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comparison src/share/vm/opto/parse3.cpp @ 14452:c6d7e7406136

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8029101: PPC64 (part 211): ordering of Independent Reads of Independent Writes Reviewed-by: dholmes, kvn Contributed-by: martin.doerr@sap.com
author goetz
date Thu, 16 Jan 2014 14:25:51 +0100
parents 2113136690bc
children 45467c53f178
comparison
equal deleted inserted replaced
14451:b858620b0081 14452:c6d7e7406136
225 type = TypeOopPtr::make_from_klass(field_klass->as_klass()); 225 type = TypeOopPtr::make_from_klass(field_klass->as_klass());
226 } 226 }
227 } else { 227 } else {
228 type = Type::get_const_basic_type(bt); 228 type = Type::get_const_basic_type(bt);
229 } 229 }
230 if (support_IRIW_for_not_multiple_copy_atomic_cpu && field->is_volatile()) {
231 insert_mem_bar(Op_MemBarVolatile); // StoreLoad barrier
232 }
230 // Build the load. 233 // Build the load.
231 // 234 //
232 MemNode::MemOrd mo = is_vol ? MemNode::acquire : MemNode::unordered; 235 MemNode::MemOrd mo = is_vol ? MemNode::acquire : MemNode::unordered;
233 Node* ld = make_load(NULL, adr, type, bt, adr_type, mo, is_vol); 236 Node* ld = make_load(NULL, adr, type, bt, adr_type, mo, is_vol);
234 237
315 } 318 }
316 319
317 // If reference is volatile, prevent following volatiles ops from 320 // If reference is volatile, prevent following volatiles ops from
318 // floating up before the volatile write. 321 // floating up before the volatile write.
319 if (is_vol) { 322 if (is_vol) {
320 insert_mem_bar(Op_MemBarVolatile); // Use fat membar 323 // If not multiple copy atomic, we do the MemBarVolatile before the load.
324 if (!support_IRIW_for_not_multiple_copy_atomic_cpu) {
325 insert_mem_bar(Op_MemBarVolatile); // Use fat membar
326 }
327 // Remember we wrote a volatile field.
328 // For not multiple copy atomic cpu (ppc64) a barrier should be issued
329 // in constructors which have such stores. See do_exits() in parse1.cpp.
330 if (is_field) {
331 set_wrote_volatile(true);
332 }
321 } 333 }
322 334
323 // If the field is final, the rules of Java say we are in <init> or <clinit>. 335 // If the field is final, the rules of Java say we are in <init> or <clinit>.
324 // Note the presence of writes to final non-static fields, so that we 336 // Note the presence of writes to final non-static fields, so that we
325 // can insert a memory barrier later on to keep the writes from floating 337 // can insert a memory barrier later on to keep the writes from floating