gcc/testsuite/gcc.dg/vect/vect-outer-fir-lb-big-array.c

   1 /* { dg-require-effective-target vect_float } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 80
   7 #define M 128
   8 float in[N+M];
   9 float coeff[M];
  10 float out[N];
  11 float fir_out[N];
  12
  13 /* Vectorized.  Fixed misaligment in the inner-loop.  */
  14 __attribute__ ((noinline))
  15 void foo (){
  16  int i,j,k;
  17  float diff;
  18
  19  for (i = 0; i < N; i++) {
  20   out[i] = 0;
  21  }
  22
  23  for (k = 0; k < 4; k++) {
  24   for (i = 0; i < N; i++) {
  25     diff = 0;
  26     j = k;
  27
  28     do {
  29       diff += in[j+i]*coeff[j];
  30       j+=4;
  31     } while (j < M);
  32
  33     out[i] += diff;
  34   }
  35  }
  36
  37 }
  38
  39 /* Vectorized.  Changing misalignment in the inner-loop.  */
  40 __attribute__ ((noinline))
  41 void fir (){
  42   int i,j,k;
  43   float diff;
  44
  45   for (i = 0; i < N; i++) {
  46     diff = 0;
  47     for (j = 0; j < M; j++) {
  48       diff += in[j+i]*coeff[j];
  49     }
  50     fir_out[i] = diff;
  51   }
  52 }
  53
  54
  55 int main (void)
  56 {
  57   check_vect ();
  58   int i, j;
  59   float diff;
  60
  61   for (i = 0; i < M; i++)
  62     coeff[i] = i;
  63   for (i = 0; i < N+M; i++)
  64     in[i] = i;
  65
  66   foo ();
  67   fir ();
  68
  69 #pragma GCC novector
  70   for (i = 0; i < N; i++) {
  71     if (out[i] != fir_out[i])
  72       abort ();
  73   }
  74
  75   return 0;
  76 }
  77
  78 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED" 2 "vect" { xfail { vect_no_align && { ! vect_hw_misalign } } } } } */