gdb/testsuite/gdb.reverse/i387-env-reverse.c

   1 #include <stdio.h>
   2 #include <math.h>
   3 #include <stdlib.h>
   4
   5
   6 float no1,no2,no3,no4,no5,no6,no7;
   7 float result,resultd,resultld;
   8 float *float_memory;
   9 long double ldx = 88888888888888888888.88, ldy = 9999999999999999999.99;
  10 double x = 100.345, y = 25.7789;
  11 /* marks FPU stack as empty */
  12 void empty_fpu_stack()
  13 {
  14   asm ("ffree %st(1) \n\t"
  15        "ffree %st(2) \n\t"
  16        "ffree %st(3) \n\t"
  17        "ffree %st(4) \n\t"
  18        "ffree %st(5) \n\t"
  19        "ffree %st(6) \n\t"
  20        "ffree %st(7)");
  21 }
  22
  23 /* initialization of floats */
  24 void init_floats()
  25 {
  26   no1 = 10.45;
  27   no2 = 20.77;
  28   no3 = 156.89874646;
  29   no4 = 14.56;
  30   no5 = 11.11;
  31   no6 = 66.77;
  32   no7 = 88.88;
  33   float_memory = malloc(sizeof(float) * 4);
  34   *float_memory = 256.256;
  35   *(float_memory + 1) = 356.356;
  36   *(float_memory + 2) = 456.456;
  37   *(float_memory + 3) = 556.556;
  38 }
  39
  40 int main()
  41 {
  42   init_floats();
  43   empty_fpu_stack();    /* BEGIN I387-FLOAT-REVERSE */
  44
  45   asm("nop");   /* TEST ENV */
  46   asm ("fsave %0" : "=m"(*float_memory) : );
  47   asm ("frstor %0" : : "m"(*float_memory));
  48   asm ("fstsw %ax");     /* test eax register */
  49
  50   asm ("fld1");
  51   asm ("fldl2t");
  52   asm ("fldl2e");
  53   asm ("fldpi");
  54   asm ("fldlg2");
  55   asm ("fldln2");
  56   asm ("fldz");
  57   asm ("nop");
  58
  59   return 1;             /* END I387-FLOAT-REVERSE */
  60 }