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Issue 544613002: Remove dead code for inline string hashing. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 6 years, 3 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 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "src/v8.h" 5 #include "src/v8.h"
6 6
7 #if V8_TARGET_ARCH_ARM 7 #if V8_TARGET_ARCH_ARM
8 8
9 #include "src/base/bits.h" 9 #include "src/base/bits.h"
10 #include "src/bootstrapper.h" 10 #include "src/bootstrapper.h"
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2912 __ ldrb(scratch, MemOperand(src, 1, PostIndex), lt); 2912 __ ldrb(scratch, MemOperand(src, 1, PostIndex), lt);
2913 __ strb(scratch, MemOperand(dest, 1, PostIndex)); 2913 __ strb(scratch, MemOperand(dest, 1, PostIndex));
2914 __ bind(&loop_entry); 2914 __ bind(&loop_entry);
2915 __ cmp(dest, Operand(limit)); 2915 __ cmp(dest, Operand(limit));
2916 __ b(lt, &loop); 2916 __ b(lt, &loop);
2917 2917
2918 __ bind(&done); 2918 __ bind(&done);
2919 } 2919 }
2920 2920
2921 2921
2922 void StringHelper::GenerateHashInit(MacroAssembler* masm,
2923 Register hash,
2924 Register character) {
2925 // hash = character + (character << 10);
2926 __ LoadRoot(hash, Heap::kHashSeedRootIndex);
2927 // Untag smi seed and add the character.
2928 __ add(hash, character, Operand(hash, LSR, kSmiTagSize));
2929 // hash += hash << 10;
2930 __ add(hash, hash, Operand(hash, LSL, 10));
2931 // hash ^= hash >> 6;
2932 __ eor(hash, hash, Operand(hash, LSR, 6));
2933 }
2934
2935
2936 void StringHelper::GenerateHashAddCharacter(MacroAssembler* masm,
2937 Register hash,
2938 Register character) {
2939 // hash += character;
2940 __ add(hash, hash, Operand(character));
2941 // hash += hash << 10;
2942 __ add(hash, hash, Operand(hash, LSL, 10));
2943 // hash ^= hash >> 6;
2944 __ eor(hash, hash, Operand(hash, LSR, 6));
2945 }
2946
2947
2948 void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
2949 Register hash) {
2950 // hash += hash << 3;
2951 __ add(hash, hash, Operand(hash, LSL, 3));
2952 // hash ^= hash >> 11;
2953 __ eor(hash, hash, Operand(hash, LSR, 11));
2954 // hash += hash << 15;
2955 __ add(hash, hash, Operand(hash, LSL, 15));
2956
2957 __ and_(hash, hash, Operand(String::kHashBitMask), SetCC);
2958
2959 // if (hash == 0) hash = 27;
2960 __ mov(hash, Operand(StringHasher::kZeroHash), LeaveCC, eq);
2961 }
2962
2963
2964 void SubStringStub::Generate(MacroAssembler* masm) { 2922 void SubStringStub::Generate(MacroAssembler* masm) {
2965 Label runtime; 2923 Label runtime;
2966 2924
2967 // Stack frame on entry. 2925 // Stack frame on entry.
2968 // lr: return address 2926 // lr: return address
2969 // sp[0]: to 2927 // sp[0]: to
2970 // sp[4]: from 2928 // sp[4]: from
2971 // sp[8]: string 2929 // sp[8]: string
2972 2930
2973 // This stub is called from the native-call %_SubString(...), so 2931 // This stub is called from the native-call %_SubString(...), so
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4721 MemOperand(fp, 6 * kPointerSize), 4679 MemOperand(fp, 6 * kPointerSize),
4722 NULL); 4680 NULL);
4723 } 4681 }
4724 4682
4725 4683
4726 #undef __ 4684 #undef __
4727 4685
4728 } } // namespace v8::internal 4686 } } // namespace v8::internal
4729 4687
4730 #endif // V8_TARGET_ARCH_ARM 4688 #endif // V8_TARGET_ARCH_ARM
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