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Issue 169713002: Revert "Add a premonomorphic state to the call target cache." (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 6 years, 10 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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2355 // Load the global or builtins object from the current context 2355 // Load the global or builtins object from the current context
2356 __ LoadGlobalContext(ecx); 2356 __ LoadGlobalContext(ecx);
2357 // Make sure the function is the Array() function 2357 // Make sure the function is the Array() function
2358 __ cmp(edi, Operand(ecx, 2358 __ cmp(edi, Operand(ecx,
2359 Context::SlotOffset(Context::ARRAY_FUNCTION_INDEX))); 2359 Context::SlotOffset(Context::ARRAY_FUNCTION_INDEX)));
2360 __ j(not_equal, &megamorphic); 2360 __ j(not_equal, &megamorphic);
2361 __ jmp(&done, Label::kFar); 2361 __ jmp(&done, Label::kFar);
2362 2362
2363 __ bind(&miss); 2363 __ bind(&miss);
2364 2364
2365 // A monomorphic miss (i.e, here the cache is not uninitialized or 2365 // A monomorphic miss (i.e, here the cache is not uninitialized) goes
2366 // pre-monomorphic) goes megamorphic. 2366 // megamorphic.
2367 Label not_uninitialized;
2368 __ cmp(ecx, Immediate(TypeFeedbackInfo::UninitializedSentinel(isolate))); 2367 __ cmp(ecx, Immediate(TypeFeedbackInfo::UninitializedSentinel(isolate)));
2369 __ j(not_equal, &not_uninitialized);
2370
2371 // PremonomorphicSentinel is an immortal immovable object (null) so no
2372 // write-barrier is needed.
2373 __ mov(FieldOperand(ebx, edx, times_half_pointer_size,
2374 FixedArray::kHeaderSize),
2375 Immediate(TypeFeedbackInfo::PremonomorphicSentinel(isolate)));
2376 __ jmp(&done, Label::kFar);
2377
2378 // If the cache isn't uninitialized, it is either premonomorphic or
2379 // monomorphic. If it is premonomorphic, we initialize it thus making
2380 // it monomorphic. Otherwise, we go megamorphic.
2381 __ bind(&not_uninitialized);
2382 __ cmp(ecx, Immediate(TypeFeedbackInfo::PremonomorphicSentinel(isolate)));
2383 __ j(equal, &initialize); 2368 __ j(equal, &initialize);
2384
2385 // MegamorphicSentinel is an immortal immovable object (undefined) so no 2369 // MegamorphicSentinel is an immortal immovable object (undefined) so no
2386 // write-barrier is needed. 2370 // write-barrier is needed.
2387 __ bind(&megamorphic); 2371 __ bind(&megamorphic);
2388 __ mov(FieldOperand(ebx, edx, times_half_pointer_size, 2372 __ mov(FieldOperand(ebx, edx, times_half_pointer_size,
2389 FixedArray::kHeaderSize), 2373 FixedArray::kHeaderSize),
2390 Immediate(TypeFeedbackInfo::MegamorphicSentinel(isolate))); 2374 Immediate(TypeFeedbackInfo::MegamorphicSentinel(isolate)));
2391 __ jmp(&done, Label::kFar); 2375 __ jmp(&done, Label::kFar);
2392 2376
2393 // An uninitialized cache is patched with the function or sentinel to 2377 // An uninitialized cache is patched with the function or sentinel to
2394 // indicate the ElementsKind if function is the Array constructor. 2378 // indicate the ElementsKind if function is the Array constructor.
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5474 Operand(ebp, 7 * kPointerSize), 5458 Operand(ebp, 7 * kPointerSize),
5475 NULL); 5459 NULL);
5476 } 5460 }
5477 5461
5478 5462
5479 #undef __ 5463 #undef __
5480 5464
5481 } } // namespace v8::internal 5465 } } // namespace v8::internal
5482 5466
5483 #endif // V8_TARGET_ARCH_IA32 5467 #endif // V8_TARGET_ARCH_IA32
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