/* * Written by J.T. Conklin, Apr 10, 1995 * Public domain. */ #include static const int map[] = { 1, /* round to nearest */ 3, /* round to zero */ 2, /* round to negative infinity */ 0 /* round to positive infinity */ }; int __flt_rounds(void) { int x; /* Assume that the x87 and the SSE unit agree on the rounding mode. */ __asm("fnstcw %0" : "=m" (x)); return (map[(x >> 10) & 0x03]); }