Changeset 379

Timestamp:

03/19/10 17:59:03 (3 years ago)

Author:

ksherdy

Message:

Added high mask and comments.

Files:

• trunk/lib/sse_simd_t.h (modified) (4 diffs)

trunk/lib/sse_simd_t.h

@@ -108 +108 @@
          * followed by fw/2 0 bits. */
         static inline SIMD_type himask();
+
+        /* The himask selector in which each field is fw/2 0 bits,
+         * followed by fw/2 1 bits. */  
+        static inline SIMD_type lomask();
         
         /* Splat constant generator with compile-time constant. */
@@ -180 +184 @@
 template<> inline SIMD_type simd<128>::himask() {return _mm_set_epi32(-1,-1,0,0);}
 
+template<> inline SIMD_type simd<16>::lomask() {return _mm_set1_epi16(0x00FF);}
+
+template<> inline SIMD_type simd<32>::lomask() {return _mm_set1_epi32(0x0000FFFF);}
+
+template<> inline SIMD_type simd<64>::lomask() {return _mm_set_epi32(0,-1,0,-1);}
+
+template<> inline SIMD_type simd<128>::lomask() {return _mm_set_epi32(0,0,-1,-1);}
+
 template<> template <int n> inline SIMD_type simd<4>::constant() {return _mm_set1_epi8((n)<<4|(n));}
 
@@ -221 +233 @@
 // Shuffle 8-bit
 template <> inline SIMD_type simd<8>::shuffle(SIMD_type r, SIMD_type s) {
-  return _mm_shuffle_epi8(r,s);
+  return _mm_shuffle_epi8(r,s); // SSSE3 dependency
 }
 
@@ -468 +480 @@
   #endif
 
-  // Fall back
+  // Fall back, SSSE3 dependency
   return  simd_or (_mm_shuffle_epi8(simd_andc(r1, simd<32>::himask()), _mm_set_epi8(0,1,4,5,8,9,12,13,2,3,6,7,10,11,14,15)),
                      _mm_shuffle_epi8(simd_andc(r2, simd<32>::himask()), _mm_set_epi8(2,3,6,7,10,11,14,15,0,1,4,5,8,9,12,13)));