added memalign.c

.gitattributes

@@ -780,6 +780,7 @@ test/grid_search/tests.h -text
 test/grid_search/utils.c -text
 test/grid_search/utils.h -text
 test/inputfiles.test.in -text
+test/simd/memalign.c -text
 test/testStreams.py -text
 test/test_Arith.py -text
 test/test_Arithc.py -text

test/simd/memalign.c

+#include <stdio.h>
+#include <stdlib.h>
+
+int get_alignment(double *ptr)
+{
+  int64_t iptr = (int64_t) ptr;
+  int mk[4] = {64, 32, 16, 8};
+  int malign = 0;
+
+  for ( int i = 0; i < 4; ++i )
+    if ( iptr%mk[i] == 0 )
+      {
+	malign = mk[4];
+	break;
+      }
+  
+  return malign;
+}
+
+int main(void)
+{
+  int nelem = 97;
+
+  double *array = (double *) malloc(nelem*sizeof(double));
+
+  int64_t iptr = (int64_t) array;
+  int malign = get_alignment(array);
+  printf("mem alignment: %d\n", malign);
+
+  free(array);
+  
+  return 0;
+}