gcc/testsuite/gcc.dg/vect/vect-over-widen-5.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 #ifndef SIGNEDNESS
   9 #define SIGNEDNESS signed
  10 #define BASE_B -128
  11 #define BASE_C -100
  12 #endif
  13
  14 #define N 50
  15
  16 /* Both range analysis and backward propagation from the truncation show
  17    that these calculations can be done in SIGNEDNESS short.  */
  18 void __attribute__ ((noipa))
  19 f (SIGNEDNESS char *restrict a, SIGNEDNESS char *restrict b,
  20    SIGNEDNESS char *restrict c)
  21 {
  22   /* Deliberate use of signed >>.  */
  23   for (int i = 0; i < N; ++i)
  24     a[i] = (b[i] + c[i]) >> 1;
  25 }
  26
  27 int
  28 main (void)
  29 {
  30   check_vect ();
  31
  32   SIGNEDNESS char a[N], b[N], c[N];
  33   for (int i = 0; i < N; ++i)
  34     {
  35       b[i] = BASE_B + i * 5;
  36       c[i] = BASE_C + i * 4;
  37       asm volatile ("" ::: "memory");
  38     }
  39   f (a, b, c);
  40 #pragma GCC novector
  41   for (int i = 0; i < N; ++i)
  42     if (a[i] != (BASE_B + BASE_C + i * 9) >> 1)
  43       __builtin_abort ();
  44
  45   return 0;
  46 }
  47
  48 /* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */
  49 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */
  50 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */
  51 /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(signed char\)} "vect" } } */
  52 /* { dg-final { scan-tree-dump-not {vector[^ ]* int} "vect" } } */
  53 /* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" } } */