Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/lcm.cpp @ 14435:da862781b584
Merge
| author | kvn |
|---|---|
| date | Thu, 21 Nov 2013 12:30:35 -0800 |
| parents | 2b8e28fdf503 |
| children | b0133e4187d3 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "memory/allocation.inline.hpp" | |
| 27 #include "opto/block.hpp" | |
| 28 #include "opto/c2compiler.hpp" | |
| 29 #include "opto/callnode.hpp" | |
| 30 #include "opto/cfgnode.hpp" | |
| 31 #include "opto/machnode.hpp" | |
| 32 #include "opto/runtime.hpp" | |
| 33 #ifdef TARGET_ARCH_MODEL_x86_32 | |
| 34 # include "adfiles/ad_x86_32.hpp" | |
| 35 #endif | |
| 36 #ifdef TARGET_ARCH_MODEL_x86_64 | |
| 37 # include "adfiles/ad_x86_64.hpp" | |
| 38 #endif | |
| 39 #ifdef TARGET_ARCH_MODEL_sparc | |
| 40 # include "adfiles/ad_sparc.hpp" | |
| 41 #endif | |
| 42 #ifdef TARGET_ARCH_MODEL_zero | |
| 43 # include "adfiles/ad_zero.hpp" | |
| 44 #endif | |
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45 #ifdef TARGET_ARCH_MODEL_arm |
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46 # include "adfiles/ad_arm.hpp" |
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47 #endif |
| 14391 | 48 #ifdef TARGET_ARCH_MODEL_ppc_32 |
| 49 # include "adfiles/ad_ppc_32.hpp" | |
| 50 #endif | |
| 51 #ifdef TARGET_ARCH_MODEL_ppc_64 | |
| 52 # include "adfiles/ad_ppc_64.hpp" | |
| 3796 | 53 #endif |
| 0 | 54 |
| 1972 | 55 // Optimization - Graph Style |
| 0 | 56 |
| 57 //------------------------------implicit_null_check---------------------------- | |
| 58 // Detect implicit-null-check opportunities. Basically, find NULL checks | |
| 59 // with suitable memory ops nearby. Use the memory op to do the NULL check. | |
| 60 // I can generate a memory op if there is not one nearby. | |
| 61 // The proj is the control projection for the not-null case. | |
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62 // The val is the pointer being checked for nullness or |
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63 // decodeHeapOop_not_null node if it did not fold into address. |
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64 void PhaseCFG::implicit_null_check(Block* block, Node *proj, Node *val, int allowed_reasons) { |
| 0 | 65 // Assume if null check need for 0 offset then always needed |
| 66 // Intel solaris doesn't support any null checks yet and no | |
| 67 // mechanism exists (yet) to set the switches at an os_cpu level | |
| 68 if( !ImplicitNullChecks || MacroAssembler::needs_explicit_null_check(0)) return; | |
| 69 | |
| 70 // Make sure the ptr-is-null path appears to be uncommon! | |
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71 float f = block->end()->as_MachIf()->_prob; |
| 0 | 72 if( proj->Opcode() == Op_IfTrue ) f = 1.0f - f; |
| 73 if( f > PROB_UNLIKELY_MAG(4) ) return; | |
| 74 | |
| 75 uint bidx = 0; // Capture index of value into memop | |
| 76 bool was_store; // Memory op is a store op | |
| 77 | |
| 78 // Get the successor block for if the test ptr is non-null | |
| 79 Block* not_null_block; // this one goes with the proj | |
| 80 Block* null_block; | |
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81 if (block->get_node(block->number_of_nodes()-1) == proj) { |
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82 null_block = block->_succs[0]; |
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83 not_null_block = block->_succs[1]; |
| 0 | 84 } else { |
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85 assert(block->get_node(block->number_of_nodes()-2) == proj, "proj is one or the other"); |
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86 not_null_block = block->_succs[0]; |
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87 null_block = block->_succs[1]; |
| 0 | 88 } |
| 332 | 89 while (null_block->is_Empty() == Block::empty_with_goto) { |
| 90 null_block = null_block->_succs[0]; | |
| 91 } | |
| 0 | 92 |
| 93 // Search the exception block for an uncommon trap. | |
| 94 // (See Parse::do_if and Parse::do_ifnull for the reason | |
| 95 // we need an uncommon trap. Briefly, we need a way to | |
| 96 // detect failure of this optimization, as in 6366351.) | |
| 97 { | |
| 98 bool found_trap = false; | |
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99 for (uint i1 = 0; i1 < null_block->number_of_nodes(); i1++) { |
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100 Node* nn = null_block->get_node(i1); |
| 0 | 101 if (nn->is_MachCall() && |
| 1748 | 102 nn->as_MachCall()->entry_point() == SharedRuntime::uncommon_trap_blob()->entry_point()) { |
| 0 | 103 const Type* trtype = nn->in(TypeFunc::Parms)->bottom_type(); |
| 104 if (trtype->isa_int() && trtype->is_int()->is_con()) { | |
| 105 jint tr_con = trtype->is_int()->get_con(); | |
| 106 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(tr_con); | |
| 107 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(tr_con); | |
| 108 assert((int)reason < (int)BitsPerInt, "recode bit map"); | |
| 109 if (is_set_nth_bit(allowed_reasons, (int) reason) | |
| 110 && action != Deoptimization::Action_none) { | |
| 111 // This uncommon trap is sure to recompile, eventually. | |
| 112 // When that happens, C->too_many_traps will prevent | |
| 113 // this transformation from happening again. | |
| 114 found_trap = true; | |
| 115 } | |
| 116 } | |
| 117 break; | |
| 118 } | |
| 119 } | |
| 120 if (!found_trap) { | |
| 121 // We did not find an uncommon trap. | |
| 122 return; | |
| 123 } | |
| 124 } | |
| 125 | |
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126 // Check for decodeHeapOop_not_null node which did not fold into address |
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127 bool is_decoden = ((intptr_t)val) & 1; |
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128 val = (Node*)(((intptr_t)val) & ~1); |
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129 |
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130 assert(!is_decoden || (val->in(0) == NULL) && val->is_Mach() && |
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131 (val->as_Mach()->ideal_Opcode() == Op_DecodeN), "sanity"); |
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132 |
| 0 | 133 // Search the successor block for a load or store who's base value is also |
| 134 // the tested value. There may be several. | |
| 135 Node_List *out = new Node_List(Thread::current()->resource_area()); | |
| 136 MachNode *best = NULL; // Best found so far | |
| 137 for (DUIterator i = val->outs(); val->has_out(i); i++) { | |
| 138 Node *m = val->out(i); | |
| 139 if( !m->is_Mach() ) continue; | |
| 140 MachNode *mach = m->as_Mach(); | |
| 141 was_store = false; | |
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142 int iop = mach->ideal_Opcode(); |
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143 switch( iop ) { |
| 0 | 144 case Op_LoadB: |
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145 case Op_LoadUB: |
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146 case Op_LoadUS: |
| 0 | 147 case Op_LoadD: |
| 148 case Op_LoadF: | |
| 149 case Op_LoadI: | |
| 150 case Op_LoadL: | |
| 151 case Op_LoadP: | |
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152 case Op_LoadN: |
| 0 | 153 case Op_LoadS: |
| 154 case Op_LoadKlass: | |
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155 case Op_LoadNKlass: |
| 0 | 156 case Op_LoadRange: |
| 157 case Op_LoadD_unaligned: | |
| 158 case Op_LoadL_unaligned: | |
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159 assert(mach->in(2) == val, "should be address"); |
| 0 | 160 break; |
| 161 case Op_StoreB: | |
| 162 case Op_StoreC: | |
| 163 case Op_StoreCM: | |
| 164 case Op_StoreD: | |
| 165 case Op_StoreF: | |
| 166 case Op_StoreI: | |
| 167 case Op_StoreL: | |
| 168 case Op_StoreP: | |
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169 case Op_StoreN: |
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170 case Op_StoreNKlass: |
| 0 | 171 was_store = true; // Memory op is a store op |
| 172 // Stores will have their address in slot 2 (memory in slot 1). | |
| 173 // If the value being nul-checked is in another slot, it means we | |
| 174 // are storing the checked value, which does NOT check the value! | |
| 175 if( mach->in(2) != val ) continue; | |
| 176 break; // Found a memory op? | |
| 177 case Op_StrComp: | |
| 681 | 178 case Op_StrEquals: |
| 179 case Op_StrIndexOf: | |
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180 case Op_AryEq: |
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181 case Op_EncodeISOArray: |
| 0 | 182 // Not a legit memory op for implicit null check regardless of |
| 183 // embedded loads | |
| 184 continue; | |
| 185 default: // Also check for embedded loads | |
| 186 if( !mach->needs_anti_dependence_check() ) | |
| 187 continue; // Not an memory op; skip it | |
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188 if( must_clone[iop] ) { |
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189 // Do not move nodes which produce flags because |
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190 // RA will try to clone it to place near branch and |
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191 // it will cause recompilation, see clone_node(). |
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192 continue; |
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193 } |
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194 { |
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195 // Check that value is used in memory address in |
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196 // instructions with embedded load (CmpP val1,(val2+off)). |
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197 Node* base; |
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198 Node* index; |
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199 const MachOper* oper = mach->memory_inputs(base, index); |
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200 if (oper == NULL || oper == (MachOper*)-1) { |
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201 continue; // Not an memory op; skip it |
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202 } |
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203 if (val == base || |
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204 val == index && val->bottom_type()->isa_narrowoop()) { |
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205 break; // Found it |
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206 } else { |
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207 continue; // Skip it |
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208 } |
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209 } |
| 0 | 210 break; |
| 211 } | |
| 212 // check if the offset is not too high for implicit exception | |
| 213 { | |
| 214 intptr_t offset = 0; | |
| 215 const TypePtr *adr_type = NULL; // Do not need this return value here | |
| 216 const Node* base = mach->get_base_and_disp(offset, adr_type); | |
| 217 if (base == NULL || base == NodeSentinel) { | |
| 332 | 218 // Narrow oop address doesn't have base, only index |
| 219 if( val->bottom_type()->isa_narrowoop() && | |
| 220 MacroAssembler::needs_explicit_null_check(offset) ) | |
| 221 continue; // Give up if offset is beyond page size | |
| 0 | 222 // cannot reason about it; is probably not implicit null exception |
| 223 } else { | |
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224 const TypePtr* tptr; |
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225 if (UseCompressedOops && (Universe::narrow_oop_shift() == 0 || |
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226 Universe::narrow_klass_shift() == 0)) { |
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227 // 32-bits narrow oop can be the base of address expressions |
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228 tptr = base->get_ptr_type(); |
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229 } else { |
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230 // only regular oops are expected here |
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231 tptr = base->bottom_type()->is_ptr(); |
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232 } |
| 0 | 233 // Give up if offset is not a compile-time constant |
| 234 if( offset == Type::OffsetBot || tptr->_offset == Type::OffsetBot ) | |
| 235 continue; | |
| 236 offset += tptr->_offset; // correct if base is offseted | |
| 237 if( MacroAssembler::needs_explicit_null_check(offset) ) | |
| 238 continue; // Give up is reference is beyond 4K page size | |
| 239 } | |
| 240 } | |
| 241 | |
| 242 // Check ctrl input to see if the null-check dominates the memory op | |
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243 Block *cb = get_block_for_node(mach); |
| 0 | 244 cb = cb->_idom; // Always hoist at least 1 block |
| 245 if( !was_store ) { // Stores can be hoisted only one block | |
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246 while( cb->_dom_depth > (block->_dom_depth + 1)) |
| 0 | 247 cb = cb->_idom; // Hoist loads as far as we want |
| 248 // The non-null-block should dominate the memory op, too. Live | |
| 249 // range spilling will insert a spill in the non-null-block if it is | |
| 250 // needs to spill the memory op for an implicit null check. | |
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251 if (cb->_dom_depth == (block->_dom_depth + 1)) { |
| 0 | 252 if (cb != not_null_block) continue; |
| 253 cb = cb->_idom; | |
| 254 } | |
| 255 } | |
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256 if( cb != block ) continue; |
| 0 | 257 |
| 258 // Found a memory user; see if it can be hoisted to check-block | |
| 259 uint vidx = 0; // Capture index of value into memop | |
| 260 uint j; | |
| 261 for( j = mach->req()-1; j > 0; j-- ) { | |
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262 if( mach->in(j) == val ) { |
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263 vidx = j; |
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264 // Ignore DecodeN val which could be hoisted to where needed. |
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265 if( is_decoden ) continue; |
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266 } |
| 0 | 267 // Block of memory-op input |
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268 Block *inb = get_block_for_node(mach->in(j)); |
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269 Block *b = block; // Start from nul check |
| 0 | 270 while( b != inb && b->_dom_depth > inb->_dom_depth ) |
| 271 b = b->_idom; // search upwards for input | |
| 272 // See if input dominates null check | |
| 273 if( b != inb ) | |
| 274 break; | |
| 275 } | |
| 276 if( j > 0 ) | |
| 277 continue; | |
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278 Block *mb = get_block_for_node(mach); |
| 0 | 279 // Hoisting stores requires more checks for the anti-dependence case. |
| 280 // Give up hoisting if we have to move the store past any load. | |
| 281 if( was_store ) { | |
| 282 Block *b = mb; // Start searching here for a local load | |
| 283 // mach use (faulting) trying to hoist | |
| 284 // n might be blocker to hoisting | |
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285 while( b != block ) { |
| 0 | 286 uint k; |
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287 for( k = 1; k < b->number_of_nodes(); k++ ) { |
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288 Node *n = b->get_node(k); |
| 0 | 289 if( n->needs_anti_dependence_check() && |
| 290 n->in(LoadNode::Memory) == mach->in(StoreNode::Memory) ) | |
| 291 break; // Found anti-dependent load | |
| 292 } | |
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293 if( k < b->number_of_nodes() ) |
| 0 | 294 break; // Found anti-dependent load |
| 295 // Make sure control does not do a merge (would have to check allpaths) | |
| 296 if( b->num_preds() != 2 ) break; | |
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297 b = get_block_for_node(b->pred(1)); // Move up to predecessor block |
| 0 | 298 } |
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299 if( b != block ) continue; |
| 0 | 300 } |
| 301 | |
| 302 // Make sure this memory op is not already being used for a NullCheck | |
| 303 Node *e = mb->end(); | |
| 304 if( e->is_MachNullCheck() && e->in(1) == mach ) | |
| 305 continue; // Already being used as a NULL check | |
| 306 | |
| 307 // Found a candidate! Pick one with least dom depth - the highest | |
| 308 // in the dom tree should be closest to the null check. | |
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309 if (best == NULL || get_block_for_node(mach)->_dom_depth < get_block_for_node(best)->_dom_depth) { |
| 0 | 310 best = mach; |
| 311 bidx = vidx; | |
| 312 } | |
| 313 } | |
| 314 // No candidate! | |
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315 if (best == NULL) { |
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316 return; |
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317 } |
| 0 | 318 |
| 319 // ---- Found an implicit null check | |
| 320 extern int implicit_null_checks; | |
| 321 implicit_null_checks++; | |
| 322 | |
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323 if( is_decoden ) { |
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324 // Check if we need to hoist decodeHeapOop_not_null first. |
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325 Block *valb = get_block_for_node(val); |
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326 if( block != valb && block->_dom_depth < valb->_dom_depth ) { |
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327 // Hoist it up to the end of the test block. |
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328 valb->find_remove(val); |
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329 block->add_inst(val); |
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330 map_node_to_block(val, block); |
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331 // DecodeN on x86 may kill flags. Check for flag-killing projections |
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332 // that also need to be hoisted. |
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333 for (DUIterator_Fast jmax, j = val->fast_outs(jmax); j < jmax; j++) { |
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334 Node* n = val->fast_out(j); |
| 3842 | 335 if( n->is_MachProj() ) { |
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336 get_block_for_node(n)->find_remove(n); |
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337 block->add_inst(n); |
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338 map_node_to_block(n, block); |
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339 } |
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340 } |
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341 } |
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342 } |
| 0 | 343 // Hoist the memory candidate up to the end of the test block. |
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344 Block *old_block = get_block_for_node(best); |
| 0 | 345 old_block->find_remove(best); |
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346 block->add_inst(best); |
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347 map_node_to_block(best, block); |
| 0 | 348 |
| 349 // Move the control dependence | |
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350 if (best->in(0) && best->in(0) == old_block->head()) |
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351 best->set_req(0, block->head()); |
| 0 | 352 |
| 353 // Check for flag-killing projections that also need to be hoisted | |
| 354 // Should be DU safe because no edge updates. | |
| 355 for (DUIterator_Fast jmax, j = best->fast_outs(jmax); j < jmax; j++) { | |
| 356 Node* n = best->fast_out(j); | |
| 3842 | 357 if( n->is_MachProj() ) { |
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358 get_block_for_node(n)->find_remove(n); |
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359 block->add_inst(n); |
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360 map_node_to_block(n, block); |
| 0 | 361 } |
| 362 } | |
| 363 | |
| 364 // proj==Op_True --> ne test; proj==Op_False --> eq test. | |
| 365 // One of two graph shapes got matched: | |
| 366 // (IfTrue (If (Bool NE (CmpP ptr NULL)))) | |
| 367 // (IfFalse (If (Bool EQ (CmpP ptr NULL)))) | |
| 368 // NULL checks are always branch-if-eq. If we see a IfTrue projection | |
| 369 // then we are replacing a 'ne' test with a 'eq' NULL check test. | |
| 370 // We need to flip the projections to keep the same semantics. | |
| 371 if( proj->Opcode() == Op_IfTrue ) { | |
| 372 // Swap order of projections in basic block to swap branch targets | |
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373 Node *tmp1 = block->get_node(block->end_idx()+1); |
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374 Node *tmp2 = block->get_node(block->end_idx()+2); |
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375 block->map_node(tmp2, block->end_idx()+1); |
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376 block->map_node(tmp1, block->end_idx()+2); |
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377 Node *tmp = new (C) Node(C->top()); // Use not NULL input |
| 0 | 378 tmp1->replace_by(tmp); |
| 379 tmp2->replace_by(tmp1); | |
| 380 tmp->replace_by(tmp2); | |
| 381 tmp->destruct(); | |
| 382 } | |
| 383 | |
| 384 // Remove the existing null check; use a new implicit null check instead. | |
| 385 // Since schedule-local needs precise def-use info, we need to correct | |
| 386 // it as well. | |
| 387 Node *old_tst = proj->in(0); | |
| 388 MachNode *nul_chk = new (C) MachNullCheckNode(old_tst->in(0),best,bidx); | |
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389 block->map_node(nul_chk, block->end_idx()); |
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390 map_node_to_block(nul_chk, block); |
| 0 | 391 // Redirect users of old_test to nul_chk |
| 392 for (DUIterator_Last i2min, i2 = old_tst->last_outs(i2min); i2 >= i2min; --i2) | |
| 393 old_tst->last_out(i2)->set_req(0, nul_chk); | |
| 394 // Clean-up any dead code | |
| 395 for (uint i3 = 0; i3 < old_tst->req(); i3++) | |
| 396 old_tst->set_req(i3, NULL); | |
| 397 | |
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398 latency_from_uses(nul_chk); |
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399 latency_from_uses(best); |
| 0 | 400 } |
| 401 | |
| 402 | |
| 403 //------------------------------select----------------------------------------- | |
| 404 // Select a nice fellow from the worklist to schedule next. If there is only | |
| 405 // one choice, then use it. Projections take top priority for correctness | |
| 406 // reasons - if I see a projection, then it is next. There are a number of | |
| 407 // other special cases, for instructions that consume condition codes, et al. | |
| 408 // These are chosen immediately. Some instructions are required to immediately | |
| 409 // precede the last instruction in the block, and these are taken last. Of the | |
| 410 // remaining cases (most), choose the instruction with the greatest latency | |
| 411 // (that is, the most number of pseudo-cycles required to the end of the | |
| 412 // routine). If there is a tie, choose the instruction with the most inputs. | |
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413 Node* PhaseCFG::select(Block* block, Node_List &worklist, GrowableArray<int> &ready_cnt, VectorSet &next_call, uint sched_slot) { |
| 0 | 414 |
| 415 // If only a single entry on the stack, use it | |
| 416 uint cnt = worklist.size(); | |
| 417 if (cnt == 1) { | |
| 418 Node *n = worklist[0]; | |
| 419 worklist.map(0,worklist.pop()); | |
| 420 return n; | |
| 421 } | |
| 422 | |
| 423 uint choice = 0; // Bigger is most important | |
| 424 uint latency = 0; // Bigger is scheduled first | |
| 425 uint score = 0; // Bigger is better | |
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426 int idx = -1; // Index in worklist |
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427 int cand_cnt = 0; // Candidate count |
| 0 | 428 |
| 429 for( uint i=0; i<cnt; i++ ) { // Inspect entire worklist | |
| 430 // Order in worklist is used to break ties. | |
| 431 // See caller for how this is used to delay scheduling | |
| 432 // of induction variable increments to after the other | |
| 433 // uses of the phi are scheduled. | |
| 434 Node *n = worklist[i]; // Get Node on worklist | |
| 435 | |
| 436 int iop = n->is_Mach() ? n->as_Mach()->ideal_Opcode() : 0; | |
| 437 if( n->is_Proj() || // Projections always win | |
| 438 n->Opcode()== Op_Con || // So does constant 'Top' | |
| 439 iop == Op_CreateEx || // Create-exception must start block | |
| 440 iop == Op_CheckCastPP | |
| 441 ) { | |
| 442 worklist.map(i,worklist.pop()); | |
| 443 return n; | |
| 444 } | |
| 445 | |
| 446 // Final call in a block must be adjacent to 'catch' | |
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447 Node *e = block->end(); |
| 0 | 448 if( e->is_Catch() && e->in(0)->in(0) == n ) |
| 449 continue; | |
| 450 | |
| 451 // Memory op for an implicit null check has to be at the end of the block | |
| 452 if( e->is_MachNullCheck() && e->in(1) == n ) | |
| 453 continue; | |
| 454 | |
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455 // Schedule IV increment last. |
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456 if (e->is_Mach() && e->as_Mach()->ideal_Opcode() == Op_CountedLoopEnd && |
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457 e->in(1)->in(1) == n && n->is_iteratively_computed()) |
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458 continue; |
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459 |
| 0 | 460 uint n_choice = 2; |
| 461 | |
| 462 // See if this instruction is consumed by a branch. If so, then (as the | |
| 463 // branch is the last instruction in the basic block) force it to the | |
| 464 // end of the basic block | |
| 465 if ( must_clone[iop] ) { | |
| 466 // See if any use is a branch | |
| 467 bool found_machif = false; | |
| 468 | |
| 469 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
| 470 Node* use = n->fast_out(j); | |
| 471 | |
| 472 // The use is a conditional branch, make them adjacent | |
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473 if (use->is_MachIf() && get_block_for_node(use) == block) { |
| 0 | 474 found_machif = true; |
| 475 break; | |
| 476 } | |
| 477 | |
| 12323 | 478 // For nodes that produce a FlagsProj, make the node adjacent to the |
| 479 // use of the FlagsProj | |
| 480 if (use->is_FlagsProj() && get_block_for_node(use) == block) { | |
| 481 found_machif = true; | |
| 482 break; | |
| 483 } | |
| 484 | |
| 0 | 485 // More than this instruction pending for successor to be ready, |
| 486 // don't choose this if other opportunities are ready | |
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487 if (ready_cnt.at(use->_idx) > 1) |
| 0 | 488 n_choice = 1; |
| 489 } | |
| 490 | |
| 491 // loop terminated, prefer not to use this instruction | |
| 492 if (found_machif) | |
| 493 continue; | |
| 494 } | |
| 495 | |
| 496 // See if this has a predecessor that is "must_clone", i.e. sets the | |
| 497 // condition code. If so, choose this first | |
| 498 for (uint j = 0; j < n->req() ; j++) { | |
| 499 Node *inn = n->in(j); | |
| 500 if (inn) { | |
| 501 if (inn->is_Mach() && must_clone[inn->as_Mach()->ideal_Opcode()] ) { | |
| 502 n_choice = 3; | |
| 503 break; | |
| 504 } | |
| 505 } | |
| 506 } | |
| 507 | |
| 508 // MachTemps should be scheduled last so they are near their uses | |
| 509 if (n->is_MachTemp()) { | |
| 510 n_choice = 1; | |
| 511 } | |
| 512 | |
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513 uint n_latency = get_latency_for_node(n); |
| 0 | 514 uint n_score = n->req(); // Many inputs get high score to break ties |
| 515 | |
| 516 // Keep best latency found | |
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517 cand_cnt++; |
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518 if (choice < n_choice || |
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519 (choice == n_choice && |
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520 ((StressLCM && Compile::randomized_select(cand_cnt)) || |
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521 (!StressLCM && |
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522 (latency < n_latency || |
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523 (latency == n_latency && |
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524 (score < n_score))))))) { |
| 0 | 525 choice = n_choice; |
| 526 latency = n_latency; | |
| 527 score = n_score; | |
| 528 idx = i; // Also keep index in worklist | |
| 529 } | |
| 530 } // End of for all ready nodes in worklist | |
| 531 | |
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532 assert(idx >= 0, "index should be set"); |
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533 Node *n = worklist[(uint)idx]; // Get the winner |
| 0 | 534 |
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535 worklist.map((uint)idx, worklist.pop()); // Compress worklist |
| 0 | 536 return n; |
| 537 } | |
| 538 | |
| 539 | |
| 540 //------------------------------set_next_call---------------------------------- | |
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541 void PhaseCFG::set_next_call(Block* block, Node* n, VectorSet& next_call) { |
| 0 | 542 if( next_call.test_set(n->_idx) ) return; |
| 543 for( uint i=0; i<n->len(); i++ ) { | |
| 544 Node *m = n->in(i); | |
| 545 if( !m ) continue; // must see all nodes in block that precede call | |
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546 if (get_block_for_node(m) == block) { |
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547 set_next_call(block, m, next_call); |
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548 } |
| 0 | 549 } |
| 550 } | |
| 551 | |
| 552 //------------------------------needed_for_next_call--------------------------- | |
| 553 // Set the flag 'next_call' for each Node that is needed for the next call to | |
| 554 // be scheduled. This flag lets me bias scheduling so Nodes needed for the | |
| 555 // next subroutine call get priority - basically it moves things NOT needed | |
| 556 // for the next call till after the call. This prevents me from trying to | |
| 557 // carry lots of stuff live across a call. | |
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558 void PhaseCFG::needed_for_next_call(Block* block, Node* this_call, VectorSet& next_call) { |
| 0 | 559 // Find the next control-defining Node in this block |
| 560 Node* call = NULL; | |
| 561 for (DUIterator_Fast imax, i = this_call->fast_outs(imax); i < imax; i++) { | |
| 562 Node* m = this_call->fast_out(i); | |
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563 if (get_block_for_node(m) == block && // Local-block user |
| 0 | 564 m != this_call && // Not self-start node |
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565 m->is_MachCall()) { |
| 0 | 566 call = m; |
| 567 break; | |
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568 } |
| 0 | 569 } |
| 570 if (call == NULL) return; // No next call (e.g., block end is near) | |
| 571 // Set next-call for all inputs to this call | |
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572 set_next_call(block, call, next_call); |
| 0 | 573 } |
| 574 | |
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575 //------------------------------add_call_kills------------------------------------- |
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576 // helper function that adds caller save registers to MachProjNode |
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577 static void add_call_kills(MachProjNode *proj, RegMask& regs, const char* save_policy, bool exclude_soe) { |
|
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578 // Fill in the kill mask for the call |
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579 for( OptoReg::Name r = OptoReg::Name(0); r < _last_Mach_Reg; r=OptoReg::add(r,1) ) { |
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580 if( !regs.Member(r) ) { // Not already defined by the call |
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581 // Save-on-call register? |
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582 if ((save_policy[r] == 'C') || |
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583 (save_policy[r] == 'A') || |
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584 ((save_policy[r] == 'E') && exclude_soe)) { |
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585 proj->_rout.Insert(r); |
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586 } |
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587 } |
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588 } |
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589 } |
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590 |
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591 |
| 0 | 592 //------------------------------sched_call------------------------------------- |
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593 uint PhaseCFG::sched_call(Block* block, uint node_cnt, Node_List& worklist, GrowableArray<int>& ready_cnt, MachCallNode* mcall, VectorSet& next_call) { |
| 0 | 594 RegMask regs; |
| 595 | |
| 596 // Schedule all the users of the call right now. All the users are | |
| 597 // projection Nodes, so they must be scheduled next to the call. | |
| 598 // Collect all the defined registers. | |
| 599 for (DUIterator_Fast imax, i = mcall->fast_outs(imax); i < imax; i++) { | |
| 600 Node* n = mcall->fast_out(i); | |
| 3842 | 601 assert( n->is_MachProj(), "" ); |
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602 int n_cnt = ready_cnt.at(n->_idx)-1; |
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603 ready_cnt.at_put(n->_idx, n_cnt); |
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604 assert( n_cnt == 0, "" ); |
| 0 | 605 // Schedule next to call |
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606 block->map_node(n, node_cnt++); |
| 0 | 607 // Collect defined registers |
| 608 regs.OR(n->out_RegMask()); | |
| 609 // Check for scheduling the next control-definer | |
| 610 if( n->bottom_type() == Type::CONTROL ) | |
| 611 // Warm up next pile of heuristic bits | |
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612 needed_for_next_call(block, n, next_call); |
| 0 | 613 |
| 614 // Children of projections are now all ready | |
| 615 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { | |
| 616 Node* m = n->fast_out(j); // Get user | |
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617 if(get_block_for_node(m) != block) { |
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618 continue; |
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619 } |
| 0 | 620 if( m->is_Phi() ) continue; |
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621 int m_cnt = ready_cnt.at(m->_idx)-1; |
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622 ready_cnt.at_put(m->_idx, m_cnt); |
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623 if( m_cnt == 0 ) |
| 0 | 624 worklist.push(m); |
| 625 } | |
| 626 | |
| 627 } | |
| 628 | |
| 629 // Act as if the call defines the Frame Pointer. | |
| 630 // Certainly the FP is alive and well after the call. | |
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631 regs.Insert(_matcher.c_frame_pointer()); |
| 0 | 632 |
| 633 // Set all registers killed and not already defined by the call. | |
| 634 uint r_cnt = mcall->tf()->range()->cnt(); | |
| 635 int op = mcall->ideal_Opcode(); | |
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636 MachProjNode *proj = new (C) MachProjNode( mcall, r_cnt+1, RegMask::Empty, MachProjNode::fat_proj ); |
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637 map_node_to_block(proj, block); |
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638 block->insert_node(proj, node_cnt++); |
| 0 | 639 |
| 640 // Select the right register save policy. | |
| 641 const char * save_policy; | |
| 642 switch (op) { | |
| 643 case Op_CallRuntime: | |
| 644 case Op_CallLeaf: | |
| 645 case Op_CallLeafNoFP: | |
| 646 // Calling C code so use C calling convention | |
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647 save_policy = _matcher._c_reg_save_policy; |
| 0 | 648 break; |
| 649 | |
| 650 case Op_CallStaticJava: | |
| 651 case Op_CallDynamicJava: | |
| 652 // Calling Java code so use Java calling convention | |
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653 save_policy = _matcher._register_save_policy; |
| 0 | 654 break; |
| 655 | |
| 656 default: | |
| 657 ShouldNotReachHere(); | |
| 658 } | |
| 659 | |
| 660 // When using CallRuntime mark SOE registers as killed by the call | |
| 661 // so values that could show up in the RegisterMap aren't live in a | |
| 662 // callee saved register since the register wouldn't know where to | |
| 663 // find them. CallLeaf and CallLeafNoFP are ok because they can't | |
| 664 // have debug info on them. Strictly speaking this only needs to be | |
| 665 // done for oops since idealreg2debugmask takes care of debug info | |
| 666 // references but there no way to handle oops differently than other | |
| 667 // pointers as far as the kill mask goes. | |
| 668 bool exclude_soe = op == Op_CallRuntime; | |
| 669 | |
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670 // If the call is a MethodHandle invoke, we need to exclude the |
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671 // register which is used to save the SP value over MH invokes from |
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672 // the mask. Otherwise this register could be used for |
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673 // deoptimization information. |
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674 if (op == Op_CallStaticJava) { |
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675 MachCallStaticJavaNode* mcallstaticjava = (MachCallStaticJavaNode*) mcall; |
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676 if (mcallstaticjava->_method_handle_invoke) |
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677 proj->_rout.OR(Matcher::method_handle_invoke_SP_save_mask()); |
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678 } |
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679 |
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680 add_call_kills(proj, regs, save_policy, exclude_soe); |
| 0 | 681 |
| 682 return node_cnt; | |
| 683 } | |
| 684 | |
| 685 | |
| 686 //------------------------------schedule_local--------------------------------- | |
| 687 // Topological sort within a block. Someday become a real scheduler. | |
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688 bool PhaseCFG::schedule_local(Block* block, GrowableArray<int>& ready_cnt, VectorSet& next_call) { |
| 0 | 689 // Already "sorted" are the block start Node (as the first entry), and |
| 690 // the block-ending Node and any trailing control projections. We leave | |
| 691 // these alone. PhiNodes and ParmNodes are made to follow the block start | |
| 692 // Node. Everything else gets topo-sorted. | |
| 693 | |
| 694 #ifndef PRODUCT | |
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695 if (trace_opto_pipelining()) { |
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696 tty->print_cr("# --- schedule_local B%d, before: ---", block->_pre_order); |
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697 for (uint i = 0;i < block->number_of_nodes(); i++) { |
| 0 | 698 tty->print("# "); |
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699 block->get_node(i)->fast_dump(); |
| 0 | 700 } |
| 701 tty->print_cr("#"); | |
| 702 } | |
| 703 #endif | |
| 704 | |
| 705 // RootNode is already sorted | |
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706 if (block->number_of_nodes() == 1) { |
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707 return true; |
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708 } |
| 0 | 709 |
| 710 // Move PhiNodes and ParmNodes from 1 to cnt up to the start | |
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711 uint node_cnt = block->end_idx(); |
| 0 | 712 uint phi_cnt = 1; |
| 713 uint i; | |
| 714 for( i = 1; i<node_cnt; i++ ) { // Scan for Phi | |
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715 Node *n = block->get_node(i); |
| 0 | 716 if( n->is_Phi() || // Found a PhiNode or ParmNode |
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717 (n->is_Proj() && n->in(0) == block->head()) ) { |
| 0 | 718 // Move guy at 'phi_cnt' to the end; makes a hole at phi_cnt |
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719 block->map_node(block->get_node(phi_cnt), i); |
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720 block->map_node(n, phi_cnt++); // swap Phi/Parm up front |
| 0 | 721 } else { // All others |
| 722 // Count block-local inputs to 'n' | |
| 723 uint cnt = n->len(); // Input count | |
| 724 uint local = 0; | |
| 725 for( uint j=0; j<cnt; j++ ) { | |
| 726 Node *m = n->in(j); | |
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727 if( m && get_block_for_node(m) == block && !m->is_top() ) |
| 0 | 728 local++; // One more block-local input |
| 729 } | |
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730 ready_cnt.at_put(n->_idx, local); // Count em up |
| 0 | 731 |
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732 #ifdef ASSERT |
|
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|
733 if( UseConcMarkSweepGC || UseG1GC ) { |
| 0 | 734 if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_StoreCM ) { |
|
3248
e6beb62de02d
7032963: StoreCM shouldn't participate in store elimination
never
parents:
1972
diff
changeset
|
735 // Check the precedence edges |
|
e6beb62de02d
7032963: StoreCM shouldn't participate in store elimination
never
parents:
1972
diff
changeset
|
736 for (uint prec = n->req(); prec < n->len(); prec++) { |
|
e6beb62de02d
7032963: StoreCM shouldn't participate in store elimination
never
parents:
1972
diff
changeset
|
737 Node* oop_store = n->in(prec); |
|
e6beb62de02d
7032963: StoreCM shouldn't participate in store elimination
never
parents:
1972
diff
changeset
|
738 if (oop_store != NULL) { |
|
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|
739 assert(get_block_for_node(oop_store)->_dom_depth <= block->_dom_depth, "oop_store must dominate card-mark"); |
|
3248
e6beb62de02d
7032963: StoreCM shouldn't participate in store elimination
never
parents:
1972
diff
changeset
|
740 } |
|
e6beb62de02d
7032963: StoreCM shouldn't participate in store elimination
never
parents:
1972
diff
changeset
|
741 } |
| 0 | 742 } |
| 743 } | |
|
3248
e6beb62de02d
7032963: StoreCM shouldn't participate in store elimination
never
parents:
1972
diff
changeset
|
744 #endif |
|
e6beb62de02d
7032963: StoreCM shouldn't participate in store elimination
never
parents:
1972
diff
changeset
|
745 |
|
e6beb62de02d
7032963: StoreCM shouldn't participate in store elimination
never
parents:
1972
diff
changeset
|
746 // A few node types require changing a required edge to a precedence edge |
|
e6beb62de02d
7032963: StoreCM shouldn't participate in store elimination
never
parents:
1972
diff
changeset
|
747 // before allocation. |
|
1100
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
681
diff
changeset
|
748 if( n->is_Mach() && n->req() > TypeFunc::Parms && |
|
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
681
diff
changeset
|
749 (n->as_Mach()->ideal_Opcode() == Op_MemBarAcquire || |
|
f96a1a986f7b
6895383: JCK test throws NPE for method compiled with Escape Analysis
kvn
parents:
681
diff
changeset
|
750 n->as_Mach()->ideal_Opcode() == Op_MemBarVolatile) ) { |
|
253
b0fe4deeb9fb
6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents:
196
diff
changeset
|
751 // MemBarAcquire could be created without Precedent edge. |
|
b0fe4deeb9fb
6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents:
196
diff
changeset
|
752 // del_req() replaces the specified edge with the last input edge |
|
b0fe4deeb9fb
6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents:
196
diff
changeset
|
753 // and then removes the last edge. If the specified edge > number of |
|
b0fe4deeb9fb
6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents:
196
diff
changeset
|
754 // edges the last edge will be moved outside of the input edges array |
|
b0fe4deeb9fb
6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents:
196
diff
changeset
|
755 // and the edge will be lost. This is why this code should be |
|
b0fe4deeb9fb
6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents:
196
diff
changeset
|
756 // executed only when Precedent (== TypeFunc::Parms) edge is present. |
| 0 | 757 Node *x = n->in(TypeFunc::Parms); |
| 758 n->del_req(TypeFunc::Parms); | |
| 759 n->add_prec(x); | |
| 760 } | |
| 761 } | |
| 762 } | |
|
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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12167
diff
changeset
|
763 for(uint i2=i; i2< block->number_of_nodes(); i2++ ) // Trailing guys get zapped count |
|
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
764 ready_cnt.at_put(block->get_node(i2)->_idx, 0); |
| 0 | 765 |
| 766 // All the prescheduled guys do not hold back internal nodes | |
| 767 uint i3; | |
| 768 for(i3 = 0; i3<phi_cnt; i3++ ) { // For all pre-scheduled | |
|
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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diff
changeset
|
769 Node *n = block->get_node(i3); // Get pre-scheduled |
| 0 | 770 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { |
| 771 Node* m = n->fast_out(j); | |
|
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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12167
diff
changeset
|
772 if (get_block_for_node(m) == block) { // Local-block user |
|
4820
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7116050: C2/ARM: memory stomping error with DivideMcTests
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diff
changeset
|
773 int m_cnt = ready_cnt.at(m->_idx)-1; |
|
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7116050: C2/ARM: memory stomping error with DivideMcTests
roland
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4120
diff
changeset
|
774 ready_cnt.at_put(m->_idx, m_cnt); // Fix ready count |
|
cf407b7d3d78
7116050: C2/ARM: memory stomping error with DivideMcTests
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diff
changeset
|
775 } |
| 0 | 776 } |
| 777 } | |
| 778 | |
| 779 Node_List delay; | |
| 780 // Make a worklist | |
| 781 Node_List worklist; | |
| 782 for(uint i4=i3; i4<node_cnt; i4++ ) { // Put ready guys on worklist | |
|
12171
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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diff
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|
783 Node *m = block->get_node(i4); |
|
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diff
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|
784 if( !ready_cnt.at(m->_idx) ) { // Zero ready count? |
| 0 | 785 if (m->is_iteratively_computed()) { |
| 786 // Push induction variable increments last to allow other uses | |
| 787 // of the phi to be scheduled first. The select() method breaks | |
| 788 // ties in scheduling by worklist order. | |
| 789 delay.push(m); | |
|
125
d942c7e64bd9
6601321: Assert(j == 1 || b->_nodes[j-1]->is_Phi(),"CreateEx must be first instruction in block")
never
parents:
113
diff
changeset
|
790 } else if (m->is_Mach() && m->as_Mach()->ideal_Opcode() == Op_CreateEx) { |
|
d942c7e64bd9
6601321: Assert(j == 1 || b->_nodes[j-1]->is_Phi(),"CreateEx must be first instruction in block")
never
parents:
113
diff
changeset
|
791 // Force the CreateEx to the top of the list so it's processed |
|
d942c7e64bd9
6601321: Assert(j == 1 || b->_nodes[j-1]->is_Phi(),"CreateEx must be first instruction in block")
never
parents:
113
diff
changeset
|
792 // first and ends up at the start of the block. |
|
d942c7e64bd9
6601321: Assert(j == 1 || b->_nodes[j-1]->is_Phi(),"CreateEx must be first instruction in block")
never
parents:
113
diff
changeset
|
793 worklist.insert(0, m); |
| 0 | 794 } else { |
| 795 worklist.push(m); // Then on to worklist! | |
| 796 } | |
| 797 } | |
| 798 } | |
| 799 while (delay.size()) { | |
| 800 Node* d = delay.pop(); | |
| 801 worklist.push(d); | |
| 802 } | |
| 803 | |
| 804 // Warm up the 'next_call' heuristic bits | |
|
12171
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
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diff
changeset
|
805 needed_for_next_call(block, block->head(), next_call); |
| 0 | 806 |
| 807 #ifndef PRODUCT | |
|
12171
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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12167
diff
changeset
|
808 if (trace_opto_pipelining()) { |
|
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
809 for (uint j=0; j< block->number_of_nodes(); j++) { |
|
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
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diff
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|
810 Node *n = block->get_node(j); |
| 0 | 811 int idx = n->_idx; |
|
4820
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changeset
|
812 tty->print("# ready cnt:%3d ", ready_cnt.at(idx)); |
|
12171
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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12167
diff
changeset
|
813 tty->print("latency:%3d ", get_latency_for_node(n)); |
| 0 | 814 tty->print("%4d: %s\n", idx, n->Name()); |
| 815 } | |
| 816 } | |
| 817 #endif | |
| 818 | |
|
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parents:
4120
diff
changeset
|
819 uint max_idx = (uint)ready_cnt.length(); |
| 0 | 820 // Pull from worklist and schedule |
| 821 while( worklist.size() ) { // Worklist is not ready | |
| 822 | |
| 823 #ifndef PRODUCT | |
|
12171
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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12167
diff
changeset
|
824 if (trace_opto_pipelining()) { |
| 0 | 825 tty->print("# ready list:"); |
| 826 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
| 827 Node *n = worklist[i]; // Get Node on worklist | |
| 828 tty->print(" %d", n->_idx); | |
| 829 } | |
| 830 tty->cr(); | |
| 831 } | |
| 832 #endif | |
| 833 | |
| 834 // Select and pop a ready guy from worklist | |
|
12171
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
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12167
diff
changeset
|
835 Node* n = select(block, worklist, ready_cnt, next_call, phi_cnt); |
|
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
836 block->map_node(n, phi_cnt++); // Schedule him next |
| 0 | 837 |
| 838 #ifndef PRODUCT | |
|
12171
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
839 if (trace_opto_pipelining()) { |
| 0 | 840 tty->print("# select %d: %s", n->_idx, n->Name()); |
|
12171
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
841 tty->print(", latency:%d", get_latency_for_node(n)); |
| 0 | 842 n->dump(); |
| 843 if (Verbose) { | |
| 844 tty->print("# ready list:"); | |
| 845 for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist | |
| 846 Node *n = worklist[i]; // Get Node on worklist | |
| 847 tty->print(" %d", n->_idx); | |
| 848 } | |
| 849 tty->cr(); | |
| 850 } | |
| 851 } | |
| 852 | |
| 853 #endif | |
| 854 if( n->is_MachCall() ) { | |
| 855 MachCallNode *mcall = n->as_MachCall(); | |
|
12171
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
856 phi_cnt = sched_call(block, phi_cnt, worklist, ready_cnt, mcall, next_call); |
| 0 | 857 continue; |
| 858 } | |
|
4120
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
parents:
3842
diff
changeset
|
859 |
|
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
parents:
3842
diff
changeset
|
860 if (n->is_Mach() && n->as_Mach()->has_call()) { |
|
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
parents:
3842
diff
changeset
|
861 RegMask regs; |
|
12171
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
862 regs.Insert(_matcher.c_frame_pointer()); |
|
4120
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
parents:
3842
diff
changeset
|
863 regs.OR(n->out_RegMask()); |
|
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
parents:
3842
diff
changeset
|
864 |
|
12171
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
865 MachProjNode *proj = new (C) MachProjNode( n, 1, RegMask::Empty, MachProjNode::fat_proj ); |
|
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
866 map_node_to_block(proj, block); |
|
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
867 block->insert_node(proj, phi_cnt++); |
|
4120
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
parents:
3842
diff
changeset
|
868 |
|
12171
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
869 add_call_kills(proj, regs, _matcher._c_reg_save_policy, false); |
|
4120
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
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3842
diff
changeset
|
870 } |
|
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
parents:
3842
diff
changeset
|
871 |
| 0 | 872 // Children are now all ready |
| 873 for (DUIterator_Fast i5max, i5 = n->fast_outs(i5max); i5 < i5max; i5++) { | |
| 874 Node* m = n->fast_out(i5); // Get user | |
|
12171
4b078f877b56
8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
adlertz
parents:
12167
diff
changeset
|
875 if (get_block_for_node(m) != block) { |
|
12023
d1034bd8cefc
8022284: Hide internal data structure in PhaseCFG
adlertz
parents:
10279
diff
changeset
|
876 continue; |
|
d1034bd8cefc
8022284: Hide internal data structure in PhaseCFG
adlertz
parents:
10279
diff
changeset
|
877 } |
| 0 | 878 if( m->is_Phi() ) continue; |
|
4820
cf407b7d3d78
7116050: C2/ARM: memory stomping error with DivideMcTests
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parents:
4120
diff
changeset
|
879 if (m->_idx >= max_idx) { // new node, skip it |
|
4120
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
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diff
changeset
|
880 assert(m->is_MachProj() && n->is_Mach() && n->as_Mach()->has_call(), "unexpected node types"); |
|
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
parents:
3842
diff
changeset
|
881 continue; |
|
f03a3c8bd5e5
7077312: Provide a CALL effect for instruct declaration in the ad file
roland
parents:
3842
diff
changeset
|
882 } |
|
4820
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|
883 int m_cnt = ready_cnt.at(m->_idx)-1; |
|
cf407b7d3d78
7116050: C2/ARM: memory stomping error with DivideMcTests
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4120
diff
changeset
|
884 ready_cnt.at_put(m->_idx, m_cnt); |
|
cf407b7d3d78
7116050: C2/ARM: memory stomping error with DivideMcTests
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4120
diff
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|
885 if( m_cnt == 0 ) |
| 0 | 886 worklist.push(m); |
| 887 } | |
| 888 } | |
| 889 | |
|
12171
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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12167
diff
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|
890 if( phi_cnt != block->end_idx() ) { |
| 0 | 891 // did not schedule all. Retry, Bailout, or Die |
| 892 if (C->subsume_loads() == true && !C->failing()) { | |
| 893 // Retry with subsume_loads == false | |
| 894 // If this is the first failure, the sentinel string will "stick" | |
| 895 // to the Compile object, and the C2Compiler will see it and retry. | |
| 896 C->record_failure(C2Compiler::retry_no_subsuming_loads()); | |
| 897 } | |
| 898 // assert( phi_cnt == end_idx(), "did not schedule all" ); | |
| 899 return false; | |
| 900 } | |
| 901 | |
| 902 #ifndef PRODUCT | |
|
12171
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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|
903 if (trace_opto_pipelining()) { |
| 0 | 904 tty->print_cr("#"); |
| 905 tty->print_cr("# after schedule_local"); | |
|
12171
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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diff
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|
906 for (uint i = 0;i < block->number_of_nodes();i++) { |
| 0 | 907 tty->print("# "); |
|
12171
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8023988: Move local scheduling of nodes to the CFG creation and code motion phase (PhaseCFG)
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|
908 block->get_node(i)->fast_dump(); |
| 0 | 909 } |
| 910 tty->cr(); | |
| 911 } | |
| 912 #endif | |
| 913 | |
| 914 | |
| 915 return true; | |
| 916 } | |
| 917 | |
| 918 //--------------------------catch_cleanup_fix_all_inputs----------------------- | |
| 919 static void catch_cleanup_fix_all_inputs(Node *use, Node *old_def, Node *new_def) { | |
| 920 for (uint l = 0; l < use->len(); l++) { | |
| 921 if (use->in(l) == old_def) { | |
| 922 if (l < use->req()) { | |
| 923 use->set_req(l, new_def); | |
| 924 } else { | |
| 925 use->rm_prec(l); | |
| 926 use->add_prec(new_def); | |
| 927 l--; | |
| 928 } | |
| 929 } | |
| 930 } | |
| 931 } | |
| 932 | |
| 933 //------------------------------catch_cleanup_find_cloned_def------------------ | |
|
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|
934 Node* PhaseCFG::catch_cleanup_find_cloned_def(Block *use_blk, Node *def, Block *def_blk, int n_clone_idx) { |
| 0 | 935 assert( use_blk != def_blk, "Inter-block cleanup only"); |
| 936 | |
| 937 // The use is some block below the Catch. Find and return the clone of the def | |
| 938 // that dominates the use. If there is no clone in a dominating block, then | |
| 939 // create a phi for the def in a dominating block. | |
| 940 | |
| 941 // Find which successor block dominates this use. The successor | |
| 942 // blocks must all be single-entry (from the Catch only; I will have | |
| 943 // split blocks to make this so), hence they all dominate. | |
| 944 while( use_blk->_dom_depth > def_blk->_dom_depth+1 ) | |
| 945 use_blk = use_blk->_idom; | |
| 946 | |
| 947 // Find the successor | |
| 948 Node *fixup = NULL; | |
| 949 | |
| 950 uint j; | |
| 951 for( j = 0; j < def_blk->_num_succs; j++ ) | |
| 952 if( use_blk == def_blk->_succs[j] ) | |
| 953 break; | |
| 954 | |
| 955 if( j == def_blk->_num_succs ) { | |
| 956 // Block at same level in dom-tree is not a successor. It needs a | |
| 957 // PhiNode, the PhiNode uses from the def and IT's uses need fixup. | |
| 958 Node_Array inputs = new Node_List(Thread::current()->resource_area()); | |
| 959 for(uint k = 1; k < use_blk->num_preds(); k++) { | |
|
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960 Block* block = get_block_for_node(use_blk->pred(k)); |
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961 inputs.map(k, catch_cleanup_find_cloned_def(block, def, def_blk, n_clone_idx)); |
| 0 | 962 } |
| 963 | |
| 964 // Check to see if the use_blk already has an identical phi inserted. | |
| 965 // If it exists, it will be at the first position since all uses of a | |
| 966 // def are processed together. | |
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967 Node *phi = use_blk->get_node(1); |
| 0 | 968 if( phi->is_Phi() ) { |
| 969 fixup = phi; | |
| 970 for (uint k = 1; k < use_blk->num_preds(); k++) { | |
| 971 if (phi->in(k) != inputs[k]) { | |
| 972 // Not a match | |
| 973 fixup = NULL; | |
| 974 break; | |
| 975 } | |
| 976 } | |
| 977 } | |
| 978 | |
| 979 // If an existing PhiNode was not found, make a new one. | |
| 980 if (fixup == NULL) { | |
| 981 Node *new_phi = PhiNode::make(use_blk->head(), def); | |
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982 use_blk->insert_node(new_phi, 1); |
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983 map_node_to_block(new_phi, use_blk); |
| 0 | 984 for (uint k = 1; k < use_blk->num_preds(); k++) { |
| 985 new_phi->set_req(k, inputs[k]); | |
| 986 } | |
| 987 fixup = new_phi; | |
| 988 } | |
| 989 | |
| 990 } else { | |
| 991 // Found the use just below the Catch. Make it use the clone. | |
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992 fixup = use_blk->get_node(n_clone_idx); |
| 0 | 993 } |
| 994 | |
| 995 return fixup; | |
| 996 } | |
| 997 | |
| 998 //--------------------------catch_cleanup_intra_block-------------------------- | |
| 999 // Fix all input edges in use that reference "def". The use is in the same | |
| 1000 // block as the def and both have been cloned in each successor block. | |
| 1001 static void catch_cleanup_intra_block(Node *use, Node *def, Block *blk, int beg, int n_clone_idx) { | |
| 1002 | |
| 1003 // Both the use and def have been cloned. For each successor block, | |
| 1004 // get the clone of the use, and make its input the clone of the def | |
| 1005 // found in that block. | |
| 1006 | |
| 1007 uint use_idx = blk->find_node(use); | |
| 1008 uint offset_idx = use_idx - beg; | |
| 1009 for( uint k = 0; k < blk->_num_succs; k++ ) { | |
| 1010 // Get clone in each successor block | |
| 1011 Block *sb = blk->_succs[k]; | |
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1012 Node *clone = sb->get_node(offset_idx+1); |
| 0 | 1013 assert( clone->Opcode() == use->Opcode(), "" ); |
| 1014 | |
| 1015 // Make use-clone reference the def-clone | |
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1016 catch_cleanup_fix_all_inputs(clone, def, sb->get_node(n_clone_idx)); |
| 0 | 1017 } |
| 1018 } | |
| 1019 | |
| 1020 //------------------------------catch_cleanup_inter_block--------------------- | |
| 1021 // Fix all input edges in use that reference "def". The use is in a different | |
| 1022 // block than the def. | |
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1023 void PhaseCFG::catch_cleanup_inter_block(Node *use, Block *use_blk, Node *def, Block *def_blk, int n_clone_idx) { |
| 0 | 1024 if( !use_blk ) return; // Can happen if the use is a precedence edge |
| 1025 | |
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1026 Node *new_def = catch_cleanup_find_cloned_def(use_blk, def, def_blk, n_clone_idx); |
| 0 | 1027 catch_cleanup_fix_all_inputs(use, def, new_def); |
| 1028 } | |
| 1029 | |
| 1030 //------------------------------call_catch_cleanup----------------------------- | |
| 1031 // If we inserted any instructions between a Call and his CatchNode, | |
| 1032 // clone the instructions on all paths below the Catch. | |
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1033 void PhaseCFG::call_catch_cleanup(Block* block) { |
| 0 | 1034 |
| 1035 // End of region to clone | |
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1036 uint end = block->end_idx(); |
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1037 if( !block->get_node(end)->is_Catch() ) return; |
| 0 | 1038 // Start of region to clone |
| 1039 uint beg = end; | |
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1040 while(!block->get_node(beg-1)->is_MachProj() || |
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1041 !block->get_node(beg-1)->in(0)->is_MachCall() ) { |
| 0 | 1042 beg--; |
| 1043 assert(beg > 0,"Catch cleanup walking beyond block boundary"); | |
| 1044 } | |
| 1045 // Range of inserted instructions is [beg, end) | |
| 1046 if( beg == end ) return; | |
| 1047 | |
| 1048 // Clone along all Catch output paths. Clone area between the 'beg' and | |
| 1049 // 'end' indices. | |
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1050 for( uint i = 0; i < block->_num_succs; i++ ) { |
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1051 Block *sb = block->_succs[i]; |
| 0 | 1052 // Clone the entire area; ignoring the edge fixup for now. |
| 1053 for( uint j = end; j > beg; j-- ) { | |
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1054 // It is safe here to clone a node with anti_dependence |
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1055 // since clones dominate on each path. |
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1056 Node *clone = block->get_node(j-1)->clone(); |
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1057 sb->insert_node(clone, 1); |
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1058 map_node_to_block(clone, sb); |
| 0 | 1059 } |
| 1060 } | |
| 1061 | |
| 1062 | |
| 1063 // Fixup edges. Check the def-use info per cloned Node | |
| 1064 for(uint i2 = beg; i2 < end; i2++ ) { | |
| 1065 uint n_clone_idx = i2-beg+1; // Index of clone of n in each successor block | |
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1066 Node *n = block->get_node(i2); // Node that got cloned |
| 0 | 1067 // Need DU safe iterator because of edge manipulation in calls. |
| 1068 Unique_Node_List *out = new Unique_Node_List(Thread::current()->resource_area()); | |
| 1069 for (DUIterator_Fast j1max, j1 = n->fast_outs(j1max); j1 < j1max; j1++) { | |
| 1070 out->push(n->fast_out(j1)); | |
| 1071 } | |
| 1072 uint max = out->size(); | |
| 1073 for (uint j = 0; j < max; j++) {// For all users | |
| 1074 Node *use = out->pop(); | |
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1075 Block *buse = get_block_for_node(use); |
| 0 | 1076 if( use->is_Phi() ) { |
| 1077 for( uint k = 1; k < use->req(); k++ ) | |
| 1078 if( use->in(k) == n ) { | |
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1079 Block* b = get_block_for_node(buse->pred(k)); |
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1080 Node *fixup = catch_cleanup_find_cloned_def(b, n, block, n_clone_idx); |
| 0 | 1081 use->set_req(k, fixup); |
| 1082 } | |
| 1083 } else { | |
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1084 if (block == buse) { |
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1085 catch_cleanup_intra_block(use, n, block, beg, n_clone_idx); |
| 0 | 1086 } else { |
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1087 catch_cleanup_inter_block(use, buse, n, block, n_clone_idx); |
| 0 | 1088 } |
| 1089 } | |
| 1090 } // End for all users | |
| 1091 | |
| 1092 } // End of for all Nodes in cloned area | |
| 1093 | |
| 1094 // Remove the now-dead cloned ops | |
| 1095 for(uint i3 = beg; i3 < end; i3++ ) { | |
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1096 block->get_node(beg)->disconnect_inputs(NULL, C); |
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1097 block->remove_node(beg); |
| 0 | 1098 } |
| 1099 | |
| 1100 // If the successor blocks have a CreateEx node, move it back to the top | |
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1101 for(uint i4 = 0; i4 < block->_num_succs; i4++ ) { |
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1102 Block *sb = block->_succs[i4]; |
| 0 | 1103 uint new_cnt = end - beg; |
| 1104 // Remove any newly created, but dead, nodes. | |
| 1105 for( uint j = new_cnt; j > 0; j-- ) { | |
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1106 Node *n = sb->get_node(j); |
| 0 | 1107 if (n->outcnt() == 0 && |
| 1108 (!n->is_Proj() || n->as_Proj()->in(0)->outcnt() == 1) ){ | |
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1109 n->disconnect_inputs(NULL, C); |
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1110 sb->remove_node(j); |
| 0 | 1111 new_cnt--; |
| 1112 } | |
| 1113 } | |
| 1114 // If any newly created nodes remain, move the CreateEx node to the top | |
| 1115 if (new_cnt > 0) { | |
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1116 Node *cex = sb->get_node(1+new_cnt); |
| 0 | 1117 if( cex->is_Mach() && cex->as_Mach()->ideal_Opcode() == Op_CreateEx ) { |
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1118 sb->remove_node(1+new_cnt); |
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1119 sb->insert_node(cex, 1); |
| 0 | 1120 } |
| 1121 } | |
| 1122 } | |
| 1123 } |