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

   1 /* { dg-do run } */
   2 /* { dg-options "-O3" } */
   3 /* { dg-require-effective-target lp64 } */
   4 /* { dg-require-effective-target ppc_cpu_supports_hw } */
   5
   6 #define NO_WARN_X86_INTRINSICS 1
   7 #include <x86intrin.h>
   8 #include "bmi2-check.h"
   9
  10 __attribute__((noinline))
  11 unsigned long long
  12 calc_mul_u32 (unsigned volatile a, unsigned b)
  13 {
  14   unsigned long long res = 0;
  15   int i;
  16   for (i = 0; i < b; ++i)
  17     res += a;
  18
  19   return res;
  20 }
  21
  22 __attribute__((noinline))
  23 unsigned calc_mulx_u32 (unsigned x, unsigned y, unsigned *res_h)
  24 {
  25   return (unsigned) _mulx_u32 (x, y, res_h);
  26 }
  27
  28 static void
  29 bmi2_test ()
  30 {
  31   unsigned i;
  32   unsigned a = 0xce7ace0;
  33   unsigned b = 0xfacefff;
  34   unsigned res_l, res_h;
  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_l = calc_mulx_u32 (a, b, &res_h);
  43
  44     res = ((unsigned long long) res_h << 32) | res_l;
  45
  46     if (res != res_ref)
  47       abort();
  48   }
  49 }