spqlios basic wrapper

spqlios/lib/test/testlib/negacyclic_polynomial.cpp

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+#include "negacyclic_polynomial_impl.h"
+
+// explicit instantiation
+EXPLICIT_INSTANTIATE_POLYNOMIAL(__int128_t);
+EXPLICIT_INSTANTIATE_POLYNOMIAL(int64_t);
+EXPLICIT_INSTANTIATE_POLYNOMIAL(double);
+
+double infty_dist(const rnx_f64& a, const rnx_f64& b) {
+  const uint64_t nn = a.nn();
+  const double* aa = a.data();
+  const double* bb = b.data();
+  double res = 0.;
+  for (uint64_t i = 0; i < nn; ++i) {
+    double d = fabs(aa[i] - bb[i]);
+    if (d > res) res = d;
+  }
+  return res;
+}