gcc/testsuite/gcc.target/i386/bmi-bextr-4.c

   1 /* { dg-do run { target bmi } } */
   2 /* { dg-options "-O2 -mbmi -fno-inline" } */
   3
   4 #include <x86intrin.h>
   5
   6 #include "bmi-check.h"
   7
   8 unsigned calc_bextr_u32 (unsigned src1, unsigned src2)
   9 {
  10   unsigned res = 0;
  11   unsigned char start = (src2 & 0xff);
  12   unsigned char len = (int) ((src2 >> 8) & 0xff);
  13   if (start < 32) {
  14     unsigned i;
  15     unsigned last = (start+len) < 32 ? start+len : 32;
  16
  17     src1 >>= start;
  18     for (i=start; i<last; ++i) {
  19       res |= (src1 & 1) << (i-start);
  20       src1 >>= 1;
  21     }
  22   }
  23
  24   return res;
  25 }
  26
  27 static void
  28 bmi_test ()
  29 {
  30   unsigned i;
  31   unsigned char start, len;
  32   unsigned src1 = 0xfacec0ff;
  33   unsigned res, res_ref, src2;
  34
  35   for (i=0; i<5; ++i) {
  36     start = i * 4;
  37     len = i * 4;
  38
  39     src1 = src1 * 3;
  40     src2 = (start & 0xff) | ((len & 0xff) << 8);
  41
  42     res_ref = calc_bextr_u32 (src1, src2);
  43     res = _bextr_u32 (src1, start, len);
  44
  45     if (res != res_ref)
  46       abort();
  47   }
  48 }