Use i386 ieeefp.h

i387/bsd_ieeefp.h

@@ -1,2 +1,258 @@
-#include "cdefs-compat.h"
-#include "amd64/bsd_ieeefp.h"
+/*-
+ * 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
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_IEEEFP_H_
+#define _MACHINE_IEEEFP_H_
+
+/*
+ * Deprecated historical FPU control interface
+ *
+ * IEEE floating point type, constant and function definitions.
+ * XXX: FP*FLD and FP*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 */
+
+/*
+ * 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 */
+
+#ifdef __GNUCLIKE_ASM
+
+#define	__fldcw(addr)	__asm __volatile("fldcw %0" : : "m" (*(addr)))
+#define	__fldenv(addr)	__asm __volatile("fldenv %0" : : "m" (*(addr)))
+#define	__fnclex()	__asm __volatile("fnclex")
+#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)))
+
+/*
+ * 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);
+}
+
+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 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);
+	return (_p);
+}
+
+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 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);
+	return (_p);
+}
+
+static __inline fp_except_t
+fpgetsticky(void)
+{
+	unsigned _ex;
+	unsigned short _sw;
+
+	__fnstsw(&_sw);
+	_ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF;
+	return ((fp_except_t)_ex);
+}
+
+static __inline fp_except_t
+fpresetsticky(fp_except_t _m)
+{
+	struct {
+		unsigned _cw;
+		unsigned _sw;
+		unsigned _other[5];
+	} _env;
+	fp_except_t _p;
+
+	_m &= FP_STKY_FLD >> FP_STKY_OFF;
+	_p = fpgetsticky();
+	if ((_p & ~_m) == _p)
+		return (_p);
+	if ((_p & ~_m) == 0) {
+		__fnclex();
+		return (_p);
+	}
+	__fnstenv(&_env);
+	_env._sw &= ~_m;
+	__fldenv(&_env);
+	return (_p);
+}
+
+#endif /* __GNUCLIKE_ASM */
+
+#endif /* !_MACHINE_IEEEFP_H_ */