Sat, 16 Mar 2013 07:39:14 -0700
8009166: [parfait] Null pointer deference in hotspot/src/share/vm/opto/type.cpp
Summary: add guarantee() to as_instance_type()
Reviewed-by: kvn, twisti
duke@435 | 1 | /* |
mikael@4153 | 2 | * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "memory/allocation.inline.hpp" |
stefank@2314 | 27 | #include "opto/addnode.hpp" |
stefank@2314 | 28 | #include "opto/connode.hpp" |
stefank@2314 | 29 | #include "opto/memnode.hpp" |
stefank@2314 | 30 | #include "opto/mulnode.hpp" |
stefank@2314 | 31 | #include "opto/phaseX.hpp" |
stefank@2314 | 32 | #include "opto/subnode.hpp" |
stefank@2314 | 33 | |
duke@435 | 34 | // Portions of code courtesy of Clifford Click |
duke@435 | 35 | |
duke@435 | 36 | |
duke@435 | 37 | //============================================================================= |
duke@435 | 38 | //------------------------------hash------------------------------------------- |
duke@435 | 39 | // Hash function over MulNodes. Needs to be commutative; i.e., I swap |
duke@435 | 40 | // (commute) inputs to MulNodes willy-nilly so the hash function must return |
duke@435 | 41 | // the same value in the presence of edge swapping. |
duke@435 | 42 | uint MulNode::hash() const { |
duke@435 | 43 | return (uintptr_t)in(1) + (uintptr_t)in(2) + Opcode(); |
duke@435 | 44 | } |
duke@435 | 45 | |
duke@435 | 46 | //------------------------------Identity--------------------------------------- |
duke@435 | 47 | // Multiplying a one preserves the other argument |
duke@435 | 48 | Node *MulNode::Identity( PhaseTransform *phase ) { |
duke@435 | 49 | register const Type *one = mul_id(); // The multiplicative identity |
duke@435 | 50 | if( phase->type( in(1) )->higher_equal( one ) ) return in(2); |
duke@435 | 51 | if( phase->type( in(2) )->higher_equal( one ) ) return in(1); |
duke@435 | 52 | |
duke@435 | 53 | return this; |
duke@435 | 54 | } |
duke@435 | 55 | |
duke@435 | 56 | //------------------------------Ideal------------------------------------------ |
duke@435 | 57 | // We also canonicalize the Node, moving constants to the right input, |
duke@435 | 58 | // and flatten expressions (so that 1+x+2 becomes x+3). |
duke@435 | 59 | Node *MulNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
duke@435 | 60 | const Type *t1 = phase->type( in(1) ); |
duke@435 | 61 | const Type *t2 = phase->type( in(2) ); |
duke@435 | 62 | Node *progress = NULL; // Progress flag |
duke@435 | 63 | // We are OK if right is a constant, or right is a load and |
duke@435 | 64 | // left is a non-constant. |
duke@435 | 65 | if( !(t2->singleton() || |
duke@435 | 66 | (in(2)->is_Load() && !(t1->singleton() || in(1)->is_Load())) ) ) { |
duke@435 | 67 | if( t1->singleton() || // Left input is a constant? |
duke@435 | 68 | // Otherwise, sort inputs (commutativity) to help value numbering. |
duke@435 | 69 | (in(1)->_idx > in(2)->_idx) ) { |
duke@435 | 70 | swap_edges(1, 2); |
duke@435 | 71 | const Type *t = t1; |
duke@435 | 72 | t1 = t2; |
duke@435 | 73 | t2 = t; |
duke@435 | 74 | progress = this; // Made progress |
duke@435 | 75 | } |
duke@435 | 76 | } |
duke@435 | 77 | |
duke@435 | 78 | // If the right input is a constant, and the left input is a product of a |
duke@435 | 79 | // constant, flatten the expression tree. |
duke@435 | 80 | uint op = Opcode(); |
duke@435 | 81 | if( t2->singleton() && // Right input is a constant? |
duke@435 | 82 | op != Op_MulF && // Float & double cannot reassociate |
duke@435 | 83 | op != Op_MulD ) { |
duke@435 | 84 | if( t2 == Type::TOP ) return NULL; |
duke@435 | 85 | Node *mul1 = in(1); |
duke@435 | 86 | #ifdef ASSERT |
duke@435 | 87 | // Check for dead loop |
duke@435 | 88 | int op1 = mul1->Opcode(); |
duke@435 | 89 | if( phase->eqv( mul1, this ) || phase->eqv( in(2), this ) || |
duke@435 | 90 | ( op1 == mul_opcode() || op1 == add_opcode() ) && |
duke@435 | 91 | ( phase->eqv( mul1->in(1), this ) || phase->eqv( mul1->in(2), this ) || |
duke@435 | 92 | phase->eqv( mul1->in(1), mul1 ) || phase->eqv( mul1->in(2), mul1 ) ) ) |
duke@435 | 93 | assert(false, "dead loop in MulNode::Ideal"); |
duke@435 | 94 | #endif |
duke@435 | 95 | |
duke@435 | 96 | if( mul1->Opcode() == mul_opcode() ) { // Left input is a multiply? |
duke@435 | 97 | // Mul of a constant? |
duke@435 | 98 | const Type *t12 = phase->type( mul1->in(2) ); |
duke@435 | 99 | if( t12->singleton() && t12 != Type::TOP) { // Left input is an add of a constant? |
duke@435 | 100 | // Compute new constant; check for overflow |
kvn@3040 | 101 | const Type *tcon01 = ((MulNode*)mul1)->mul_ring(t2,t12); |
duke@435 | 102 | if( tcon01->singleton() ) { |
duke@435 | 103 | // The Mul of the flattened expression |
duke@435 | 104 | set_req(1, mul1->in(1)); |
duke@435 | 105 | set_req(2, phase->makecon( tcon01 )); |
duke@435 | 106 | t2 = tcon01; |
duke@435 | 107 | progress = this; // Made progress |
duke@435 | 108 | } |
duke@435 | 109 | } |
duke@435 | 110 | } |
duke@435 | 111 | // If the right input is a constant, and the left input is an add of a |
duke@435 | 112 | // constant, flatten the tree: (X+con1)*con0 ==> X*con0 + con1*con0 |
duke@435 | 113 | const Node *add1 = in(1); |
duke@435 | 114 | if( add1->Opcode() == add_opcode() ) { // Left input is an add? |
duke@435 | 115 | // Add of a constant? |
duke@435 | 116 | const Type *t12 = phase->type( add1->in(2) ); |
duke@435 | 117 | if( t12->singleton() && t12 != Type::TOP ) { // Left input is an add of a constant? |
duke@435 | 118 | assert( add1->in(1) != add1, "dead loop in MulNode::Ideal" ); |
duke@435 | 119 | // Compute new constant; check for overflow |
duke@435 | 120 | const Type *tcon01 = mul_ring(t2,t12); |
duke@435 | 121 | if( tcon01->singleton() ) { |
duke@435 | 122 | |
duke@435 | 123 | // Convert (X+con1)*con0 into X*con0 |
duke@435 | 124 | Node *mul = clone(); // mul = ()*con0 |
duke@435 | 125 | mul->set_req(1,add1->in(1)); // mul = X*con0 |
duke@435 | 126 | mul = phase->transform(mul); |
duke@435 | 127 | |
duke@435 | 128 | Node *add2 = add1->clone(); |
duke@435 | 129 | add2->set_req(1, mul); // X*con0 + con0*con1 |
duke@435 | 130 | add2->set_req(2, phase->makecon(tcon01) ); |
duke@435 | 131 | progress = add2; |
duke@435 | 132 | } |
duke@435 | 133 | } |
duke@435 | 134 | } // End of is left input an add |
duke@435 | 135 | } // End of is right input a Mul |
duke@435 | 136 | |
duke@435 | 137 | return progress; |
duke@435 | 138 | } |
duke@435 | 139 | |
duke@435 | 140 | //------------------------------Value----------------------------------------- |
duke@435 | 141 | const Type *MulNode::Value( PhaseTransform *phase ) const { |
duke@435 | 142 | const Type *t1 = phase->type( in(1) ); |
duke@435 | 143 | const Type *t2 = phase->type( in(2) ); |
duke@435 | 144 | // Either input is TOP ==> the result is TOP |
duke@435 | 145 | if( t1 == Type::TOP ) return Type::TOP; |
duke@435 | 146 | if( t2 == Type::TOP ) return Type::TOP; |
duke@435 | 147 | |
duke@435 | 148 | // Either input is ZERO ==> the result is ZERO. |
duke@435 | 149 | // Not valid for floats or doubles since +0.0 * -0.0 --> +0.0 |
duke@435 | 150 | int op = Opcode(); |
duke@435 | 151 | if( op == Op_MulI || op == Op_AndI || op == Op_MulL || op == Op_AndL ) { |
duke@435 | 152 | const Type *zero = add_id(); // The multiplicative zero |
duke@435 | 153 | if( t1->higher_equal( zero ) ) return zero; |
duke@435 | 154 | if( t2->higher_equal( zero ) ) return zero; |
duke@435 | 155 | } |
duke@435 | 156 | |
duke@435 | 157 | // Either input is BOTTOM ==> the result is the local BOTTOM |
duke@435 | 158 | if( t1 == Type::BOTTOM || t2 == Type::BOTTOM ) |
duke@435 | 159 | return bottom_type(); |
duke@435 | 160 | |
rasbold@839 | 161 | #if defined(IA32) |
rasbold@839 | 162 | // Can't trust native compilers to properly fold strict double |
rasbold@839 | 163 | // multiplication with round-to-zero on this platform. |
rasbold@839 | 164 | if (op == Op_MulD && phase->C->method()->is_strict()) { |
rasbold@839 | 165 | return TypeD::DOUBLE; |
rasbold@839 | 166 | } |
rasbold@839 | 167 | #endif |
rasbold@839 | 168 | |
duke@435 | 169 | return mul_ring(t1,t2); // Local flavor of type multiplication |
duke@435 | 170 | } |
duke@435 | 171 | |
duke@435 | 172 | |
duke@435 | 173 | //============================================================================= |
duke@435 | 174 | //------------------------------Ideal------------------------------------------ |
duke@435 | 175 | // Check for power-of-2 multiply, then try the regular MulNode::Ideal |
duke@435 | 176 | Node *MulINode::Ideal(PhaseGVN *phase, bool can_reshape) { |
duke@435 | 177 | // Swap constant to right |
duke@435 | 178 | jint con; |
duke@435 | 179 | if ((con = in(1)->find_int_con(0)) != 0) { |
duke@435 | 180 | swap_edges(1, 2); |
duke@435 | 181 | // Finish rest of method to use info in 'con' |
duke@435 | 182 | } else if ((con = in(2)->find_int_con(0)) == 0) { |
duke@435 | 183 | return MulNode::Ideal(phase, can_reshape); |
duke@435 | 184 | } |
duke@435 | 185 | |
duke@435 | 186 | // Now we have a constant Node on the right and the constant in con |
duke@435 | 187 | if( con == 0 ) return NULL; // By zero is handled by Value call |
duke@435 | 188 | if( con == 1 ) return NULL; // By one is handled by Identity call |
duke@435 | 189 | |
duke@435 | 190 | // Check for negative constant; if so negate the final result |
duke@435 | 191 | bool sign_flip = false; |
duke@435 | 192 | if( con < 0 ) { |
duke@435 | 193 | con = -con; |
duke@435 | 194 | sign_flip = true; |
duke@435 | 195 | } |
duke@435 | 196 | |
duke@435 | 197 | // Get low bit; check for being the only bit |
duke@435 | 198 | Node *res = NULL; |
duke@435 | 199 | jint bit1 = con & -con; // Extract low bit |
duke@435 | 200 | if( bit1 == con ) { // Found a power of 2? |
kvn@4115 | 201 | res = new (phase->C) LShiftINode( in(1), phase->intcon(log2_intptr(bit1)) ); |
duke@435 | 202 | } else { |
duke@435 | 203 | |
duke@435 | 204 | // Check for constant with 2 bits set |
duke@435 | 205 | jint bit2 = con-bit1; |
duke@435 | 206 | bit2 = bit2 & -bit2; // Extract 2nd bit |
duke@435 | 207 | if( bit2 + bit1 == con ) { // Found all bits in con? |
kvn@4115 | 208 | Node *n1 = phase->transform( new (phase->C) LShiftINode( in(1), phase->intcon(log2_intptr(bit1)) ) ); |
kvn@4115 | 209 | Node *n2 = phase->transform( new (phase->C) LShiftINode( in(1), phase->intcon(log2_intptr(bit2)) ) ); |
kvn@4115 | 210 | res = new (phase->C) AddINode( n2, n1 ); |
duke@435 | 211 | |
duke@435 | 212 | } else if (is_power_of_2(con+1)) { |
duke@435 | 213 | // Sleezy: power-of-2 -1. Next time be generic. |
duke@435 | 214 | jint temp = (jint) (con + 1); |
kvn@4115 | 215 | Node *n1 = phase->transform( new (phase->C) LShiftINode( in(1), phase->intcon(log2_intptr(temp)) ) ); |
kvn@4115 | 216 | res = new (phase->C) SubINode( n1, in(1) ); |
duke@435 | 217 | } else { |
duke@435 | 218 | return MulNode::Ideal(phase, can_reshape); |
duke@435 | 219 | } |
duke@435 | 220 | } |
duke@435 | 221 | |
duke@435 | 222 | if( sign_flip ) { // Need to negate result? |
duke@435 | 223 | res = phase->transform(res);// Transform, before making the zero con |
kvn@4115 | 224 | res = new (phase->C) SubINode(phase->intcon(0),res); |
duke@435 | 225 | } |
duke@435 | 226 | |
duke@435 | 227 | return res; // Return final result |
duke@435 | 228 | } |
duke@435 | 229 | |
duke@435 | 230 | //------------------------------mul_ring--------------------------------------- |
duke@435 | 231 | // Compute the product type of two integer ranges into this node. |
duke@435 | 232 | const Type *MulINode::mul_ring(const Type *t0, const Type *t1) const { |
duke@435 | 233 | const TypeInt *r0 = t0->is_int(); // Handy access |
duke@435 | 234 | const TypeInt *r1 = t1->is_int(); |
duke@435 | 235 | |
duke@435 | 236 | // Fetch endpoints of all ranges |
duke@435 | 237 | int32 lo0 = r0->_lo; |
duke@435 | 238 | double a = (double)lo0; |
duke@435 | 239 | int32 hi0 = r0->_hi; |
duke@435 | 240 | double b = (double)hi0; |
duke@435 | 241 | int32 lo1 = r1->_lo; |
duke@435 | 242 | double c = (double)lo1; |
duke@435 | 243 | int32 hi1 = r1->_hi; |
duke@435 | 244 | double d = (double)hi1; |
duke@435 | 245 | |
duke@435 | 246 | // Compute all endpoints & check for overflow |
duke@435 | 247 | int32 A = lo0*lo1; |
duke@435 | 248 | if( (double)A != a*c ) return TypeInt::INT; // Overflow? |
duke@435 | 249 | int32 B = lo0*hi1; |
duke@435 | 250 | if( (double)B != a*d ) return TypeInt::INT; // Overflow? |
duke@435 | 251 | int32 C = hi0*lo1; |
duke@435 | 252 | if( (double)C != b*c ) return TypeInt::INT; // Overflow? |
duke@435 | 253 | int32 D = hi0*hi1; |
duke@435 | 254 | if( (double)D != b*d ) return TypeInt::INT; // Overflow? |
duke@435 | 255 | |
duke@435 | 256 | if( A < B ) { lo0 = A; hi0 = B; } // Sort range endpoints |
duke@435 | 257 | else { lo0 = B; hi0 = A; } |
duke@435 | 258 | if( C < D ) { |
duke@435 | 259 | if( C < lo0 ) lo0 = C; |
duke@435 | 260 | if( D > hi0 ) hi0 = D; |
duke@435 | 261 | } else { |
duke@435 | 262 | if( D < lo0 ) lo0 = D; |
duke@435 | 263 | if( C > hi0 ) hi0 = C; |
duke@435 | 264 | } |
duke@435 | 265 | return TypeInt::make(lo0, hi0, MAX2(r0->_widen,r1->_widen)); |
duke@435 | 266 | } |
duke@435 | 267 | |
duke@435 | 268 | |
duke@435 | 269 | //============================================================================= |
duke@435 | 270 | //------------------------------Ideal------------------------------------------ |
duke@435 | 271 | // Check for power-of-2 multiply, then try the regular MulNode::Ideal |
duke@435 | 272 | Node *MulLNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
duke@435 | 273 | // Swap constant to right |
duke@435 | 274 | jlong con; |
duke@435 | 275 | if ((con = in(1)->find_long_con(0)) != 0) { |
duke@435 | 276 | swap_edges(1, 2); |
duke@435 | 277 | // Finish rest of method to use info in 'con' |
duke@435 | 278 | } else if ((con = in(2)->find_long_con(0)) == 0) { |
duke@435 | 279 | return MulNode::Ideal(phase, can_reshape); |
duke@435 | 280 | } |
duke@435 | 281 | |
duke@435 | 282 | // Now we have a constant Node on the right and the constant in con |
duke@435 | 283 | if( con == CONST64(0) ) return NULL; // By zero is handled by Value call |
duke@435 | 284 | if( con == CONST64(1) ) return NULL; // By one is handled by Identity call |
duke@435 | 285 | |
duke@435 | 286 | // Check for negative constant; if so negate the final result |
duke@435 | 287 | bool sign_flip = false; |
duke@435 | 288 | if( con < 0 ) { |
duke@435 | 289 | con = -con; |
duke@435 | 290 | sign_flip = true; |
duke@435 | 291 | } |
duke@435 | 292 | |
duke@435 | 293 | // Get low bit; check for being the only bit |
duke@435 | 294 | Node *res = NULL; |
duke@435 | 295 | jlong bit1 = con & -con; // Extract low bit |
duke@435 | 296 | if( bit1 == con ) { // Found a power of 2? |
kvn@4115 | 297 | res = new (phase->C) LShiftLNode( in(1), phase->intcon(log2_long(bit1)) ); |
duke@435 | 298 | } else { |
duke@435 | 299 | |
duke@435 | 300 | // Check for constant with 2 bits set |
duke@435 | 301 | jlong bit2 = con-bit1; |
duke@435 | 302 | bit2 = bit2 & -bit2; // Extract 2nd bit |
duke@435 | 303 | if( bit2 + bit1 == con ) { // Found all bits in con? |
kvn@4115 | 304 | Node *n1 = phase->transform( new (phase->C) LShiftLNode( in(1), phase->intcon(log2_long(bit1)) ) ); |
kvn@4115 | 305 | Node *n2 = phase->transform( new (phase->C) LShiftLNode( in(1), phase->intcon(log2_long(bit2)) ) ); |
kvn@4115 | 306 | res = new (phase->C) AddLNode( n2, n1 ); |
duke@435 | 307 | |
duke@435 | 308 | } else if (is_power_of_2_long(con+1)) { |
duke@435 | 309 | // Sleezy: power-of-2 -1. Next time be generic. |
duke@435 | 310 | jlong temp = (jlong) (con + 1); |
kvn@4115 | 311 | Node *n1 = phase->transform( new (phase->C) LShiftLNode( in(1), phase->intcon(log2_long(temp)) ) ); |
kvn@4115 | 312 | res = new (phase->C) SubLNode( n1, in(1) ); |
duke@435 | 313 | } else { |
duke@435 | 314 | return MulNode::Ideal(phase, can_reshape); |
duke@435 | 315 | } |
duke@435 | 316 | } |
duke@435 | 317 | |
duke@435 | 318 | if( sign_flip ) { // Need to negate result? |
duke@435 | 319 | res = phase->transform(res);// Transform, before making the zero con |
kvn@4115 | 320 | res = new (phase->C) SubLNode(phase->longcon(0),res); |
duke@435 | 321 | } |
duke@435 | 322 | |
duke@435 | 323 | return res; // Return final result |
duke@435 | 324 | } |
duke@435 | 325 | |
duke@435 | 326 | //------------------------------mul_ring--------------------------------------- |
duke@435 | 327 | // Compute the product type of two integer ranges into this node. |
duke@435 | 328 | const Type *MulLNode::mul_ring(const Type *t0, const Type *t1) const { |
duke@435 | 329 | const TypeLong *r0 = t0->is_long(); // Handy access |
duke@435 | 330 | const TypeLong *r1 = t1->is_long(); |
duke@435 | 331 | |
duke@435 | 332 | // Fetch endpoints of all ranges |
duke@435 | 333 | jlong lo0 = r0->_lo; |
duke@435 | 334 | double a = (double)lo0; |
duke@435 | 335 | jlong hi0 = r0->_hi; |
duke@435 | 336 | double b = (double)hi0; |
duke@435 | 337 | jlong lo1 = r1->_lo; |
duke@435 | 338 | double c = (double)lo1; |
duke@435 | 339 | jlong hi1 = r1->_hi; |
duke@435 | 340 | double d = (double)hi1; |
duke@435 | 341 | |
duke@435 | 342 | // Compute all endpoints & check for overflow |
duke@435 | 343 | jlong A = lo0*lo1; |
duke@435 | 344 | if( (double)A != a*c ) return TypeLong::LONG; // Overflow? |
duke@435 | 345 | jlong B = lo0*hi1; |
duke@435 | 346 | if( (double)B != a*d ) return TypeLong::LONG; // Overflow? |
duke@435 | 347 | jlong C = hi0*lo1; |
duke@435 | 348 | if( (double)C != b*c ) return TypeLong::LONG; // Overflow? |
duke@435 | 349 | jlong D = hi0*hi1; |
duke@435 | 350 | if( (double)D != b*d ) return TypeLong::LONG; // Overflow? |
duke@435 | 351 | |
duke@435 | 352 | if( A < B ) { lo0 = A; hi0 = B; } // Sort range endpoints |
duke@435 | 353 | else { lo0 = B; hi0 = A; } |
duke@435 | 354 | if( C < D ) { |
duke@435 | 355 | if( C < lo0 ) lo0 = C; |
duke@435 | 356 | if( D > hi0 ) hi0 = D; |
duke@435 | 357 | } else { |
duke@435 | 358 | if( D < lo0 ) lo0 = D; |
duke@435 | 359 | if( C > hi0 ) hi0 = C; |
duke@435 | 360 | } |
duke@435 | 361 | return TypeLong::make(lo0, hi0, MAX2(r0->_widen,r1->_widen)); |
duke@435 | 362 | } |
duke@435 | 363 | |
duke@435 | 364 | //============================================================================= |
duke@435 | 365 | //------------------------------mul_ring--------------------------------------- |
duke@435 | 366 | // Compute the product type of two double ranges into this node. |
duke@435 | 367 | const Type *MulFNode::mul_ring(const Type *t0, const Type *t1) const { |
duke@435 | 368 | if( t0 == Type::FLOAT || t1 == Type::FLOAT ) return Type::FLOAT; |
duke@435 | 369 | return TypeF::make( t0->getf() * t1->getf() ); |
duke@435 | 370 | } |
duke@435 | 371 | |
duke@435 | 372 | //============================================================================= |
duke@435 | 373 | //------------------------------mul_ring--------------------------------------- |
duke@435 | 374 | // Compute the product type of two double ranges into this node. |
duke@435 | 375 | const Type *MulDNode::mul_ring(const Type *t0, const Type *t1) const { |
duke@435 | 376 | if( t0 == Type::DOUBLE || t1 == Type::DOUBLE ) return Type::DOUBLE; |
rasbold@839 | 377 | // We must be multiplying 2 double constants. |
duke@435 | 378 | return TypeD::make( t0->getd() * t1->getd() ); |
duke@435 | 379 | } |
duke@435 | 380 | |
duke@435 | 381 | //============================================================================= |
rasbold@580 | 382 | //------------------------------Value------------------------------------------ |
rasbold@580 | 383 | const Type *MulHiLNode::Value( PhaseTransform *phase ) const { |
rasbold@580 | 384 | // Either input is TOP ==> the result is TOP |
rasbold@580 | 385 | const Type *t1 = phase->type( in(1) ); |
rasbold@580 | 386 | const Type *t2 = phase->type( in(2) ); |
rasbold@580 | 387 | if( t1 == Type::TOP ) return Type::TOP; |
rasbold@580 | 388 | if( t2 == Type::TOP ) return Type::TOP; |
rasbold@580 | 389 | |
rasbold@580 | 390 | // Either input is BOTTOM ==> the result is the local BOTTOM |
rasbold@580 | 391 | const Type *bot = bottom_type(); |
rasbold@580 | 392 | if( (t1 == bot) || (t2 == bot) || |
rasbold@580 | 393 | (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) |
rasbold@580 | 394 | return bot; |
rasbold@580 | 395 | |
rasbold@580 | 396 | // It is not worth trying to constant fold this stuff! |
rasbold@580 | 397 | return TypeLong::LONG; |
rasbold@580 | 398 | } |
rasbold@580 | 399 | |
rasbold@580 | 400 | //============================================================================= |
duke@435 | 401 | //------------------------------mul_ring--------------------------------------- |
duke@435 | 402 | // Supplied function returns the product of the inputs IN THE CURRENT RING. |
duke@435 | 403 | // For the logical operations the ring's MUL is really a logical AND function. |
duke@435 | 404 | // This also type-checks the inputs for sanity. Guaranteed never to |
duke@435 | 405 | // be passed a TOP or BOTTOM type, these are filtered out by pre-check. |
duke@435 | 406 | const Type *AndINode::mul_ring( const Type *t0, const Type *t1 ) const { |
duke@435 | 407 | const TypeInt *r0 = t0->is_int(); // Handy access |
duke@435 | 408 | const TypeInt *r1 = t1->is_int(); |
duke@435 | 409 | int widen = MAX2(r0->_widen,r1->_widen); |
duke@435 | 410 | |
duke@435 | 411 | // If either input is a constant, might be able to trim cases |
duke@435 | 412 | if( !r0->is_con() && !r1->is_con() ) |
duke@435 | 413 | return TypeInt::INT; // No constants to be had |
duke@435 | 414 | |
duke@435 | 415 | // Both constants? Return bits |
duke@435 | 416 | if( r0->is_con() && r1->is_con() ) |
duke@435 | 417 | return TypeInt::make( r0->get_con() & r1->get_con() ); |
duke@435 | 418 | |
duke@435 | 419 | if( r0->is_con() && r0->get_con() > 0 ) |
duke@435 | 420 | return TypeInt::make(0, r0->get_con(), widen); |
duke@435 | 421 | |
duke@435 | 422 | if( r1->is_con() && r1->get_con() > 0 ) |
duke@435 | 423 | return TypeInt::make(0, r1->get_con(), widen); |
duke@435 | 424 | |
duke@435 | 425 | if( r0 == TypeInt::BOOL || r1 == TypeInt::BOOL ) { |
duke@435 | 426 | return TypeInt::BOOL; |
duke@435 | 427 | } |
duke@435 | 428 | |
duke@435 | 429 | return TypeInt::INT; // No constants to be had |
duke@435 | 430 | } |
duke@435 | 431 | |
duke@435 | 432 | //------------------------------Identity--------------------------------------- |
duke@435 | 433 | // Masking off the high bits of an unsigned load is not required |
duke@435 | 434 | Node *AndINode::Identity( PhaseTransform *phase ) { |
duke@435 | 435 | |
duke@435 | 436 | // x & x => x |
duke@435 | 437 | if (phase->eqv(in(1), in(2))) return in(1); |
duke@435 | 438 | |
twisti@1259 | 439 | Node* in1 = in(1); |
twisti@1259 | 440 | uint op = in1->Opcode(); |
twisti@1259 | 441 | const TypeInt* t2 = phase->type(in(2))->isa_int(); |
twisti@1259 | 442 | if (t2 && t2->is_con()) { |
duke@435 | 443 | int con = t2->get_con(); |
duke@435 | 444 | // Masking off high bits which are always zero is useless. |
duke@435 | 445 | const TypeInt* t1 = phase->type( in(1) )->isa_int(); |
duke@435 | 446 | if (t1 != NULL && t1->_lo >= 0) { |
twisti@1259 | 447 | jint t1_support = right_n_bits(1 + log2_intptr(t1->_hi)); |
duke@435 | 448 | if ((t1_support & con) == t1_support) |
twisti@1259 | 449 | return in1; |
duke@435 | 450 | } |
duke@435 | 451 | // Masking off the high bits of a unsigned-shift-right is not |
duke@435 | 452 | // needed either. |
twisti@1259 | 453 | if (op == Op_URShiftI) { |
twisti@1259 | 454 | const TypeInt* t12 = phase->type(in1->in(2))->isa_int(); |
twisti@1259 | 455 | if (t12 && t12->is_con()) { // Shift is by a constant |
twisti@994 | 456 | int shift = t12->get_con(); |
twisti@994 | 457 | shift &= BitsPerJavaInteger - 1; // semantics of Java shifts |
twisti@994 | 458 | int mask = max_juint >> shift; |
twisti@1259 | 459 | if ((mask & con) == mask) // If AND is useless, skip it |
twisti@1259 | 460 | return in1; |
duke@435 | 461 | } |
duke@435 | 462 | } |
duke@435 | 463 | } |
duke@435 | 464 | return MulNode::Identity(phase); |
duke@435 | 465 | } |
duke@435 | 466 | |
duke@435 | 467 | //------------------------------Ideal------------------------------------------ |
duke@435 | 468 | Node *AndINode::Ideal(PhaseGVN *phase, bool can_reshape) { |
duke@435 | 469 | // Special case constant AND mask |
duke@435 | 470 | const TypeInt *t2 = phase->type( in(2) )->isa_int(); |
duke@435 | 471 | if( !t2 || !t2->is_con() ) return MulNode::Ideal(phase, can_reshape); |
duke@435 | 472 | const int mask = t2->get_con(); |
duke@435 | 473 | Node *load = in(1); |
duke@435 | 474 | uint lop = load->Opcode(); |
duke@435 | 475 | |
duke@435 | 476 | // Masking bits off of a Character? Hi bits are already zero. |
twisti@993 | 477 | if( lop == Op_LoadUS && |
duke@435 | 478 | (mask & 0xFFFF0000) ) // Can we make a smaller mask? |
kvn@4115 | 479 | return new (phase->C) AndINode(load,phase->intcon(mask&0xFFFF)); |
duke@435 | 480 | |
duke@435 | 481 | // Masking bits off of a Short? Loading a Character does some masking |
vlivanov@4202 | 482 | if (can_reshape && |
vlivanov@4202 | 483 | load->outcnt() == 1 && load->unique_out() == this) { |
vlivanov@4202 | 484 | if (lop == Op_LoadS && (mask & 0xFFFF0000) == 0 ) { |
vlivanov@4202 | 485 | Node *ldus = new (phase->C) LoadUSNode(load->in(MemNode::Control), |
vlivanov@4202 | 486 | load->in(MemNode::Memory), |
vlivanov@4202 | 487 | load->in(MemNode::Address), |
vlivanov@4202 | 488 | load->adr_type()); |
vlivanov@4202 | 489 | ldus = phase->transform(ldus); |
vlivanov@4202 | 490 | return new (phase->C) AndINode(ldus, phase->intcon(mask & 0xFFFF)); |
vlivanov@4202 | 491 | } |
duke@435 | 492 | |
vlivanov@4202 | 493 | // Masking sign bits off of a Byte? Do an unsigned byte load plus |
vlivanov@4202 | 494 | // an and. |
vlivanov@4202 | 495 | if (lop == Op_LoadB && (mask & 0xFFFFFF00) == 0) { |
vlivanov@4202 | 496 | Node* ldub = new (phase->C) LoadUBNode(load->in(MemNode::Control), |
vlivanov@4202 | 497 | load->in(MemNode::Memory), |
vlivanov@4202 | 498 | load->in(MemNode::Address), |
vlivanov@4202 | 499 | load->adr_type()); |
vlivanov@4202 | 500 | ldub = phase->transform(ldub); |
vlivanov@4202 | 501 | return new (phase->C) AndINode(ldub, phase->intcon(mask)); |
vlivanov@4202 | 502 | } |
duke@435 | 503 | } |
duke@435 | 504 | |
duke@435 | 505 | // Masking off sign bits? Dont make them! |
duke@435 | 506 | if( lop == Op_RShiftI ) { |
duke@435 | 507 | const TypeInt *t12 = phase->type(load->in(2))->isa_int(); |
duke@435 | 508 | if( t12 && t12->is_con() ) { // Shift is by a constant |
duke@435 | 509 | int shift = t12->get_con(); |
duke@435 | 510 | shift &= BitsPerJavaInteger-1; // semantics of Java shifts |
duke@435 | 511 | const int sign_bits_mask = ~right_n_bits(BitsPerJavaInteger - shift); |
duke@435 | 512 | // If the AND'ing of the 2 masks has no bits, then only original shifted |
duke@435 | 513 | // bits survive. NO sign-extension bits survive the maskings. |
duke@435 | 514 | if( (sign_bits_mask & mask) == 0 ) { |
duke@435 | 515 | // Use zero-fill shift instead |
kvn@4115 | 516 | Node *zshift = phase->transform(new (phase->C) URShiftINode(load->in(1),load->in(2))); |
kvn@4115 | 517 | return new (phase->C) AndINode( zshift, in(2) ); |
duke@435 | 518 | } |
duke@435 | 519 | } |
duke@435 | 520 | } |
duke@435 | 521 | |
duke@435 | 522 | // Check for 'negate/and-1', a pattern emitted when someone asks for |
duke@435 | 523 | // 'mod 2'. Negate leaves the low order bit unchanged (think: complement |
duke@435 | 524 | // plus 1) and the mask is of the low order bit. Skip the negate. |
duke@435 | 525 | if( lop == Op_SubI && mask == 1 && load->in(1) && |
duke@435 | 526 | phase->type(load->in(1)) == TypeInt::ZERO ) |
kvn@4115 | 527 | return new (phase->C) AndINode( load->in(2), in(2) ); |
duke@435 | 528 | |
duke@435 | 529 | return MulNode::Ideal(phase, can_reshape); |
duke@435 | 530 | } |
duke@435 | 531 | |
duke@435 | 532 | //============================================================================= |
duke@435 | 533 | //------------------------------mul_ring--------------------------------------- |
duke@435 | 534 | // Supplied function returns the product of the inputs IN THE CURRENT RING. |
duke@435 | 535 | // For the logical operations the ring's MUL is really a logical AND function. |
duke@435 | 536 | // This also type-checks the inputs for sanity. Guaranteed never to |
duke@435 | 537 | // be passed a TOP or BOTTOM type, these are filtered out by pre-check. |
duke@435 | 538 | const Type *AndLNode::mul_ring( const Type *t0, const Type *t1 ) const { |
duke@435 | 539 | const TypeLong *r0 = t0->is_long(); // Handy access |
duke@435 | 540 | const TypeLong *r1 = t1->is_long(); |
duke@435 | 541 | int widen = MAX2(r0->_widen,r1->_widen); |
duke@435 | 542 | |
duke@435 | 543 | // If either input is a constant, might be able to trim cases |
duke@435 | 544 | if( !r0->is_con() && !r1->is_con() ) |
duke@435 | 545 | return TypeLong::LONG; // No constants to be had |
duke@435 | 546 | |
duke@435 | 547 | // Both constants? Return bits |
duke@435 | 548 | if( r0->is_con() && r1->is_con() ) |
duke@435 | 549 | return TypeLong::make( r0->get_con() & r1->get_con() ); |
duke@435 | 550 | |
duke@435 | 551 | if( r0->is_con() && r0->get_con() > 0 ) |
duke@435 | 552 | return TypeLong::make(CONST64(0), r0->get_con(), widen); |
duke@435 | 553 | |
duke@435 | 554 | if( r1->is_con() && r1->get_con() > 0 ) |
duke@435 | 555 | return TypeLong::make(CONST64(0), r1->get_con(), widen); |
duke@435 | 556 | |
duke@435 | 557 | return TypeLong::LONG; // No constants to be had |
duke@435 | 558 | } |
duke@435 | 559 | |
duke@435 | 560 | //------------------------------Identity--------------------------------------- |
duke@435 | 561 | // Masking off the high bits of an unsigned load is not required |
duke@435 | 562 | Node *AndLNode::Identity( PhaseTransform *phase ) { |
duke@435 | 563 | |
duke@435 | 564 | // x & x => x |
duke@435 | 565 | if (phase->eqv(in(1), in(2))) return in(1); |
duke@435 | 566 | |
duke@435 | 567 | Node *usr = in(1); |
duke@435 | 568 | const TypeLong *t2 = phase->type( in(2) )->isa_long(); |
duke@435 | 569 | if( t2 && t2->is_con() ) { |
duke@435 | 570 | jlong con = t2->get_con(); |
duke@435 | 571 | // Masking off high bits which are always zero is useless. |
duke@435 | 572 | const TypeLong* t1 = phase->type( in(1) )->isa_long(); |
duke@435 | 573 | if (t1 != NULL && t1->_lo >= 0) { |
duke@435 | 574 | jlong t1_support = ((jlong)1 << (1 + log2_long(t1->_hi))) - 1; |
duke@435 | 575 | if ((t1_support & con) == t1_support) |
duke@435 | 576 | return usr; |
duke@435 | 577 | } |
duke@435 | 578 | uint lop = usr->Opcode(); |
duke@435 | 579 | // Masking off the high bits of a unsigned-shift-right is not |
duke@435 | 580 | // needed either. |
duke@435 | 581 | if( lop == Op_URShiftL ) { |
duke@435 | 582 | const TypeInt *t12 = phase->type( usr->in(2) )->isa_int(); |
twisti@994 | 583 | if( t12 && t12->is_con() ) { // Shift is by a constant |
twisti@994 | 584 | int shift = t12->get_con(); |
twisti@994 | 585 | shift &= BitsPerJavaLong - 1; // semantics of Java shifts |
twisti@994 | 586 | jlong mask = max_julong >> shift; |
duke@435 | 587 | if( (mask&con) == mask ) // If AND is useless, skip it |
duke@435 | 588 | return usr; |
duke@435 | 589 | } |
duke@435 | 590 | } |
duke@435 | 591 | } |
duke@435 | 592 | return MulNode::Identity(phase); |
duke@435 | 593 | } |
duke@435 | 594 | |
duke@435 | 595 | //------------------------------Ideal------------------------------------------ |
duke@435 | 596 | Node *AndLNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
duke@435 | 597 | // Special case constant AND mask |
duke@435 | 598 | const TypeLong *t2 = phase->type( in(2) )->isa_long(); |
duke@435 | 599 | if( !t2 || !t2->is_con() ) return MulNode::Ideal(phase, can_reshape); |
duke@435 | 600 | const jlong mask = t2->get_con(); |
duke@435 | 601 | |
twisti@1059 | 602 | Node* in1 = in(1); |
twisti@1059 | 603 | uint op = in1->Opcode(); |
twisti@1059 | 604 | |
twisti@1259 | 605 | // Are we masking a long that was converted from an int with a mask |
twisti@1332 | 606 | // that fits in 32-bits? Commute them and use an AndINode. Don't |
twisti@1332 | 607 | // convert masks which would cause a sign extension of the integer |
twisti@1332 | 608 | // value. This check includes UI2L masks (0x00000000FFFFFFFF) which |
twisti@1332 | 609 | // would be optimized away later in Identity. |
twisti@1332 | 610 | if (op == Op_ConvI2L && (mask & CONST64(0xFFFFFFFF80000000)) == 0) { |
kvn@4115 | 611 | Node* andi = new (phase->C) AndINode(in1->in(1), phase->intcon(mask)); |
twisti@1332 | 612 | andi = phase->transform(andi); |
kvn@4115 | 613 | return new (phase->C) ConvI2LNode(andi); |
twisti@1259 | 614 | } |
twisti@1259 | 615 | |
duke@435 | 616 | // Masking off sign bits? Dont make them! |
twisti@1059 | 617 | if (op == Op_RShiftL) { |
twisti@1259 | 618 | const TypeInt* t12 = phase->type(in1->in(2))->isa_int(); |
duke@435 | 619 | if( t12 && t12->is_con() ) { // Shift is by a constant |
duke@435 | 620 | int shift = t12->get_con(); |
twisti@994 | 621 | shift &= BitsPerJavaLong - 1; // semantics of Java shifts |
twisti@994 | 622 | const jlong sign_bits_mask = ~(((jlong)CONST64(1) << (jlong)(BitsPerJavaLong - shift)) -1); |
duke@435 | 623 | // If the AND'ing of the 2 masks has no bits, then only original shifted |
duke@435 | 624 | // bits survive. NO sign-extension bits survive the maskings. |
duke@435 | 625 | if( (sign_bits_mask & mask) == 0 ) { |
duke@435 | 626 | // Use zero-fill shift instead |
kvn@4115 | 627 | Node *zshift = phase->transform(new (phase->C) URShiftLNode(in1->in(1), in1->in(2))); |
kvn@4115 | 628 | return new (phase->C) AndLNode(zshift, in(2)); |
duke@435 | 629 | } |
duke@435 | 630 | } |
duke@435 | 631 | } |
duke@435 | 632 | |
duke@435 | 633 | return MulNode::Ideal(phase, can_reshape); |
duke@435 | 634 | } |
duke@435 | 635 | |
duke@435 | 636 | //============================================================================= |
duke@435 | 637 | //------------------------------Identity--------------------------------------- |
duke@435 | 638 | Node *LShiftINode::Identity( PhaseTransform *phase ) { |
duke@435 | 639 | const TypeInt *ti = phase->type( in(2) )->isa_int(); // shift count is an int |
duke@435 | 640 | return ( ti && ti->is_con() && ( ti->get_con() & ( BitsPerInt - 1 ) ) == 0 ) ? in(1) : this; |
duke@435 | 641 | } |
duke@435 | 642 | |
duke@435 | 643 | //------------------------------Ideal------------------------------------------ |
duke@435 | 644 | // If the right input is a constant, and the left input is an add of a |
duke@435 | 645 | // constant, flatten the tree: (X+con1)<<con0 ==> X<<con0 + con1<<con0 |
duke@435 | 646 | Node *LShiftINode::Ideal(PhaseGVN *phase, bool can_reshape) { |
duke@435 | 647 | const Type *t = phase->type( in(2) ); |
duke@435 | 648 | if( t == Type::TOP ) return NULL; // Right input is dead |
duke@435 | 649 | const TypeInt *t2 = t->isa_int(); |
duke@435 | 650 | if( !t2 || !t2->is_con() ) return NULL; // Right input is a constant |
duke@435 | 651 | const int con = t2->get_con() & ( BitsPerInt - 1 ); // masked shift count |
duke@435 | 652 | |
duke@435 | 653 | if ( con == 0 ) return NULL; // let Identity() handle 0 shift count |
duke@435 | 654 | |
duke@435 | 655 | // Left input is an add of a constant? |
duke@435 | 656 | Node *add1 = in(1); |
duke@435 | 657 | int add1_op = add1->Opcode(); |
duke@435 | 658 | if( add1_op == Op_AddI ) { // Left input is an add? |
duke@435 | 659 | assert( add1 != add1->in(1), "dead loop in LShiftINode::Ideal" ); |
duke@435 | 660 | const TypeInt *t12 = phase->type(add1->in(2))->isa_int(); |
duke@435 | 661 | if( t12 && t12->is_con() ){ // Left input is an add of a con? |
duke@435 | 662 | // Transform is legal, but check for profit. Avoid breaking 'i2s' |
duke@435 | 663 | // and 'i2b' patterns which typically fold into 'StoreC/StoreB'. |
duke@435 | 664 | if( con < 16 ) { |
duke@435 | 665 | // Compute X << con0 |
kvn@4115 | 666 | Node *lsh = phase->transform( new (phase->C) LShiftINode( add1->in(1), in(2) ) ); |
duke@435 | 667 | // Compute X<<con0 + (con1<<con0) |
kvn@4115 | 668 | return new (phase->C) AddINode( lsh, phase->intcon(t12->get_con() << con)); |
duke@435 | 669 | } |
duke@435 | 670 | } |
duke@435 | 671 | } |
duke@435 | 672 | |
duke@435 | 673 | // Check for "(x>>c0)<<c0" which just masks off low bits |
duke@435 | 674 | if( (add1_op == Op_RShiftI || add1_op == Op_URShiftI ) && |
duke@435 | 675 | add1->in(2) == in(2) ) |
duke@435 | 676 | // Convert to "(x & -(1<<c0))" |
kvn@4115 | 677 | return new (phase->C) AndINode(add1->in(1),phase->intcon( -(1<<con))); |
duke@435 | 678 | |
duke@435 | 679 | // Check for "((x>>c0) & Y)<<c0" which just masks off more low bits |
duke@435 | 680 | if( add1_op == Op_AndI ) { |
duke@435 | 681 | Node *add2 = add1->in(1); |
duke@435 | 682 | int add2_op = add2->Opcode(); |
duke@435 | 683 | if( (add2_op == Op_RShiftI || add2_op == Op_URShiftI ) && |
duke@435 | 684 | add2->in(2) == in(2) ) { |
duke@435 | 685 | // Convert to "(x & (Y<<c0))" |
kvn@4115 | 686 | Node *y_sh = phase->transform( new (phase->C) LShiftINode( add1->in(2), in(2) ) ); |
kvn@4115 | 687 | return new (phase->C) AndINode( add2->in(1), y_sh ); |
duke@435 | 688 | } |
duke@435 | 689 | } |
duke@435 | 690 | |
duke@435 | 691 | // Check for ((x & ((1<<(32-c0))-1)) << c0) which ANDs off high bits |
duke@435 | 692 | // before shifting them away. |
duke@435 | 693 | const jint bits_mask = right_n_bits(BitsPerJavaInteger-con); |
duke@435 | 694 | if( add1_op == Op_AndI && |
duke@435 | 695 | phase->type(add1->in(2)) == TypeInt::make( bits_mask ) ) |
kvn@4115 | 696 | return new (phase->C) LShiftINode( add1->in(1), in(2) ); |
duke@435 | 697 | |
duke@435 | 698 | return NULL; |
duke@435 | 699 | } |
duke@435 | 700 | |
duke@435 | 701 | //------------------------------Value------------------------------------------ |
duke@435 | 702 | // A LShiftINode shifts its input2 left by input1 amount. |
duke@435 | 703 | const Type *LShiftINode::Value( PhaseTransform *phase ) const { |
duke@435 | 704 | const Type *t1 = phase->type( in(1) ); |
duke@435 | 705 | const Type *t2 = phase->type( in(2) ); |
duke@435 | 706 | // Either input is TOP ==> the result is TOP |
duke@435 | 707 | if( t1 == Type::TOP ) return Type::TOP; |
duke@435 | 708 | if( t2 == Type::TOP ) return Type::TOP; |
duke@435 | 709 | |
duke@435 | 710 | // Left input is ZERO ==> the result is ZERO. |
duke@435 | 711 | if( t1 == TypeInt::ZERO ) return TypeInt::ZERO; |
duke@435 | 712 | // Shift by zero does nothing |
duke@435 | 713 | if( t2 == TypeInt::ZERO ) return t1; |
duke@435 | 714 | |
duke@435 | 715 | // Either input is BOTTOM ==> the result is BOTTOM |
duke@435 | 716 | if( (t1 == TypeInt::INT) || (t2 == TypeInt::INT) || |
duke@435 | 717 | (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) |
duke@435 | 718 | return TypeInt::INT; |
duke@435 | 719 | |
duke@435 | 720 | const TypeInt *r1 = t1->is_int(); // Handy access |
duke@435 | 721 | const TypeInt *r2 = t2->is_int(); // Handy access |
duke@435 | 722 | |
duke@435 | 723 | if (!r2->is_con()) |
duke@435 | 724 | return TypeInt::INT; |
duke@435 | 725 | |
duke@435 | 726 | uint shift = r2->get_con(); |
duke@435 | 727 | shift &= BitsPerJavaInteger-1; // semantics of Java shifts |
duke@435 | 728 | // Shift by a multiple of 32 does nothing: |
duke@435 | 729 | if (shift == 0) return t1; |
duke@435 | 730 | |
duke@435 | 731 | // If the shift is a constant, shift the bounds of the type, |
duke@435 | 732 | // unless this could lead to an overflow. |
duke@435 | 733 | if (!r1->is_con()) { |
duke@435 | 734 | jint lo = r1->_lo, hi = r1->_hi; |
duke@435 | 735 | if (((lo << shift) >> shift) == lo && |
duke@435 | 736 | ((hi << shift) >> shift) == hi) { |
duke@435 | 737 | // No overflow. The range shifts up cleanly. |
duke@435 | 738 | return TypeInt::make((jint)lo << (jint)shift, |
duke@435 | 739 | (jint)hi << (jint)shift, |
duke@435 | 740 | MAX2(r1->_widen,r2->_widen)); |
duke@435 | 741 | } |
duke@435 | 742 | return TypeInt::INT; |
duke@435 | 743 | } |
duke@435 | 744 | |
duke@435 | 745 | return TypeInt::make( (jint)r1->get_con() << (jint)shift ); |
duke@435 | 746 | } |
duke@435 | 747 | |
duke@435 | 748 | //============================================================================= |
duke@435 | 749 | //------------------------------Identity--------------------------------------- |
duke@435 | 750 | Node *LShiftLNode::Identity( PhaseTransform *phase ) { |
duke@435 | 751 | const TypeInt *ti = phase->type( in(2) )->isa_int(); // shift count is an int |
duke@435 | 752 | return ( ti && ti->is_con() && ( ti->get_con() & ( BitsPerLong - 1 ) ) == 0 ) ? in(1) : this; |
duke@435 | 753 | } |
duke@435 | 754 | |
duke@435 | 755 | //------------------------------Ideal------------------------------------------ |
duke@435 | 756 | // If the right input is a constant, and the left input is an add of a |
duke@435 | 757 | // constant, flatten the tree: (X+con1)<<con0 ==> X<<con0 + con1<<con0 |
duke@435 | 758 | Node *LShiftLNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
duke@435 | 759 | const Type *t = phase->type( in(2) ); |
duke@435 | 760 | if( t == Type::TOP ) return NULL; // Right input is dead |
duke@435 | 761 | const TypeInt *t2 = t->isa_int(); |
duke@435 | 762 | if( !t2 || !t2->is_con() ) return NULL; // Right input is a constant |
duke@435 | 763 | const int con = t2->get_con() & ( BitsPerLong - 1 ); // masked shift count |
duke@435 | 764 | |
duke@435 | 765 | if ( con == 0 ) return NULL; // let Identity() handle 0 shift count |
duke@435 | 766 | |
duke@435 | 767 | // Left input is an add of a constant? |
duke@435 | 768 | Node *add1 = in(1); |
duke@435 | 769 | int add1_op = add1->Opcode(); |
duke@435 | 770 | if( add1_op == Op_AddL ) { // Left input is an add? |
duke@435 | 771 | // Avoid dead data cycles from dead loops |
duke@435 | 772 | assert( add1 != add1->in(1), "dead loop in LShiftLNode::Ideal" ); |
duke@435 | 773 | const TypeLong *t12 = phase->type(add1->in(2))->isa_long(); |
duke@435 | 774 | if( t12 && t12->is_con() ){ // Left input is an add of a con? |
duke@435 | 775 | // Compute X << con0 |
kvn@4115 | 776 | Node *lsh = phase->transform( new (phase->C) LShiftLNode( add1->in(1), in(2) ) ); |
duke@435 | 777 | // Compute X<<con0 + (con1<<con0) |
kvn@4115 | 778 | return new (phase->C) AddLNode( lsh, phase->longcon(t12->get_con() << con)); |
duke@435 | 779 | } |
duke@435 | 780 | } |
duke@435 | 781 | |
duke@435 | 782 | // Check for "(x>>c0)<<c0" which just masks off low bits |
duke@435 | 783 | if( (add1_op == Op_RShiftL || add1_op == Op_URShiftL ) && |
duke@435 | 784 | add1->in(2) == in(2) ) |
duke@435 | 785 | // Convert to "(x & -(1<<c0))" |
kvn@4115 | 786 | return new (phase->C) AndLNode(add1->in(1),phase->longcon( -(CONST64(1)<<con))); |
duke@435 | 787 | |
duke@435 | 788 | // Check for "((x>>c0) & Y)<<c0" which just masks off more low bits |
duke@435 | 789 | if( add1_op == Op_AndL ) { |
duke@435 | 790 | Node *add2 = add1->in(1); |
duke@435 | 791 | int add2_op = add2->Opcode(); |
duke@435 | 792 | if( (add2_op == Op_RShiftL || add2_op == Op_URShiftL ) && |
duke@435 | 793 | add2->in(2) == in(2) ) { |
duke@435 | 794 | // Convert to "(x & (Y<<c0))" |
kvn@4115 | 795 | Node *y_sh = phase->transform( new (phase->C) LShiftLNode( add1->in(2), in(2) ) ); |
kvn@4115 | 796 | return new (phase->C) AndLNode( add2->in(1), y_sh ); |
duke@435 | 797 | } |
duke@435 | 798 | } |
duke@435 | 799 | |
duke@435 | 800 | // Check for ((x & ((CONST64(1)<<(64-c0))-1)) << c0) which ANDs off high bits |
duke@435 | 801 | // before shifting them away. |
twisti@994 | 802 | const jlong bits_mask = ((jlong)CONST64(1) << (jlong)(BitsPerJavaLong - con)) - CONST64(1); |
duke@435 | 803 | if( add1_op == Op_AndL && |
duke@435 | 804 | phase->type(add1->in(2)) == TypeLong::make( bits_mask ) ) |
kvn@4115 | 805 | return new (phase->C) LShiftLNode( add1->in(1), in(2) ); |
duke@435 | 806 | |
duke@435 | 807 | return NULL; |
duke@435 | 808 | } |
duke@435 | 809 | |
duke@435 | 810 | //------------------------------Value------------------------------------------ |
duke@435 | 811 | // A LShiftLNode shifts its input2 left by input1 amount. |
duke@435 | 812 | const Type *LShiftLNode::Value( PhaseTransform *phase ) const { |
duke@435 | 813 | const Type *t1 = phase->type( in(1) ); |
duke@435 | 814 | const Type *t2 = phase->type( in(2) ); |
duke@435 | 815 | // Either input is TOP ==> the result is TOP |
duke@435 | 816 | if( t1 == Type::TOP ) return Type::TOP; |
duke@435 | 817 | if( t2 == Type::TOP ) return Type::TOP; |
duke@435 | 818 | |
duke@435 | 819 | // Left input is ZERO ==> the result is ZERO. |
duke@435 | 820 | if( t1 == TypeLong::ZERO ) return TypeLong::ZERO; |
duke@435 | 821 | // Shift by zero does nothing |
duke@435 | 822 | if( t2 == TypeInt::ZERO ) return t1; |
duke@435 | 823 | |
duke@435 | 824 | // Either input is BOTTOM ==> the result is BOTTOM |
duke@435 | 825 | if( (t1 == TypeLong::LONG) || (t2 == TypeInt::INT) || |
duke@435 | 826 | (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) |
duke@435 | 827 | return TypeLong::LONG; |
duke@435 | 828 | |
duke@435 | 829 | const TypeLong *r1 = t1->is_long(); // Handy access |
duke@435 | 830 | const TypeInt *r2 = t2->is_int(); // Handy access |
duke@435 | 831 | |
duke@435 | 832 | if (!r2->is_con()) |
duke@435 | 833 | return TypeLong::LONG; |
duke@435 | 834 | |
duke@435 | 835 | uint shift = r2->get_con(); |
twisti@994 | 836 | shift &= BitsPerJavaLong - 1; // semantics of Java shifts |
duke@435 | 837 | // Shift by a multiple of 64 does nothing: |
duke@435 | 838 | if (shift == 0) return t1; |
duke@435 | 839 | |
duke@435 | 840 | // If the shift is a constant, shift the bounds of the type, |
duke@435 | 841 | // unless this could lead to an overflow. |
duke@435 | 842 | if (!r1->is_con()) { |
duke@435 | 843 | jlong lo = r1->_lo, hi = r1->_hi; |
duke@435 | 844 | if (((lo << shift) >> shift) == lo && |
duke@435 | 845 | ((hi << shift) >> shift) == hi) { |
duke@435 | 846 | // No overflow. The range shifts up cleanly. |
duke@435 | 847 | return TypeLong::make((jlong)lo << (jint)shift, |
duke@435 | 848 | (jlong)hi << (jint)shift, |
duke@435 | 849 | MAX2(r1->_widen,r2->_widen)); |
duke@435 | 850 | } |
duke@435 | 851 | return TypeLong::LONG; |
duke@435 | 852 | } |
duke@435 | 853 | |
duke@435 | 854 | return TypeLong::make( (jlong)r1->get_con() << (jint)shift ); |
duke@435 | 855 | } |
duke@435 | 856 | |
duke@435 | 857 | //============================================================================= |
duke@435 | 858 | //------------------------------Identity--------------------------------------- |
duke@435 | 859 | Node *RShiftINode::Identity( PhaseTransform *phase ) { |
duke@435 | 860 | const TypeInt *t2 = phase->type(in(2))->isa_int(); |
duke@435 | 861 | if( !t2 ) return this; |
duke@435 | 862 | if ( t2->is_con() && ( t2->get_con() & ( BitsPerInt - 1 ) ) == 0 ) |
duke@435 | 863 | return in(1); |
duke@435 | 864 | |
duke@435 | 865 | // Check for useless sign-masking |
duke@435 | 866 | if( in(1)->Opcode() == Op_LShiftI && |
duke@435 | 867 | in(1)->req() == 3 && |
duke@435 | 868 | in(1)->in(2) == in(2) && |
duke@435 | 869 | t2->is_con() ) { |
duke@435 | 870 | uint shift = t2->get_con(); |
duke@435 | 871 | shift &= BitsPerJavaInteger-1; // semantics of Java shifts |
duke@435 | 872 | // Compute masks for which this shifting doesn't change |
duke@435 | 873 | int lo = (-1 << (BitsPerJavaInteger - shift-1)); // FFFF8000 |
duke@435 | 874 | int hi = ~lo; // 00007FFF |
duke@435 | 875 | const TypeInt *t11 = phase->type(in(1)->in(1))->isa_int(); |
duke@435 | 876 | if( !t11 ) return this; |
duke@435 | 877 | // Does actual value fit inside of mask? |
duke@435 | 878 | if( lo <= t11->_lo && t11->_hi <= hi ) |
duke@435 | 879 | return in(1)->in(1); // Then shifting is a nop |
duke@435 | 880 | } |
duke@435 | 881 | |
duke@435 | 882 | return this; |
duke@435 | 883 | } |
duke@435 | 884 | |
duke@435 | 885 | //------------------------------Ideal------------------------------------------ |
duke@435 | 886 | Node *RShiftINode::Ideal(PhaseGVN *phase, bool can_reshape) { |
duke@435 | 887 | // Inputs may be TOP if they are dead. |
duke@435 | 888 | const TypeInt *t1 = phase->type( in(1) )->isa_int(); |
duke@435 | 889 | if( !t1 ) return NULL; // Left input is an integer |
duke@435 | 890 | const TypeInt *t2 = phase->type( in(2) )->isa_int(); |
duke@435 | 891 | if( !t2 || !t2->is_con() ) return NULL; // Right input is a constant |
duke@435 | 892 | const TypeInt *t3; // type of in(1).in(2) |
duke@435 | 893 | int shift = t2->get_con(); |
duke@435 | 894 | shift &= BitsPerJavaInteger-1; // semantics of Java shifts |
duke@435 | 895 | |
duke@435 | 896 | if ( shift == 0 ) return NULL; // let Identity() handle 0 shift count |
duke@435 | 897 | |
duke@435 | 898 | // Check for (x & 0xFF000000) >> 24, whose mask can be made smaller. |
duke@435 | 899 | // Such expressions arise normally from shift chains like (byte)(x >> 24). |
duke@435 | 900 | const Node *mask = in(1); |
duke@435 | 901 | if( mask->Opcode() == Op_AndI && |
duke@435 | 902 | (t3 = phase->type(mask->in(2))->isa_int()) && |
duke@435 | 903 | t3->is_con() ) { |
duke@435 | 904 | Node *x = mask->in(1); |
duke@435 | 905 | jint maskbits = t3->get_con(); |
duke@435 | 906 | // Convert to "(x >> shift) & (mask >> shift)" |
kvn@4115 | 907 | Node *shr_nomask = phase->transform( new (phase->C) RShiftINode(mask->in(1), in(2)) ); |
kvn@4115 | 908 | return new (phase->C) AndINode(shr_nomask, phase->intcon( maskbits >> shift)); |
duke@435 | 909 | } |
duke@435 | 910 | |
duke@435 | 911 | // Check for "(short[i] <<16)>>16" which simply sign-extends |
duke@435 | 912 | const Node *shl = in(1); |
duke@435 | 913 | if( shl->Opcode() != Op_LShiftI ) return NULL; |
duke@435 | 914 | |
duke@435 | 915 | if( shift == 16 && |
duke@435 | 916 | (t3 = phase->type(shl->in(2))->isa_int()) && |
duke@435 | 917 | t3->is_con(16) ) { |
duke@435 | 918 | Node *ld = shl->in(1); |
duke@435 | 919 | if( ld->Opcode() == Op_LoadS ) { |
duke@435 | 920 | // Sign extension is just useless here. Return a RShiftI of zero instead |
duke@435 | 921 | // returning 'ld' directly. We cannot return an old Node directly as |
duke@435 | 922 | // that is the job of 'Identity' calls and Identity calls only work on |
duke@435 | 923 | // direct inputs ('ld' is an extra Node removed from 'this'). The |
duke@435 | 924 | // combined optimization requires Identity only return direct inputs. |
duke@435 | 925 | set_req(1, ld); |
duke@435 | 926 | set_req(2, phase->intcon(0)); |
duke@435 | 927 | return this; |
duke@435 | 928 | } |
vlivanov@4202 | 929 | else if( can_reshape && |
vlivanov@4202 | 930 | ld->Opcode() == Op_LoadUS && |
vlivanov@4202 | 931 | ld->outcnt() == 1 && ld->unique_out() == shl) |
duke@435 | 932 | // Replace zero-extension-load with sign-extension-load |
kvn@4115 | 933 | return new (phase->C) LoadSNode( ld->in(MemNode::Control), |
duke@435 | 934 | ld->in(MemNode::Memory), |
duke@435 | 935 | ld->in(MemNode::Address), |
duke@435 | 936 | ld->adr_type()); |
duke@435 | 937 | } |
duke@435 | 938 | |
duke@435 | 939 | // Check for "(byte[i] <<24)>>24" which simply sign-extends |
duke@435 | 940 | if( shift == 24 && |
duke@435 | 941 | (t3 = phase->type(shl->in(2))->isa_int()) && |
duke@435 | 942 | t3->is_con(24) ) { |
duke@435 | 943 | Node *ld = shl->in(1); |
duke@435 | 944 | if( ld->Opcode() == Op_LoadB ) { |
duke@435 | 945 | // Sign extension is just useless here |
duke@435 | 946 | set_req(1, ld); |
duke@435 | 947 | set_req(2, phase->intcon(0)); |
duke@435 | 948 | return this; |
duke@435 | 949 | } |
duke@435 | 950 | } |
duke@435 | 951 | |
duke@435 | 952 | return NULL; |
duke@435 | 953 | } |
duke@435 | 954 | |
duke@435 | 955 | //------------------------------Value------------------------------------------ |
duke@435 | 956 | // A RShiftINode shifts its input2 right by input1 amount. |
duke@435 | 957 | const Type *RShiftINode::Value( PhaseTransform *phase ) const { |
duke@435 | 958 | const Type *t1 = phase->type( in(1) ); |
duke@435 | 959 | const Type *t2 = phase->type( in(2) ); |
duke@435 | 960 | // Either input is TOP ==> the result is TOP |
duke@435 | 961 | if( t1 == Type::TOP ) return Type::TOP; |
duke@435 | 962 | if( t2 == Type::TOP ) return Type::TOP; |
duke@435 | 963 | |
duke@435 | 964 | // Left input is ZERO ==> the result is ZERO. |
duke@435 | 965 | if( t1 == TypeInt::ZERO ) return TypeInt::ZERO; |
duke@435 | 966 | // Shift by zero does nothing |
duke@435 | 967 | if( t2 == TypeInt::ZERO ) return t1; |
duke@435 | 968 | |
duke@435 | 969 | // Either input is BOTTOM ==> the result is BOTTOM |
duke@435 | 970 | if (t1 == Type::BOTTOM || t2 == Type::BOTTOM) |
duke@435 | 971 | return TypeInt::INT; |
duke@435 | 972 | |
duke@435 | 973 | if (t2 == TypeInt::INT) |
duke@435 | 974 | return TypeInt::INT; |
duke@435 | 975 | |
duke@435 | 976 | const TypeInt *r1 = t1->is_int(); // Handy access |
duke@435 | 977 | const TypeInt *r2 = t2->is_int(); // Handy access |
duke@435 | 978 | |
duke@435 | 979 | // If the shift is a constant, just shift the bounds of the type. |
duke@435 | 980 | // For example, if the shift is 31, we just propagate sign bits. |
duke@435 | 981 | if (r2->is_con()) { |
duke@435 | 982 | uint shift = r2->get_con(); |
duke@435 | 983 | shift &= BitsPerJavaInteger-1; // semantics of Java shifts |
duke@435 | 984 | // Shift by a multiple of 32 does nothing: |
duke@435 | 985 | if (shift == 0) return t1; |
duke@435 | 986 | // Calculate reasonably aggressive bounds for the result. |
duke@435 | 987 | // This is necessary if we are to correctly type things |
duke@435 | 988 | // like (x<<24>>24) == ((byte)x). |
duke@435 | 989 | jint lo = (jint)r1->_lo >> (jint)shift; |
duke@435 | 990 | jint hi = (jint)r1->_hi >> (jint)shift; |
duke@435 | 991 | assert(lo <= hi, "must have valid bounds"); |
duke@435 | 992 | const TypeInt* ti = TypeInt::make(lo, hi, MAX2(r1->_widen,r2->_widen)); |
duke@435 | 993 | #ifdef ASSERT |
duke@435 | 994 | // Make sure we get the sign-capture idiom correct. |
duke@435 | 995 | if (shift == BitsPerJavaInteger-1) { |
duke@435 | 996 | if (r1->_lo >= 0) assert(ti == TypeInt::ZERO, ">>31 of + is 0"); |
duke@435 | 997 | if (r1->_hi < 0) assert(ti == TypeInt::MINUS_1, ">>31 of - is -1"); |
duke@435 | 998 | } |
duke@435 | 999 | #endif |
duke@435 | 1000 | return ti; |
duke@435 | 1001 | } |
duke@435 | 1002 | |
duke@435 | 1003 | if( !r1->is_con() || !r2->is_con() ) |
duke@435 | 1004 | return TypeInt::INT; |
duke@435 | 1005 | |
duke@435 | 1006 | // Signed shift right |
duke@435 | 1007 | return TypeInt::make( r1->get_con() >> (r2->get_con()&31) ); |
duke@435 | 1008 | } |
duke@435 | 1009 | |
duke@435 | 1010 | //============================================================================= |
duke@435 | 1011 | //------------------------------Identity--------------------------------------- |
duke@435 | 1012 | Node *RShiftLNode::Identity( PhaseTransform *phase ) { |
duke@435 | 1013 | const TypeInt *ti = phase->type( in(2) )->isa_int(); // shift count is an int |
duke@435 | 1014 | return ( ti && ti->is_con() && ( ti->get_con() & ( BitsPerLong - 1 ) ) == 0 ) ? in(1) : this; |
duke@435 | 1015 | } |
duke@435 | 1016 | |
duke@435 | 1017 | //------------------------------Value------------------------------------------ |
duke@435 | 1018 | // A RShiftLNode shifts its input2 right by input1 amount. |
duke@435 | 1019 | const Type *RShiftLNode::Value( PhaseTransform *phase ) const { |
duke@435 | 1020 | const Type *t1 = phase->type( in(1) ); |
duke@435 | 1021 | const Type *t2 = phase->type( in(2) ); |
duke@435 | 1022 | // Either input is TOP ==> the result is TOP |
duke@435 | 1023 | if( t1 == Type::TOP ) return Type::TOP; |
duke@435 | 1024 | if( t2 == Type::TOP ) return Type::TOP; |
duke@435 | 1025 | |
duke@435 | 1026 | // Left input is ZERO ==> the result is ZERO. |
duke@435 | 1027 | if( t1 == TypeLong::ZERO ) return TypeLong::ZERO; |
duke@435 | 1028 | // Shift by zero does nothing |
duke@435 | 1029 | if( t2 == TypeInt::ZERO ) return t1; |
duke@435 | 1030 | |
duke@435 | 1031 | // Either input is BOTTOM ==> the result is BOTTOM |
duke@435 | 1032 | if (t1 == Type::BOTTOM || t2 == Type::BOTTOM) |
duke@435 | 1033 | return TypeLong::LONG; |
duke@435 | 1034 | |
duke@435 | 1035 | if (t2 == TypeInt::INT) |
duke@435 | 1036 | return TypeLong::LONG; |
duke@435 | 1037 | |
duke@435 | 1038 | const TypeLong *r1 = t1->is_long(); // Handy access |
duke@435 | 1039 | const TypeInt *r2 = t2->is_int (); // Handy access |
duke@435 | 1040 | |
duke@435 | 1041 | // If the shift is a constant, just shift the bounds of the type. |
duke@435 | 1042 | // For example, if the shift is 63, we just propagate sign bits. |
duke@435 | 1043 | if (r2->is_con()) { |
duke@435 | 1044 | uint shift = r2->get_con(); |
duke@435 | 1045 | shift &= (2*BitsPerJavaInteger)-1; // semantics of Java shifts |
duke@435 | 1046 | // Shift by a multiple of 64 does nothing: |
duke@435 | 1047 | if (shift == 0) return t1; |
duke@435 | 1048 | // Calculate reasonably aggressive bounds for the result. |
duke@435 | 1049 | // This is necessary if we are to correctly type things |
duke@435 | 1050 | // like (x<<24>>24) == ((byte)x). |
duke@435 | 1051 | jlong lo = (jlong)r1->_lo >> (jlong)shift; |
duke@435 | 1052 | jlong hi = (jlong)r1->_hi >> (jlong)shift; |
duke@435 | 1053 | assert(lo <= hi, "must have valid bounds"); |
duke@435 | 1054 | const TypeLong* tl = TypeLong::make(lo, hi, MAX2(r1->_widen,r2->_widen)); |
duke@435 | 1055 | #ifdef ASSERT |
duke@435 | 1056 | // Make sure we get the sign-capture idiom correct. |
duke@435 | 1057 | if (shift == (2*BitsPerJavaInteger)-1) { |
duke@435 | 1058 | if (r1->_lo >= 0) assert(tl == TypeLong::ZERO, ">>63 of + is 0"); |
duke@435 | 1059 | if (r1->_hi < 0) assert(tl == TypeLong::MINUS_1, ">>63 of - is -1"); |
duke@435 | 1060 | } |
duke@435 | 1061 | #endif |
duke@435 | 1062 | return tl; |
duke@435 | 1063 | } |
duke@435 | 1064 | |
duke@435 | 1065 | return TypeLong::LONG; // Give up |
duke@435 | 1066 | } |
duke@435 | 1067 | |
duke@435 | 1068 | //============================================================================= |
duke@435 | 1069 | //------------------------------Identity--------------------------------------- |
duke@435 | 1070 | Node *URShiftINode::Identity( PhaseTransform *phase ) { |
duke@435 | 1071 | const TypeInt *ti = phase->type( in(2) )->isa_int(); |
duke@435 | 1072 | if ( ti && ti->is_con() && ( ti->get_con() & ( BitsPerInt - 1 ) ) == 0 ) return in(1); |
duke@435 | 1073 | |
duke@435 | 1074 | // Check for "((x << LogBytesPerWord) + (wordSize-1)) >> LogBytesPerWord" which is just "x". |
duke@435 | 1075 | // Happens during new-array length computation. |
duke@435 | 1076 | // Safe if 'x' is in the range [0..(max_int>>LogBytesPerWord)] |
duke@435 | 1077 | Node *add = in(1); |
duke@435 | 1078 | if( add->Opcode() == Op_AddI ) { |
duke@435 | 1079 | const TypeInt *t2 = phase->type(add->in(2))->isa_int(); |
duke@435 | 1080 | if( t2 && t2->is_con(wordSize - 1) && |
duke@435 | 1081 | add->in(1)->Opcode() == Op_LShiftI ) { |
duke@435 | 1082 | // Check that shift_counts are LogBytesPerWord |
duke@435 | 1083 | Node *lshift_count = add->in(1)->in(2); |
duke@435 | 1084 | const TypeInt *t_lshift_count = phase->type(lshift_count)->isa_int(); |
duke@435 | 1085 | if( t_lshift_count && t_lshift_count->is_con(LogBytesPerWord) && |
duke@435 | 1086 | t_lshift_count == phase->type(in(2)) ) { |
duke@435 | 1087 | Node *x = add->in(1)->in(1); |
duke@435 | 1088 | const TypeInt *t_x = phase->type(x)->isa_int(); |
duke@435 | 1089 | if( t_x != NULL && 0 <= t_x->_lo && t_x->_hi <= (max_jint>>LogBytesPerWord) ) { |
duke@435 | 1090 | return x; |
duke@435 | 1091 | } |
duke@435 | 1092 | } |
duke@435 | 1093 | } |
duke@435 | 1094 | } |
duke@435 | 1095 | |
duke@435 | 1096 | return (phase->type(in(2))->higher_equal(TypeInt::ZERO)) ? in(1) : this; |
duke@435 | 1097 | } |
duke@435 | 1098 | |
duke@435 | 1099 | //------------------------------Ideal------------------------------------------ |
duke@435 | 1100 | Node *URShiftINode::Ideal(PhaseGVN *phase, bool can_reshape) { |
duke@435 | 1101 | const TypeInt *t2 = phase->type( in(2) )->isa_int(); |
duke@435 | 1102 | if( !t2 || !t2->is_con() ) return NULL; // Right input is a constant |
duke@435 | 1103 | const int con = t2->get_con() & 31; // Shift count is always masked |
duke@435 | 1104 | if ( con == 0 ) return NULL; // let Identity() handle a 0 shift count |
duke@435 | 1105 | // We'll be wanting the right-shift amount as a mask of that many bits |
duke@435 | 1106 | const int mask = right_n_bits(BitsPerJavaInteger - con); |
duke@435 | 1107 | |
duke@435 | 1108 | int in1_op = in(1)->Opcode(); |
duke@435 | 1109 | |
duke@435 | 1110 | // Check for ((x>>>a)>>>b) and replace with (x>>>(a+b)) when a+b < 32 |
duke@435 | 1111 | if( in1_op == Op_URShiftI ) { |
duke@435 | 1112 | const TypeInt *t12 = phase->type( in(1)->in(2) )->isa_int(); |
duke@435 | 1113 | if( t12 && t12->is_con() ) { // Right input is a constant |
duke@435 | 1114 | assert( in(1) != in(1)->in(1), "dead loop in URShiftINode::Ideal" ); |
duke@435 | 1115 | const int con2 = t12->get_con() & 31; // Shift count is always masked |
duke@435 | 1116 | const int con3 = con+con2; |
duke@435 | 1117 | if( con3 < 32 ) // Only merge shifts if total is < 32 |
kvn@4115 | 1118 | return new (phase->C) URShiftINode( in(1)->in(1), phase->intcon(con3) ); |
duke@435 | 1119 | } |
duke@435 | 1120 | } |
duke@435 | 1121 | |
duke@435 | 1122 | // Check for ((x << z) + Y) >>> z. Replace with x + con>>>z |
duke@435 | 1123 | // The idiom for rounding to a power of 2 is "(Q+(2^z-1)) >>> z". |
duke@435 | 1124 | // If Q is "X << z" the rounding is useless. Look for patterns like |
duke@435 | 1125 | // ((X<<Z) + Y) >>> Z and replace with (X + Y>>>Z) & Z-mask. |
duke@435 | 1126 | Node *add = in(1); |
duke@435 | 1127 | if( in1_op == Op_AddI ) { |
duke@435 | 1128 | Node *lshl = add->in(1); |
duke@435 | 1129 | if( lshl->Opcode() == Op_LShiftI && |
duke@435 | 1130 | phase->type(lshl->in(2)) == t2 ) { |
kvn@4115 | 1131 | Node *y_z = phase->transform( new (phase->C) URShiftINode(add->in(2),in(2)) ); |
kvn@4115 | 1132 | Node *sum = phase->transform( new (phase->C) AddINode( lshl->in(1), y_z ) ); |
kvn@4115 | 1133 | return new (phase->C) AndINode( sum, phase->intcon(mask) ); |
duke@435 | 1134 | } |
duke@435 | 1135 | } |
duke@435 | 1136 | |
duke@435 | 1137 | // Check for (x & mask) >>> z. Replace with (x >>> z) & (mask >>> z) |
duke@435 | 1138 | // This shortens the mask. Also, if we are extracting a high byte and |
duke@435 | 1139 | // storing it to a buffer, the mask will be removed completely. |
duke@435 | 1140 | Node *andi = in(1); |
duke@435 | 1141 | if( in1_op == Op_AndI ) { |
duke@435 | 1142 | const TypeInt *t3 = phase->type( andi->in(2) )->isa_int(); |
duke@435 | 1143 | if( t3 && t3->is_con() ) { // Right input is a constant |
duke@435 | 1144 | jint mask2 = t3->get_con(); |
duke@435 | 1145 | mask2 >>= con; // *signed* shift downward (high-order zeroes do not help) |
kvn@4115 | 1146 | Node *newshr = phase->transform( new (phase->C) URShiftINode(andi->in(1), in(2)) ); |
kvn@4115 | 1147 | return new (phase->C) AndINode(newshr, phase->intcon(mask2)); |
duke@435 | 1148 | // The negative values are easier to materialize than positive ones. |
duke@435 | 1149 | // A typical case from address arithmetic is ((x & ~15) >> 4). |
duke@435 | 1150 | // It's better to change that to ((x >> 4) & ~0) versus |
duke@435 | 1151 | // ((x >> 4) & 0x0FFFFFFF). The difference is greatest in LP64. |
duke@435 | 1152 | } |
duke@435 | 1153 | } |
duke@435 | 1154 | |
duke@435 | 1155 | // Check for "(X << z ) >>> z" which simply zero-extends |
duke@435 | 1156 | Node *shl = in(1); |
duke@435 | 1157 | if( in1_op == Op_LShiftI && |
duke@435 | 1158 | phase->type(shl->in(2)) == t2 ) |
kvn@4115 | 1159 | return new (phase->C) AndINode( shl->in(1), phase->intcon(mask) ); |
duke@435 | 1160 | |
duke@435 | 1161 | return NULL; |
duke@435 | 1162 | } |
duke@435 | 1163 | |
duke@435 | 1164 | //------------------------------Value------------------------------------------ |
duke@435 | 1165 | // A URShiftINode shifts its input2 right by input1 amount. |
duke@435 | 1166 | const Type *URShiftINode::Value( PhaseTransform *phase ) const { |
duke@435 | 1167 | // (This is a near clone of RShiftINode::Value.) |
duke@435 | 1168 | const Type *t1 = phase->type( in(1) ); |
duke@435 | 1169 | const Type *t2 = phase->type( in(2) ); |
duke@435 | 1170 | // Either input is TOP ==> the result is TOP |
duke@435 | 1171 | if( t1 == Type::TOP ) return Type::TOP; |
duke@435 | 1172 | if( t2 == Type::TOP ) return Type::TOP; |
duke@435 | 1173 | |
duke@435 | 1174 | // Left input is ZERO ==> the result is ZERO. |
duke@435 | 1175 | if( t1 == TypeInt::ZERO ) return TypeInt::ZERO; |
duke@435 | 1176 | // Shift by zero does nothing |
duke@435 | 1177 | if( t2 == TypeInt::ZERO ) return t1; |
duke@435 | 1178 | |
duke@435 | 1179 | // Either input is BOTTOM ==> the result is BOTTOM |
duke@435 | 1180 | if (t1 == Type::BOTTOM || t2 == Type::BOTTOM) |
duke@435 | 1181 | return TypeInt::INT; |
duke@435 | 1182 | |
duke@435 | 1183 | if (t2 == TypeInt::INT) |
duke@435 | 1184 | return TypeInt::INT; |
duke@435 | 1185 | |
duke@435 | 1186 | const TypeInt *r1 = t1->is_int(); // Handy access |
duke@435 | 1187 | const TypeInt *r2 = t2->is_int(); // Handy access |
duke@435 | 1188 | |
duke@435 | 1189 | if (r2->is_con()) { |
duke@435 | 1190 | uint shift = r2->get_con(); |
duke@435 | 1191 | shift &= BitsPerJavaInteger-1; // semantics of Java shifts |
duke@435 | 1192 | // Shift by a multiple of 32 does nothing: |
duke@435 | 1193 | if (shift == 0) return t1; |
duke@435 | 1194 | // Calculate reasonably aggressive bounds for the result. |
duke@435 | 1195 | jint lo = (juint)r1->_lo >> (juint)shift; |
duke@435 | 1196 | jint hi = (juint)r1->_hi >> (juint)shift; |
duke@435 | 1197 | if (r1->_hi >= 0 && r1->_lo < 0) { |
duke@435 | 1198 | // If the type has both negative and positive values, |
duke@435 | 1199 | // there are two separate sub-domains to worry about: |
duke@435 | 1200 | // The positive half and the negative half. |
duke@435 | 1201 | jint neg_lo = lo; |
duke@435 | 1202 | jint neg_hi = (juint)-1 >> (juint)shift; |
duke@435 | 1203 | jint pos_lo = (juint) 0 >> (juint)shift; |
duke@435 | 1204 | jint pos_hi = hi; |
duke@435 | 1205 | lo = MIN2(neg_lo, pos_lo); // == 0 |
duke@435 | 1206 | hi = MAX2(neg_hi, pos_hi); // == -1 >>> shift; |
duke@435 | 1207 | } |
duke@435 | 1208 | assert(lo <= hi, "must have valid bounds"); |
duke@435 | 1209 | const TypeInt* ti = TypeInt::make(lo, hi, MAX2(r1->_widen,r2->_widen)); |
duke@435 | 1210 | #ifdef ASSERT |
duke@435 | 1211 | // Make sure we get the sign-capture idiom correct. |
duke@435 | 1212 | if (shift == BitsPerJavaInteger-1) { |
duke@435 | 1213 | if (r1->_lo >= 0) assert(ti == TypeInt::ZERO, ">>>31 of + is 0"); |
duke@435 | 1214 | if (r1->_hi < 0) assert(ti == TypeInt::ONE, ">>>31 of - is +1"); |
duke@435 | 1215 | } |
duke@435 | 1216 | #endif |
duke@435 | 1217 | return ti; |
duke@435 | 1218 | } |
duke@435 | 1219 | |
duke@435 | 1220 | // |
duke@435 | 1221 | // Do not support shifted oops in info for GC |
duke@435 | 1222 | // |
duke@435 | 1223 | // else if( t1->base() == Type::InstPtr ) { |
duke@435 | 1224 | // |
duke@435 | 1225 | // const TypeInstPtr *o = t1->is_instptr(); |
duke@435 | 1226 | // if( t1->singleton() ) |
duke@435 | 1227 | // return TypeInt::make( ((uint32)o->const_oop() + o->_offset) >> shift ); |
duke@435 | 1228 | // } |
duke@435 | 1229 | // else if( t1->base() == Type::KlassPtr ) { |
duke@435 | 1230 | // const TypeKlassPtr *o = t1->is_klassptr(); |
duke@435 | 1231 | // if( t1->singleton() ) |
duke@435 | 1232 | // return TypeInt::make( ((uint32)o->const_oop() + o->_offset) >> shift ); |
duke@435 | 1233 | // } |
duke@435 | 1234 | |
duke@435 | 1235 | return TypeInt::INT; |
duke@435 | 1236 | } |
duke@435 | 1237 | |
duke@435 | 1238 | //============================================================================= |
duke@435 | 1239 | //------------------------------Identity--------------------------------------- |
duke@435 | 1240 | Node *URShiftLNode::Identity( PhaseTransform *phase ) { |
duke@435 | 1241 | const TypeInt *ti = phase->type( in(2) )->isa_int(); // shift count is an int |
duke@435 | 1242 | return ( ti && ti->is_con() && ( ti->get_con() & ( BitsPerLong - 1 ) ) == 0 ) ? in(1) : this; |
duke@435 | 1243 | } |
duke@435 | 1244 | |
duke@435 | 1245 | //------------------------------Ideal------------------------------------------ |
duke@435 | 1246 | Node *URShiftLNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
duke@435 | 1247 | const TypeInt *t2 = phase->type( in(2) )->isa_int(); |
duke@435 | 1248 | if( !t2 || !t2->is_con() ) return NULL; // Right input is a constant |
duke@435 | 1249 | const int con = t2->get_con() & ( BitsPerLong - 1 ); // Shift count is always masked |
duke@435 | 1250 | if ( con == 0 ) return NULL; // let Identity() handle a 0 shift count |
duke@435 | 1251 | // note: mask computation below does not work for 0 shift count |
duke@435 | 1252 | // We'll be wanting the right-shift amount as a mask of that many bits |
twisti@994 | 1253 | const jlong mask = (((jlong)CONST64(1) << (jlong)(BitsPerJavaLong - con)) -1); |
duke@435 | 1254 | |
duke@435 | 1255 | // Check for ((x << z) + Y) >>> z. Replace with x + con>>>z |
duke@435 | 1256 | // The idiom for rounding to a power of 2 is "(Q+(2^z-1)) >>> z". |
duke@435 | 1257 | // If Q is "X << z" the rounding is useless. Look for patterns like |
duke@435 | 1258 | // ((X<<Z) + Y) >>> Z and replace with (X + Y>>>Z) & Z-mask. |
duke@435 | 1259 | Node *add = in(1); |
duke@435 | 1260 | if( add->Opcode() == Op_AddL ) { |
duke@435 | 1261 | Node *lshl = add->in(1); |
duke@435 | 1262 | if( lshl->Opcode() == Op_LShiftL && |
duke@435 | 1263 | phase->type(lshl->in(2)) == t2 ) { |
kvn@4115 | 1264 | Node *y_z = phase->transform( new (phase->C) URShiftLNode(add->in(2),in(2)) ); |
kvn@4115 | 1265 | Node *sum = phase->transform( new (phase->C) AddLNode( lshl->in(1), y_z ) ); |
kvn@4115 | 1266 | return new (phase->C) AndLNode( sum, phase->longcon(mask) ); |
duke@435 | 1267 | } |
duke@435 | 1268 | } |
duke@435 | 1269 | |
duke@435 | 1270 | // Check for (x & mask) >>> z. Replace with (x >>> z) & (mask >>> z) |
duke@435 | 1271 | // This shortens the mask. Also, if we are extracting a high byte and |
duke@435 | 1272 | // storing it to a buffer, the mask will be removed completely. |
duke@435 | 1273 | Node *andi = in(1); |
duke@435 | 1274 | if( andi->Opcode() == Op_AndL ) { |
duke@435 | 1275 | const TypeLong *t3 = phase->type( andi->in(2) )->isa_long(); |
duke@435 | 1276 | if( t3 && t3->is_con() ) { // Right input is a constant |
duke@435 | 1277 | jlong mask2 = t3->get_con(); |
duke@435 | 1278 | mask2 >>= con; // *signed* shift downward (high-order zeroes do not help) |
kvn@4115 | 1279 | Node *newshr = phase->transform( new (phase->C) URShiftLNode(andi->in(1), in(2)) ); |
kvn@4115 | 1280 | return new (phase->C) AndLNode(newshr, phase->longcon(mask2)); |
duke@435 | 1281 | } |
duke@435 | 1282 | } |
duke@435 | 1283 | |
duke@435 | 1284 | // Check for "(X << z ) >>> z" which simply zero-extends |
duke@435 | 1285 | Node *shl = in(1); |
duke@435 | 1286 | if( shl->Opcode() == Op_LShiftL && |
duke@435 | 1287 | phase->type(shl->in(2)) == t2 ) |
kvn@4115 | 1288 | return new (phase->C) AndLNode( shl->in(1), phase->longcon(mask) ); |
duke@435 | 1289 | |
duke@435 | 1290 | return NULL; |
duke@435 | 1291 | } |
duke@435 | 1292 | |
duke@435 | 1293 | //------------------------------Value------------------------------------------ |
duke@435 | 1294 | // A URShiftINode shifts its input2 right by input1 amount. |
duke@435 | 1295 | const Type *URShiftLNode::Value( PhaseTransform *phase ) const { |
duke@435 | 1296 | // (This is a near clone of RShiftLNode::Value.) |
duke@435 | 1297 | const Type *t1 = phase->type( in(1) ); |
duke@435 | 1298 | const Type *t2 = phase->type( in(2) ); |
duke@435 | 1299 | // Either input is TOP ==> the result is TOP |
duke@435 | 1300 | if( t1 == Type::TOP ) return Type::TOP; |
duke@435 | 1301 | if( t2 == Type::TOP ) return Type::TOP; |
duke@435 | 1302 | |
duke@435 | 1303 | // Left input is ZERO ==> the result is ZERO. |
duke@435 | 1304 | if( t1 == TypeLong::ZERO ) return TypeLong::ZERO; |
duke@435 | 1305 | // Shift by zero does nothing |
duke@435 | 1306 | if( t2 == TypeInt::ZERO ) return t1; |
duke@435 | 1307 | |
duke@435 | 1308 | // Either input is BOTTOM ==> the result is BOTTOM |
duke@435 | 1309 | if (t1 == Type::BOTTOM || t2 == Type::BOTTOM) |
duke@435 | 1310 | return TypeLong::LONG; |
duke@435 | 1311 | |
duke@435 | 1312 | if (t2 == TypeInt::INT) |
duke@435 | 1313 | return TypeLong::LONG; |
duke@435 | 1314 | |
duke@435 | 1315 | const TypeLong *r1 = t1->is_long(); // Handy access |
duke@435 | 1316 | const TypeInt *r2 = t2->is_int (); // Handy access |
duke@435 | 1317 | |
duke@435 | 1318 | if (r2->is_con()) { |
duke@435 | 1319 | uint shift = r2->get_con(); |
twisti@994 | 1320 | shift &= BitsPerJavaLong - 1; // semantics of Java shifts |
duke@435 | 1321 | // Shift by a multiple of 64 does nothing: |
duke@435 | 1322 | if (shift == 0) return t1; |
duke@435 | 1323 | // Calculate reasonably aggressive bounds for the result. |
duke@435 | 1324 | jlong lo = (julong)r1->_lo >> (juint)shift; |
duke@435 | 1325 | jlong hi = (julong)r1->_hi >> (juint)shift; |
duke@435 | 1326 | if (r1->_hi >= 0 && r1->_lo < 0) { |
duke@435 | 1327 | // If the type has both negative and positive values, |
duke@435 | 1328 | // there are two separate sub-domains to worry about: |
duke@435 | 1329 | // The positive half and the negative half. |
duke@435 | 1330 | jlong neg_lo = lo; |
duke@435 | 1331 | jlong neg_hi = (julong)-1 >> (juint)shift; |
duke@435 | 1332 | jlong pos_lo = (julong) 0 >> (juint)shift; |
duke@435 | 1333 | jlong pos_hi = hi; |
duke@435 | 1334 | //lo = MIN2(neg_lo, pos_lo); // == 0 |
duke@435 | 1335 | lo = neg_lo < pos_lo ? neg_lo : pos_lo; |
duke@435 | 1336 | //hi = MAX2(neg_hi, pos_hi); // == -1 >>> shift; |
duke@435 | 1337 | hi = neg_hi > pos_hi ? neg_hi : pos_hi; |
duke@435 | 1338 | } |
duke@435 | 1339 | assert(lo <= hi, "must have valid bounds"); |
duke@435 | 1340 | const TypeLong* tl = TypeLong::make(lo, hi, MAX2(r1->_widen,r2->_widen)); |
duke@435 | 1341 | #ifdef ASSERT |
duke@435 | 1342 | // Make sure we get the sign-capture idiom correct. |
twisti@994 | 1343 | if (shift == BitsPerJavaLong - 1) { |
duke@435 | 1344 | if (r1->_lo >= 0) assert(tl == TypeLong::ZERO, ">>>63 of + is 0"); |
duke@435 | 1345 | if (r1->_hi < 0) assert(tl == TypeLong::ONE, ">>>63 of - is +1"); |
duke@435 | 1346 | } |
duke@435 | 1347 | #endif |
duke@435 | 1348 | return tl; |
duke@435 | 1349 | } |
duke@435 | 1350 | |
duke@435 | 1351 | return TypeLong::LONG; // Give up |
duke@435 | 1352 | } |