VEX/test/x87tst.c

   1
   2 #include <stdio.h>
   3 #include <math.h>
   4
   5 double d;
   6 int i;
   7
   8 extern void do_tst ( void );
   9
  10 asm(
  11 "\n"
  12 "do_tst:\n"
  13 "\txorl %eax,%eax\n"
  14 "\tfld d\n"
  15 "\tftst\n"
  16 "\tfnstsw %ax\n"
  17 "\tmovl %eax, i\n"
  18 "\tret\n"
  19 );
  20
  21 int main ( void )
  22 {
  23    d = -1.23; do_tst(); printf("%f -> 0x%x\n", d, i );
  24    d = 0.0;   do_tst(); printf("%f -> 0x%x\n", d, i );
  25    d = 9.87;  do_tst(); printf("%f -> 0x%x\n", d, i );
  26    return 0;
  27 }