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diff --git a/StdLib/Include/x86/ieee.h b/StdLib/Include/x86/ieee.h
new file mode 100644
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+++ b/StdLib/Include/x86/ieee.h
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+/*	$NetBSD: ieee.h,v 1.9.32.1 2007/05/07 19:49:10 pavel Exp $ */
+
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * 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, Lawrence Berkeley Laboratory.
+ *
+ * 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. 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.
+ *
+ *	@(#)ieee.h	8.1 (Berkeley) 6/11/93
+ */
+
+/*
+ * ieee.h defines the machine-dependent layout of the machine's IEEE
+ * floating point.  It does *not* define (yet?) any of the rounding
+ * mode bits, exceptions, and so forth.
+ */
+
+#include <sys/ieee754.h>
+
+#define	EXT_EXPBITS	15
+#define EXT_FRACHBITS	32
+#define	EXT_FRACLBITS	32
+#define	EXT_FRACBITS	(EXT_FRACLBITS + EXT_FRACHBITS)
+
+#define	EXT_TO_ARRAY32(u, a) do {			\
+	(a)[0] = (uint32_t)(u).extu_ext.ext_fracl;	\
+	(a)[1] = (uint32_t)(u).extu_ext.ext_frach;	\
+} while(/*CONSTCOND*/0)
+
+/*
+ * struct ieee_ext is the raw storage layout of the 80-bit
+ * extended-precision type as implemented by the FPU.  Per the
+ * respective ABI specifications, it is followed by a tail padding of
+ *
+ *   amd64: 48 bits,
+ *   i386:  16 bits.
+ */
+struct ieee_ext {
+	u_int	ext_fracl:EXT_FRACLBITS;
+	u_int	ext_frach:EXT_FRACHBITS;
+#if 0
+	u_int	ext_int:1;
+#endif
+	u_int	ext_exp:EXT_EXPBITS;
+	u_int	ext_sign:1;
+};
+
+/*
+ * Floats whose exponent is in [1..INFNAN) (of whatever type) are
+ * `normal'.  Floats whose exponent is INFNAN are either Inf or NaN.
+ * Floats whose exponent is zero are either zero (iff all fraction
+ * bits are zero) or subnormal values.
+ *
+ * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its
+ * high fraction; if the bit is set, it is a `quiet NaN'.
+ */
+#define	EXT_EXP_INFNAN	32767
+
+#if 0
+#define	SNG_QUIETNAN	(1 << 22)
+#define	DBL_QUIETNAN	(1 << 19)
+#define	EXT_QUIETNAN	(1 << 30)
+#endif
+
+/*
+ * Exponent biases.
+ */
+#define	EXT_EXP_BIAS	16383
+
+/*
+ * Convenience data structures.
+ */
+union ieee_ext_u {
+	long double		extu_ld;
+	struct ieee_ext		extu_ext;
+};