jdk-sandbox: src/hotspot/os_cpu/solaris_x86/count_trailing_zeros_solaris

46437 cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	1	/*
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	2	* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	4	*
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	5	* This code is free software; you can redistribute it and/or modify it
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	6	* under the terms of the GNU General Public License version 2 only, as
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	7	* published by the Free Software Foundation.
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	8	*
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	9	* This code is distributed in the hope that it will be useful, but WITHOUT
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	12	* version 2 for more details (a copy is included in the LICENSE file that
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	13	* accompanied this code).
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	14	*
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	15	* You should have received a copy of the GNU General Public License version
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	16	* 2 along with this work; if not, write to the Free Software Foundation,
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	18	*
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	20	* or visit www.oracle.com if you need additional information or have any
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	21	* questions.
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	22	*
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	23	*/
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	24
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	25	#ifndef OS_CPU_SOLARIS_X86_VM_COUNTTRAILINGZEROS_HPP
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	26	#define OS_CPU_SOLARIS_X86_VM_COUNTTRAILINGZEROS_HPP
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	27
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	28	#include "utilities/globalDefinitions.hpp"
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	29
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	30	inline unsigned count_trailing_zeros(uintx x) {
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	31	assert(x != 0, "precondition");
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	32	uintx result;
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	33	__asm__(" rep bsfq %1, %0" : "=r" (result) : "rm" (x));
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	34	return result;
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	35	}
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	36
cda23e690843 8179004: Add an efficient implementation of the "count trailing zeros" operation kbarrett parents: diff changeset	37	#endif // include guard

author	erikj
	Fri, 05 Oct 2018 09:59:30 -0700
branch	ihse-runtestprebuilt-branch
changeset 56931	aff106ae3507
parent 47216	71c04702a3d5
child 53244	9807daeb47c4
permissions	-rw-r--r--