Functions: optimize simple generated multi-functions

This implements two optimizations:
* Reduce virtual function call overhead when a non-standard virtual
  array is used as input.
* Use a lambda in `type_conversion.cc`.

In my test setup, which creates a float attribute filled with the index,
the running time drops from `4.0 ms` to `2.0 ms`.

Differential Revision: https://developer.blender.org/D14585

1 files changed, 5 insertions, 1 deletions

diff --git a/source/blender/blenkernel/intern/type_conversions.cc b/source/blender/blenkernel/intern/type_conversions.cc
index d10979eeee9..aa79199d668 100644
--- a/source/blender/blenkernel/intern/type_conversions.cc
+++ b/source/blender/blenkernel/intern/type_conversions.cc
@@ -18,7 +18,11 @@ static void add_implicit_conversion(DataTypeConversions &conversions)
   static const CPPType &to_type = CPPType::get<To>();
   static const std::string conversion_name = from_type.name() + " to " + to_type.name();
 
-  static fn::CustomMF_SI_SO<From, To> multi_function{conversion_name.c_str(), ConversionF};
+  static fn::CustomMF_SI_SO<From, To> multi_function{
+      conversion_name.c_str(),
+      /* Use lambda instead of passing #ConversionF directly, because otherwise the compiler won't
+         inline the function. */
+      [](const From &a) { return ConversionF(a); }};
   static auto convert_single_to_initialized = [](const void *src, void *dst) {
     *(To *)dst = ConversionF(*(const From *)src);
   };