gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u8.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 #define DOT1 43680
   9 #define DOT2 43680
  10 #define DOT3 43680
  11
  12 unsigned char X[N] __attribute__ ((__aligned__(16)));
  13 unsigned char Y[N] __attribute__ ((__aligned__(16)));
  14
  15 /* char->short->int dot product.
  16    Detected as a dot-product pattern.
  17    Should be vectorized on targets that support dot-product for unsigned chars.
  18    */
  19 unsigned int
  20 foo1(int len) {
  21   int i;
  22   unsigned int result = 0;
  23   unsigned short prod;
  24
  25   for (i=0; i<len; i++) {
  26     prod = X[i] * Y[i];
  27     result += prod;
  28   }
  29   return result;
  30 }
  31
  32 /* char->short->short dot product.
  33    Detected as a dot-product pattern.
  34    Should be vectorized on targets that support dot-product for unsigned chars.
  35    This test currently fails to vectorize on targets that support dot-product
  36    of chars only when the accumulator is int.
  37    */
  38 unsigned short
  39 foo2(int len) {
  40   int i;
  41   unsigned short result = 0;
  42
  43   for (i=0; i<len; i++) {
  44     result += (unsigned short)(X[i] * Y[i]);
  45   }
  46   return result;
  47 }
  48
  49 /* char->int->int dot product.
  50    Not detected as a dot-product.
  51    Doesn't get vectorized due to presence of type converisons.  */
  52 unsigned int
  53 foo3(int len) {
  54   int i;
  55   unsigned int result = 0;
  56
  57   for (i=0; i<len; i++) {
  58     result += (X[i] * Y[i]);
  59   }
  60   return result;
  61 }
  62
  63 int main (void)
  64 {
  65   unsigned int dot1, dot3;
  66   unsigned short dot2;
  67   int i;
  68
  69   check_vect ();
  70
  71   for (i=0; i<N; i++) {
  72     X[i] = i;
  73     Y[i] = 64-i;
  74   }
  75
  76   dot1 = foo1 (N);
  77   if (dot1 != DOT1)
  78     abort ();
  79
  80   dot2 = foo2 (N);
  81   if (dot2 != DOT2)
  82     abort ();
  83
  84   dot3 = foo3 (N);
  85   if (dot3 != DOT3)
  86     abort ();
  87
  88   return 0;
  89 }
  90
  91 /* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 2 "vect" } } */
  92
  93 /* When the vectorizer is enhanced to vectorize foo2 (accumulation into short) for
  94    targets that support accumulation into int (powerpc, ia64) we'd have:
  95 dg-final { scan-tree-dump-times "vectorized 1 loops" 2 "vect" { target vect_udot_qi } }
  96 */
  97 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 2 "vect" { xfail *-*-* } } } */
  98 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_udot_qi } } } */
  99
 100 /* { dg-final { cleanup-tree-dump "vect" } } */
 101