gcc/testsuite/gcc.dg/vect/bb-slp-layout-20.c

   1 /* { dg-do compile } */
   2 /* { dg-additional-options "-fno-tree-loop-vectorize" } */
   3
   4 extern int a[][4], b[][4], c[][4], d[4], e[4];
   5 void f()
   6 {
   7   int t0 = a[0][3];
   8   int t1 = a[1][3];
   9   int t2 = a[2][3];
  10   int t3 = a[3][3];
  11   int a0 = 0, a1 = 0, a2 = 0, a3 = 0, b0 = 0, b1 = 0, b2 = 0, b3 = 0;
  12   for (int i = 0; i < 400; i += 4)
  13     {
  14       a0 += b[i][3] * t0;
  15       a1 += b[i][2] * t1;
  16       a2 += b[i][1] * t2;
  17       a3 += b[i][0] * t3;
  18       b0 += c[i][3] * t0;
  19       b1 += c[i][2] * t1;
  20       b2 += c[i][1] * t2;
  21       b3 += c[i][0] * t3;
  22     }
  23   d[0] = a0;
  24   d[1] = a1;
  25   d[2] = a2;
  26   d[3] = a3;
  27   e[0] = b0;
  28   e[1] = b1;
  29   e[2] = b2;
  30   e[3] = b3;
  31 }
  32
  33 /* { dg-final { scan-tree-dump-times "add new stmt: \[^\\n\\r\]* = VEC_PERM_EXPR" 3 "slp1" { target { vect_int_mult && vect_perm } } } } */