1 files changed, 36 insertions, 12 deletions

diff --git a/volk/include/volk/volk_32f_x2_dot_prod_32f_a.h b/volk/include/volk/volk_32f_x2_dot_prod_32f_a.h
index 448b2fdc0..8753ff615 100644
--- a/volk/include/volk/volk_32f_x2_dot_prod_32f_a.h
+++ b/volk/include/volk/volk_32f_x2_dot_prod_32f_a.h
@@ -37,26 +37,47 @@ static inline void volk_32f_x2_dot_prod_32f_a_sse( float* result, const  float*
   const float* aPtr = input;
   const float* bPtr = taps;
 
-  __m128 aVal, bVal, cVal;
+  __m128 a0Val, a1Val, a2Val, a3Val;
+  __m128 b0Val, b1Val, b2Val, b3Val;
+  __m128 c0Val, c1Val, c2Val, c3Val;
 
-  __m128 dotProdVal = _mm_setzero_ps();
+  __m128 dotProdVal0 = _mm_setzero_ps();
+  __m128 dotProdVal1 = _mm_setzero_ps();
+  __m128 dotProdVal2 = _mm_setzero_ps();
+  __m128 dotProdVal3 = _mm_setzero_ps();
 
   for(;number < quarterPoints; number++){
 
-    aVal = _mm_load_ps(aPtr);
-    bVal = _mm_load_ps(bPtr);
-
-    cVal = _mm_mul_ps(aVal, bVal);
-
-    dotProdVal = _mm_add_ps(cVal, dotProdVal);
-
-    aPtr += 4;
-    bPtr += 4;
+    a0Val = _mm_load_ps(aPtr);
+    a1Val = _mm_load_ps(aPtr+4);
+    a2Val = _mm_load_ps(aPtr+8);
+    a3Val = _mm_load_ps(aPtr+12);
+    b0Val = _mm_load_ps(bPtr);
+    b1Val = _mm_load_ps(bPtr+4);
+    b2Val = _mm_load_ps(bPtr+8);
+    b3Val = _mm_load_ps(bPtr+12);
+
+    c0Val = _mm_mul_ps(a0Val, b0Val);
+    c1Val = _mm_mul_ps(a1Val, b1Val);
+    c2Val = _mm_mul_ps(a2Val, b2Val);
+    c3Val = _mm_mul_ps(a3Val, b3Val);
+
+    dotProdVal0 = _mm_add_ps(c0Val, dotProdVal0);
+    dotProdVal1 = _mm_add_ps(c1Val, dotProdVal1);
+    dotProdVal2 = _mm_add_ps(c2Val, dotProdVal2);
+    dotProdVal3 = _mm_add_ps(c3Val, dotProdVal3);
+
+    aPtr += 4*4;
+    bPtr += 4*4;
   }
 
+  dotProdVal0 = _mm_add_ps(dotProdVal0, dotProdVal1);
+  dotProdVal0 = _mm_add_ps(dotProdVal0, dotProdVal2);
+  dotProdVal0 = _mm_add_ps(dotProdVal0, dotProdVal3);
+
   __VOLK_ATTR_ALIGNED(16) float dotProductVector[4];
 
-  _mm_store_ps(dotProductVector,dotProdVal); // Store the results back into the dot product vector
+  _mm_store_ps(dotProductVector,dotProdVal0); // Store the results back into the dot product vector
 
   dotProduct = dotProductVector[0];
   dotProduct += dotProductVector[1];
@@ -66,6 +87,9 @@ static inline void volk_32f_x2_dot_prod_32f_a_sse( float* result, const  float*
   number = quarterPoints * 4;
   for(;number < num_points; number++){
     dotProduct += ((*aPtr++) * (*bPtr++));
+    dotProduct += ((*aPtr++) * (*bPtr++));
+    dotProduct += ((*aPtr++) * (*bPtr++));
+    dotProduct += ((*aPtr++) * (*bPtr++));
   }
 
   *result = dotProduct;