gcc/testsuite/gcc.dg/vect/vect-over-widen-7.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 #define D -120
  13 #endif
  14
  15 #define N 50
  16
  17 /* Both range analysis and backward propagation from the truncation show
  18    that these calculations can be done in SIGNEDNESS short.  */
  19 void __attribute__ ((noipa))
  20 f (SIGNEDNESS char *restrict a, SIGNEDNESS char *restrict b,
  21    SIGNEDNESS char *restrict c, SIGNEDNESS char d)
  22 {
  23   int promoted_d = d;
  24   for (int i = 0; i < N; ++i)
  25     /* Deliberate use of signed >>.  */
  26     a[i] = (b[i] + c[i] + promoted_d) >> 2;
  27 }
  28
  29 int
  30 main (void)
  31 {
  32   check_vect ();
  33
  34   SIGNEDNESS char a[N], b[N], c[N];
  35   for (int i = 0; i < N; ++i)
  36     {
  37       b[i] = BASE_B + i * 5;
  38       c[i] = BASE_C + i * 4;
  39       asm volatile ("" ::: "memory");
  40     }
  41   f (a, b, c, D);
  42   for (int i = 0; i < N; ++i)
  43     if (a[i] != (BASE_B + BASE_C + D + i * 9) >> 2)
  44       __builtin_abort ();
  45
  46   return 0;
  47 }
  48
  49 /* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */
  50 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */
  51 /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */
  52 /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(signed char\)} "vect" } } */
  53 /* { dg-final { scan-tree-dump-not {vector[^ ]* int} "vect" } } */
  54 /* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" } } */