gcc/testsuite/gcc.dg/vect/vect-over-widen-18.c

   1 /* { dg-require-effective-target vect_int } */
   2 /* { dg-require-effective-target vect_shift } */
   3 /* { dg-require-effective-target vect_pack_trunc } */
   4 /* { dg-require-effective-target vect_unpack } */
   5
   6 #include "tree-vect.h"
   7
   8 #define N 1024
   9
  10 /* This should be treated as an over-widening pattern: we can truncate
  11    b to unsigned char after loading it and do all the computation in
  12    unsigned char.  */
  13
  14 void __attribute__ ((noipa))
  15 f (unsigned char *restrict a, unsigned short *restrict b)
  16 {
  17   for (__INTPTR_TYPE__ i = 0; i < N; ++i)
  18     {
  19       unsigned short foo = ((b[i] & 0xef) | 0x80) + (a[i] << 4);
  20       a[i] = foo;
  21     }
  22 }
  23
  24 int
  25 main (void)
  26 {
  27   check_vect ();
  28
  29   unsigned char a[N];
  30   unsigned short b[N];
  31   for (int i = 0; i < N; ++i)
  32     {
  33       a[i] = i;
  34       b[i] = i * 3;
  35       asm volatile ("" ::: "memory");
  36     }
  37   f (a, b);
  38 #pragma GCC novector
  39   for (int i = 0; i < N; ++i)
  40     if (a[i] != (unsigned char) ((((i * 3) & 0xef) | 0x80) + (i << 4)))
  41       __builtin_abort ();
  42
  43   return 0;
  44 }
  45
  46 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* &} "vect" } } */
  47 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* |} "vect" } } */
  48 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* <<} "vect" } } */
  49 /* { dg-final { scan-tree-dump {vector[^\n]*char} "vect" } } */
  50 /* { dg-final { scan-tree-dump-not {vector[^ ]* int} "vect" } } */
  51 /* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" } } */