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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_MIPS | 7 #if V8_TARGET_ARCH_MIPS |
| 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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| 3154 // StringCharFromCodeGenerator | 3154 // StringCharFromCodeGenerator |
| 3155 | 3155 |
| 3156 void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) { | 3156 void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) { |
| 3157 // Fast case of Heap::LookupSingleCharacterStringFromCode. | 3157 // Fast case of Heap::LookupSingleCharacterStringFromCode. |
| 3158 | 3158 |
| 3159 DCHECK(!t0.is(result_)); | 3159 DCHECK(!t0.is(result_)); |
| 3160 DCHECK(!t0.is(code_)); | 3160 DCHECK(!t0.is(code_)); |
| 3161 | 3161 |
| 3162 STATIC_ASSERT(kSmiTag == 0); | 3162 STATIC_ASSERT(kSmiTag == 0); |
| 3163 STATIC_ASSERT(kSmiShiftSize == 0); | 3163 STATIC_ASSERT(kSmiShiftSize == 0); |
| 3164 DCHECK(base::bits::IsPowerOfTwo32(String::kMaxOneByteCharCode + 1)); | 3164 DCHECK(base::bits::IsPowerOfTwo32(String::kMaxOneByteCharCodeU + 1)); |
| 3165 __ And(t0, | 3165 __ And(t0, code_, Operand(kSmiTagMask | |
| 3166 code_, | 3166 ((~String::kMaxOneByteCharCodeU) << kSmiTagSize))); |
| 3167 Operand(kSmiTagMask | | |
| 3168 ((~String::kMaxOneByteCharCode) << kSmiTagSize))); | |
| 3169 __ Branch(&slow_case_, ne, t0, Operand(zero_reg)); | 3167 __ Branch(&slow_case_, ne, t0, Operand(zero_reg)); |
| 3170 | 3168 |
| 3171 __ LoadRoot(result_, Heap::kSingleCharacterStringCacheRootIndex); | 3169 __ LoadRoot(result_, Heap::kSingleCharacterStringCacheRootIndex); |
| 3172 // At this point code register contains smi tagged one-byte char code. | 3170 // At this point code register contains smi tagged one-byte char code. |
| 3173 STATIC_ASSERT(kSmiTag == 0); | 3171 STATIC_ASSERT(kSmiTag == 0); |
| 3174 __ sll(t0, code_, kPointerSizeLog2 - kSmiTagSize); | 3172 __ sll(t0, code_, kPointerSizeLog2 - kSmiTagSize); |
| 3175 __ Addu(result_, result_, t0); | 3173 __ Addu(result_, result_, t0); |
| 3176 __ lw(result_, FieldMemOperand(result_, FixedArray::kHeaderSize)); | 3174 __ lw(result_, FieldMemOperand(result_, FixedArray::kHeaderSize)); |
| 3177 __ LoadRoot(t0, Heap::kUndefinedValueRootIndex); | 3175 __ LoadRoot(t0, Heap::kUndefinedValueRootIndex); |
| 3178 __ Branch(&slow_case_, eq, result_, Operand(t0)); | 3176 __ Branch(&slow_case_, eq, result_, Operand(t0)); |
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| 5574 MemOperand(fp, 6 * kPointerSize), NULL); | 5572 MemOperand(fp, 6 * kPointerSize), NULL); |
| 5575 } | 5573 } |
| 5576 | 5574 |
| 5577 | 5575 |
| 5578 #undef __ | 5576 #undef __ |
| 5579 | 5577 |
| 5580 } // namespace internal | 5578 } // namespace internal |
| 5581 } // namespace v8 | 5579 } // namespace v8 |
| 5582 | 5580 |
| 5583 #endif // V8_TARGET_ARCH_MIPS | 5581 #endif // V8_TARGET_ARCH_MIPS |
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