1*84d9c625SLionel Sambuc /* $NetBSD: fpsetround.c,v 1.7 2013/10/28 01:06:36 mrg Exp $ */ 22fe8fb19SBen Gras 32fe8fb19SBen Gras /* 42fe8fb19SBen Gras * Written by J.T. Conklin, Apr 10, 1995 52fe8fb19SBen Gras * Public domain. 62fe8fb19SBen Gras */ 72fe8fb19SBen Gras 82fe8fb19SBen Gras #include <sys/cdefs.h> 92fe8fb19SBen Gras #if defined(LIBC_SCCS) && !defined(lint) 10*84d9c625SLionel Sambuc __RCSID("$NetBSD: fpsetround.c,v 1.7 2013/10/28 01:06:36 mrg Exp $"); 112fe8fb19SBen Gras #endif /* LIBC_SCCS and not lint */ 122fe8fb19SBen Gras 132fe8fb19SBen Gras #include "namespace.h" 142fe8fb19SBen Gras 15e415d488SLionel Sambuc #include <sys/types.h> 162fe8fb19SBen Gras #include <ieeefp.h> 172fe8fb19SBen Gras 182fe8fb19SBen Gras #ifdef __weak_alias __weak_alias(fpsetround,_fpsetround)192fe8fb19SBen Gras__weak_alias(fpsetround,_fpsetround) 202fe8fb19SBen Gras #endif 212fe8fb19SBen Gras 222fe8fb19SBen Gras fp_rnd 23*84d9c625SLionel Sambuc fpsetround(fp_rnd rnd_dir) 242fe8fb19SBen Gras { 252fe8fb19SBen Gras fp_rnd old; 262fe8fb19SBen Gras fp_rnd new; 27*84d9c625SLionel Sambuc #ifdef SOFTFLOATSPARC64_FOR_GCC 28*84d9c625SLionel Sambuc extern fp_rnd _softfloat_float_rounding_mode; 29*84d9c625SLionel Sambuc #endif 302fe8fb19SBen Gras 312fe8fb19SBen Gras __asm("st %%fsr,%0" : "=m" (*&old)); 322fe8fb19SBen Gras 33*84d9c625SLionel Sambuc #ifdef SOFTFLOATSPARC64_FOR_GCC 34*84d9c625SLionel Sambuc _softfloat_float_rounding_mode = rnd_dir; 35*84d9c625SLionel Sambuc #endif 36*84d9c625SLionel Sambuc 372fe8fb19SBen Gras new = old; 382fe8fb19SBen Gras new &= ~(0x03 << 30); 392fe8fb19SBen Gras new |= ((rnd_dir & 0x03) << 30); 402fe8fb19SBen Gras 412fe8fb19SBen Gras __asm("ld %0,%%fsr" : : "m" (*&new)); 422fe8fb19SBen Gras 43e415d488SLionel Sambuc return ((uint32_t)old >> 30) & 0x03; 442fe8fb19SBen Gras } 45