1 /* $NetBSD: flt_rounds.c,v 1.9 2015/03/19 21:22:59 joerg Exp $ */ 2 3 /* 4 * Written by J.T. Conklin, Apr 11, 1995 5 * Public domain. 6 */ 7 8 #include <sys/cdefs.h> 9 #if defined(LIBC_SCCS) && !defined(lint) 10 __RCSID("$NetBSD: flt_rounds.c,v 1.9 2015/03/19 21:22:59 joerg Exp $"); 11 #endif /* LIBC_SCCS and not lint */ 12 13 #include "namespace.h" 14 #include <machine/float.h> 15 #include <ieeefp.h> 16 17 static const int map[] = { 18 1, /* round to nearest */ 19 0, /* round to zero */ 20 2, /* round to positive infinity */ 21 3 /* round to negative infinity */ 22 }; 23 24 int 25 __flt_rounds(void) 26 { 27 #ifdef SOFTFLOAT_FOR_GCC 28 return map[fpgetround()]; 29 #else 30 int x; 31 32 __asm(".set push; .set noat; cfc1 %0,$31; .set pop" : "=r" (x)); 33 return map[x & 0x03]; 34 #endif 35 } 36