gcc/testsuite/gcc.target/i386/bmi2-mulx32-2.c

   1 /* { dg-do run { target { bmi2 && ia32 } } } */
   2 /* { dg-options "-mbmi2 -O2" } */
   3
   4 #include <x86intrin.h>
   5
   6 #include "bmi2-check.h"
   7
   8 __attribute__((noinline))
   9 unsigned long long
  10 calc_mul_u32 (unsigned volatile a, unsigned b)
  11 {
  12   unsigned long long res = 0;
  13   int i;
  14   for (i = 0; i < b; ++i)
  15     res += a;
  16
  17   return res;
  18 }
  19
  20 __attribute__((noinline, regparm (2)))
  21 unsigned calc_mulx_u32 (unsigned x, unsigned y, unsigned *res_h)
  22 {
  23   return (unsigned) _mulx_u32 (x, y, res_h);
  24 }
  25
  26 static void
  27 bmi2_test ()
  28 {
  29   unsigned i;
  30   unsigned a = 0xce7ace0;
  31   unsigned b = 0xfacefff;
  32   unsigned res_l, res_h;
  33   unsigned long long res, res_ref;
  34
  35   for (i = 0; i < 5; ++i) {
  36     a = a * (i + 1);
  37     b = b / (i + 1);
  38
  39     res_ref = calc_mul_u32 (a, b);
  40     res_l = calc_mulx_u32 (a, b, &res_h);
  41
  42     res = ((unsigned long long) res_h << 32) | res_l;
  43
  44     if (res != res_ref)
  45       abort();
  46   }
  47 }