gcc/testsuite/gcc.dg/tree-ssa/pr82726.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O3 --param tree-reassoc-width=4" } */
   3 /* { dg-additional-options "-mavx2" { target { x86_64-*-* i?86-*-* } } } */
   4
   5 #define N 40
   6 #define M 128
   7 unsigned int in[N+M];
   8 unsigned short out[N];
   9
  10 /* Outer-loop vectorization. */
  11
  12 void
  13 foo (){
  14   int i,j;
  15   unsigned int diff;
  16
  17   for (i = 0; i < N; i++) {
  18     diff = 0;
  19     for (j = 0; j < M; j+=8) {
  20       diff += in[j+i];
  21     }
  22     out[i]=(unsigned short)diff;
  23   }
  24
  25   return;
  26 }