Mercurial > hg > truffle
comparison src/share/vm/opto/runtime.cpp @ 3961:a92cdbac8b9e
7081933: Use zeroing elimination optimization for large array
Summary: Don't zero new typeArray during runtime call if the allocation is followed by arraycopy into it.
Reviewed-by: twisti
author | kvn |
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date | Mon, 26 Sep 2011 10:24:05 -0700 |
parents | c124e2e7463e |
children | ec5ce9326985 |
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3960:f08d439fab8c | 3961:a92cdbac8b9e |
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100 | 100 |
101 | 101 |
102 // Compiled code entry points | 102 // Compiled code entry points |
103 address OptoRuntime::_new_instance_Java = NULL; | 103 address OptoRuntime::_new_instance_Java = NULL; |
104 address OptoRuntime::_new_array_Java = NULL; | 104 address OptoRuntime::_new_array_Java = NULL; |
105 address OptoRuntime::_new_array_nozero_Java = NULL; | |
105 address OptoRuntime::_multianewarray2_Java = NULL; | 106 address OptoRuntime::_multianewarray2_Java = NULL; |
106 address OptoRuntime::_multianewarray3_Java = NULL; | 107 address OptoRuntime::_multianewarray3_Java = NULL; |
107 address OptoRuntime::_multianewarray4_Java = NULL; | 108 address OptoRuntime::_multianewarray4_Java = NULL; |
108 address OptoRuntime::_multianewarray5_Java = NULL; | 109 address OptoRuntime::_multianewarray5_Java = NULL; |
109 address OptoRuntime::_multianewarrayN_Java = NULL; | 110 address OptoRuntime::_multianewarrayN_Java = NULL; |
149 // | 150 // |
150 // variable/name type-function-gen , runtime method ,fncy_jp, tls,save_args,retpc | 151 // variable/name type-function-gen , runtime method ,fncy_jp, tls,save_args,retpc |
151 // ------------------------------------------------------------------------------------------------------------------------------- | 152 // ------------------------------------------------------------------------------------------------------------------------------- |
152 gen(env, _new_instance_Java , new_instance_Type , new_instance_C , 0 , true , false, false); | 153 gen(env, _new_instance_Java , new_instance_Type , new_instance_C , 0 , true , false, false); |
153 gen(env, _new_array_Java , new_array_Type , new_array_C , 0 , true , false, false); | 154 gen(env, _new_array_Java , new_array_Type , new_array_C , 0 , true , false, false); |
155 gen(env, _new_array_nozero_Java , new_array_Type , new_array_nozero_C , 0 , true , false, false); | |
154 gen(env, _multianewarray2_Java , multianewarray2_Type , multianewarray2_C , 0 , true , false, false); | 156 gen(env, _multianewarray2_Java , multianewarray2_Type , multianewarray2_C , 0 , true , false, false); |
155 gen(env, _multianewarray3_Java , multianewarray3_Type , multianewarray3_C , 0 , true , false, false); | 157 gen(env, _multianewarray3_Java , multianewarray3_Type , multianewarray3_C , 0 , true , false, false); |
156 gen(env, _multianewarray4_Java , multianewarray4_Type , multianewarray4_C , 0 , true , false, false); | 158 gen(env, _multianewarray4_Java , multianewarray4_Type , multianewarray4_C , 0 , true , false, false); |
157 gen(env, _multianewarray5_Java , multianewarray5_Type , multianewarray5_C , 0 , true , false, false); | 159 gen(env, _multianewarray5_Java , multianewarray5_Type , multianewarray5_C , 0 , true , false, false); |
158 gen(env, _multianewarrayN_Java , multianewarrayN_Type , multianewarrayN_C , 0 , true , false, false); | 160 gen(env, _multianewarrayN_Java , multianewarrayN_Type , multianewarrayN_C , 0 , true , false, false); |
291 // the compiler prefers the array_type, since it must already have | 293 // the compiler prefers the array_type, since it must already have |
292 // that latter value in hand for the fast path. | 294 // that latter value in hand for the fast path. |
293 klassOopDesc* elem_type = objArrayKlass::cast(array_type)->element_klass(); | 295 klassOopDesc* elem_type = objArrayKlass::cast(array_type)->element_klass(); |
294 result = oopFactory::new_objArray(elem_type, len, THREAD); | 296 result = oopFactory::new_objArray(elem_type, len, THREAD); |
295 } | 297 } |
298 | |
299 // Pass oops back through thread local storage. Our apparent type to Java | |
300 // is that we return an oop, but we can block on exit from this routine and | |
301 // a GC can trash the oop in C's return register. The generated stub will | |
302 // fetch the oop from TLS after any possible GC. | |
303 deoptimize_caller_frame(thread, HAS_PENDING_EXCEPTION); | |
304 thread->set_vm_result(result); | |
305 JRT_BLOCK_END; | |
306 | |
307 if (GraphKit::use_ReduceInitialCardMarks()) { | |
308 // inform GC that we won't do card marks for initializing writes. | |
309 new_store_pre_barrier(thread); | |
310 } | |
311 JRT_END | |
312 | |
313 // array allocation without zeroing | |
314 JRT_BLOCK_ENTRY(void, OptoRuntime::new_array_nozero_C(klassOopDesc* array_type, int len, JavaThread *thread)) | |
315 JRT_BLOCK; | |
316 #ifndef PRODUCT | |
317 SharedRuntime::_new_array_ctr++; // new array requires GC | |
318 #endif | |
319 assert(check_compiled_frame(thread), "incorrect caller"); | |
320 | |
321 // Scavenge and allocate an instance. | |
322 oop result; | |
323 | |
324 assert(Klass::cast(array_type)->oop_is_typeArray(), "should be called only for type array"); | |
325 // The oopFactory likes to work with the element type. | |
326 BasicType elem_type = typeArrayKlass::cast(array_type)->element_type(); | |
327 result = oopFactory::new_typeArray_nozero(elem_type, len, THREAD); | |
296 | 328 |
297 // Pass oops back through thread local storage. Our apparent type to Java | 329 // Pass oops back through thread local storage. Our apparent type to Java |
298 // is that we return an oop, but we can block on exit from this routine and | 330 // is that we return an oop, but we can block on exit from this routine and |
299 // a GC can trash the oop in C's return register. The generated stub will | 331 // a GC can trash the oop in C's return register. The generated stub will |
300 // fetch the oop from TLS after any possible GC. | 332 // fetch the oop from TLS after any possible GC. |