1 files changed, 71 insertions, 0 deletions
diff --git a/StdLib/Include/X64/machine/byte_swap.h b/StdLib/Include/X64/machine/byte_swap.h
new file mode 100644
index 0000000000..dec8a24015
--- /dev/null
+++ b/StdLib/Include/X64/machine/byte_swap.h
@@ -0,0 +1,71 @@
+/*	$NetBSD: byte_swap.h,v 1.4 2006/01/30 22:46:35 dsl Exp $	*/
+
+/*-
+ * Copyright (c) 1998 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Charles M. Hannum.
+ *
+ * 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 NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+/*
+ * Copy of the i386 version. 64 bit versions may be added later.
+ */
+
+#ifndef _AMD64_BYTE_SWAP_H_
+#define	_AMD64_BYTE_SWAP_H_
+
+#ifdef  __GNUC__
+#include <sys/types.h>
+__BEGIN_DECLS
+
+#define	__BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
+static __inline uint32_t __byte_swap_u32_variable(uint32_t);
+static __inline uint32_t
+__byte_swap_u32_variable(uint32_t x)
+{
+	__asm volatile ( "bswap %1" : "=r" (x) : "0" (x));
+	return (x);
+}
+
+#define	__BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
+static __inline uint16_t __byte_swap_u16_variable(uint16_t);
+static __inline uint16_t
+__byte_swap_u16_variable(uint16_t x)
+{
+	__asm volatile ("rorw $8, %w1" : "=r" (x) : "0" (x)); 
+	return (x);
+}
+
+__END_DECLS
+#endif
+
+#endif /* !_AMD64_BYTE_SWAP_H_ */