none/tests/ppc32/mcrfs.c

   1
   2 #include <stdio.h>
   3
   4 typedef unsigned int UInt;
   5
   6 void set_fpscr ( UInt x )
   7 {
   8    UInt d[2];
   9    d[0] = 0;
  10    d[1] = x;
  11    __asm__ __volatile__(
  12       "lfd %%f0,0(%0)\n\t"
  13       "mtfsf 255,%%f0"
  14       : /*out*/
  15       : /*in*/ "b"(&d[0])
  16       : /*trash*/ "fr0", "cc", "memory"
  17    );
  18
  19 }
  20
  21 int main ( void )
  22 {
  23   int i;
  24   UInt r;
  25   for (i = 0; i < 16; i++) {
  26     set_fpscr(i);
  27     __asm__ __volatile__(
  28        "li %0,0\n\t"
  29        "mtcr %0\n\t"
  30        "mcrfs 1,7\n\t"
  31        "mfcr %0"
  32        : /*out*/ "=b"(r)
  33        : /*in*/
  34        : /*trash*/ "cc"
  35     );
  36     printf("0x%x -> 0x%08x\n", i, r);
  37   }
  38   for (i = 0; i < 16; i++) {
  39     set_fpscr(i);
  40     __asm__ __volatile__(
  41        "li %0,-1\n\t"
  42        "mtcr %0\n\t"
  43        "mcrfs 1,7\n\t"
  44        "mfcr %0"
  45        : /*out*/ "=b"(r)
  46        : /*in*/
  47        : /*trash*/ "cc"
  48     );
  49     printf("0x%x -> 0x%08x\n", i, r);
  50   }
  51   return 0;
  52 }