gcc/testsuite/gcc.dg/vect/vect-widen-mult-u16.c

   1 /* { dg-require-effective-target vect_int } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 64
   7
   8 unsigned short X[N] __attribute__ ((__aligned__(16)));
   9 unsigned short Y[N] __attribute__ ((__aligned__(16)));
  10 unsigned int result[N];
  11
  12 /* short->int widening-mult */
  13 __attribute__ ((noinline)) int
  14 foo1(int len) {
  15   int i;
  16
  17   /* Not vectorized because X[i] and Y[i] are casted to 'int'
  18      so the widening multiplication pattern is not recognized.  */
  19   for (i=0; i<len; i++) {
  20     result[i] = (unsigned int)(X[i] * Y[i]);
  21   }
  22 }
  23
  24 int main (void)
  25 {
  26   int i;
  27
  28   check_vect ();
  29
  30   for (i=0; i<N; i++) {
  31     X[i] = i;
  32     Y[i] = 64-i;
  33   }
  34
  35   foo1 (N);
  36
  37   for (i=0; i<N; i++) {
  38     if (result[i] != X[i] * Y[i])
  39       abort ();
  40   }
  41
  42   return 0;
  43 }
  44
  45 /*The induction loop is vectorized  */
  46 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 2 "vect" { xfail *-*-* } } } */
  47 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_pack_trunc } } } */
  48 /* { dg-final { cleanup-tree-dump "vect" } } */
  49