mesa/main: Add function to find next higher power of two.

With gcc implementation uses __builtin_clr which counts number of
leading zeros.

Fallback implementation uses bit manipulation. First it duplicates
the highest bit to all lower bits and then adds one to get the power
of two number.

diff --git a/src/mesa/main/imports.h b/src/mesa/main/imports.h
index b01fe5b0ab98d55f551b5be93d56114c3bab58c2..81cb396b2bb8fe41443080f8915b0f11744b3e05 100644 (file)
--- a/src/mesa/main/imports.h
+++ b/src/mesa/main/imports.h
@@ -405,6 +405,52 @@ _mesa_is_pow_two(int x)
    return !(x & (x - 1));
 }
 
+/**
+ * Round given integer to next higer power of two
+ * If X is zero result is undefined.
+ *
+ * Source for the fallback implementation is
+ * Sean Eron Anderson's webpage "Bit Twiddling Hacks"
+ * http://graphics.stanford.edu/~seander/bithacks.html
+ */
+static INLINE int32_t
+_mesa_next_pow_two_32(uint32_t x)
+{
+#ifdef __GNUC__
+       return 1 << (__builtin_clz(x) ^ 31);
+#else
+       x--;
+       x |= x >> 1;
+       x |= x >> 2;
+       x |= x >> 4;
+       x |= x >> 8;
+       x |= x >> 16;
+       x++;
+       return x;
+#endif
+}
+
+static INLINE int64_t
+_mesa_next_pow_two_64(uint64_t x)
+{
+#ifdef __GNUC__
+       if (sizeof(x) == sizeof(long))
+               return 1 << (__builtin_clzl(x) ^ 63);
+       else
+               return 1 << (__builtin_clzll(x) ^ 63);
+#else
+       x--;
+       x |= x >> 1;
+       x |= x >> 2;
+       x |= x >> 4;
+       x |= x >> 8;
+       x |= x >> 16;
+       x |= x >> 32;
+       x++;
+       return x;
+#endif
+}
+
 
 /***
  *** UNCLAMPED_FLOAT_TO_UBYTE: clamp float to [0,1] and map to ubyte in [0,255]