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/*- * Copyright (c) 2003 Peter Wemm. * Copyright (c) 1990 Andrew Moore, Talke Studio * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#) ieeefp.h 1.0 (Berkeley) 9/23/93 * $FreeBSD: release/9.1.0/sys/amd64/include/ieeefp.h 175231 2008-01-11 17:11:32Z bde $ */ #ifndef _MACHINE_IEEEFP_H_ #define _MACHINE_IEEEFP_H_ /* * IEEE floating point type, constant and function definitions. * XXX: {FP,SSE}*FLD and {FP,SSE}*OFF are undocumented pollution. */ #ifndef _SYS_CDEFS_H_ #error this file needs sys/cdefs.h as a prerequisite #endif /* * Rounding modes. */ typedef enum { FP_RN=0, /* round to nearest */ FP_RM, /* round down towards minus infinity */ FP_RP, /* round up towards plus infinity */ FP_RZ /* truncate */ } fp_rnd_t; /* * Precision (i.e., rounding precision) modes. */ typedef enum { FP_PS=0, /* 24 bit (single-precision) */ FP_PRS, /* reserved */ FP_PD, /* 53 bit (double-precision) */ FP_PE /* 64 bit (extended-precision) */ } fp_prec_t; #define fp_except_t int /* * Exception bit masks. */ #define FP_X_INV 0x01 /* invalid operation */ #define FP_X_DNML 0x02 /* denormal */ #define FP_X_DZ 0x04 /* zero divide */ #define FP_X_OFL 0x08 /* overflow */ #define FP_X_UFL 0x10 /* underflow */ #define FP_X_IMP 0x20 /* (im)precision */ #define FP_X_STK 0x40 /* stack fault */ /* * FPU control word bit-field masks. */ #define FP_MSKS_FLD 0x3f /* exception masks field */ #define FP_PRC_FLD 0x300 /* precision control field */ #define FP_RND_FLD 0xc00 /* rounding control field */ /* * FPU status word bit-field masks. */ #define FP_STKY_FLD 0x3f /* sticky flags field */ /* * SSE mxcsr register bit-field masks. */ #define SSE_STKY_FLD 0x3f /* exception flags */ #define SSE_DAZ_FLD 0x40 /* Denormals are zero */ #define SSE_MSKS_FLD 0x1f80 /* exception masks field */ #define SSE_RND_FLD 0x6000 /* rounding control */ #define SSE_FZ_FLD 0x8000 /* flush to zero on underflow */ /* * FPU control word bit-field offsets (shift counts). */ #define FP_MSKS_OFF 0 /* exception masks offset */ #define FP_PRC_OFF 8 /* precision control offset */ #define FP_RND_OFF 10 /* rounding control offset */ /* * FPU status word bit-field offsets (shift counts). */ #define FP_STKY_OFF 0 /* sticky flags offset */ /* * SSE mxcsr register bit-field offsets (shift counts). */ #define SSE_STKY_OFF 0 /* exception flags offset */ #define SSE_DAZ_OFF 6 /* DAZ exception mask offset */ #define SSE_MSKS_OFF 7 /* other exception masks offset */ #define SSE_RND_OFF 13 /* rounding control offset */ #define SSE_FZ_OFF 15 /* flush to zero offset */ #ifdef __GNUCLIKE_ASM #define __fldcw(addr) __asm __volatile("fldcw %0" : : "m" (*(addr))) #define __fldenv(addr) __asm __volatile("fldenv %0" : : "m" (*(addr))) #define __fnstcw(addr) __asm __volatile("fnstcw %0" : "=m" (*(addr))) #define __fnstenv(addr) __asm __volatile("fnstenv %0" : "=m" (*(addr))) #define __fnstsw(addr) __asm __volatile("fnstsw %0" : "=m" (*(addr))) #define __ldmxcsr(addr) __asm __volatile("ldmxcsr %0" : : "m" (*(addr))) #define __stmxcsr(addr) __asm __volatile("stmxcsr %0" : "=m" (*(addr))) /* * Load the control word. Be careful not to trap if there is a currently * unmasked exception (ones that will become freshly unmasked are not a * problem). This case must be handled by a save/restore of the * environment or even of the full x87 state. Accessing the environment * is very inefficient, so only do it when necessary. */ static __inline void __fnldcw(unsigned short _cw, unsigned short _newcw) { struct { unsigned _cw; unsigned _other[6]; } _env; unsigned short _sw; if ((_cw & FP_MSKS_FLD) != FP_MSKS_FLD) { __fnstsw(&_sw); if (((_sw & ~_cw) & FP_STKY_FLD) != 0) { __fnstenv(&_env); _env._cw = _newcw; __fldenv(&_env); return; } } __fldcw(&_newcw); } /* * General notes about conflicting SSE vs FP status bits. * This code assumes that software will not fiddle with the control * bits of the SSE and x87 in such a way to get them out of sync and * still expect this to work. Break this at your peril. * Because I based this on the i386 port, the x87 state is used for * the fpget*() functions, and is shadowed into the SSE state for * the fpset*() functions. For dual source fpget*() functions, I * merge the two together. I think. */ static __inline fp_rnd_t __fpgetround(void) { unsigned short _cw; __fnstcw(&_cw); return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF)); } static __inline fp_rnd_t __fpsetround(fp_rnd_t _m) { fp_rnd_t _p; unsigned _mxcsr; unsigned short _cw, _newcw; __fnstcw(&_cw); _p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF); _newcw = _cw & ~FP_RND_FLD; _newcw |= (_m << FP_RND_OFF) & FP_RND_FLD; __fnldcw(_cw, _newcw); __stmxcsr(&_mxcsr); _mxcsr &= ~SSE_RND_FLD; _mxcsr |= (_m << SSE_RND_OFF) & SSE_RND_FLD; __ldmxcsr(&_mxcsr); return (_p); } /* * Get or set the rounding precision for x87 arithmetic operations. * There is no equivalent SSE mode or control. */ static __inline fp_prec_t __fpgetprec(void) { unsigned short _cw; __fnstcw(&_cw); return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF)); } static __inline fp_prec_t __fpsetprec(fp_prec_t _m) { fp_prec_t _p; unsigned short _cw, _newcw; __fnstcw(&_cw); _p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF); _newcw = _cw & ~FP_PRC_FLD; _newcw |= (_m << FP_PRC_OFF) & FP_PRC_FLD; __fnldcw(_cw, _newcw); return (_p); } /* * Get or set the exception mask. * Note that the x87 mask bits are inverted by the API -- a mask bit of 1 * means disable for x87 and SSE, but for fp*mask() it means enable. */ static __inline fp_except_t __fpgetmask(void) { unsigned short _cw; __fnstcw(&_cw); return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF); } static __inline fp_except_t __fpsetmask(fp_except_t _m) { fp_except_t _p; unsigned _mxcsr; unsigned short _cw, _newcw; __fnstcw(&_cw); _p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF; _newcw = _cw & ~FP_MSKS_FLD; _newcw |= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD; __fnldcw(_cw, _newcw); __stmxcsr(&_mxcsr); /* XXX should we clear non-ieee SSE_DAZ_FLD and SSE_FZ_FLD ? */ _mxcsr &= ~SSE_MSKS_FLD; _mxcsr |= (~_m << SSE_MSKS_OFF) & SSE_MSKS_FLD; __ldmxcsr(&_mxcsr); return (_p); } static __inline fp_except_t __fpgetsticky(void) { unsigned _ex, _mxcsr; unsigned short _sw; __fnstsw(&_sw); _ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF; __stmxcsr(&_mxcsr); _ex |= (_mxcsr & SSE_STKY_FLD) >> SSE_STKY_OFF; return ((fp_except_t)_ex); } #endif /* __GNUCLIKE_ASM */ #if !defined(__IEEEFP_NOINLINES__) && defined(__GNUCLIKE_ASM) #define fpgetmask() __fpgetmask() #define fpgetprec() __fpgetprec() #define fpgetround() __fpgetround() #define fpgetsticky() __fpgetsticky() #define fpsetmask(m) __fpsetmask(m) #define fpsetprec(m) __fpsetprec(m) #define fpsetround(m) __fpsetround(m) /* Suppress prototypes in the MI header. */ #define _IEEEFP_INLINED_ 1 #else /* !(!__IEEEFP_NOINLINES__ && __GNUCLIKE_ASM) */ /* Augment the userland declarations. */ __BEGIN_DECLS fp_prec_t fpgetprec(void); fp_prec_t fpsetprec(fp_prec_t); __END_DECLS #endif /* !__IEEEFP_NOINLINES__ && __GNUCLIKE_ASM */ #endif /* !_MACHINE_IEEEFP_H_ */