Cycles: Tweaks to support CUDA 8 toolkit

All the changes are mainly giving explicit tips on inlining functions,
so they match how inlining worked with previous toolkit.

This make kernel compiled by CUDA 8 render in average with same speed
as previous kernels. Some scenes are somewhat faster, some of them are
somewhat slower. But slowdown is within 1% so far.

On a positive side it allows us to enable newer generation cards on
buildbots (so GTX 10x0 will be officially supported soon).

1 files changed, 3 insertions, 3 deletions

diff --git a/intern/cycles/kernel/closure/bssrdf.h b/intern/cycles/kernel/closure/bssrdf.h
index a260ae9a31b..35c95768b69 100644
--- a/intern/cycles/kernel/closure/bssrdf.h
+++ b/intern/cycles/kernel/closure/bssrdf.h
@@ -141,7 +141,7 @@ ccl_device float bssrdf_cubic_pdf(const ShaderClosure *sc, float r)
 }
 
 /* solve 10x^2 - 20x^3 + 15x^4 - 4x^5 - xi == 0 */
-ccl_device float bssrdf_cubic_quintic_root_find(float xi)
+ccl_device_inline float bssrdf_cubic_quintic_root_find(float xi)
 {
 	/* newton-raphson iteration, usually succeeds in 2-4 iterations, except
 	 * outside 0.02 ... 0.98 where it can go up to 10, so overall performance
@@ -255,7 +255,7 @@ ccl_device float bssrdf_burley_pdf(const ShaderClosure *sc, float r)
  * Returns scaled radius, meaning the result is to be scaled up by d.
  * Since there's no closed form solution we do Newton-Raphson method to find it.
  */
-ccl_device float bssrdf_burley_root_find(float xi)
+ccl_device_inline float bssrdf_burley_root_find(float xi)
 {
 	const float tolerance = 1e-6f;
 	const int max_iteration_count = 10;
@@ -389,7 +389,7 @@ ccl_device void bssrdf_sample(const ShaderClosure *sc, float xi, float *r, float
 		bssrdf_burley_sample(sc, xi, r, h);
 }
 
-ccl_device float bssrdf_pdf(const ShaderClosure *sc, float r)
+ccl_device_inline float bssrdf_pdf(const ShaderClosure *sc, float r)
 {
 	if(sc->type == CLOSURE_BSSRDF_CUBIC_ID)
 		return bssrdf_cubic_pdf(sc, r);