1 /* 2 * Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "incls/_precompiled.incl" 26 #include "incls/_reg_split.cpp.incl" 27 28 //------------------------------Split-------------------------------------- 29 // Walk the graph in RPO and for each lrg which spills, propagate reaching 30 // definitions. During propagation, split the live range around regions of 31 // High Register Pressure (HRP). If a Def is in a region of Low Register 32 // Pressure (LRP), it will not get spilled until we encounter a region of 33 // HRP between it and one of its uses. We will spill at the transition 34 // point between LRP and HRP. Uses in the HRP region will use the spilled 35 // Def. The first Use outside the HRP region will generate a SpillCopy to 36 // hoist the live range back up into a register, and all subsequent uses 37 // will use that new Def until another HRP region is encountered. Defs in 38 // HRP regions will get trailing SpillCopies to push the LRG down into the 39 // stack immediately. 40 // 41 // As a side effect, unlink from (hence make dead) coalesced copies. 42 // 43 44 static const char out_of_nodes[] = "out of nodes during split"; 45 46 //------------------------------get_spillcopy_wide----------------------------- | 1 /* 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "libadt/vectset.hpp" 27 #include "memory/allocation.inline.hpp" 28 #include "opto/addnode.hpp" 29 #include "opto/c2compiler.hpp" 30 #include "opto/callnode.hpp" 31 #include "opto/cfgnode.hpp" 32 #include "opto/chaitin.hpp" 33 #include "opto/loopnode.hpp" 34 #include "opto/machnode.hpp" 35 36 //------------------------------Split-------------------------------------- 37 // Walk the graph in RPO and for each lrg which spills, propagate reaching 38 // definitions. During propagation, split the live range around regions of 39 // High Register Pressure (HRP). If a Def is in a region of Low Register 40 // Pressure (LRP), it will not get spilled until we encounter a region of 41 // HRP between it and one of its uses. We will spill at the transition 42 // point between LRP and HRP. Uses in the HRP region will use the spilled 43 // Def. The first Use outside the HRP region will generate a SpillCopy to 44 // hoist the live range back up into a register, and all subsequent uses 45 // will use that new Def until another HRP region is encountered. Defs in 46 // HRP regions will get trailing SpillCopies to push the LRG down into the 47 // stack immediately. 48 // 49 // As a side effect, unlink from (hence make dead) coalesced copies. 50 // 51 52 static const char out_of_nodes[] = "out of nodes during split"; 53 54 //------------------------------get_spillcopy_wide----------------------------- |