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| ID | Category | Severity | Reproducibility | Date Submitted | Last Update | ||||
| 0003568 | [Squeak] Kernel | minor | always | 05-07-06 16:30 | 09-01-08 18:27 | ||||
| Reporter | nicolas cellier | View Status | public | ||||||
| Assigned To | |||||||||
| Priority | normal | Resolution | fixed | ||||||
| Status | closed | Product Version | 3.9 | ||||||
| Summary | 0003568: [FIX] Fraction>>asFloat does not answer nearest floating point number | ||||||||
| Description |
Current implementation can accumulate round off errors. Comment states that ideally, it should answer nearest floating point number... I join a test and a patch for this, and round to nearest even according to IEEE 754 default rounding mode. Patch http://bugs.impara.de/view.php?id=3564 [^] concerning Integer>>asFloat should be applied first, so this one can work correctly. |
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| Additional Information |
Fraction need not being reduced for this algorithm to apply. So, the new asFloat algorithm can be used to convert decimal representations to binary representations (Number readFrom: ), without spending too much time in gcd algorithm... |
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| Attached Files |
 Kernel-Number-Fraction-asFloat-Test.1.cs [^] (878 bytes) 05-07-06 17:08 Kernel-Number-Fraction-asFloat-Patch.2.cs [^] (1,852 bytes) 05-07-06 17:09 Kernel-Number-Fraction-asFloat-Patch.3.cs [^] (1,877 bytes) 01-10-07 05:33 Kernel-Number-Fraction-asFloat-Test.2.cs [^] (1,441 bytes) 01-10-07 05:40 |
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Notes |
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(0005628 - 10 - 10 - 10 - 10 - 10 - 10) ducasse 07-08-06 18:01 |
in 39 7038 |
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(0008859 - 270 - 348 - 348 - 348 - 348 - 348) nicolas cellier 01-10-07 05:25 |
Unfortunately, the fix is wrong in one case... "test round to nearest even" self assert: ((1<<52)+0+(1/2)) asFloat asTrueFraction = ((1<<52)+0). This was discovered by discussion with Chris Uppal on Dolphin mailing list... I will send new patch and new tests |
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(0008861 - 189 - 243 - 243 - 243 - 243 - 243) nicolas cellier 01-10-07 05:44 |
"fix begin" Installer mantis bug: 3568 fix: 'Kernel-Number-Fraction-asFloat-Patch.3.cs'. "fix test" Installer mantis bug: 3568 fix: 'Kernel-Number-Fraction-asFloat-Test.2.cs'. "fix end" |
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(0010486 - 83 - 89 - 89 - 89 - 89 - 89) edgardec 04-01-07 13:29 |
This now is 7074fix-asFloatanswers.cs and was in updates for 3.10 Thanks Nicolas ! |
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(0012569 - 50 - 50 - 50 - 50 - 50 - 50) KenCausey 09-01-08 18:27 |
Harvested as update 7074 and released in 3.10-7159 |
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Issue History |
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| Date Modified | Username | Field | Change |
| 05-07-06 16:30 | nicolas cellier | New Issue | |
| 05-07-06 17:08 | nicolas cellier | File Added: Kernel-Number-Fraction-asFloat-Test.1.cs | |
| 05-07-06 17:09 | nicolas cellier | File Added: Kernel-Number-Fraction-asFloat-Patch.2.cs | |
| 07-04-06 15:40 | lewis | Issue Monitored: lewis | |
| 07-08-06 18:01 | ducasse | Status | new => closed |
| 07-08-06 18:01 | ducasse | Note Added: 0005628 | |
| 07-08-06 18:01 | ducasse | Resolution | open => fixed |
| 01-10-07 05:25 | nicolas cellier | Status | closed => feedback |
| 01-10-07 05:25 | nicolas cellier | Resolution | fixed => reopened |
| 01-10-07 05:25 | nicolas cellier | Note Added: 0008859 | |
| 01-10-07 05:33 | nicolas cellier | File Added: Kernel-Number-Fraction-asFloat-Patch.3.cs | |
| 01-10-07 05:40 | nicolas cellier | File Added: Kernel-Number-Fraction-asFloat-Test.2.cs | |
| 01-10-07 05:44 | nicolas cellier | Note Added: 0008861 | |
| 04-01-07 13:29 | edgardec | Note Added: 0010486 | |
| 09-01-08 18:27 | KenCausey | Status | feedback => closed |
| 09-01-08 18:27 | KenCausey | Note Added: 0012569 | |
| 09-01-08 18:27 | KenCausey | Resolution | reopened => fixed |
| 09-01-08 18:27 | KenCausey | Fixed in Version | => 3.10 |
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