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1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2010 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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642 // dest. If the HeapNumber does not fit into a 32bits signed integer branch | 642 // dest. If the HeapNumber does not fit into a 32bits signed integer branch |
643 // to not_int32 label. If VFP3 is available double_scratch is used but not | 643 // to not_int32 label. If VFP3 is available double_scratch is used but not |
644 // scratch2. | 644 // scratch2. |
645 void ConvertToInt32(Register source, | 645 void ConvertToInt32(Register source, |
646 Register dest, | 646 Register dest, |
647 Register scratch, | 647 Register scratch, |
648 Register scratch2, | 648 Register scratch2, |
649 DwVfpRegister double_scratch, | 649 DwVfpRegister double_scratch, |
650 Label *not_int32); | 650 Label *not_int32); |
651 | 651 |
652 // Truncates a double using a specific rounding mode. | 652 // Truncates a double using a specific rounding mode. |
653 // Clears the z flag (ne condition) if an overflow occurs. | 653 // Clears the z flag (ne condition) if an overflow occurs. |
654 // If exact_conversion is true, the z flag is also cleared if the conversion | 654 // If exact_conversion is true, the z flag is also cleared if the conversion |
655 // was inexact, ie. if the double value could not be converted exactly | 655 // was inexact, ie. if the double value could not be converted exactly |
656 // to a 32bit integer. | 656 // to a 32bit integer. |
657 void EmitVFPTruncate(VFPRoundingMode rounding_mode, | 657 void EmitVFPTruncate(VFPRoundingMode rounding_mode, |
658 SwVfpRegister result, | 658 SwVfpRegister result, |
659 DwVfpRegister double_input, | 659 DwVfpRegister double_input, |
660 Register scratch1, | 660 Register scratch1, |
661 Register scratch2, | 661 Register scratch2, |
662 CheckForInexactConversion check | 662 CheckForInexactConversion check |
663 = kDontCheckForInexactConversion); | 663 = kDontCheckForInexactConversion); |
664 | 664 |
| 665 // Helper for EmitECMATruncate. |
| 666 // This will truncate a floating-point value outside of the singed 32bit |
| 667 // integer range to a 32bit signed integer. |
| 668 // Expects the double value loaded in input_high and input_low. |
| 669 // Exits with the answer in 'result'. |
| 670 // Note that this code does not work for values in the 32bit range! |
| 671 void EmitOutOfInt32RangeTruncate(Register result, |
| 672 Register input_high, |
| 673 Register input_low, |
| 674 Register scratch); |
| 675 |
| 676 // Performs a truncating conversion of a floating point number as used by |
| 677 // the JS bitwise operations. See ECMA-262 9.5: ToInt32. |
| 678 // Exits with 'result' holding the answer and all other registers clobbered. |
| 679 void EmitECMATruncate(Register result, |
| 680 DwVfpRegister double_input, |
| 681 SwVfpRegister single_scratch, |
| 682 Register scratch, |
| 683 Register scratch2, |
| 684 Register scratch3); |
| 685 |
665 // Count leading zeros in a 32 bit word. On ARM5 and later it uses the clz | 686 // Count leading zeros in a 32 bit word. On ARM5 and later it uses the clz |
666 // instruction. On pre-ARM5 hardware this routine gives the wrong answer | 687 // instruction. On pre-ARM5 hardware this routine gives the wrong answer |
667 // for 0 (31 instead of 32). Source and scratch can be the same in which case | 688 // for 0 (31 instead of 32). Source and scratch can be the same in which case |
668 // the source is clobbered. Source and zeros can also be the same in which | 689 // the source is clobbered. Source and zeros can also be the same in which |
669 // case scratch should be a different register. | 690 // case scratch should be a different register. |
670 void CountLeadingZeros(Register zeros, | 691 void CountLeadingZeros(Register zeros, |
671 Register source, | 692 Register source, |
672 Register scratch); | 693 Register scratch); |
673 | 694 |
674 // --------------------------------------------------------------------------- | 695 // --------------------------------------------------------------------------- |
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1019 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__) | 1040 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__) |
1020 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm-> | 1041 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm-> |
1021 #else | 1042 #else |
1022 #define ACCESS_MASM(masm) masm-> | 1043 #define ACCESS_MASM(masm) masm-> |
1023 #endif | 1044 #endif |
1024 | 1045 |
1025 | 1046 |
1026 } } // namespace v8::internal | 1047 } } // namespace v8::internal |
1027 | 1048 |
1028 #endif // V8_ARM_MACRO_ASSEMBLER_ARM_H_ | 1049 #endif // V8_ARM_MACRO_ASSEMBLER_ARM_H_ |
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