gcc/testsuite/gcc.dg/vect/vect-over-widen-11.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, with "res"
  18    being extended for the store to d[i].  */
  19 void __attribute__ ((noipa))
  20 f (SIGNEDNESS char *restrict a, SIGNEDNESS char *restrict b,
  21    SIGNEDNESS char *restrict c, int *restrict d)
  22 {
  23   for (int i = 0; i < N; ++i)
  24     {
  25       /* Deliberate use of signed >>.  */
  26       int res = b[i] + c[i];
  27       a[i] = (res + (res >> 1)) >> 2;
  28       d[i] = res;
  29     }
  30 }
  31
  32 int
  33 main (void)
  34 {
  35   check_vect ();
  36
  37   SIGNEDNESS char a[N], b[N], c[N];
  38   int d[N];
  39   for (int i = 0; i < N; ++i)
  40     {
  41       b[i] = BASE_B + i * 5;
  42       c[i] = BASE_C + i * 4;
  43       asm volatile ("" ::: "memory");
  44     }
  45   f (a, b, c, d);
  46 #pragma GCC novector
  47   for (int i = 0; i < N; ++i)
  48     {
  49       int res = BASE_B + BASE_C + i * 9;
  50       if (a[i] != ((res + (res >> 1)) >> 2))
  51         __builtin_abort ();
  52       if (d[i] != res)
  53         __builtin_abort ();
  54     }
  55
  56   return 0;
  57 }
  58
  59 /* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */
  60 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */
  61 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */
  62 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */
  63 /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(signed char\)} "vect" } } */
  64 /* { dg-final { scan-tree-dump {vector[^ ]* int} "vect" } } */
  65 /* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" } } */