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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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| 725 __ movzx_w(result, Operand(result, index, times_2, 0)); | 725 __ movzx_w(result, Operand(result, index, times_2, 0)); |
| 726 __ jmp(&done, Label::kNear); | 726 __ jmp(&done, Label::kNear); |
| 727 __ bind(&ascii_external); | 727 __ bind(&ascii_external); |
| 728 // Ascii string. | 728 // Ascii string. |
| 729 __ movzx_b(result, Operand(result, index, times_1, 0)); | 729 __ movzx_b(result, Operand(result, index, times_1, 0)); |
| 730 __ jmp(&done, Label::kNear); | 730 __ jmp(&done, Label::kNear); |
| 731 | 731 |
| 732 // Dispatch on the encoding: ASCII or two-byte. | 732 // Dispatch on the encoding: ASCII or two-byte. |
| 733 Label ascii; | 733 Label ascii; |
| 734 __ bind(&seq_string); | 734 __ bind(&seq_string); |
| 735 STATIC_ASSERT((kStringEncodingMask & kAsciiStringTag) != 0); | 735 STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0); |
| 736 STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0); | 736 STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0); |
| 737 __ test(result, Immediate(kStringEncodingMask)); | 737 __ test(result, Immediate(kStringEncodingMask)); |
| 738 __ j(not_zero, &ascii, Label::kNear); | 738 __ j(not_zero, &ascii, Label::kNear); |
| 739 | 739 |
| 740 // Two-byte string. | 740 // Two-byte string. |
| 741 // Load the two-byte character code into the result register. | 741 // Load the two-byte character code into the result register. |
| 742 __ movzx_w(result, FieldOperand(string, | 742 __ movzx_w(result, FieldOperand(string, |
| 743 index, | 743 index, |
| 744 times_2, | 744 times_2, |
| 745 SeqTwoByteString::kHeaderSize)); | 745 SeqTwoByteString::kHeaderSize)); |
| 746 __ jmp(&done, Label::kNear); | 746 __ jmp(&done, Label::kNear); |
| 747 | 747 |
| 748 // Ascii string. | 748 // Ascii string. |
| 749 // Load the byte into the result register. | 749 // Load the byte into the result register. |
| 750 __ bind(&ascii); | 750 __ bind(&ascii); |
| 751 __ movzx_b(result, FieldOperand(string, | 751 __ movzx_b(result, FieldOperand(string, |
| 752 index, | 752 index, |
| 753 times_1, | 753 times_1, |
| 754 SeqAsciiString::kHeaderSize)); | 754 SeqAsciiString::kHeaderSize)); |
| 755 __ bind(&done); | 755 __ bind(&done); |
| 756 } | 756 } |
| 757 | 757 |
| 758 #undef __ | 758 #undef __ |
| 759 | 759 |
| 760 } } // namespace v8::internal | 760 } } // namespace v8::internal |
| 761 | 761 |
| 762 #endif // V8_TARGET_ARCH_IA32 | 762 #endif // V8_TARGET_ARCH_IA32 |
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