Fix cycles intersection issue with overlapping faces on windows 32 bit and CPU

without SSE3 support, due to 80 bit precision float register being used for one
bounding box but not the one next to it.

intern/cycles/kernel/kernel_sse2.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_sse2_path_trace(KernelGlobals *kg, float *buffer, unsigned int *rng_state, int sample, int x, int y, int offset, int stride)
+{
+	kernel_path_trace(kg, buffer, rng_state, sample, x, y, offset, stride);
+}
+
+/* Tonemapping */
+
+void kernel_cpu_sse2_tonemap(KernelGlobals *kg, uchar4 *rgba, float *buffer, int sample, int resolution, int x, int y, int offset, int stride)
+{
+	kernel_film_tonemap(kg, rgba, buffer, sample, resolution, x, y, offset, stride);
+}
+
+/* Shader Evaluate */
+
+void kernel_cpu_sse2_shader(KernelGlobals *kg, uint4 *input, float4 *output, int type, int i)
+{
+	kernel_shader_evaluate(kg, input, output, (ShaderEvalType)type, i);
+}
+
+CCL_NAMESPACE_END
+
+#endif
+