gcc/testsuite/gcc.dg/vect/slp-46.c

   1 /* { dg-require-effective-target vect_double } */
   2 /* { dg-additional-options "--param vect-epilogues-nomask=0" } */
   3
   4 #include "tree-vect.h"
   5
   6 double x[1024], y[1024];
   7
   8 void __attribute__((noipa)) foo()
   9 {
  10   for (int i = 0; i < 512; ++i)
  11     {
  12       x[2*i] = y[i];
  13       x[2*i+1] = y[i];
  14     }
  15 }
  16
  17 void __attribute__((noipa)) bar()
  18 {
  19   for (int i = 0; i < 512; ++i)
  20     {
  21       x[2*i] = y[2*i];
  22       x[2*i+1] = y[2*i];
  23     }
  24 }
  25
  26 void __attribute__((noipa)) baz()
  27 {
  28   for (int i = 0; i < 512; ++i)
  29     {
  30       x[2*i] = y[511-i];
  31       x[2*i+1] = y[511-i];
  32     }
  33 }
  34
  35 void __attribute__((noipa)) boo()
  36 {
  37   for (int i = 0; i < 512; ++i)
  38     {
  39       x[2*i] = y[2*(511-i)];
  40       x[2*i+1] = y[2*(511-i)];
  41     }
  42 }
  43
  44 int
  45 main ()
  46 {
  47   check_vect ();
  48
  49   for (int i = 0; i < 1024; ++i)
  50     {
  51       x[i] = 0;
  52       y[i] = i;
  53       __asm__ volatile ("");
  54     }
  55
  56   foo ();
  57 #pragma GCC novector
  58   for (int i = 0; i < 1024; ++i)
  59     if (x[i] != y[i/2])
  60       abort ();
  61
  62   for (int i = 0; i < 1024; ++i)
  63     {
  64       x[i] = 0;
  65       __asm__ volatile ("");
  66     }
  67
  68   bar ();
  69 #pragma GCC novector
  70   for (int i = 0; i < 1024; ++i)
  71     if (x[i] != y[2*(i/2)])
  72       abort ();
  73
  74   for (int i = 0; i < 1024; ++i)
  75     {
  76       x[i] = 0;
  77       __asm__ volatile ("");
  78     }
  79
  80   baz ();
  81 #pragma GCC novector
  82   for (int i = 0; i < 1024; ++i)
  83     if (x[i] != y[511 - i/2])
  84       abort ();
  85
  86   for (int i = 0; i < 1024; ++i)
  87     {
  88       x[i] = 0;
  89       __asm__ volatile ("");
  90     }
  91
  92   boo ();
  93 #pragma GCC novector
  94   for (int i = 0; i < 1024; ++i)
  95     if (x[i] != y[2*(511 - i/2)])
  96       abort ();
  97
  98   return 0;
  99 }
 100
 101 /* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 4 "vect" } } */