init commit

dotprod.h

@@ -0,0 +1,15 @@
+/* Internal definitions for dotproduct function */
+
+struct dotprod {
+  int len; /* Number of coefficients */
+
+  /* On a MMX or SSE machine, these hold 4 copies of the coefficients,
+   * preshifted by 0,1,2,3 words to meet all possible input data
+   * alignments (see Intel ap559 on MMX dot products).
+   *
+   * SSE2 is similar, but with 8 words at a time
+   *
+   * On a non-MMX machine, only one copy is present
+   */
+  signed short *coeffs[8];
+};