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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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977 // r0 - holds the untagged key on entry and holds the hash once computed. | 977 // r0 - holds the untagged key on entry and holds the hash once computed. |
978 // | 978 // |
979 // r1 - used to hold the capacity mask of the dictionary | 979 // r1 - used to hold the capacity mask of the dictionary |
980 // | 980 // |
981 // r2 - used for the index into the dictionary. | 981 // r2 - used for the index into the dictionary. |
982 // | 982 // |
983 // result - holds the result on exit if the load succeeds and we fall through. | 983 // result - holds the result on exit if the load succeeds and we fall through. |
984 | 984 |
985 Label done; | 985 Label done; |
986 | 986 |
987 // First of all lets assign to r1 value of HashSeed | |
988 if (Serializer::enabled()) { | |
989 ExternalReference roots_array_start = | |
990 ExternalReference::roots_array_start(isolate()); | |
991 mov(r1, Immediate(Heap::kStringHashSeedRootIndex)); | |
992 mov(r1, Operand::StaticArray(r1, | |
993 times_pointer_size, | |
994 roots_array_start)); | |
995 } else { | |
996 int32_t seed = isolate()->heap()->StringHashSeed(); | |
997 lea(r1, Operand(seed, RelocInfo::NONE)); | |
Erik Corry
2012/01/09 23:52:48
No reason to use lea here when mov would do.
| |
998 } | |
999 | |
1000 // Xor original key with a seed | |
1001 xor_(r1, r0); | |
1002 | |
987 // Compute the hash code from the untagged key. This must be kept in sync | 1003 // Compute the hash code from the untagged key. This must be kept in sync |
988 // with ComputeIntegerHash in utils.h. | 1004 // with ComputeIntegerHash in utils.h. |
989 // | 1005 // |
990 // hash = ~hash + (hash << 15); | 1006 // hash = ~hash + (hash << 15); |
991 mov(r1, r0); | |
992 not_(r0); | 1007 not_(r0); |
993 shl(r1, 15); | 1008 shl(r1, 15); |
994 add(r0, r1); | 1009 add(r0, r1); |
995 // hash = hash ^ (hash >> 12); | 1010 // hash = hash ^ (hash >> 12); |
996 mov(r1, r0); | 1011 mov(r1, r0); |
997 shr(r1, 12); | 1012 shr(r1, 12); |
998 xor_(r0, r1); | 1013 xor_(r0, r1); |
999 // hash = hash + (hash << 2); | 1014 // hash = hash + (hash << 2); |
1000 lea(r0, Operand(r0, r0, times_4, 0)); | 1015 lea(r0, Operand(r0, r0, times_4, 0)); |
1001 // hash = hash ^ (hash >> 4); | 1016 // hash = hash ^ (hash >> 4); |
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2685 cmp(length, Operand(bitmap_scratch, MemoryChunk::kSizeOffset)); | 2700 cmp(length, Operand(bitmap_scratch, MemoryChunk::kSizeOffset)); |
2686 Check(less_equal, "Live Bytes Count overflow chunk size"); | 2701 Check(less_equal, "Live Bytes Count overflow chunk size"); |
2687 } | 2702 } |
2688 | 2703 |
2689 bind(&done); | 2704 bind(&done); |
2690 } | 2705 } |
2691 | 2706 |
2692 } } // namespace v8::internal | 2707 } } // namespace v8::internal |
2693 | 2708 |
2694 #endif // V8_TARGET_ARCH_IA32 | 2709 #endif // V8_TARGET_ARCH_IA32 |
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