gcc/testsuite/gcc.dg/vect/pr106081.c

   1 /* { dg-do compile } */
   2 /* { dg-additional-options "-ffast-math -fdump-tree-optimized" } */
   3 /* { dg-additional-options "-mavx2" { target x86_64-*-* i?86-*-* } } */
   4 /* { dg-require-effective-target vect_double } */
   5 /* { dg-require-effective-target vect_unpack } */
   6 /* { dg-require-effective-target vect_intdouble_cvt } */
   7 /* { dg-require-effective-target vect_perm } */
   8
   9 struct pixels
  10 {
  11   short a,b,c,d;
  12 } *pixels;
  13 struct dpixels
  14 {
  15   double a,b,c,d;
  16 };
  17
  18 double
  19 test(double *k)
  20 {
  21   struct dpixels results={};
  22   for (int u=0; u<1000*16;u++,k--)
  23     {
  24       results.a += *k*pixels[u].a;
  25       results.b += *k*pixels[u].b;
  26       results.c += *k*pixels[u].c;
  27       results.d += *k*pixels[u].d;
  28     }
  29   return results.a+results.b*2+results.c*3+results.d*4;
  30 }
  31
  32 /* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" } } */
  33 /* { dg-final { scan-tree-dump-times "VEC_PERM" 4 "optimized" { target x86_64-*-* i?86-*-* } } } */