1 /* 2 * Written by J.T. Conklin, Apr 10, 1995 3 * Public domain. 4 */ 5 6 #include <sys/cdefs.h> 7 __FBSDID("$FreeBSD$"); 8 9 #include <float.h> 10 11 static const int map[] = { 12 1, /* round to nearest */ 13 3, /* round to zero */ 14 2, /* round to negative infinity */ 15 0 /* round to positive infinity */ 16 }; 17 18 int 19 __flt_rounds(void) 20 { 21 int x; 22 23 /* Assume that the x87 and the SSE unit agree on the rounding mode. */ 24 __asm("fnstcw %0" : "=m" (x)); 25 return (map[(x >> 10) & 0x03]); 26 } 27