1/* $NetBSD: fpsetround.c,v 1.9 2024/03/20 06:15:39 rillig 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 1.9 2024/03/20 06:15:39 rillig 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#ifdef SOFTFLOATSPARC64_FOR_GCC 23extern fp_rnd _softfloat_float_rounding_mode; 24#endif 25 26fp_rnd 27fpsetround(fp_rnd rnd_dir) 28{ 29 fp_rnd old; 30 fp_rnd new; 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 &= ~(0x03U << 30); 40 new |= ((rnd_dir & 0x03U) << 30); 41 42 __asm("ld %0,%%fsr" : : "m" (*&new)); 43 44 return ((uint32_t)old >> 30) & 0x03; 45} 46