Mercurial > hg > truffle
annotate src/share/vm/opto/mathexactnode.cpp @ 12888:4a2acfb16e97
8025657: compiler/intrinsics/mathexact/ConstantTest.java fails on assert in lcm.cpp on solaris x64
Reviewed-by: kvn, twisti
| author | rbackman |
|---|---|
| date | Fri, 11 Oct 2013 12:06:14 +0200 |
| parents | c9ccd7b85f20 |
| children | 59e8ad757e19 |
| rev | line source |
|---|---|
| 12323 | 1 /* |
| 2 * Copyright (c) 2013, 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 "memory/allocation.inline.hpp" | |
| 27 #include "opto/addnode.hpp" | |
|
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28 #include "opto/cfgnode.hpp" |
| 12323 | 29 #include "opto/machnode.hpp" |
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30 #include "opto/matcher.hpp" |
| 12323 | 31 #include "opto/mathexactnode.hpp" |
| 32 #include "opto/subnode.hpp" | |
| 33 | |
| 34 MathExactNode::MathExactNode(Node* ctrl, Node* n1, Node* n2) : MultiNode(3) { | |
| 35 init_req(0, ctrl); | |
| 36 init_req(1, n1); | |
| 37 init_req(2, n2); | |
| 38 } | |
| 39 | |
|
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40 BoolNode* MathExactNode::bool_node() const { |
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41 Node* flags = flags_node(); |
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42 BoolNode* boolnode = flags->unique_out()->as_Bool(); |
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43 assert(boolnode != NULL, "must have BoolNode"); |
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44 return boolnode; |
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45 } |
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46 |
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47 IfNode* MathExactNode::if_node() const { |
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48 BoolNode* boolnode = bool_node(); |
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49 IfNode* ifnode = boolnode->unique_out()->as_If(); |
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50 assert(ifnode != NULL, "must have IfNode"); |
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51 return ifnode; |
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52 } |
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53 |
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54 Node* MathExactNode::control_node() const { |
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55 IfNode* ifnode = if_node(); |
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56 return ifnode->in(0); |
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57 } |
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58 |
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59 Node* MathExactNode::non_throwing_branch() const { |
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60 IfNode* ifnode = if_node(); |
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61 if (bool_node()->_test._test == BoolTest::overflow) { |
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62 return ifnode->proj_out(0); |
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63 } |
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64 return ifnode->proj_out(1); |
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65 } |
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66 |
| 12323 | 67 Node* AddExactINode::match(const ProjNode* proj, const Matcher* m) { |
| 68 uint ideal_reg = proj->ideal_reg(); | |
| 69 RegMask rm; | |
| 70 if (proj->_con == result_proj_node) { | |
| 71 rm = m->mathExactI_result_proj_mask(); | |
| 72 } else { | |
| 73 assert(proj->_con == flags_proj_node, "must be result or flags"); | |
| 74 assert(ideal_reg == Op_RegFlags, "sanity"); | |
| 75 rm = m->mathExactI_flags_proj_mask(); | |
| 76 } | |
| 77 return new (m->C) MachProjNode(this, proj->_con, rm, ideal_reg); | |
| 78 } | |
| 79 | |
| 80 // If the MathExactNode won't overflow we have to replace the | |
| 81 // FlagsProjNode and ProjNode that is generated by the MathExactNode | |
| 82 Node* MathExactNode::no_overflow(PhaseGVN *phase, Node* new_result) { | |
| 83 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
| 84 if (igvn) { | |
| 85 ProjNode* result = result_node(); | |
| 86 ProjNode* flags = flags_node(); | |
| 87 | |
| 88 if (result != NULL) { | |
| 89 igvn->replace_node(result, new_result); | |
| 90 } | |
| 91 | |
| 92 if (flags != NULL) { | |
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93 BoolNode* boolnode = bool_node(); |
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94 switch (boolnode->_test._test) { |
| 12323 | 95 case BoolTest::overflow: |
| 96 // if the check is for overflow - never taken | |
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97 igvn->replace_node(boolnode, phase->intcon(0)); |
| 12323 | 98 break; |
| 99 case BoolTest::no_overflow: | |
| 100 // if the check is for no overflow - always taken | |
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101 igvn->replace_node(boolnode, phase->intcon(1)); |
| 12323 | 102 break; |
| 103 default: | |
| 104 fatal("Unexpected value of BoolTest"); | |
| 105 break; | |
| 106 } | |
| 107 flags->del_req(0); | |
| 108 } | |
| 109 } | |
| 110 return new_result; | |
| 111 } | |
| 112 | |
| 113 Node *AddExactINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 114 Node *arg1 = in(1); | |
| 115 Node *arg2 = in(2); | |
| 116 | |
| 117 const Type* type1 = phase->type(arg1); | |
| 118 const Type* type2 = phase->type(arg2); | |
| 119 | |
| 120 if (type1 != Type::TOP && type1->singleton() && | |
| 121 type2 != Type::TOP && type2->singleton()) { | |
| 122 jint val1 = arg1->get_int(); | |
| 123 jint val2 = arg2->get_int(); | |
| 124 jint result = val1 + val2; | |
| 125 // Hacker's Delight 2-12 Overflow if both arguments have the opposite sign of the result | |
| 126 if ( (((val1 ^ result) & (val2 ^ result)) >= 0)) { | |
| 127 Node* con_result = ConINode::make(phase->C, result); | |
| 128 return no_overflow(phase, con_result); | |
| 129 } | |
| 130 return NULL; | |
| 131 } | |
| 132 | |
| 133 if (type1 == TypeInt::ZERO) { // (Add 0 x) == x | |
| 134 Node* add_result = new (phase->C) AddINode(arg1, arg2); | |
| 135 return no_overflow(phase, add_result); | |
| 136 } | |
| 137 | |
| 138 if (type2 == TypeInt::ZERO) { // (Add x 0) == x | |
| 139 Node* add_result = new (phase->C) AddINode(arg1, arg2); | |
| 140 return no_overflow(phase, add_result); | |
| 141 } | |
| 142 | |
| 143 if (type2->singleton()) { | |
| 144 return NULL; // no change - keep constant on the right | |
| 145 } | |
| 146 | |
| 147 if (type1->singleton()) { | |
| 148 // Make it x + Constant - move constant to the right | |
| 149 swap_edges(1, 2); | |
| 150 return this; | |
| 151 } | |
| 152 | |
| 153 if (arg2->is_Load()) { | |
| 154 return NULL; // no change - keep load on the right | |
| 155 } | |
| 156 | |
| 157 if (arg1->is_Load()) { | |
| 158 // Make it x + Load - move load to the right | |
| 159 swap_edges(1, 2); | |
| 160 return this; | |
| 161 } | |
| 162 | |
| 163 if (arg1->_idx > arg2->_idx) { | |
| 164 // Sort the edges | |
| 165 swap_edges(1, 2); | |
| 166 return this; | |
| 167 } | |
| 168 | |
| 169 return NULL; | |
| 170 } | |
| 171 |