testsuite/g++.dg/vect/pr107766.cc
new file mode 100644
index 0000000000000000000000000000000000000000..744bcc900b0b1f1e4de2aecf01311c1a42087ea7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/vect/pr107766.cc
@@ -0,0 +1,23 @@
+// { dg-do compile }
+// { dg-additional-options "-ffp-contract=off" }
+
+typedef double btScalar;
+struct btVector3 {
+  operator btScalar *() const;
+};
+double m_vec[2];
+struct btShapeMatrix {
+  double &operator[](int i) { return m_vec[i]; }
+};
+btScalar shape_function___1pxt1pz, shape_function__fac;
+struct btMiniSDF {
+  void shape_function_(btVector3 const &) const;
+};
+void btMiniSDF::shape_function_(btVector3 const &xi) const {
+  btShapeMatrix res;
+  btScalar _1m3y = 1.0 - 3.0 * xi[1], _1p3y = 1.0 + 3.0 * xi[1],
+           fact1m3y = shape_function__fac * _1m3y,
+           fact1p3y = shape_function__fac * _1p3y;
+  res[22] = fact1m3y * shape_function___1pxt1pz;
+  res[23] = fact1p3y * shape_function___1pxt1pz;
+}
diff --git a/gcc/tree-vect-slp-patterns.cc b/gcc/tree-vect-slp-patterns.cc
index 122d697a809dde263b414e55a406e4d261c4fe6a..93735008bd108ddca593fda68400b0d054e1cc6c 100644
--- a/gcc/tree-vect-slp-patterns.cc
+++ b/gcc/tree-vect-slp-patterns.cc
@@ -1039,7 +1039,7 @@ complex_mul_pattern::matches (complex_operation_t op,
      with -ffp-contract=fast.  */
   if (!mul0
       && (flag_fp_contract_mode == FP_CONTRACT_FAST
-	  || !FLOAT_TYPE_P (SLP_TREE_VECTYPE (l0node[0])))
+	  || !FLOAT_TYPE_P (SLP_TREE_VECTYPE (*node)))
       && vect_match_expression_p (l0node[0], PLUS_EXPR))
     {
       auto vals = SLP_TREE_CHILDREN (l0node[0]);