Cycles: Tweak inline policy for some functions

The goal is to make Experimental kernel closer in performance to the
official kernel, avoiding spills and such.

There should not be big impact on official kernel, own tests showed
few percent performance drop on laptop's GPU. CPU was always the
same speed on AVX, AVX2 and SSE4.1 CPUs i've been testing here.

This seems to be the last essential step before we can get rid of
Experimental kernel and enable SSS officially on GPU without causing
some major performance issues.

Surely some more tweaks are possibly required, but that we can do
for until cows go home anyway.

1 files changed, 4 insertions, 2 deletions

diff --git a/intern/cycles/kernel/kernel_shader.h b/intern/cycles/kernel/kernel_shader.h
index 63e5ace8f94..9a4d2372075 100644
--- a/intern/cycles/kernel/kernel_shader.h
+++ b/intern/cycles/kernel/kernel_shader.h
@@ -48,8 +48,10 @@ ccl_device void shader_setup_object_transforms(KernelGlobals *kg, ShaderData *sd
 }
 #endif
 
-ccl_device void shader_setup_from_ray(KernelGlobals *kg, ShaderData *sd,
-	const Intersection *isect, const Ray *ray)
+ccl_device_noinline void shader_setup_from_ray(KernelGlobals *kg,
+                                               ShaderData *sd,
+                                               const Intersection *isect,
+                                               const Ray *ray)
 {
 #ifdef __INSTANCING__
 	ccl_fetch(sd, object) = (isect->object == PRIM_NONE)? kernel_tex_fetch(__prim_object, isect->prim): isect->object;