Vectorize acos, asin, and atan for float.

Eigen/src/Core/arch/SSE/MathFunctions.h

@@ -75,6 +75,24 @@ Packet4f pcos<Packet4f>(const Packet4f& _x)
   return pcos_float(_x);
 }
 
+template<> EIGEN_DEFINE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS
+Packet4f pacos<Packet4f>(const Packet4f& _x)
+{
+  return pacos_float(_x);
+}
+
+template<> EIGEN_DEFINE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS
+Packet4f pasin<Packet4f>(const Packet4f& _x)
+{
+  return pasin_float(_x);
+}
+
+template<> EIGEN_DEFINE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS
+Packet4f patan<Packet4f>(const Packet4f& _x)
+{
+  return patan_float(_x);
+}
+
 // Notice that for newer processors, it is counterproductive to use Newton
 // iteration for square root. In particular, Skylake and Zen2 processors
 // have approximately doubled throughput of the _mm_sqrt_ps instruction

Eigen/src/Core/arch/SSE/PacketMath.h

@@ -139,6 +139,9 @@ struct packet_traits<float> : default_packet_traits {
     HasReciprocal = EIGEN_FAST_MATH,
     HasSin = EIGEN_FAST_MATH,
     HasCos = EIGEN_FAST_MATH,
+    HasACos = 1,
+    HasASin = 1,
+    HasATan = 1,
     HasLog = 1,
     HasLog1p = 1,
     HasExpm1 = 1,