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 } 53
