Cycles: SSE optimization for Voronoi cells texture

Gives 5-6% speedup for Caterpillar_PatazStudio.blend.

Reviewed By: brecht, dingto

Differential Revision: https://developer.blender.org/D419

1 files changed, 6 insertions, 8 deletions

diff --git a/intern/cycles/kernel/svm/svm_noise.h b/intern/cycles/kernel/svm/svm_noise.h
index 282ad191470..91dda8972f9 100644
--- a/intern/cycles/kernel/svm/svm_noise.h
+++ b/intern/cycles/kernel/svm/svm_noise.h
@@ -357,15 +357,13 @@ ccl_device float3 cellnoise_color(float3 p)
 	return make_float3(r, g, b);
 }
 #else
-ccl_device float3 cellnoise_color(const float3& p)
+ccl_device __m128 cellnoise_color(const __m128& p)
 {
-	__m128i v_yxz = quick_floor_sse(_mm_setr_ps(p.y, p.x, p.z, 0.0f));
-	__m128i v_xyy = shuffle<1, 0, 0, 3>(v_yxz);
-	__m128i v_zzx = shuffle<2, 2, 1, 3>(v_yxz);
-	__m128 rgb = bits_to_01_sse(hash_sse(v_xyy, v_yxz, v_zzx));
-
-	float3 result = *(float3*)&rgb;
-	return result;
+	__m128i ip = quick_floor_sse(p);
+	__m128i ip_yxz = shuffle<1, 0, 2, 3>(ip);
+	__m128i ip_xyy = shuffle<0, 1, 1, 3>(ip);
+	__m128i ip_zzx = shuffle<2, 2, 0, 3>(ip);
+	return bits_to_01_sse(hash_sse(ip_xyy, ip_yxz, ip_zzx));
 }
 #endif