gcc/testsuite/gcc.target/i386/bmi2-mulx32-1.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 long long
   8 calc_mul_u32 (unsigned volatile a, unsigned b)
   9 {
  10   unsigned long long res = 0;
  11   int i;
  12   for (i = 0; i < b; ++i)
  13     res += a;
  14
  15   return res;
  16 }
  17
  18 __attribute__((noinline, regparm (2)))
  19 unsigned long long
  20 gen_mulx (unsigned a, unsigned b)
  21 {
  22   unsigned long long res;
  23
  24   res = (unsigned long long)a * b;
  25
  26   return res;
  27 }
  28
  29 static void
  30 bmi2_test ()
  31 {
  32   unsigned i;
  33   unsigned a = 0xce7ace0;
  34   unsigned b = 0xfacefff;
  35   unsigned long long res, res_ref;
  36
  37   for (i = 0; i < 5; ++i) {
  38     a = a * (i + 1);
  39     b = b / (i + 1);
  40
  41     res_ref = calc_mul_u32 (a, b);
  42     res = gen_mulx (a, b);
  43
  44     if (res != res_ref)
  45       abort();
  46   }
  47 }