Add special functions to Eigen: lgamma, erf, erfc.

Includes CUDA support and unit tests.

2 files changed, 26 insertions, 0 deletions

diff --git a/test/array.cpp b/test/array.cpp
index 5395721f5..9994c23c3 100644
--- a/test/array.cpp
+++ b/test/array.cpp
@@ -217,6 +217,9 @@ template<typename ArrayType> void array_real(const ArrayType& m)
   VERIFY_IS_APPROX(m1.sinh(), sinh(m1));
   VERIFY_IS_APPROX(m1.cosh(), cosh(m1));
   VERIFY_IS_APPROX(m1.tanh(), tanh(m1));
+  VERIFY_IS_APPROX(m1.lgamma(), lgamma(m1));
+  VERIFY_IS_APPROX(m1.erf(), erf(m1));
+  VERIFY_IS_APPROX(m1.erfc(), erfc(m1));
   VERIFY_IS_APPROX(m1.arg(), arg(m1));
   VERIFY_IS_APPROX(m1.round(), round(m1));
   VERIFY_IS_APPROX(m1.floor(), floor(m1));
diff --git a/test/packetmath.cpp b/test/packetmath.cpp
index b6616ac5e..304fab5de 100644
--- a/test/packetmath.cpp
+++ b/test/packetmath.cpp
@@ -351,6 +351,25 @@ template<typename Scalar> void packetmath_real()
     VERIFY_IS_EQUAL(std::exp(-std::numeric_limits<Scalar>::denorm_min()), data2[1]);
   }
 
+  {
+    data1[0] = std::numeric_limits<Scalar>::quiet_NaN();
+    packet_helper<internal::packet_traits<Scalar>::HasLGamma,Packet> h;
+    h.store(data2, internal::plgamma(h.load(data1)));
+    VERIFY(std::isnan(data2[0]));
+  }
+  {
+    data1[0] = std::numeric_limits<Scalar>::quiet_NaN();
+    packet_helper<internal::packet_traits<Scalar>::HasErf,Packet> h;
+    h.store(data2, internal::perf(h.load(data1)));
+    VERIFY(std::isnan(data2[0]));
+  }
+  {
+    data1[0] = std::numeric_limits<Scalar>::quiet_NaN();
+    packet_helper<internal::packet_traits<Scalar>::HasErfc,Packet> h;
+    h.store(data2, internal::perfc(h.load(data1)));
+    VERIFY(std::isnan(data2[0]));
+  }
+
   for (int i=0; i<size; ++i)
   {
     data1[i] = internal::random<Scalar>(0,1) * std::pow(Scalar(10), internal::random<Scalar>(-6,6));
@@ -360,6 +379,10 @@ template<typename Scalar> void packetmath_real()
     data1[internal::random<int>(0, PacketSize)] = 0;
   CHECK_CWISE1_IF(PacketTraits::HasSqrt, std::sqrt, internal::psqrt);
   CHECK_CWISE1_IF(PacketTraits::HasLog, std::log, internal::plog);
+  CHECK_CWISE1_IF(internal::packet_traits<Scalar>::HasLGamma, std::lgamma, internal::plgamma);
+  CHECK_CWISE1_IF(internal::packet_traits<Scalar>::HasErf, std::erf, internal::perf);
+  CHECK_CWISE1_IF(internal::packet_traits<Scalar>::HasErfc, std::erfc, internal::perfc);
+
   if(PacketTraits::HasLog && PacketTraits::size>=2)
   {
     data1[0] = std::numeric_limits<Scalar>::quiet_NaN();