/*
* Copyright ( c ) 2016 , 2022 , Oracle and / or its affiliates . All rights reserved .
* Copyright ( c ) 2016 , 2022 SAP SE . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
* This code is free software ; you can redistribute it and / or modify it
* under the terms of the GNU General Public License version 2 only , as
* published by the Free Software Foundation .
*
* This code is distributed in the hope that it will be useful , but WITHOUT
* ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License
* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
*
* Please contact Oracle , 500 Oracle Parkway , Redwood Shores , CA 94065 USA
* or visit www . oracle . com if you need additional information or have any
* questions .
*
*/
#ifndef CPU_S390_BYTES_S390_HPP
#define CPU_S390_BYTES_S390_HPP
#include "memory/allStatic.hpp"
class Bytes: AllStatic {
public :
// Efficient reading and writing of unaligned unsigned data in
// platform-specific byte ordering.
// Use regular load and store for unaligned access.
//
// On z/Architecture, unaligned loads and stores are supported when using the
// "traditional" load (LH, L/LY, LG) and store (STH, ST/STY, STG) instructions.
// The penalty for unaligned access is just very few (two or three) ticks,
// plus another few (two or three) ticks if the access crosses a cache line boundary.
//
// In short, it makes no sense on z/Architecture to piecemeal get or put unaligned data.
static inline u2 get_native_u2(address p) { return *(u2*)p; }
static inline u4 get_native_u4(address p) { return *(u4*)p; }
static inline u8 get_native_u8(address p) { return *(u8*)p; }
static inline void put_native_u2(address p, u2 x) { *(u2*)p = x; }
static inline void put_native_u4(address p, u4 x) { *(u4*)p = x; }
static inline void put_native_u8(address p, u8 x) { *(u8*)p = x; }
// The following header contains the implementations of swap_u2, swap_u4, and swap_u8.
#include OS_CPU_HEADER(bytes)
// Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering)
static inline u2 get_Java_u2(address p) { return get_native_u2(p); }
static inline u4 get_Java_u4(address p) { return get_native_u4(p); }
static inline u8 get_Java_u8(address p) { return get_native_u8(p); }
static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, x); }
static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, x); }
static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, x); }
};
#endif // CPU_S390_BYTES_S390_HPP
Messung V0.5 in Prozent C=92 H=92 G=91
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