Initial implementation of igamma and igammac.
diff --git a/Eigen/src/Core/arch/CUDA/PacketMath.h b/Eigen/src/Core/arch/CUDA/PacketMath.h
index d3d9f91..d256303 100644
--- a/Eigen/src/Core/arch/CUDA/PacketMath.h
+++ b/Eigen/src/Core/arch/CUDA/PacketMath.h
@@ -43,6 +43,8 @@
     HasDiGamma = 1,
     HasErf = 1,
     HasErfc = 1,
+    HasIgamma = 1,
+    HasIGammac = 1,
 
     HasBlend = 0,
   };
@@ -67,6 +69,8 @@
     HasDiGamma = 1,
     HasErf = 1,
     HasErfc = 1,
+    HasIGamma = 1,
+    HasIGammac = 1,
 
     HasBlend = 0,
   };