gcc/testsuite/gcc.dg/vect/vect-over-widen-9.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   for (int i = 0; i < N; ++i)
  23     {
  24       /* Deliberate use of signed >>.  */
  25       int res = b[i] + c[i];
  26       a[i] = (res + (res >> 1)) >> 2;
  27     }
  28 }
  29
  30 int
  31 main (void)
  32 {
  33   check_vect ();
  34
  35   SIGNEDNESS char a[N], b[N], c[N];
  36   for (int i = 0; i < N; ++i)
  37     {
  38       b[i] = BASE_B + i * 5;
  39       c[i] = BASE_C + i * 4;
  40       asm volatile ("" ::: "memory");
  41     }
  42   f (a, b, c);
  43   for (int i = 0; i < N; ++i)
  44     {
  45       int res = BASE_B + BASE_C + i * 9;
  46       if (a[i] != ((res + (res >> 1)) >> 2))
  47         __builtin_abort ();
  48     }
  49
  50   return 0;
  51 }
  52
  53 /* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */
  54 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */
  55 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */
  56 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */
  57 /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(signed char\)} "vect" } } */
  58 /* { dg-final { scan-tree-dump-not {vector[^ ]* int} "vect" } } */
  59 /* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" } } */