First commit

liblinear-2.49/blas/ddot.c

@@ -0,0 +1,58 @@
+#include "blas.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+double ddot_(int *n, double *sx, int *incx, double *sy, int *incy)
+{
+  long int i, m, nn, iincx, iincy;
+  double stemp;
+  long int ix, iy;
+
+  /* forms the dot product of two vectors.
+     uses unrolled loops for increments equal to one.
+     jack dongarra, linpack, 3/11/78.
+     modified 12/3/93, array(1) declarations changed to array(*) */
+
+  /* Dereference inputs */
+  nn = *n;
+  iincx = *incx;
+  iincy = *incy;
+
+  stemp = 0.0;
+  if (nn > 0)
+  {
+    if (iincx == 1 && iincy == 1) /* code for both increments equal to 1 */
+    {
+      m = nn-4;
+      for (i = 0; i < m; i += 5)
+        stemp += sx[i] * sy[i] + sx[i+1] * sy[i+1] + sx[i+2] * sy[i+2] +
+                 sx[i+3] * sy[i+3] + sx[i+4] * sy[i+4];
+
+      for ( ; i < nn; i++)        /* clean-up loop */
+        stemp += sx[i] * sy[i];
+    }
+    else /* code for unequal increments or equal increments not equal to 1 */
+    {
+      ix = 0;
+      iy = 0;
+      if (iincx < 0)
+        ix = (1 - nn) * iincx;
+      if (iincy < 0)
+        iy = (1 - nn) * iincy;
+      for (i = 0; i < nn; i++)
+      {
+        stemp += sx[ix] * sy[iy];
+        ix += iincx;
+        iy += iincy;
+      }
+    }
+  }
+
+  return stemp;
+} /* ddot_ */
+
+#ifdef __cplusplus
+}
+#endif