Adding instruction table and basic PPC state.

Can decode a single instruction.

include/xenia/types.h

@@ -95,6 +95,9 @@ typedef XECACHEALIGN volatile void xe_aligned_void_t;
 #endif  // GNUC
 #endif  // !MIN
 
+#define XEBITMASK(a, b) (((unsigned) -1 >> (31 - (b))) & ~((1U << (a)) - 1))
+#define XESELECTBITS(value, a, b) ((value & XEBITMASK(a, b)) >> a)
+
 #define XEFAIL()                goto XECLEANUP
 #define XEEXPECT(expr)          if (!(expr)         ) { goto XECLEANUP; }
 #define XEEXPECTTRUE(expr)      if (!(expr)         ) { goto XECLEANUP; }
@@ -106,4 +109,21 @@ typedef XECACHEALIGN volatile void xe_aligned_void_t;
 #define XEIGNORE(expr)          do { (void)(expr); } while(0)
 
 
+typedef struct XECACHEALIGN {
+  union {
+    struct {
+      float     x;
+      float     y;
+      float     z;
+      float     w;
+    };
+    float       f4[4];
+    struct {
+      uint64_t  low;
+      uint64_t  high;
+    };
+  };
+} xefloat4_t;
+
+
 #endif  // XENIA_TYPES_H_