Fix #29259: cycles issues on certain processors. Now two versions of the kernel

are compiled, one SSE optimized and the other not, and it will choose between
them at runtime.

intern/cycles/kernel/kernel_optimized.cpp

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/* Optimized CPU kernel entry points. This file is compiled with SSE3
+   optimization flags and nearly all functions inlined, while kernel.cpp
+   is compiled without for other CPU's. */
+
+#ifdef WITH_OPTIMIZED_KERNEL
+
+#include "kernel.h"
+#include "kernel_compat_cpu.h"
+#include "kernel_math.h"
+#include "kernel_types.h"
+#include "kernel_globals.h"
+#include "kernel_film.h"
+#include "kernel_path.h"
+#include "kernel_displace.h"
+
+CCL_NAMESPACE_BEGIN
+
+/* Path Tracing */
+
+void kernel_cpu_optimized_path_trace(KernelGlobals *kg, float4 *buffer, unsigned int *rng_state, int sample, int x, int y)
+{
+	kernel_path_trace(kg, buffer, rng_state, sample, x, y);
+}
+
+/* Tonemapping */
+
+void kernel_cpu_optimized_tonemap(KernelGlobals *kg, uchar4 *rgba, float4 *buffer, int sample, int resolution, int x, int y)
+{
+	kernel_film_tonemap(kg, rgba, buffer, sample, resolution, x, y);
+}
+
+/* Displacement */
+
+void kernel_cpu_optimized_displace(KernelGlobals *kg, uint4 *input, float3 *offset, int i)
+{
+	kernel_displace(kg, input, offset, i);
+}
+
+CCL_NAMESPACE_END
+
+#endif
+