Mercurial > hg > truffle
annotate src/share/vm/opto/addnode.cpp @ 400:cc80376deb0c
6667595: Set probability FAIR for pre-, post- loops and ALWAYS for main loop
Summary: Fix loop's probability. Add optimizations to avoid spilling. Change InlineSmallCode to product flag.
Reviewed-by: never
| author | kvn |
|---|---|
| date | Thu, 02 Oct 2008 08:37:44 -0700 |
| parents | 2b73d212b1fd |
| children | 660978a2a31a |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // Portions of code courtesy of Clifford Click | |
| 26 | |
| 27 #include "incls/_precompiled.incl" | |
| 28 #include "incls/_addnode.cpp.incl" | |
| 29 | |
| 30 #define MAXFLOAT ((float)3.40282346638528860e+38) | |
| 31 | |
| 32 // Classic Add functionality. This covers all the usual 'add' behaviors for | |
| 33 // an algebraic ring. Add-integer, add-float, add-double, and binary-or are | |
| 34 // all inherited from this class. The various identity values are supplied | |
| 35 // by virtual functions. | |
| 36 | |
| 37 | |
| 38 //============================================================================= | |
| 39 //------------------------------hash------------------------------------------- | |
| 40 // Hash function over AddNodes. Needs to be commutative; i.e., I swap | |
| 41 // (commute) inputs to AddNodes willy-nilly so the hash function must return | |
| 42 // the same value in the presence of edge swapping. | |
| 43 uint AddNode::hash() const { | |
| 44 return (uintptr_t)in(1) + (uintptr_t)in(2) + Opcode(); | |
| 45 } | |
| 46 | |
| 47 //------------------------------Identity--------------------------------------- | |
| 48 // If either input is a constant 0, return the other input. | |
| 49 Node *AddNode::Identity( PhaseTransform *phase ) { | |
| 50 const Type *zero = add_id(); // The additive identity | |
| 51 if( phase->type( in(1) )->higher_equal( zero ) ) return in(2); | |
| 52 if( phase->type( in(2) )->higher_equal( zero ) ) return in(1); | |
| 53 return this; | |
| 54 } | |
| 55 | |
| 56 //------------------------------commute---------------------------------------- | |
| 57 // Commute operands to move loads and constants to the right. | |
| 58 static bool commute( Node *add, int con_left, int con_right ) { | |
| 59 Node *in1 = add->in(1); | |
| 60 Node *in2 = add->in(2); | |
| 61 | |
| 62 // Convert "1+x" into "x+1". | |
| 63 // Right is a constant; leave it | |
| 64 if( con_right ) return false; | |
| 65 // Left is a constant; move it right. | |
| 66 if( con_left ) { | |
| 67 add->swap_edges(1, 2); | |
| 68 return true; | |
| 69 } | |
| 70 | |
| 71 // Convert "Load+x" into "x+Load". | |
| 72 // Now check for loads | |
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73 if (in2->is_Load()) { |
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74 if (!in1->is_Load()) { |
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75 // already x+Load to return |
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76 return false; |
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77 } |
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78 // both are loads, so fall through to sort inputs by idx |
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79 } else if( in1->is_Load() ) { |
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80 // Left is a Load and Right is not; move it right. |
| 0 | 81 add->swap_edges(1, 2); |
| 82 return true; | |
| 83 } | |
| 84 | |
| 85 PhiNode *phi; | |
| 86 // Check for tight loop increments: Loop-phi of Add of loop-phi | |
| 87 if( in1->is_Phi() && (phi = in1->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add) | |
| 88 return false; | |
| 89 if( in2->is_Phi() && (phi = in2->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add){ | |
| 90 add->swap_edges(1, 2); | |
| 91 return true; | |
| 92 } | |
| 93 | |
| 94 // Otherwise, sort inputs (commutativity) to help value numbering. | |
| 95 if( in1->_idx > in2->_idx ) { | |
| 96 add->swap_edges(1, 2); | |
| 97 return true; | |
| 98 } | |
| 99 return false; | |
| 100 } | |
| 101 | |
| 102 //------------------------------Idealize--------------------------------------- | |
| 103 // If we get here, we assume we are associative! | |
| 104 Node *AddNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 105 const Type *t1 = phase->type( in(1) ); | |
| 106 const Type *t2 = phase->type( in(2) ); | |
| 107 int con_left = t1->singleton(); | |
| 108 int con_right = t2->singleton(); | |
| 109 | |
| 110 // Check for commutative operation desired | |
| 111 if( commute(this,con_left,con_right) ) return this; | |
| 112 | |
| 113 AddNode *progress = NULL; // Progress flag | |
| 114 | |
| 115 // Convert "(x+1)+2" into "x+(1+2)". If the right input is a | |
| 116 // constant, and the left input is an add of a constant, flatten the | |
| 117 // expression tree. | |
| 118 Node *add1 = in(1); | |
| 119 Node *add2 = in(2); | |
| 120 int add1_op = add1->Opcode(); | |
| 121 int this_op = Opcode(); | |
| 122 if( con_right && t2 != Type::TOP && // Right input is a constant? | |
| 123 add1_op == this_op ) { // Left input is an Add? | |
| 124 | |
| 125 // Type of left _in right input | |
| 126 const Type *t12 = phase->type( add1->in(2) ); | |
| 127 if( t12->singleton() && t12 != Type::TOP ) { // Left input is an add of a constant? | |
| 128 // Check for rare case of closed data cycle which can happen inside | |
| 129 // unreachable loops. In these cases the computation is undefined. | |
| 130 #ifdef ASSERT | |
| 131 Node *add11 = add1->in(1); | |
| 132 int add11_op = add11->Opcode(); | |
| 133 if( (add1 == add1->in(1)) | |
| 134 || (add11_op == this_op && add11->in(1) == add1) ) { | |
| 135 assert(false, "dead loop in AddNode::Ideal"); | |
| 136 } | |
| 137 #endif | |
| 138 // The Add of the flattened expression | |
| 139 Node *x1 = add1->in(1); | |
| 140 Node *x2 = phase->makecon( add1->as_Add()->add_ring( t2, t12 )); | |
| 141 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
| 142 if( igvn ) { | |
| 143 set_req_X(2,x2,igvn); | |
| 144 set_req_X(1,x1,igvn); | |
| 145 } else { | |
| 146 set_req(2,x2); | |
| 147 set_req(1,x1); | |
| 148 } | |
| 149 progress = this; // Made progress | |
| 150 add1 = in(1); | |
| 151 add1_op = add1->Opcode(); | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 // Convert "(x+1)+y" into "(x+y)+1". Push constants down the expression tree. | |
| 156 if( add1_op == this_op && !con_right ) { | |
| 157 Node *a12 = add1->in(2); | |
| 158 const Type *t12 = phase->type( a12 ); | |
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159 if( t12->singleton() && t12 != Type::TOP && (add1 != add1->in(1)) && |
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160 !(add1->in(1)->is_Phi() && add1->in(1)->as_Phi()->is_tripcount()) ) { |
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161 assert(add1->in(1) != this, "dead loop in AddNode::Ideal"); |
| 0 | 162 add2 = add1->clone(); |
| 163 add2->set_req(2, in(2)); | |
| 164 add2 = phase->transform(add2); | |
| 165 set_req(1, add2); | |
| 166 set_req(2, a12); | |
| 167 progress = this; | |
| 168 add2 = a12; | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 // Convert "x+(y+1)" into "(x+y)+1". Push constants down the expression tree. | |
| 173 int add2_op = add2->Opcode(); | |
| 174 if( add2_op == this_op && !con_left ) { | |
| 175 Node *a22 = add2->in(2); | |
| 176 const Type *t22 = phase->type( a22 ); | |
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177 if( t22->singleton() && t22 != Type::TOP && (add2 != add2->in(1)) && |
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178 !(add2->in(1)->is_Phi() && add2->in(1)->as_Phi()->is_tripcount()) ) { |
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179 assert(add2->in(1) != this, "dead loop in AddNode::Ideal"); |
| 0 | 180 Node *addx = add2->clone(); |
| 181 addx->set_req(1, in(1)); | |
| 182 addx->set_req(2, add2->in(1)); | |
| 183 addx = phase->transform(addx); | |
| 184 set_req(1, addx); | |
| 185 set_req(2, a22); | |
| 186 progress = this; | |
| 187 } | |
| 188 } | |
| 189 | |
| 190 return progress; | |
| 191 } | |
| 192 | |
| 193 //------------------------------Value----------------------------------------- | |
| 194 // An add node sums it's two _in. If one input is an RSD, we must mixin | |
| 195 // the other input's symbols. | |
| 196 const Type *AddNode::Value( PhaseTransform *phase ) const { | |
| 197 // Either input is TOP ==> the result is TOP | |
| 198 const Type *t1 = phase->type( in(1) ); | |
| 199 const Type *t2 = phase->type( in(2) ); | |
| 200 if( t1 == Type::TOP ) return Type::TOP; | |
| 201 if( t2 == Type::TOP ) return Type::TOP; | |
| 202 | |
| 203 // Either input is BOTTOM ==> the result is the local BOTTOM | |
| 204 const Type *bot = bottom_type(); | |
| 205 if( (t1 == bot) || (t2 == bot) || | |
| 206 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
| 207 return bot; | |
| 208 | |
| 209 // Check for an addition involving the additive identity | |
| 210 const Type *tadd = add_of_identity( t1, t2 ); | |
| 211 if( tadd ) return tadd; | |
| 212 | |
| 213 return add_ring(t1,t2); // Local flavor of type addition | |
| 214 } | |
| 215 | |
| 216 //------------------------------add_identity----------------------------------- | |
| 217 // Check for addition of the identity | |
| 218 const Type *AddNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
| 219 const Type *zero = add_id(); // The additive identity | |
| 220 if( t1->higher_equal( zero ) ) return t2; | |
| 221 if( t2->higher_equal( zero ) ) return t1; | |
| 222 | |
| 223 return NULL; | |
| 224 } | |
| 225 | |
| 226 | |
| 227 //============================================================================= | |
| 228 //------------------------------Idealize--------------------------------------- | |
| 229 Node *AddINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
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230 Node* in1 = in(1); |
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231 Node* in2 = in(2); |
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232 int op1 = in1->Opcode(); |
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233 int op2 = in2->Opcode(); |
| 0 | 234 // Fold (con1-x)+con2 into (con1+con2)-x |
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235 if ( op1 == Op_AddI && op2 == Op_SubI ) { |
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236 // Swap edges to try optimizations below |
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237 in1 = in2; |
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238 in2 = in(1); |
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239 op1 = op2; |
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240 op2 = in2->Opcode(); |
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241 } |
| 0 | 242 if( op1 == Op_SubI ) { |
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243 const Type *t_sub1 = phase->type( in1->in(1) ); |
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244 const Type *t_2 = phase->type( in2 ); |
| 0 | 245 if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP ) |
| 246 return new (phase->C, 3) SubINode(phase->makecon( add_ring( t_sub1, t_2 ) ), | |
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247 in1->in(2) ); |
| 0 | 248 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)" |
| 249 if( op2 == Op_SubI ) { | |
| 250 // Check for dead cycle: d = (a-b)+(c-d) | |
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251 assert( in1->in(2) != this && in2->in(2) != this, |
| 0 | 252 "dead loop in AddINode::Ideal" ); |
| 253 Node *sub = new (phase->C, 3) SubINode(NULL, NULL); | |
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254 sub->init_req(1, phase->transform(new (phase->C, 3) AddINode(in1->in(1), in2->in(1) ) )); |
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255 sub->init_req(2, phase->transform(new (phase->C, 3) AddINode(in1->in(2), in2->in(2) ) )); |
| 0 | 256 return sub; |
| 257 } | |
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258 // Convert "(a-b)+(b+c)" into "(a+c)" |
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259 if( op2 == Op_AddI && in1->in(2) == in2->in(1) ) { |
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260 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddINode::Ideal"); |
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261 return new (phase->C, 3) AddINode(in1->in(1), in2->in(2)); |
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262 } |
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263 // Convert "(a-b)+(c+b)" into "(a+c)" |
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264 if( op2 == Op_AddI && in1->in(2) == in2->in(2) ) { |
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265 assert(in1->in(1) != this && in2->in(1) != this,"dead loop in AddINode::Ideal"); |
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266 return new (phase->C, 3) AddINode(in1->in(1), in2->in(1)); |
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267 } |
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268 // Convert "(a-b)+(b-c)" into "(a-c)" |
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269 if( op2 == Op_SubI && in1->in(2) == in2->in(1) ) { |
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270 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddINode::Ideal"); |
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271 return new (phase->C, 3) SubINode(in1->in(1), in2->in(2)); |
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272 } |
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273 // Convert "(a-b)+(c-a)" into "(c-b)" |
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274 if( op2 == Op_SubI && in1->in(1) == in2->in(2) ) { |
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275 assert(in1->in(2) != this && in2->in(1) != this,"dead loop in AddINode::Ideal"); |
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276 return new (phase->C, 3) SubINode(in2->in(1), in1->in(2)); |
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277 } |
| 0 | 278 } |
| 279 | |
| 280 // Convert "x+(0-y)" into "(x-y)" | |
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281 if( op2 == Op_SubI && phase->type(in2->in(1)) == TypeInt::ZERO ) |
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282 return new (phase->C, 3) SubINode(in1, in2->in(2) ); |
| 0 | 283 |
| 284 // Convert "(0-y)+x" into "(x-y)" | |
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285 if( op1 == Op_SubI && phase->type(in1->in(1)) == TypeInt::ZERO ) |
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286 return new (phase->C, 3) SubINode( in2, in1->in(2) ); |
| 0 | 287 |
| 288 // Convert (x>>>z)+y into (x+(y<<z))>>>z for small constant z and y. | |
| 289 // Helps with array allocation math constant folding | |
| 290 // See 4790063: | |
| 291 // Unrestricted transformation is unsafe for some runtime values of 'x' | |
| 292 // ( x == 0, z == 1, y == -1 ) fails | |
| 293 // ( x == -5, z == 1, y == 1 ) fails | |
| 294 // Transform works for small z and small negative y when the addition | |
| 295 // (x + (y << z)) does not cross zero. | |
| 296 // Implement support for negative y and (x >= -(y << z)) | |
| 297 // Have not observed cases where type information exists to support | |
| 298 // positive y and (x <= -(y << z)) | |
| 299 if( op1 == Op_URShiftI && op2 == Op_ConI && | |
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300 in1->in(2)->Opcode() == Op_ConI ) { |
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301 jint z = phase->type( in1->in(2) )->is_int()->get_con() & 0x1f; // only least significant 5 bits matter |
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302 jint y = phase->type( in2 )->is_int()->get_con(); |
| 0 | 303 |
| 304 if( z < 5 && -5 < y && y < 0 ) { | |
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305 const Type *t_in11 = phase->type(in1->in(1)); |
| 0 | 306 if( t_in11 != Type::TOP && (t_in11->is_int()->_lo >= -(y << z)) ) { |
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307 Node *a = phase->transform( new (phase->C, 3) AddINode( in1->in(1), phase->intcon(y<<z) ) ); |
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308 return new (phase->C, 3) URShiftINode( a, in1->in(2) ); |
| 0 | 309 } |
| 310 } | |
| 311 } | |
| 312 | |
| 313 return AddNode::Ideal(phase, can_reshape); | |
| 314 } | |
| 315 | |
| 316 | |
| 317 //------------------------------Identity--------------------------------------- | |
| 318 // Fold (x-y)+y OR y+(x-y) into x | |
| 319 Node *AddINode::Identity( PhaseTransform *phase ) { | |
| 320 if( in(1)->Opcode() == Op_SubI && phase->eqv(in(1)->in(2),in(2)) ) { | |
| 321 return in(1)->in(1); | |
| 322 } | |
| 323 else if( in(2)->Opcode() == Op_SubI && phase->eqv(in(2)->in(2),in(1)) ) { | |
| 324 return in(2)->in(1); | |
| 325 } | |
| 326 return AddNode::Identity(phase); | |
| 327 } | |
| 328 | |
| 329 | |
| 330 //------------------------------add_ring--------------------------------------- | |
| 331 // Supplied function returns the sum of the inputs. Guaranteed never | |
| 332 // to be passed a TOP or BOTTOM type, these are filtered out by | |
| 333 // pre-check. | |
| 334 const Type *AddINode::add_ring( const Type *t0, const Type *t1 ) const { | |
| 335 const TypeInt *r0 = t0->is_int(); // Handy access | |
| 336 const TypeInt *r1 = t1->is_int(); | |
| 337 int lo = r0->_lo + r1->_lo; | |
| 338 int hi = r0->_hi + r1->_hi; | |
| 339 if( !(r0->is_con() && r1->is_con()) ) { | |
| 340 // Not both constants, compute approximate result | |
| 341 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) { | |
| 342 lo = min_jint; hi = max_jint; // Underflow on the low side | |
| 343 } | |
| 344 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) { | |
| 345 lo = min_jint; hi = max_jint; // Overflow on the high side | |
| 346 } | |
| 347 if( lo > hi ) { // Handle overflow | |
| 348 lo = min_jint; hi = max_jint; | |
| 349 } | |
| 350 } else { | |
| 351 // both constants, compute precise result using 'lo' and 'hi' | |
| 352 // Semantics define overflow and underflow for integer addition | |
| 353 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0 | |
| 354 } | |
| 355 return TypeInt::make( lo, hi, MAX2(r0->_widen,r1->_widen) ); | |
| 356 } | |
| 357 | |
| 358 | |
| 359 //============================================================================= | |
| 360 //------------------------------Idealize--------------------------------------- | |
| 361 Node *AddLNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
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362 Node* in1 = in(1); |
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363 Node* in2 = in(2); |
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364 int op1 = in1->Opcode(); |
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365 int op2 = in2->Opcode(); |
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366 // Fold (con1-x)+con2 into (con1+con2)-x |
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367 if ( op1 == Op_AddL && op2 == Op_SubL ) { |
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368 // Swap edges to try optimizations below |
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369 in1 = in2; |
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370 in2 = in(1); |
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371 op1 = op2; |
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372 op2 = in2->Opcode(); |
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373 } |
| 0 | 374 // Fold (con1-x)+con2 into (con1+con2)-x |
| 375 if( op1 == Op_SubL ) { | |
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376 const Type *t_sub1 = phase->type( in1->in(1) ); |
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377 const Type *t_2 = phase->type( in2 ); |
| 0 | 378 if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP ) |
| 379 return new (phase->C, 3) SubLNode(phase->makecon( add_ring( t_sub1, t_2 ) ), | |
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380 in1->in(2) ); |
| 0 | 381 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)" |
| 382 if( op2 == Op_SubL ) { | |
| 383 // Check for dead cycle: d = (a-b)+(c-d) | |
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384 assert( in1->in(2) != this && in2->in(2) != this, |
| 0 | 385 "dead loop in AddLNode::Ideal" ); |
| 386 Node *sub = new (phase->C, 3) SubLNode(NULL, NULL); | |
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387 sub->init_req(1, phase->transform(new (phase->C, 3) AddLNode(in1->in(1), in2->in(1) ) )); |
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388 sub->init_req(2, phase->transform(new (phase->C, 3) AddLNode(in1->in(2), in2->in(2) ) )); |
| 0 | 389 return sub; |
| 390 } | |
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391 // Convert "(a-b)+(b+c)" into "(a+c)" |
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392 if( op2 == Op_AddL && in1->in(2) == in2->in(1) ) { |
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393 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddLNode::Ideal"); |
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394 return new (phase->C, 3) AddLNode(in1->in(1), in2->in(2)); |
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395 } |
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396 // Convert "(a-b)+(c+b)" into "(a+c)" |
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397 if( op2 == Op_AddL && in1->in(2) == in2->in(2) ) { |
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398 assert(in1->in(1) != this && in2->in(1) != this,"dead loop in AddLNode::Ideal"); |
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399 return new (phase->C, 3) AddLNode(in1->in(1), in2->in(1)); |
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400 } |
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401 // Convert "(a-b)+(b-c)" into "(a-c)" |
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402 if( op2 == Op_SubL && in1->in(2) == in2->in(1) ) { |
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403 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddLNode::Ideal"); |
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404 return new (phase->C, 3) SubLNode(in1->in(1), in2->in(2)); |
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405 } |
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406 // Convert "(a-b)+(c-a)" into "(c-b)" |
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407 if( op2 == Op_SubL && in1->in(1) == in1->in(2) ) { |
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408 assert(in1->in(2) != this && in2->in(1) != this,"dead loop in AddLNode::Ideal"); |
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409 return new (phase->C, 3) SubLNode(in2->in(1), in1->in(2)); |
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410 } |
| 0 | 411 } |
| 412 | |
| 413 // Convert "x+(0-y)" into "(x-y)" | |
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414 if( op2 == Op_SubL && phase->type(in2->in(1)) == TypeLong::ZERO ) |
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415 return new (phase->C, 3) SubLNode( in1, in2->in(2) ); |
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416 |
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417 // Convert "(0-y)+x" into "(x-y)" |
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418 if( op1 == Op_SubL && phase->type(in1->in(1)) == TypeInt::ZERO ) |
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419 return new (phase->C, 3) SubLNode( in2, in1->in(2) ); |
| 0 | 420 |
| 421 // Convert "X+X+X+X+X...+X+Y" into "k*X+Y" or really convert "X+(X+Y)" | |
| 422 // into "(X<<1)+Y" and let shift-folding happen. | |
| 423 if( op2 == Op_AddL && | |
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424 in2->in(1) == in1 && |
| 0 | 425 op1 != Op_ConL && |
| 426 0 ) { | |
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427 Node *shift = phase->transform(new (phase->C, 3) LShiftLNode(in1,phase->intcon(1))); |
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428 return new (phase->C, 3) AddLNode(shift,in2->in(2)); |
| 0 | 429 } |
| 430 | |
| 431 return AddNode::Ideal(phase, can_reshape); | |
| 432 } | |
| 433 | |
| 434 | |
| 435 //------------------------------Identity--------------------------------------- | |
| 436 // Fold (x-y)+y OR y+(x-y) into x | |
| 437 Node *AddLNode::Identity( PhaseTransform *phase ) { | |
| 438 if( in(1)->Opcode() == Op_SubL && phase->eqv(in(1)->in(2),in(2)) ) { | |
| 439 return in(1)->in(1); | |
| 440 } | |
| 441 else if( in(2)->Opcode() == Op_SubL && phase->eqv(in(2)->in(2),in(1)) ) { | |
| 442 return in(2)->in(1); | |
| 443 } | |
| 444 return AddNode::Identity(phase); | |
| 445 } | |
| 446 | |
| 447 | |
| 448 //------------------------------add_ring--------------------------------------- | |
| 449 // Supplied function returns the sum of the inputs. Guaranteed never | |
| 450 // to be passed a TOP or BOTTOM type, these are filtered out by | |
| 451 // pre-check. | |
| 452 const Type *AddLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
| 453 const TypeLong *r0 = t0->is_long(); // Handy access | |
| 454 const TypeLong *r1 = t1->is_long(); | |
| 455 jlong lo = r0->_lo + r1->_lo; | |
| 456 jlong hi = r0->_hi + r1->_hi; | |
| 457 if( !(r0->is_con() && r1->is_con()) ) { | |
| 458 // Not both constants, compute approximate result | |
| 459 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) { | |
| 460 lo =min_jlong; hi = max_jlong; // Underflow on the low side | |
| 461 } | |
| 462 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) { | |
| 463 lo = min_jlong; hi = max_jlong; // Overflow on the high side | |
| 464 } | |
| 465 if( lo > hi ) { // Handle overflow | |
| 466 lo = min_jlong; hi = max_jlong; | |
| 467 } | |
| 468 } else { | |
| 469 // both constants, compute precise result using 'lo' and 'hi' | |
| 470 // Semantics define overflow and underflow for integer addition | |
| 471 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0 | |
| 472 } | |
| 473 return TypeLong::make( lo, hi, MAX2(r0->_widen,r1->_widen) ); | |
| 474 } | |
| 475 | |
| 476 | |
| 477 //============================================================================= | |
| 478 //------------------------------add_of_identity-------------------------------- | |
| 479 // Check for addition of the identity | |
| 480 const Type *AddFNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
| 481 // x ADD 0 should return x unless 'x' is a -zero | |
| 482 // | |
| 483 // const Type *zero = add_id(); // The additive identity | |
| 484 // jfloat f1 = t1->getf(); | |
| 485 // jfloat f2 = t2->getf(); | |
| 486 // | |
| 487 // if( t1->higher_equal( zero ) ) return t2; | |
| 488 // if( t2->higher_equal( zero ) ) return t1; | |
| 489 | |
| 490 return NULL; | |
| 491 } | |
| 492 | |
| 493 //------------------------------add_ring--------------------------------------- | |
| 494 // Supplied function returns the sum of the inputs. | |
| 495 // This also type-checks the inputs for sanity. Guaranteed never to | |
| 496 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
| 497 const Type *AddFNode::add_ring( const Type *t0, const Type *t1 ) const { | |
| 498 // We must be adding 2 float constants. | |
| 499 return TypeF::make( t0->getf() + t1->getf() ); | |
| 500 } | |
| 501 | |
| 502 //------------------------------Ideal------------------------------------------ | |
| 503 Node *AddFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 504 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
| 505 return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms | |
| 506 } | |
| 507 | |
| 508 // Floating point additions are not associative because of boundary conditions (infinity) | |
| 509 return commute(this, | |
| 510 phase->type( in(1) )->singleton(), | |
| 511 phase->type( in(2) )->singleton() ) ? this : NULL; | |
| 512 } | |
| 513 | |
| 514 | |
| 515 //============================================================================= | |
| 516 //------------------------------add_of_identity-------------------------------- | |
| 517 // Check for addition of the identity | |
| 518 const Type *AddDNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
| 519 // x ADD 0 should return x unless 'x' is a -zero | |
| 520 // | |
| 521 // const Type *zero = add_id(); // The additive identity | |
| 522 // jfloat f1 = t1->getf(); | |
| 523 // jfloat f2 = t2->getf(); | |
| 524 // | |
| 525 // if( t1->higher_equal( zero ) ) return t2; | |
| 526 // if( t2->higher_equal( zero ) ) return t1; | |
| 527 | |
| 528 return NULL; | |
| 529 } | |
| 530 //------------------------------add_ring--------------------------------------- | |
| 531 // Supplied function returns the sum of the inputs. | |
| 532 // This also type-checks the inputs for sanity. Guaranteed never to | |
| 533 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
| 534 const Type *AddDNode::add_ring( const Type *t0, const Type *t1 ) const { | |
| 535 // We must be adding 2 double constants. | |
| 536 return TypeD::make( t0->getd() + t1->getd() ); | |
| 537 } | |
| 538 | |
| 539 //------------------------------Ideal------------------------------------------ | |
| 540 Node *AddDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 541 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
| 542 return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms | |
| 543 } | |
| 544 | |
| 545 // Floating point additions are not associative because of boundary conditions (infinity) | |
| 546 return commute(this, | |
| 547 phase->type( in(1) )->singleton(), | |
| 548 phase->type( in(2) )->singleton() ) ? this : NULL; | |
| 549 } | |
| 550 | |
| 551 | |
| 552 //============================================================================= | |
| 553 //------------------------------Identity--------------------------------------- | |
| 554 // If one input is a constant 0, return the other input. | |
| 555 Node *AddPNode::Identity( PhaseTransform *phase ) { | |
| 556 return ( phase->type( in(Offset) )->higher_equal( TypeX_ZERO ) ) ? in(Address) : this; | |
| 557 } | |
| 558 | |
| 559 //------------------------------Idealize--------------------------------------- | |
| 560 Node *AddPNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 561 // Bail out if dead inputs | |
| 562 if( phase->type( in(Address) ) == Type::TOP ) return NULL; | |
| 563 | |
| 564 // If the left input is an add of a constant, flatten the expression tree. | |
| 565 const Node *n = in(Address); | |
| 566 if (n->is_AddP() && n->in(Base) == in(Base)) { | |
| 567 const AddPNode *addp = n->as_AddP(); // Left input is an AddP | |
| 568 assert( !addp->in(Address)->is_AddP() || | |
| 569 addp->in(Address)->as_AddP() != addp, | |
| 570 "dead loop in AddPNode::Ideal" ); | |
| 571 // Type of left input's right input | |
| 572 const Type *t = phase->type( addp->in(Offset) ); | |
| 573 if( t == Type::TOP ) return NULL; | |
| 574 const TypeX *t12 = t->is_intptr_t(); | |
| 575 if( t12->is_con() ) { // Left input is an add of a constant? | |
| 576 // If the right input is a constant, combine constants | |
| 577 const Type *temp_t2 = phase->type( in(Offset) ); | |
| 578 if( temp_t2 == Type::TOP ) return NULL; | |
| 579 const TypeX *t2 = temp_t2->is_intptr_t(); | |
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580 Node* address; |
|
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581 Node* offset; |
| 0 | 582 if( t2->is_con() ) { |
| 583 // The Add of the flattened expression | |
|
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584 address = addp->in(Address); |
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585 offset = phase->MakeConX(t2->get_con() + t12->get_con()); |
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586 } else { |
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587 // Else move the constant to the right. ((A+con)+B) into ((A+B)+con) |
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588 address = phase->transform(new (phase->C, 4) AddPNode(in(Base),addp->in(Address),in(Offset))); |
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589 offset = addp->in(Offset); |
| 0 | 590 } |
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591 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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592 if( igvn ) { |
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593 set_req_X(Address,address,igvn); |
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594 set_req_X(Offset,offset,igvn); |
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595 } else { |
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596 set_req(Address,address); |
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597 set_req(Offset,offset); |
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598 } |
| 0 | 599 return this; |
| 600 } | |
| 601 } | |
| 602 | |
| 603 // Raw pointers? | |
| 604 if( in(Base)->bottom_type() == Type::TOP ) { | |
| 605 // If this is a NULL+long form (from unsafe accesses), switch to a rawptr. | |
| 606 if (phase->type(in(Address)) == TypePtr::NULL_PTR) { | |
| 607 Node* offset = in(Offset); | |
| 608 return new (phase->C, 2) CastX2PNode(offset); | |
| 609 } | |
| 610 } | |
| 611 | |
| 612 // If the right is an add of a constant, push the offset down. | |
| 613 // Convert: (ptr + (offset+con)) into (ptr+offset)+con. | |
| 614 // The idea is to merge array_base+scaled_index groups together, | |
| 615 // and only have different constant offsets from the same base. | |
| 616 const Node *add = in(Offset); | |
| 617 if( add->Opcode() == Op_AddX && add->in(1) != add ) { | |
| 618 const Type *t22 = phase->type( add->in(2) ); | |
| 619 if( t22->singleton() && (t22 != Type::TOP) ) { // Right input is an add of a constant? | |
| 620 set_req(Address, phase->transform(new (phase->C, 4) AddPNode(in(Base),in(Address),add->in(1)))); | |
| 621 set_req(Offset, add->in(2)); | |
| 622 return this; // Made progress | |
| 623 } | |
| 624 } | |
| 625 | |
| 626 return NULL; // No progress | |
| 627 } | |
| 628 | |
| 629 //------------------------------bottom_type------------------------------------ | |
| 630 // Bottom-type is the pointer-type with unknown offset. | |
| 631 const Type *AddPNode::bottom_type() const { | |
| 632 if (in(Address) == NULL) return TypePtr::BOTTOM; | |
| 633 const TypePtr *tp = in(Address)->bottom_type()->isa_ptr(); | |
| 634 if( !tp ) return Type::TOP; // TOP input means TOP output | |
| 635 assert( in(Offset)->Opcode() != Op_ConP, "" ); | |
| 636 const Type *t = in(Offset)->bottom_type(); | |
| 637 if( t == Type::TOP ) | |
| 638 return tp->add_offset(Type::OffsetTop); | |
| 639 const TypeX *tx = t->is_intptr_t(); | |
| 640 intptr_t txoffset = Type::OffsetBot; | |
| 641 if (tx->is_con()) { // Left input is an add of a constant? | |
| 642 txoffset = tx->get_con(); | |
| 643 } | |
| 644 return tp->add_offset(txoffset); | |
| 645 } | |
| 646 | |
| 647 //------------------------------Value------------------------------------------ | |
| 648 const Type *AddPNode::Value( PhaseTransform *phase ) const { | |
| 649 // Either input is TOP ==> the result is TOP | |
| 650 const Type *t1 = phase->type( in(Address) ); | |
| 651 const Type *t2 = phase->type( in(Offset) ); | |
| 652 if( t1 == Type::TOP ) return Type::TOP; | |
| 653 if( t2 == Type::TOP ) return Type::TOP; | |
| 654 | |
| 655 // Left input is a pointer | |
| 656 const TypePtr *p1 = t1->isa_ptr(); | |
| 657 // Right input is an int | |
| 658 const TypeX *p2 = t2->is_intptr_t(); | |
| 659 // Add 'em | |
| 660 intptr_t p2offset = Type::OffsetBot; | |
| 661 if (p2->is_con()) { // Left input is an add of a constant? | |
| 662 p2offset = p2->get_con(); | |
| 663 } | |
| 664 return p1->add_offset(p2offset); | |
| 665 } | |
| 666 | |
| 667 //------------------------Ideal_base_and_offset-------------------------------- | |
| 668 // Split an oop pointer into a base and offset. | |
| 669 // (The offset might be Type::OffsetBot in the case of an array.) | |
| 670 // Return the base, or NULL if failure. | |
| 671 Node* AddPNode::Ideal_base_and_offset(Node* ptr, PhaseTransform* phase, | |
| 672 // second return value: | |
| 673 intptr_t& offset) { | |
| 674 if (ptr->is_AddP()) { | |
| 675 Node* base = ptr->in(AddPNode::Base); | |
| 676 Node* addr = ptr->in(AddPNode::Address); | |
| 677 Node* offs = ptr->in(AddPNode::Offset); | |
| 678 if (base == addr || base->is_top()) { | |
| 679 offset = phase->find_intptr_t_con(offs, Type::OffsetBot); | |
| 680 if (offset != Type::OffsetBot) { | |
| 681 return addr; | |
| 682 } | |
| 683 } | |
| 684 } | |
| 685 offset = Type::OffsetBot; | |
| 686 return NULL; | |
| 687 } | |
| 688 | |
|
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689 //------------------------------unpack_offsets---------------------------------- |
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690 // Collect the AddP offset values into the elements array, giving up |
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691 // if there are more than length. |
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692 int AddPNode::unpack_offsets(Node* elements[], int length) { |
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693 int count = 0; |
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694 Node* addr = this; |
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695 Node* base = addr->in(AddPNode::Base); |
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696 while (addr->is_AddP()) { |
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697 if (addr->in(AddPNode::Base) != base) { |
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698 // give up |
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699 return -1; |
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700 } |
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701 elements[count++] = addr->in(AddPNode::Offset); |
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702 if (count == length) { |
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703 // give up |
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704 return -1; |
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705 } |
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706 addr = addr->in(AddPNode::Address); |
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707 } |
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708 return count; |
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709 } |
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710 |
| 0 | 711 //------------------------------match_edge------------------------------------- |
| 712 // Do we Match on this edge index or not? Do not match base pointer edge | |
| 713 uint AddPNode::match_edge(uint idx) const { | |
| 714 return idx > Base; | |
| 715 } | |
| 716 | |
| 717 //---------------------------mach_bottom_type---------------------------------- | |
| 718 // Utility function for use by ADLC. Implements bottom_type for matched AddP. | |
| 719 const Type *AddPNode::mach_bottom_type( const MachNode* n) { | |
| 720 Node* base = n->in(Base); | |
| 721 const Type *t = base->bottom_type(); | |
| 722 if ( t == Type::TOP ) { | |
| 723 // an untyped pointer | |
| 724 return TypeRawPtr::BOTTOM; | |
| 725 } | |
| 726 const TypePtr* tp = t->isa_oopptr(); | |
| 727 if ( tp == NULL ) return t; | |
| 728 if ( tp->_offset == TypePtr::OffsetBot ) return tp; | |
| 729 | |
| 730 // We must carefully add up the various offsets... | |
| 731 intptr_t offset = 0; | |
| 732 const TypePtr* tptr = NULL; | |
| 733 | |
| 734 uint numopnds = n->num_opnds(); | |
| 735 uint index = n->oper_input_base(); | |
| 736 for ( uint i = 1; i < numopnds; i++ ) { | |
| 737 MachOper *opnd = n->_opnds[i]; | |
| 738 // Check for any interesting operand info. | |
| 739 // In particular, check for both memory and non-memory operands. | |
| 740 // %%%%% Clean this up: use xadd_offset | |
|
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741 intptr_t con = opnd->constant(); |
| 0 | 742 if ( con == TypePtr::OffsetBot ) goto bottom_out; |
| 743 offset += con; | |
| 744 con = opnd->constant_disp(); | |
| 745 if ( con == TypePtr::OffsetBot ) goto bottom_out; | |
| 746 offset += con; | |
| 747 if( opnd->scale() != 0 ) goto bottom_out; | |
| 748 | |
| 749 // Check each operand input edge. Find the 1 allowed pointer | |
| 750 // edge. Other edges must be index edges; track exact constant | |
| 751 // inputs and otherwise assume the worst. | |
| 752 for ( uint j = opnd->num_edges(); j > 0; j-- ) { | |
| 753 Node* edge = n->in(index++); | |
| 754 const Type* et = edge->bottom_type(); | |
| 755 const TypeX* eti = et->isa_intptr_t(); | |
| 756 if ( eti == NULL ) { | |
| 757 // there must be one pointer among the operands | |
| 758 guarantee(tptr == NULL, "must be only one pointer operand"); | |
| 759 tptr = et->isa_oopptr(); | |
| 760 guarantee(tptr != NULL, "non-int operand must be pointer"); | |
|
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761 if (tptr->higher_equal(tp->add_offset(tptr->offset()))) |
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762 tp = tptr; // Set more precise type for bailout |
| 0 | 763 continue; |
| 764 } | |
| 765 if ( eti->_hi != eti->_lo ) goto bottom_out; | |
| 766 offset += eti->_lo; | |
| 767 } | |
| 768 } | |
| 769 guarantee(tptr != NULL, "must be exactly one pointer operand"); | |
| 770 return tptr->add_offset(offset); | |
| 771 | |
| 772 bottom_out: | |
| 773 return tp->add_offset(TypePtr::OffsetBot); | |
| 774 } | |
| 775 | |
| 776 //============================================================================= | |
| 777 //------------------------------Identity--------------------------------------- | |
| 778 Node *OrINode::Identity( PhaseTransform *phase ) { | |
| 779 // x | x => x | |
| 780 if (phase->eqv(in(1), in(2))) { | |
| 781 return in(1); | |
| 782 } | |
| 783 | |
| 784 return AddNode::Identity(phase); | |
| 785 } | |
| 786 | |
| 787 //------------------------------add_ring--------------------------------------- | |
| 788 // Supplied function returns the sum of the inputs IN THE CURRENT RING. For | |
| 789 // the logical operations the ring's ADD is really a logical OR function. | |
| 790 // This also type-checks the inputs for sanity. Guaranteed never to | |
| 791 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
| 792 const Type *OrINode::add_ring( const Type *t0, const Type *t1 ) const { | |
| 793 const TypeInt *r0 = t0->is_int(); // Handy access | |
| 794 const TypeInt *r1 = t1->is_int(); | |
| 795 | |
| 796 // If both args are bool, can figure out better types | |
| 797 if ( r0 == TypeInt::BOOL ) { | |
| 798 if ( r1 == TypeInt::ONE) { | |
| 799 return TypeInt::ONE; | |
| 800 } else if ( r1 == TypeInt::BOOL ) { | |
| 801 return TypeInt::BOOL; | |
| 802 } | |
| 803 } else if ( r0 == TypeInt::ONE ) { | |
| 804 if ( r1 == TypeInt::BOOL ) { | |
| 805 return TypeInt::ONE; | |
| 806 } | |
| 807 } | |
| 808 | |
| 809 // If either input is not a constant, just return all integers. | |
| 810 if( !r0->is_con() || !r1->is_con() ) | |
| 811 return TypeInt::INT; // Any integer, but still no symbols. | |
| 812 | |
| 813 // Otherwise just OR them bits. | |
| 814 return TypeInt::make( r0->get_con() | r1->get_con() ); | |
| 815 } | |
| 816 | |
| 817 //============================================================================= | |
| 818 //------------------------------Identity--------------------------------------- | |
| 819 Node *OrLNode::Identity( PhaseTransform *phase ) { | |
| 820 // x | x => x | |
| 821 if (phase->eqv(in(1), in(2))) { | |
| 822 return in(1); | |
| 823 } | |
| 824 | |
| 825 return AddNode::Identity(phase); | |
| 826 } | |
| 827 | |
| 828 //------------------------------add_ring--------------------------------------- | |
| 829 const Type *OrLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
| 830 const TypeLong *r0 = t0->is_long(); // Handy access | |
| 831 const TypeLong *r1 = t1->is_long(); | |
| 832 | |
| 833 // If either input is not a constant, just return all integers. | |
| 834 if( !r0->is_con() || !r1->is_con() ) | |
| 835 return TypeLong::LONG; // Any integer, but still no symbols. | |
| 836 | |
| 837 // Otherwise just OR them bits. | |
| 838 return TypeLong::make( r0->get_con() | r1->get_con() ); | |
| 839 } | |
| 840 | |
| 841 //============================================================================= | |
| 842 //------------------------------add_ring--------------------------------------- | |
| 843 // Supplied function returns the sum of the inputs IN THE CURRENT RING. For | |
| 844 // the logical operations the ring's ADD is really a logical OR function. | |
| 845 // This also type-checks the inputs for sanity. Guaranteed never to | |
| 846 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
| 847 const Type *XorINode::add_ring( const Type *t0, const Type *t1 ) const { | |
| 848 const TypeInt *r0 = t0->is_int(); // Handy access | |
| 849 const TypeInt *r1 = t1->is_int(); | |
| 850 | |
| 851 // Complementing a boolean? | |
| 852 if( r0 == TypeInt::BOOL && ( r1 == TypeInt::ONE | |
| 853 || r1 == TypeInt::BOOL)) | |
| 854 return TypeInt::BOOL; | |
| 855 | |
| 856 if( !r0->is_con() || !r1->is_con() ) // Not constants | |
| 857 return TypeInt::INT; // Any integer, but still no symbols. | |
| 858 | |
| 859 // Otherwise just XOR them bits. | |
| 860 return TypeInt::make( r0->get_con() ^ r1->get_con() ); | |
| 861 } | |
| 862 | |
| 863 //============================================================================= | |
| 864 //------------------------------add_ring--------------------------------------- | |
| 865 const Type *XorLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
| 866 const TypeLong *r0 = t0->is_long(); // Handy access | |
| 867 const TypeLong *r1 = t1->is_long(); | |
| 868 | |
| 869 // If either input is not a constant, just return all integers. | |
| 870 if( !r0->is_con() || !r1->is_con() ) | |
| 871 return TypeLong::LONG; // Any integer, but still no symbols. | |
| 872 | |
| 873 // Otherwise just OR them bits. | |
| 874 return TypeLong::make( r0->get_con() ^ r1->get_con() ); | |
| 875 } | |
| 876 | |
| 877 //============================================================================= | |
| 878 //------------------------------add_ring--------------------------------------- | |
| 879 // Supplied function returns the sum of the inputs. | |
| 880 const Type *MaxINode::add_ring( const Type *t0, const Type *t1 ) const { | |
| 881 const TypeInt *r0 = t0->is_int(); // Handy access | |
| 882 const TypeInt *r1 = t1->is_int(); | |
| 883 | |
| 884 // Otherwise just MAX them bits. | |
| 885 return TypeInt::make( MAX2(r0->_lo,r1->_lo), MAX2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) ); | |
| 886 } | |
| 887 | |
| 888 //============================================================================= | |
| 889 //------------------------------Idealize--------------------------------------- | |
| 890 // MINs show up in range-check loop limit calculations. Look for | |
| 891 // "MIN2(x+c0,MIN2(y,x+c1))". Pick the smaller constant: "MIN2(x+c0,y)" | |
| 892 Node *MinINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 893 Node *progress = NULL; | |
| 894 // Force a right-spline graph | |
| 895 Node *l = in(1); | |
| 896 Node *r = in(2); | |
| 897 // Transform MinI1( MinI2(a,b), c) into MinI1( a, MinI2(b,c) ) | |
| 898 // to force a right-spline graph for the rest of MinINode::Ideal(). | |
| 899 if( l->Opcode() == Op_MinI ) { | |
| 900 assert( l != l->in(1), "dead loop in MinINode::Ideal" ); | |
| 901 r = phase->transform(new (phase->C, 3) MinINode(l->in(2),r)); | |
| 902 l = l->in(1); | |
| 903 set_req(1, l); | |
| 904 set_req(2, r); | |
| 905 return this; | |
| 906 } | |
| 907 | |
| 908 // Get left input & constant | |
| 909 Node *x = l; | |
| 910 int x_off = 0; | |
| 911 if( x->Opcode() == Op_AddI && // Check for "x+c0" and collect constant | |
| 912 x->in(2)->is_Con() ) { | |
| 913 const Type *t = x->in(2)->bottom_type(); | |
| 914 if( t == Type::TOP ) return NULL; // No progress | |
| 915 x_off = t->is_int()->get_con(); | |
| 916 x = x->in(1); | |
| 917 } | |
| 918 | |
| 919 // Scan a right-spline-tree for MINs | |
| 920 Node *y = r; | |
| 921 int y_off = 0; | |
| 922 // Check final part of MIN tree | |
| 923 if( y->Opcode() == Op_AddI && // Check for "y+c1" and collect constant | |
| 924 y->in(2)->is_Con() ) { | |
| 925 const Type *t = y->in(2)->bottom_type(); | |
| 926 if( t == Type::TOP ) return NULL; // No progress | |
| 927 y_off = t->is_int()->get_con(); | |
| 928 y = y->in(1); | |
| 929 } | |
| 930 if( x->_idx > y->_idx && r->Opcode() != Op_MinI ) { | |
| 931 swap_edges(1, 2); | |
| 932 return this; | |
| 933 } | |
| 934 | |
| 935 | |
| 936 if( r->Opcode() == Op_MinI ) { | |
| 937 assert( r != r->in(2), "dead loop in MinINode::Ideal" ); | |
| 938 y = r->in(1); | |
| 939 // Check final part of MIN tree | |
| 940 if( y->Opcode() == Op_AddI &&// Check for "y+c1" and collect constant | |
| 941 y->in(2)->is_Con() ) { | |
| 942 const Type *t = y->in(2)->bottom_type(); | |
| 943 if( t == Type::TOP ) return NULL; // No progress | |
| 944 y_off = t->is_int()->get_con(); | |
| 945 y = y->in(1); | |
| 946 } | |
| 947 | |
| 948 if( x->_idx > y->_idx ) | |
| 949 return new (phase->C, 3) MinINode(r->in(1),phase->transform(new (phase->C, 3) MinINode(l,r->in(2)))); | |
| 950 | |
| 951 // See if covers: MIN2(x+c0,MIN2(y+c1,z)) | |
| 952 if( !phase->eqv(x,y) ) return NULL; | |
| 953 // If (y == x) transform MIN2(x+c0, MIN2(x+c1,z)) into | |
| 954 // MIN2(x+c0 or x+c1 which less, z). | |
| 955 return new (phase->C, 3) MinINode(phase->transform(new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off)))),r->in(2)); | |
| 956 } else { | |
| 957 // See if covers: MIN2(x+c0,y+c1) | |
| 958 if( !phase->eqv(x,y) ) return NULL; | |
| 959 // If (y == x) transform MIN2(x+c0,x+c1) into x+c0 or x+c1 which less. | |
| 960 return new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off))); | |
| 961 } | |
| 962 | |
| 963 } | |
| 964 | |
| 965 //------------------------------add_ring--------------------------------------- | |
| 966 // Supplied function returns the sum of the inputs. | |
| 967 const Type *MinINode::add_ring( const Type *t0, const Type *t1 ) const { | |
| 968 const TypeInt *r0 = t0->is_int(); // Handy access | |
| 969 const TypeInt *r1 = t1->is_int(); | |
| 970 | |
| 971 // Otherwise just MIN them bits. | |
| 972 return TypeInt::make( MIN2(r0->_lo,r1->_lo), MIN2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) ); | |
| 973 } |