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src/cpu/zero/vm/bytes_zero.hpp@c09ee209b65c (annotated)

src/cpu/zero/vm/bytes_zero.hpp

Fri, 12 Feb 2010 10:34:11 -0800

author

kvn

date

Fri, 12 Feb 2010 10:34:11 -0800

changeset 1691

c09ee209b65c

parent 1445

354d3184f6b2

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6926048: Improve Zero performance
Summary: Make Zero figure out result types in a similar way to C++ interpreter implementation.
Reviewed-by: kvn
Contributed-by: gbenson@redhat.com

never@1445	1	/*
never@1445	2	* Copyright 1997-2002 Sun Microsystems, Inc. All Rights Reserved.
never@1445	3	* Copyright 2007, 2008, 2009 Red Hat, Inc.
never@1445	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@1445	5	*
never@1445	6	* This code is free software; you can redistribute it and/or modify it
never@1445	7	* under the terms of the GNU General Public License version 2 only, as
never@1445	8	* published by the Free Software Foundation.
never@1445	9	*
never@1445	10	* This code is distributed in the hope that it will be useful, but WITHOUT
never@1445	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@1445	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
never@1445	13	* version 2 for more details (a copy is included in the LICENSE file that
never@1445	14	* accompanied this code).
never@1445	15	*
never@1445	16	* You should have received a copy of the GNU General Public License version
never@1445	17	* 2 along with this work; if not, write to the Free Software Foundation,
never@1445	18	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@1445	19	*
never@1445	20	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
never@1445	21	* CA 95054 USA or visit www.sun.com if you need additional information or
never@1445	22	* have any questions.
never@1445	23	*
never@1445	24	*/
never@1445	25
never@1445	26	typedef union unaligned {
never@1445	27	u4 u;
never@1445	28	u2 us;
never@1445	29	u8 ul;
never@1445	30	} __attribute__((packed)) unaligned;
never@1445	31
never@1445	32	class Bytes: AllStatic {
never@1445	33	public:
never@1445	34	// Returns true if the byte ordering used by Java is different
never@1445	35	// from the native byte ordering of the underlying machine.
never@1445	36	static inline bool is_Java_byte_ordering_different() {
never@1445	37	#ifdef VM_LITTLE_ENDIAN
never@1445	38	return true;
never@1445	39	#else
never@1445	40	return false;
never@1445	41	#endif
never@1445	42	}
never@1445	43
never@1445	44	// Efficient reading and writing of unaligned unsigned data in
never@1445	45	// platform-specific byte ordering.
never@1445	46	static inline u2 get_native_u2(address p){
never@1445	47	unaligned *up = (unaligned *) p;
never@1445	48	return up->us;
never@1445	49	}
never@1445	50
never@1445	51	static inline u4 get_native_u4(address p) {
never@1445	52	unaligned *up = (unaligned *) p;
never@1445	53	return up->u;
never@1445	54	}
never@1445	55
never@1445	56	static inline u8 get_native_u8(address p) {
never@1445	57	unaligned *up = (unaligned *) p;
never@1445	58	return up->ul;
never@1445	59	}
never@1445	60
never@1445	61	static inline void put_native_u2(address p, u2 x) {
never@1445	62	unaligned *up = (unaligned *) p;
never@1445	63	up->us = x;
never@1445	64	}
never@1445	65
never@1445	66	static inline void put_native_u4(address p, u4 x) {
never@1445	67	unaligned *up = (unaligned *) p;
never@1445	68	up->u = x;
never@1445	69	}
never@1445	70
never@1445	71	static inline void put_native_u8(address p, u8 x) {
never@1445	72	unaligned *up = (unaligned *) p;
never@1445	73	up->ul = x;
never@1445	74	}
never@1445	75
never@1445	76	// Efficient reading and writing of unaligned unsigned data in Java
never@1445	77	// byte ordering (i.e. big-endian ordering).
never@1445	78	#ifdef VM_LITTLE_ENDIAN
never@1445	79	// Byte-order reversal is needed
never@1445	80	static inline u2 get_Java_u2(address p) {
never@1445	81	return (u2(p[0]) << 8) |
never@1445	82	(u2(p[1]) );
never@1445	83	}
never@1445	84	static inline u4 get_Java_u4(address p) {
never@1445	85	return (u4(p[0]) << 24) |
never@1445	86	(u4(p[1]) << 16) |
never@1445	87	(u4(p[2]) << 8) |
never@1445	88	(u4(p[3]) );
never@1445	89	}
never@1445	90	static inline u8 get_Java_u8(address p) {
never@1445	91	u4 hi, lo;
never@1445	92	hi = (u4(p[0]) << 24) |
never@1445	93	(u4(p[1]) << 16) |
never@1445	94	(u4(p[2]) << 8) |
never@1445	95	(u4(p[3]) );
never@1445	96	lo = (u4(p[4]) << 24) |
never@1445	97	(u4(p[5]) << 16) |
never@1445	98	(u4(p[6]) << 8) |
never@1445	99	(u4(p[7]) );
never@1445	100	return u8(lo) | (u8(hi) << 32);
never@1445	101	}
never@1445	102
never@1445	103	static inline void put_Java_u2(address p, u2 x) {
never@1445	104	p[0] = x >> 8;
never@1445	105	p[1] = x;
never@1445	106	}
never@1445	107	static inline void put_Java_u4(address p, u4 x) {
never@1445	108	p[0] = x >> 24;
never@1445	109	p[1] = x >> 16;
never@1445	110	p[2] = x >> 8;
never@1445	111	p[3] = x;
never@1445	112	}
never@1445	113	static inline void put_Java_u8(address p, u8 x) {
never@1445	114	u4 hi, lo;
never@1445	115	lo = x;
never@1445	116	hi = x >> 32;
never@1445	117	p[0] = hi >> 24;
never@1445	118	p[1] = hi >> 16;
never@1445	119	p[2] = hi >> 8;
never@1445	120	p[3] = hi;
never@1445	121	p[4] = lo >> 24;
never@1445	122	p[5] = lo >> 16;
never@1445	123	p[6] = lo >> 8;
never@1445	124	p[7] = lo;
never@1445	125	}
never@1445	126
never@1445	127	// Efficient swapping of byte ordering
never@1445	128	static inline u2 swap_u2(u2 x);
never@1445	129	static inline u4 swap_u4(u4 x);
never@1445	130	static inline u8 swap_u8(u8 x);
never@1445	131	#else
never@1445	132	// No byte-order reversal is needed
never@1445	133	static inline u2 get_Java_u2(address p) {
never@1445	134	return get_native_u2(p);
never@1445	135	}
never@1445	136	static inline u4 get_Java_u4(address p) {
never@1445	137	return get_native_u4(p);
never@1445	138	}
never@1445	139	static inline u8 get_Java_u8(address p) {
never@1445	140	return get_native_u8(p);
never@1445	141	}
never@1445	142
never@1445	143	static inline void put_Java_u2(address p, u2 x) {
never@1445	144	put_native_u2(p, x);
never@1445	145	}
never@1445	146	static inline void put_Java_u4(address p, u4 x) {
never@1445	147	put_native_u4(p, x);
never@1445	148	}
never@1445	149	static inline void put_Java_u8(address p, u8 x) {
never@1445	150	put_native_u8(p, x);
never@1445	151	}
never@1445	152
never@1445	153	// No byte-order reversal is needed
never@1445	154	static inline u2 swap_u2(u2 x) { return x; }
never@1445	155	static inline u4 swap_u4(u4 x) { return x; }
never@1445	156	static inline u8 swap_u8(u8 x) { return x; }
never@1445	157	#endif // VM_LITTLE_ENDIAN
never@1445	158	};
never@1445	159
never@1445	160	#ifdef VM_LITTLE_ENDIAN
never@1445	161	// The following header contains the implementations of swap_u2,
never@1445	162	// swap_u4, and swap_u8
never@1445	163	#include "incls/_bytes_pd.inline.hpp.incl"
never@1445	164	#endif // VM_LITTLE_ENDIAN