gcc/testsuite/gcc.target/i386/bmi2-mulx64-1.c

   1 /* { dg-do run { target { bmi2 && { ! ia32 } } } } */
   2 /* { dg-options "-mbmi2 -O2" } */
   3
   4 #include "bmi2-check.h"
   5
   6 __attribute__((noinline))
   7 unsigned __int128
   8 calc_mul_u64 (unsigned long long volatile a, unsigned long long b)
   9 {
  10   unsigned __int128 res = 0;
  11   int i;
  12   for (i = 0; i < b; ++i)
  13     res += (unsigned __int128) a;
  14
  15   return res;
  16 }
  17
  18 static void
  19 bmi2_test ()
  20 {
  21   unsigned i;
  22   unsigned long long a = 0xce7ace0ce7ace0;
  23   unsigned long long b = 0xface;
  24   unsigned __int128 res, res_ref;
  25
  26   for (i=0; i<5; ++i) {
  27     a = a * (i + 1);
  28     b = b / (i + 1);
  29
  30     res_ref = calc_mul_u64 (a, b);
  31     res = (unsigned __int128) a * b;
  32
  33     if (res != res_ref)
  34       abort();
  35   }
  36 }