gcc/testsuite/gcc.dg/vect/vect-outer-fir-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 256
   8 float in[N+M];
   9 float coeff[M];
  10 float out[N];
  11 float fir_out[N];
  12
  13 /* Should be 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     for (j = k; j < M; j+=4) {
  27       diff += in[j+i]*coeff[j];
  28     }
  29     out[i] += diff;
  30   }
  31  }
  32
  33 }
  34
  35 /* Vectorized.  Changing misalignment in the inner-loop.  */
  36 __attribute__ ((noinline))
  37 void fir (){
  38   int i,j,k;
  39   float diff;
  40
  41   for (i = 0; i < N; i++) {
  42     diff = 0;
  43     for (j = 0; j < M; j++) {
  44       diff += in[j+i]*coeff[j];
  45     }
  46     fir_out[i] = diff;
  47   }
  48 }
  49
  50
  51 int main (void)
  52 {
  53   check_vect ();
  54   int i, j;
  55   float diff;
  56
  57   for (i = 0; i < M; i++)
  58     coeff[i] = i;
  59   for (i = 0; i < N+M; i++)
  60     in[i] = i;
  61
  62   foo ();
  63   fir ();
  64
  65   for (i = 0; i < N; i++) {
  66     if (out[i] != fir_out[i])
  67       abort ();
  68   }
  69
  70   return 0;
  71 }
  72
  73 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED" 2 "vect" { xfail { vect_no_align && { ! vect_hw_misalign } } } } } */