Apple contribution for OSX SSE and iOS NEON optimizations unit tests, thanks to Jordan Hubbard, Ian Ollmann and Hristo Hristov.

For OSX:
cd build
./premake_osx xcode4
for iOS:
cd build
./ios_build.sh
./ios_run.sh

Also integrated the branches/StackAllocation to make it easier to multi-thread collision detection in the near future. It avoids changing the btCollisionObject while performing collision detection.

As this is a large patch, some stuff might be temporarily broken, I'll keep an eye out on issues.

Test/Source/vector.h

@@ -0,0 +1,70 @@
+//
+//  vector.h
+//  BulletTest
+//
+//  Copyright (c) 2011 Apple Inc.
+//
+
+#ifndef BulletTest_vector_h
+#define BulletTest_vector_h
+
+#ifdef __SSE__
+    typedef float float4            __attribute__ ((__vector_size__(16)));
+    #include <xmmintrin.h>
+#endif
+
+#ifdef __SSE2__
+    typedef double double2          __attribute__ ((__vector_size__(16)));
+    typedef char char16             __attribute__ ((__vector_size__(16)));
+    typedef unsigned char uchar16   __attribute__ ((__vector_size__(16)));
+    typedef short short8            __attribute__ ((__vector_size__(16)));
+    typedef unsigned short ushort8  __attribute__ ((__vector_size__(16)));
+    typedef int int4                __attribute__ ((__vector_size__(16)));
+   // typedef unsigned int uint4      __attribute__ ((__vector_size__(16)));
+    #ifdef __LP64__ 
+        typedef long long2              __attribute__ ((__vector_size__(16)));
+        typedef unsigned long ulong2    __attribute__ ((__vector_size__(16)));
+    #else
+        typedef long long long2         __attribute__ ((__vector_size__(16)));
+        typedef unsigned long long ulong2 __attribute__ ((__vector_size__(16)));
+    #endif
+    #include <emmintrin.h> 
+#endif
+
+#ifdef __SSE3__
+    #include <pmmintrin.h>
+#endif
+
+#ifdef __SSSE3__
+    #include <tmmintrin.h>
+#endif
+
+#ifdef __SSE4_1__
+    #include <smmintrin.h>
+#endif
+
+#ifdef __arm__
+    #include <arm/arch.h>
+    #ifdef _ARM_ARCH_7
+        #define ARM_NEON_GCC_COMPATIBILITY  1
+        #include <arm_neon.h>
+        typedef float float4            __attribute__ ((__vector_size__(16)));
+        typedef double double2          __attribute__ ((__vector_size__(16)));
+        typedef char char16             __attribute__ ((__vector_size__(16)));
+        typedef unsigned char uchar16   __attribute__ ((__vector_size__(16)));
+        typedef short short8            __attribute__ ((__vector_size__(16)));
+        typedef unsigned short ushort8  __attribute__ ((__vector_size__(16)));
+        typedef int int4                __attribute__ ((__vector_size__(16)));
+        typedef unsigned int uint4      __attribute__ ((__vector_size__(16)));
+        #ifdef __LP64__ 
+            typedef long long2              __attribute__ ((__vector_size__(16)));
+            typedef unsigned long ulong2    __attribute__ ((__vector_size__(16)));
+        #else
+            typedef long long long2         __attribute__ ((__vector_size__(16)));
+            typedef unsigned long long ulong2 __attribute__ ((__vector_size__(16)));
+        #endif
+    #endif
+#endif
+
+
+#endif