hotspot/src/os_cpu/windows_x86/vm/bytes_windows_x86.inline.hpp
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Thu, 27 May 2010 19:08:38 -0700
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permissions -rw-r--r--
6941466: Oracle rebranding changes for Hotspot repositories Summary: Change all the Sun copyrights to Oracle copyright Reviewed-by: ohair
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/*
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 * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#pragma warning(disable: 4035) // Disable warning 4035: no return value
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// Efficient swapping of data bytes from Java byte
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// ordering to native byte ordering and vice versa.
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inline u2 Bytes::swap_u2(u2 x) {
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#ifdef AMD64
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  address p = (address) &x;
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  return  ( (u2(p[0]) << 8 ) | ( u2(p[1])) );
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#else
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  __asm {
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    mov ax, x
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    xchg al, ah
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  }
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  // no return statement needed, result is already in ax
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  // compiler warning C4035 disabled via warning pragma
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#endif // AMD64
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}
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inline u4 Bytes::swap_u4(u4 x) {
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#ifdef AMD64
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  address p = (address) &x;
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  return ( (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | u4(p[3])) ;
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#else
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  __asm {
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    mov eax, x
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    bswap eax
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  }
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  // no return statement needed, result is already in eax
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  // compiler warning C4035 disabled via warning pragma
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#endif // AMD64
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}
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#ifdef AMD64
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inline u8 Bytes::swap_u8(u8 x) {
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  address p = (address) &x;
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  return ( (u8(p[0]) << 56) | (u8(p[1]) << 48) | (u8(p[2]) << 40) | (u8(p[3]) << 32) |
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           (u8(p[4]) << 24) | (u8(p[5]) << 16) | (u8(p[6]) << 8)  | u8(p[7])) ;
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}
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#else
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// Helper function for swap_u8
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inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
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  __asm {
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    mov eax, y
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    mov edx, x
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    bswap eax
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    bswap edx
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  }
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  // no return statement needed, result is already in edx:eax
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  // compiler warning C4035 disabled via warning pragma
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}
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inline u8 Bytes::swap_u8(u8 x) {
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  return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
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}
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#endif // AMD64
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#pragma warning(default: 4035) // Enable warning 4035: no return value