1 /* $NetBSD: fpsetround.c,v 1.6 2013/02/15 09:25:03 martin Exp $ */ 2 3 /* 4 * Written by J.T. Conklin, Apr 10, 1995 5 * Public domain. 6 */ 7 8 #include <sys/cdefs.h> 9 #if defined(LIBC_SCCS) && !defined(lint) 10 __RCSID("$NetBSD: fpsetround.c,v 1.6 2013/02/15 09:25:03 martin Exp $"); 11 #endif /* LIBC_SCCS and not lint */ 12 13 #include "namespace.h" 14 15 #include <sys/types.h> 16 #include <ieeefp.h> 17 18 #ifdef __weak_alias 19 __weak_alias(fpsetround,_fpsetround) 20 #endif 21 22 fp_rnd 23 fpsetround(rnd_dir) 24 fp_rnd rnd_dir; 25 { 26 fp_rnd old; 27 fp_rnd new; 28 #ifdef SOFTFLOATSPARC64_FOR_GCC 29 extern fp_rnd _softfloat_float_rounding_mode; 30 #endif 31 32 __asm("st %%fsr,%0" : "=m" (*&old)); 33 34 #ifdef SOFTFLOATSPARC64_FOR_GCC 35 _softfloat_float_rounding_mode = rnd_dir; 36 #endif 37 38 new = old; 39 new &= ~(0x03 << 30); 40 new |= ((rnd_dir & 0x03) << 30); 41 42 __asm("ld %0,%%fsr" : : "m" (*&new)); 43 44 return ((uint32_t)old >> 30) & 0x03; 45 } 46