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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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6677 | 6677 |
6678 __ bind(&non_ascii); | 6678 __ bind(&non_ascii); |
6679 // At least one of the strings is two-byte. Check whether it happens | 6679 // At least one of the strings is two-byte. Check whether it happens |
6680 // to contain only ASCII characters. | 6680 // to contain only ASCII characters. |
6681 // t0: first instance type. | 6681 // t0: first instance type. |
6682 // t1: second instance type. | 6682 // t1: second instance type. |
6683 // Branch to if _both_ instances have kAsciiDataHintMask set. | 6683 // Branch to if _both_ instances have kAsciiDataHintMask set. |
6684 __ And(at, t0, Operand(kAsciiDataHintMask)); | 6684 __ And(at, t0, Operand(kAsciiDataHintMask)); |
6685 __ and_(at, at, t1); | 6685 __ and_(at, at, t1); |
6686 __ Branch(&ascii_data, ne, at, Operand(zero_reg)); | 6686 __ Branch(&ascii_data, ne, at, Operand(zero_reg)); |
| 6687 __ Xor(t0, t0, Operand(t1)); |
| 6688 STATIC_ASSERT(kOneByteStringTag != 0 && kAsciiDataHintTag != 0); |
| 6689 __ And(t0, t0, Operand(kOneByteStringTag | kAsciiDataHintTag)); |
| 6690 __ Branch(&ascii_data, eq, t0, |
| 6691 Operand(kOneByteStringTag | kAsciiDataHintTag)); |
6687 | 6692 |
6688 // Allocate a two byte cons string. | 6693 // Allocate a two byte cons string. |
6689 __ AllocateTwoByteConsString(v0, t2, t0, t1, &call_runtime); | 6694 __ AllocateTwoByteConsString(v0, t2, t0, t1, &call_runtime); |
6690 __ Branch(&allocated); | 6695 __ Branch(&allocated); |
6691 | 6696 |
6692 // We cannot encounter sliced strings or cons strings here since: | 6697 // We cannot encounter sliced strings or cons strings here since: |
6693 STATIC_ASSERT(SlicedString::kMinLength >= ConsString::kMinLength); | 6698 STATIC_ASSERT(SlicedString::kMinLength >= ConsString::kMinLength); |
6694 // Handle creating a flat result from either external or sequential strings. | 6699 // Handle creating a flat result from either external or sequential strings. |
6695 // Locate the first characters' locations. | 6700 // Locate the first characters' locations. |
6696 // a0: first string | 6701 // a0: first string |
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7869 __ Pop(ra, t1, a1); | 7874 __ Pop(ra, t1, a1); |
7870 __ Ret(); | 7875 __ Ret(); |
7871 } | 7876 } |
7872 | 7877 |
7873 | 7878 |
7874 #undef __ | 7879 #undef __ |
7875 | 7880 |
7876 } } // namespace v8::internal | 7881 } } // namespace v8::internal |
7877 | 7882 |
7878 #endif // V8_TARGET_ARCH_MIPS | 7883 #endif // V8_TARGET_ARCH_MIPS |
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