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src/os_cpu/windows_x86/vm/bytes_windows_x86.inline.hpp@f90c822e73f8 (annotated)

src/os_cpu/windows_x86/vm/bytes_windows_x86.inline.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP
aoqi@0	26	#define OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP
aoqi@0	27
aoqi@0	28	#pragma warning(disable: 4035) // Disable warning 4035: no return value
aoqi@0	29
aoqi@0	30	// Efficient swapping of data bytes from Java byte
aoqi@0	31	// ordering to native byte ordering and vice versa.
aoqi@0	32	inline u2 Bytes::swap_u2(u2 x) {
aoqi@0	33	#ifdef AMD64
aoqi@0	34	address p = (address) &x;
aoqi@0	35	return ( (u2(p[0]) << 8 ) | ( u2(p[1])) );
aoqi@0	36	#else
aoqi@0	37	__asm {
aoqi@0	38	mov ax, x
aoqi@0	39	xchg al, ah
aoqi@0	40	}
aoqi@0	41	// no return statement needed, result is already in ax
aoqi@0	42	// compiler warning C4035 disabled via warning pragma
aoqi@0	43	#endif // AMD64
aoqi@0	44	}
aoqi@0	45
aoqi@0	46	inline u4 Bytes::swap_u4(u4 x) {
aoqi@0	47	#ifdef AMD64
aoqi@0	48	address p = (address) &x;
aoqi@0	49	return ( (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | u4(p[3])) ;
aoqi@0	50	#else
aoqi@0	51	__asm {
aoqi@0	52	mov eax, x
aoqi@0	53	bswap eax
aoqi@0	54	}
aoqi@0	55	// no return statement needed, result is already in eax
aoqi@0	56	// compiler warning C4035 disabled via warning pragma
aoqi@0	57	#endif // AMD64
aoqi@0	58	}
aoqi@0	59
aoqi@0	60	#ifdef AMD64
aoqi@0	61	inline u8 Bytes::swap_u8(u8 x) {
aoqi@0	62	address p = (address) &x;
aoqi@0	63	return ( (u8(p[0]) << 56) | (u8(p[1]) << 48) | (u8(p[2]) << 40) | (u8(p[3]) << 32) |
aoqi@0	64	(u8(p[4]) << 24) | (u8(p[5]) << 16) | (u8(p[6]) << 8) | u8(p[7])) ;
aoqi@0	65	}
aoqi@0	66
aoqi@0	67	#else
aoqi@0	68	// Helper function for swap_u8
aoqi@0	69	inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
aoqi@0	70	__asm {
aoqi@0	71	mov eax, y
aoqi@0	72	mov edx, x
aoqi@0	73	bswap eax
aoqi@0	74	bswap edx
aoqi@0	75	}
aoqi@0	76	// no return statement needed, result is already in edx:eax
aoqi@0	77	// compiler warning C4035 disabled via warning pragma
aoqi@0	78	}
aoqi@0	79
aoqi@0	80	inline u8 Bytes::swap_u8(u8 x) {
aoqi@0	81	return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
aoqi@0	82	}
aoqi@0	83	#endif // AMD64
aoqi@0	84
aoqi@0	85	#pragma warning(default: 4035) // Enable warning 4035: no return value
aoqi@0	86
aoqi@0	87	#endif // OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP