diff --git a/bitutil.h b/bitutil.h
index 74dcc74..7207c87 100644
--- a/bitutil.h
+++ b/bitutil.h
@@ -92,10 +92,14 @@ static inline uint64_t           zigzagdec64(uint64_t x)       { return x >> 1 ^
   #ifdef __SSE2__
 #include <emmintrin.h>
 
-#define DELTA128x32(_v_, _sv_) _mm_sub_epi32(_v_, _mm_or_si128(_mm_srli_si128(_sv_, 12), _mm_slli_si128(_v_, 4)))
+//#define DELTA128x16(_v_, _sv_) _mm_sub_epi16(_v_, _mm_or_si128(_mm_srli_si128(_sv_, 14), _mm_slli_si128(_v_, 2)))
+#define DELTA128x16(_v_, _sv_) _mm_sub_epi16(_v_, _mm_alignr_epi8(_v_, _sv_, 14))
+#define DELTA128x32(_v_, _sv_) _mm_sub_epi32(_v_, _mm_alignr_epi8(_v_, _sv_, 12))
+//#define DELTA128x32(_v_, _sv_) _mm_sub_epi32(_v_, _mm_or_si128(_mm_srli_si128(_sv_, 12), _mm_slli_si128(_v_, 4)))
 
     #ifdef __SSSE3__
 #include <tmmintrin.h>
+
 // SIMD Scan ( prefix sum ) 
 #define SCAN128x16( _v_, _sv_) {\
   _v_  = _mm_add_epi16(_v_, _mm_slli_si128(_v_, 2));\
@@ -103,16 +107,20 @@ static inline uint64_t           zigzagdec64(uint64_t x)       { return x >> 1 ^
   _sv_ = _mm_add_epi16(_mm_add_epi16(_v_, _mm_slli_si128(_v_, 8)), _mm_shuffle_epi8(_sv_, _mm_set_epi8(15,14,15,14,15,14,15,14,15,14,15,14,15,14,15,14)));\
 }
     #endif
-
 #define SCAN128x32( _v_, _sv_) _v_ = _mm_add_epi32(_v_, _mm_slli_si128(_v_, 4)); _sv_ = _mm_add_epi32(_mm_shuffle_epi32(_sv_, _MM_SHUFFLE(3, 3, 3, 3)), _mm_add_epi32(_mm_slli_si128(_v_, 8), _v_) )
+
+#define SCANI128x16(_v_, _sv_, _vi_) SCAN128x16(_v_, _sv_); _sv_ = _mm_add_epi16(_sv_, _vi_)
 #define SCANI128x32(_v_, _sv_, _vi_) SCAN128x32(_v_, _sv_); _sv_ = _mm_add_epi32(_sv_, _vi_)
 
+// Zigzad encoding
 #define   ZIGZAG128x16(_v_) _mm_xor_si128(_mm_slli_epi16(_v_,1), _mm_srai_epi16(_v_,15))
 #define   ZIGZAG128x32(_v_) _mm_xor_si128(_mm_slli_epi32(_v_,1), _mm_srai_epi32(_v_,31))
 #define UNZIGZAG128x16(_v_) _mm_xor_si128(_mm_srli_epi16(_v_,1), _mm_srai_epi16(_mm_slli_epi16(_v_,15),15) )
+//#define UNZIGZAG128x16(_v_) _mm_xor_si128(_mm_srli_epi16(_v_,1), _mm_sub_epi32(cz, _mm_and_si128(iv,c1)) )
 #define UNZIGZAG128x32(_v_) _mm_xor_si128(_mm_srli_epi32(_v_,1), _mm_srai_epi32(_mm_slli_epi32(_v_,31),31) ) //_mm_sub_epi32(cz, _mm_and_si128(iv,c1))
 
 // SIMD Horizontal OR
+#define HOR128x16(_v_,_b_) _v_ = _mm_or_si128(_v_, _mm_srli_si128(_v_, 8)); _v_ = _mm_or_si128(_v_, _mm_srli_si128(_v_, 6)); _v_ = _mm_or_si128(_v_, _mm_srli_si128(_v_, 4)); _v_ = _mm_or_si128(_v_, _mm_srli_si128(_v_, 2)); _b_ = (unsigned short)_mm_cvtsi128_si32(_v_)
 #define HOR128x32(_v_,_b_) _v_ = _mm_or_si128(_v_, _mm_srli_si128(_v_, 8)); _v_ = _mm_or_si128(_v_, _mm_srli_si128(_v_, 4)); _b_ = (unsigned)_mm_cvtsi128_si32(_v_)
   #endif