Mon, 23 Jun 2008 14:11:12 -0700
6708714: Optimize long LShift on 32-bits x86
Summary: For small (1-3 bits) left long shifts in 32-bits VM use sets of add+addc instructions instead of shld+shl on new AMD cpus.
Reviewed-by: never
Contributed-by: shrinivas.joshi@amd.com
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1997-2004 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | // init_globals replaces C++ global objects so we can use the standard linker |
duke@435 | 26 | // to link Delta (which is at least twice as fast as using the GNU C++ linker). |
duke@435 | 27 | // Also, init.c gives explicit control over the sequence of initialization. |
duke@435 | 28 | |
duke@435 | 29 | // Programming convention: instead of using a global object (e,g, "Foo foo;"), |
duke@435 | 30 | // use "Foo* foo;", create a function init_foo() in foo.c, and add a call |
duke@435 | 31 | // to init_foo in init.cpp. |
duke@435 | 32 | |
duke@435 | 33 | jint init_globals(); // call constructors at startup (main Java thread) |
duke@435 | 34 | void vm_init_globals(); // call constructors at startup (VM thread) |
duke@435 | 35 | void exit_globals(); // call destructors before exit |
duke@435 | 36 | |
duke@435 | 37 | bool is_init_completed(); // returns true when bootstrapping has completed |
duke@435 | 38 | void set_init_completed(); // set basic init to completed |